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  • How to use multiple dns?

    - by Enrichman
    When I connect at work the net is going to assign me a dns that is working fine. After that when I connect to VPN I'm going to receive a different dns. With this one I can reach the server of the vpn owner but I'm not able to go to the internet. BUT if I switch the dns with the old ones I'm able to surf again (still connected to the vpn, but I cannot surf their server). Recap: DNS1) MyPC - CompanyProxy - Internet DNS2) MyPc - CompanyProxy - VPN - NoInternet (can Ping vpn servers) DNS1) MyPC - CompanyProxy - VPN - Internet (cannot ping vpn servers) Weirdest thing: I'm able to do a nslookup from anywhere, but ping is going to fail. Is possible to use both DNS? Or setup a dns just on the browser? I'm quite lost..

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  • Setting up a domain with a dedicated server

    - by Andrew M
    I have a dedicated server with a bunch of stuff on it already. Basically, I am accessing it now with the free domain I got when I purchased the server (http://example.com/directory, etc). I also have a second domain I want to use with a specific subdirectory (http://exampletwo.com/ should basically work as if I were under http://example.com/two, but it should use the exampletwo domain. I would assume I would change the A record of the second domain to the IP of the server, but how do I make it work with a subdirectory? I have full DNS control of the second domain but it is purchased on from a different registrar than the dedicated server. EDIT: It is a CentOS 5 server running Plesk/Virtuozoo.

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  • SQL SERVER – Quick Look at SQL Server Configuration for Performance Indications

    - by pinaldave
    Earlier I wrote SQL SERVER – Beginning SQL Server: One Step at a Time – SQL Server Magazine. That was the first article on the series of my real world experience of Performance Tuning experience. I have written second part the same series over here. Read second part over here: Quick Look at SQL Server Configuration for Performance Indications. In this second part I talk about two types of my clients. 1) Those who want instant results 2) Those who want the right results It is really fun to work with both the clients. I talk about various configuration options which I look at when I try to give very early opinion about SQL Server Performance. There are various eight configurations, I give quick look and start talking about performance. Head over to original article over here: Quick Look at SQL Server Configuration for Performance Indications. Reference : Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, PostADay, SQL, SQL Authority, SQL Optimization, SQL Performance, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • SQL SERVER – Service Broker and CAP_CPU_PERCENT – Limiting SQL Server Instances to CPU Usage

    - by pinaldave
    I have mentioned several times on this blog that the best part of blogging is the questions I receive from readers. They are often very interesting. The questions from readers give me a good idea what other readers might be thinking as well. After reading my earlier article Simple Example to Configure Resource Governor – Introduction to Resource Governor – I received an email from a reader and we exchanged a few emails. After exchanging emails we both figured out what is going on. It was indeed interesting and reader suggested to that I should blog about it.  I asked for permission to publish his name but he does not like the attention so we will just call him Jeff. I have converted our emails into chat for easy consumption. Jeff: Your script does not work at all. I think either there is a bug in SQL Server. Pinal: Would you please explain in detail? Jeff: Your code does not limit the CPU usage? Pinal: How did you measure it? Jeff: Well, we have third party tools for it but let us say I have limited the resources for Reporting Services and used your script described in your blog. After that I ran only reporting service workload the CPU is still used more than 100% and it is not limited to 30% as described in your script. Clearly something is wrong somewhere. Pinal: Did you say you ONLY ran reporting server load? Jeff: Yeah, to validate I ran ONLY reporting server load and CPU did not throttle at 30% as per your script. Pinal: Oh! I get it here is the answer - CAP_CPU_PERCENT = 30. Use it. Jeff: What is that, I think your earlier script says it will throttle the Reporting Service workload and Application/OLTP workload and balance it. Pinal: Exactly, that is correct. Jeff: You need to write more in email buddy! Just like your blogs, your answers do not make sense! No Offense! Pinal: Hmm…feedback well taken. Let me try again. In SQL Server 2012 there are a few enhancements with regards to SQL Server Resource Governor. One of the enhancement is how the resources are allocated. Let me explain you with examples. Configuration: [Read Earlier Post] Reporting Workload: MIN_CPU_PERCENT=0, MAX_CPU_PERCENT=30 Application/OLTP Workload: MIN_CPU_PERCENT=50, MAX_CPU_PERCENT=100 Example 1: If there is only Reporting Workload on the server: SQL Server will not limit usage of CPU to only 30% workload but SQL Server instance will use all available CPU (if needed). In another word in this scenario it will use more than 30% CPU. Example 2: If there is Reproting Workload and heavy Application/OLTP workload: SQL Server will allocate a maximum of 30% CPU resources to Reporting Workload and allocate remaining resources to heavy application/OLTP workload. The reason for this enhancement is for better utilization of the resources. Let us think, if there is only single workload, which we have limited to max CPU usage to 30%. The other unused available CPU resources is now wasted. In this situation SQL Server allows the workload to use more than 30% resources leading to overall improved/optimized performance. However, in the case of multiple workload where lots of resources are needed the limits specified in MAX_CPU_PERCENT are acknowledged. Example 3: If there is a situation where the max CPU workload has to be enforced: This is a very interesting scenario, in the case when the max CPU workload has to be enforced irrespective of the workload and enhanced algorithm, the keyword CAP_CPU_PERCENT is essential. It specifies a hard cap on the CPU bandwidth that all requests in the resource pool will receive. It will never let CPU usage for reporting workload to go over 30% in our case. You can use the key word as follows: -- Creating Resource Pool for Report Server CREATE RESOURCE POOL ReportServerPool WITH ( MIN_CPU_PERCENT=0, MAX_CPU_PERCENT=30, CAP_CPU_PERCENT=40, MIN_MEMORY_PERCENT=0, MAX_MEMORY_PERCENT=30) GO Notice that there is MAX_CPU_PERCENT=30 and CAP_CPU_PERCENT=40, what it means is that when SQL Server Instance is under heavy load under different workload it will use the maximum CPU at 30%. However, when the SQL Server instance is not under workload it will go over the 30% limit. However, as CAP_CPU_PERCENT is set to 40, it will not go over 40% in any case by limiting the usage of CPU. CAP_CPU_PERCENT puts a hard limit on the resources usage by workload. Jeff: Nice Pinal, you should blog about it. [A day passes by] Pinal: Jeff, it is done! Click here to read it. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology Tagged: Service Broker

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  • SQL SERVER – Beginning of SQL Server Architecture – Terminology – Guest Post

    - by pinaldave
    SQL Server Architecture is a very deep subject. Covering it in a single post is an almost impossible task. However, this subject is very popular topic among beginners and advanced users.  I have requested my friend Anil Kumar who is expert in SQL Domain to help me write  a simple post about Beginning SQL Server Architecture. As stated earlier this subject is very deep subject and in this first article series he has covered basic terminologies. In future article he will explore the subject further down. Anil Kumar Yadav is Trainer, SQL Domain, Koenig Solutions. Koenig is a premier IT training firm that provides several IT certifications, such as Oracle 11g, Server+, RHCA, SQL Server Training, Prince2 Foundation etc. In this Article we will discuss about MS SQL Server architecture. The major components of SQL Server are: Relational Engine Storage Engine SQL OS Now we will discuss and understand each one of them. 1) Relational Engine: Also called as the query processor, Relational Engine includes the components of SQL Server that determine what your query exactly needs to do and the best way to do it. It manages the execution of queries as it requests data from the storage engine and processes the results returned. Different Tasks of Relational Engine: Query Processing Memory Management Thread and Task Management Buffer Management Distributed Query Processing 2) Storage Engine: Storage Engine is responsible for storage and retrieval of the data on to the storage system (Disk, SAN etc.). to understand more, let’s focus on the following diagram. When we talk about any database in SQL server, there are 2 types of files that are created at the disk level – Data file and Log file. Data file physically stores the data in data pages. Log files that are also known as write ahead logs, are used for storing transactions performed on the database. Let’s understand data file and log file in more details: Data File: Data File stores data in the form of Data Page (8KB) and these data pages are logically organized in extents. Extents: Extents are logical units in the database. They are a combination of 8 data pages i.e. 64 KB forms an extent. Extents can be of two types, Mixed and Uniform. Mixed extents hold different types of pages like index, System, Object data etc. On the other hand, Uniform extents are dedicated to only one type. Pages: As we should know what type of data pages can be stored in SQL Server, below mentioned are some of them: Data Page: It holds the data entered by the user but not the data which is of type text, ntext, nvarchar(max), varchar(max), varbinary(max), image and xml data. Index: It stores the index entries. Text/Image: It stores LOB ( Large Object data) like text, ntext, varchar(max), nvarchar(max),  varbinary(max), image and xml data. GAM & SGAM (Global Allocation Map & Shared Global Allocation Map): They are used for saving information related to the allocation of extents. PFS (Page Free Space): Information related to page allocation and unused space available on pages. IAM (Index Allocation Map): Information pertaining to extents that are used by a table or index per allocation unit. BCM (Bulk Changed Map): Keeps information about the extents changed in a Bulk Operation. DCM (Differential Change Map): This is the information of extents that have modified since the last BACKUP DATABASE statement as per allocation unit. Log File: It also known as write ahead log. It stores modification to the database (DML and DDL). Sufficient information is logged to be able to: Roll back transactions if requested Recover the database in case of failure Write Ahead Logging is used to create log entries Transaction logs are written in chronological order in a circular way Truncation policy for logs is based on the recovery model SQL OS: This lies between the host machine (Windows OS) and SQL Server. All the activities performed on database engine are taken care of by SQL OS. It is a highly configurable operating system with powerful API (application programming interface), enabling automatic locality and advanced parallelism. SQL OS provides various operating system services, such as memory management deals with buffer pool, log buffer and deadlock detection using the blocking and locking structure. Other services include exception handling, hosting for external components like Common Language Runtime, CLR etc. I guess this brief article gives you an idea about the various terminologies used related to SQL Server Architecture. In future articles we will explore them further. Guest Author  The author of the article is Anil Kumar Yadav is Trainer, SQL Domain, Koenig Solutions. Koenig is a premier IT training firm that provides several IT certifications, such as Oracle 11g, Server+, RHCA, SQL Server Training, Prince2 Foundation etc. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Security, SQL Server, SQL Tips and Tricks, SQL Training, T SQL, Technology

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  • SQL SERVER – Fix – Agent Starting Error 15281 – SQL Server blocked access to procedure ‘dbo.sp_get_sqlagent_properties’ of component ‘Agent XPs’ because this component is turned off as part of the security configuration for this server

    - by Pinal Dave
    SQL Server Agent fails to start because of the error 15281 is a very common error. When you start to restart SQL Agent sometimes it will give following error. SQL Server blocked access to procedure ‘dbo.sp_get_sqlagent_properties’ of component ‘Agent XPs’ because this component is turned off as part of the security configuration for this server. A system administrator can enable the use of ‘Agent XPs’ by using sp_configure. For more information about enabling ‘Agent XPs’, search for ‘Agent XPs’ in SQL Server Books Online. (Microsoft SQL Server, Error: 15281) To resolve this error, following script has to be executed on the server. sp_configure 'show advanced options', 1; GO RECONFIGURE; GO sp_configure 'Agent XPs', 1; GO RECONFIGURE GO When you run above script, it will give a very similar output as following on the screen. Now, if you try to restart SQL Agent it will just work fine. That’s it! Sometimes there is a simpler solution to complicated error. Reference: Pinal Dave (http://blog.sqlauthority.com)Filed under: PostADay, SQL, SQL Authority, SQL Error Messages, SQL Query, SQL Server, SQL Tips and Tricks, T SQL Tagged: SQL Server Agent

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  • SQL SERVER – Auto Recovery File Settings in SSMS – SQL in Sixty Seconds #034 – Video

    - by pinaldave
    Every developer once in a while facing an unfortunate situation where they have not yet saved the work and their SQL Server Management Studio crashes. Well, you can minimize the loss by optimizing auto recovery settings. In this video we can see how to set the auto recovery settings. Go to SSMS >> Tools >> Options >> Environment >> AutoRecover There are two different settings: 1) Save AutoRecover Information Every Minutes This option will save the SQL Query file at certain interval. Set this option to minimum value possible to avoid loss. If you have set this value to 5, in the worst possible case, you can loose last 5 minutes of the work. 2) Keep AutoRecover Information for Days This option will preserve the AutoRecovery information for specified days. Though, I suggest in case of accident open SQL Server Management Studio right away and recover your file. Do not procrastinate this important task for future dates. Related Tips in SQL in Sixty Seconds: Manage Help Settings – CTRL + ALT + F1 SSMS 2012 Reset Keyboard Shortcuts to Default A Cool Trick – Restoring the Default SQL Server Management Studio – SSMS Color Coding SQL Server Management Studio Status Bar – SQL in Sixty Seconds #023 – Video Clear Drop Down List of Recent Connection From SQL Server Management Studio SELECT TOP Shortcut in SQL Server Management Studio (SSMS) What would you like to see in the next SQL in Sixty Seconds video? Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Database, Pinal Dave, PostADay, SQL, SQL Authority, SQL in Sixty Seconds, SQL Query, SQL Scripts, SQL Server, SQL Server Management Studio, SQL Tips and Tricks, T SQL, Technology, Video Tagged: Excel

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  • Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)

    - by Bakhtiyor
    I have mailserver configure using dovecot+postfix+mysql and it was runnig fine in the server(Ubuntu Server). But during last week it stopped working correctly. It doesn't send email. When I try to telnet localhost smtp I'm connecting successfully but when I do mail from:<[email protected]> and hit Enter it hangs on, nothing happen. Having reviewed /var/log/mail.log file I've found out that probably(99%) the problem is on postfix when it is trying to connect to MySQL server. If you see the log file given below you can see that it says Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2). Nov 14 21:54:36 ns1 dovecot: dovecot: Killed with signal 15 (by pid=7731 uid=0 code=kill) Nov 14 21:54:36 ns1 dovecot: Dovecot v1.2.9 starting up (core dumps disabled) Nov 14 21:54:36 ns1 dovecot: auth-worker(default): mysql: Connected to localhost (mailserver) Nov 14 21:54:44 ns1 postfix/postfix-script[7753]: refreshing the Postfix mail system Nov 14 21:54:44 ns1 postfix/master[1670]: reload -- version 2.7.0, configuration /etc/postfix Nov 14 21:54:52 ns1 postfix/trivial-rewrite[7759]: warning: connect to mysql server localhost: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) Nov 14 21:54:52 ns1 postfix/trivial-rewrite[7759]: fatal: mysql:/etc/postfix/mysql-virtual-alias-maps.cf(0,lock|fold_fix): table lookup problem Nov 14 21:54:53 ns1 postfix/master[1670]: warning: process /usr/lib/postfix/trivial-rewrite pid 7759 exit status 1 Nov 14 21:54:53 ns1 postfix/cleanup[7397]: warning: problem talking to service rewrite: Connection reset by peer Nov 14 21:54:53 ns1 postfix/master[1670]: warning: /usr/lib/postfix/trivial-rewrite: bad command startup -- throttling Nov 14 21:54:53 ns1 postfix/smtpd[7071]: warning: problem talking to service rewrite: Success I tried netstat -ln | grep mysql and it returns unix 2 [ ACC ] STREAM LISTENING 5817 /var/run/mysqld/mysqld.sock. The content of /etc/postfix/mysql-virtual-alias-maps.cf file is here: user = stevejobs password = apple hosts = localhost dbname = mailserver query = SELECT destination FROM virtual_aliases WHERE source='%s' Here I tried to change hosts = 127.0.0.1 but it says warning: connect to mysql server 127.0.0.1: Can't connect to MySQL server on '127.0.0.1' (110) So, I am lost and don't know where else to change in order to solve the problem. Any help would be appreciated highly. Thank you.

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  • Dynamic DNS registration for VPN clients

    - by Eric Falsken
    I've got a VPN server set up in my Active Directory on a remote network. (VPN Server is separate box from DNS/AD) When I dial into the network (client machine is not a member of the AD) the machine does not register its IP or Hostname in the DNS. I've played with all possible combinations of DHCP and RRAS-allocated IP pools, and none of them seem to cause my client to register. Is it because my client has to be a member of the domain? Are there some security settins I can tweak so that it can register its hostname/ip? I've looked in the event logs (System and Security) for the AD, DNS, DHCP, RRAS, and the client machine, and don't see anything relating to DNS Registration. Here's the IPConfig on the client machine (once connected): PPP adapter My VPN Name: Connection-specific DNS Suffix . : mydomain.local Description . . . . . . . . . . . : My VPN Name Physical Address. . . . . . . . . : DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes IPv4 Address. . . . . . . . . . . : 192.168.1.22(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.255 Default Gateway . . . . . . . . . : DNS Servers . . . . . . . . . . . : 192.168.1.52 <- DC1 192.168.1.53 <- DC2 NetBIOS over Tcpip. . . . . . . . : Enabled Edit: It looks like my clients are not recieving the DHCP Scoope Options. I found this great article in Microsoft's KB. So the problem here is that the VPN Server "pre-reserves" the DHCP addresses, but then you have to add the DHCP Relay Agent to relay the secondary request for scope options. My problem is that the DHCP Relay Agent isn't relaying to the local DHCP server (same box as the VPN/RRAS). I've configured the DHCP Relay Agent according to this KB, but it dosn't work for a local DHCP server. (I see the request count increasing, but no responses) I was able to get everything working by specifying the DNS server and domain name in the VPN connection properties on the client. But am still unable to assign it (or the default gateway) dynamically via DHCP. The client also has to be a member of the remote domain.

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  • DNS problems on CentOS fresh install

    - by Rick Koshi
    I'm having some DNS issues on a new box I'm installing with CentOS 6.2. I am able to look up names using nslookup, dig, or host. I am able to ping machines by name or by IP address. However, when I try other tools, such as ssh, wget, or yum, they are unable to resolve names. For example: # wget http://www.google.com --2012-03-08 14:48:06-- http://www.google.com/ Resolving www.google.com... failed: Name or service not known. wget: unable to resolve host address `www.google.com' # ssh www.google.com ssh: Could not resolve hostname www.google.com: Name or service not known # ping -c 1 www.google.com PING www.l.google.com (74.125.113.106) 56(84) bytes of data. 64 bytes from vw-in-f106.1e100.net (74.125.113.106): icmp_seq=1 ttl=46 time=43.6 ms --- www.l.google.com ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 59ms rtt min/avg/max/mdev = 43.665/43.665/43.665/0.000 ms # host www.google.com www.google.com is an alias for www.l.google.com. www.l.google.com has address 74.125.113.99 www.l.google.com has address 74.125.113.103 www.l.google.com has address 74.125.113.104 www.l.google.com has address 74.125.113.105 www.l.google.com has address 74.125.113.106 www.l.google.com has address 74.125.113.147 My /etc/nsswitch.conf file is the default, including this (standard) line: hosts: files dns /etc/resolv.conf is as set up by DHCP: ; generated by /sbin/dhclient-script nameserver 192.168.1.254 192.168.1.254 is a working DNS server (my DSL modem, working for years with other machines) Anyone know why ping would work, but ssh/wget would fail? Per NcA's suggestion, I tried changing /etc/resolv.conf to point to 8.8.8.8. Oddly enough, this does make it work. Obviously, my DSL modem is responding to DNS requests in some way that some parts of Linux's resolution system don't like. Looking at the tcpdump, I am unable to see what the difference is. Certainly, both servers are sending the same addresses. Here's the output from tcpdump -nn -X with the server set to the DNS server on the DSL modem. It's clearly replying with the correct addresses, but ssh/wget don't seem happy with it for some reason: 15:53:52.133580 IP 192.168.1.254.53 > 192.168.1.2.54836: 33157 7/0/0 CNAME www.l.google.com., A 74.125.115.105, A 74.125.115.106, A 74.125.115.147, A 74.125.115.99, A 74.125.115.103, A 74.125.115.104 (148) 0x0000: 4500 00b0 e33a 0000 ff11 53b1 c0a8 01fe E....:....S..... 0x0010: c0a8 0102 0035 d634 009c 7528 8185 8180 .....5.4..u(.... 0x0020: 0001 0007 0000 0000 0377 7777 0667 6f6f .........www.goo 0x0030: 676c 6503 636f 6d00 0001 0001 c00c 0005 gle.com......... 0x0040: 0001 0007 acd0 0008 0377 7777 016c c010 .........www.l.. 0x0050: c02c 0001 0001 0000 0001 0004 4a7d 7369 .,..........J}si 0x0060: c02c 0001 0001 0000 0001 0004 4a7d 736a .,..........J}sj 0x0070: c02c 0001 0001 0000 0001 0004 4a7d 7393 .,..........J}s. 0x0080: c02c 0001 0001 0000 0001 0004 4a7d 7363 .,..........J}sc 0x0090: c02c 0001 0001 0000 0001 0004 4a7d 7367 .,..........J}sg 0x00a0: c02c 0001 0001 0000 0001 0004 4a7d 7368 .,..........J}sh 15:53:52.135669 IP 192.168.1.254.53 > 192.168.1.2.54836: 65062- 0/0/0 (32) 0x0000: 4500 003c e33b 0000 ff11 5424 c0a8 01fe E..<.;....T$.... 0x0010: c0a8 0102 0035 d634 0028 98f9 fe26 8000 .....5.4.(...&.. 0x0020: 0001 0000 0000 0000 0377 7777 0667 6f6f .........www.goo 0x0030: 676c 6503 636f 6d00 001c 0001 gle.com..... I'm not enough of an expert to know if this is malformed in some way, but ping seems to do the right thing with it. For comparison, here's the same thing when querying 8.8.8.8: 15:57:27.990270 IP 8.8.8.8.53 > 192.168.1.2.49028: 59114 7/0/0 CNAME www.l.google.com., A 74.125.113.105, A 74.125.113.103, A 74.125.113.106, A 74.125.113.147, A 74.125.113.104, A 74.125.113.99 (148) 0x0000: 4500 00b0 5530 0000 2f11 6453 0808 0808 E...U0../.dS.... 0x0010: c0a8 0102 0035 bf84 009c 39f8 e6ea 8180 .....5....9..... 0x0020: 0001 0007 0000 0000 0377 7777 0667 6f6f .........www.goo 0x0030: 676c 6503 636f 6d00 0001 0001 c00c 0005 gle.com......... 0x0040: 0001 0001 516a 0008 0377 7777 016c c010 ....Qj...www.l.. 0x0050: c02c 0001 0001 0000 0116 0004 4a7d 7169 .,..........J}qi 0x0060: c02c 0001 0001 0000 0116 0004 4a7d 7167 .,..........J}qg 0x0070: c02c 0001 0001 0000 0116 0004 4a7d 716a .,..........J}qj 0x0080: c02c 0001 0001 0000 0116 0004 4a7d 7193 .,..........J}q. 0x0090: c02c 0001 0001 0000 0116 0004 4a7d 7168 .,..........J}qh 0x00a0: c02c 0001 0001 0000 0116 0004 4a7d 7163 .,..........J}qc 15:57:28.018909 IP 8.8.8.8.53 > 192.168.1.2.49028: 31984 1/1/0 CNAME www.l.google.com. (102) 0x0000: 4500 0082 7b1b 0000 2f11 3e96 0808 0808 E...{.../.>..... 0x0010: c0a8 0102 0035 bf84 006e c67e 7cf0 8180 .....5...n.~|... 0x0020: 0001 0001 0001 0000 0377 7777 0667 6f6f .........www.goo 0x0030: 676c 6503 636f 6d00 001c 0001 c00c 0005 gle.com......... 0x0040: 0001 0001 517f 0008 0377 7777 016c c010 ....Q....www.l.. 0x0050: c030 0006 0001 0000 0258 0026 036e 7334 .0.......X.&.ns4 0x0060: c010 0964 6e73 2d61 646d 696e c010 0016 ...dns-admin.... 0x0070: 91f3 0000 0384 0000 0384 0000 0708 0000 ................ 0x0080: 003c .< I still don't know why the server's reply is adequate for ping but not for ssh/wget. If anyone has ideas, I'd be happy to hear them. For now, though, I can either refer to an outside DNS server or set up my own server on the new box. It's a workaround that seems like it should be unnecessary, but will allow me to proceed.

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  • IPV6 causing issue with DNS

    - by Mike Wells
    I have set up an 'internal' DNS at my work, basically we have ourdomain.com that is for internet, email etc and I have created on one of our linux network servers (debian) a DNS using bind9 with the domain ourdomain.inc. So based on my files below and the symptoms I'm describing; what effect could IPV6 be having on my setup? What can I do to fix this? I assume it is not actually the IPV6 causing the issue, but rather something in my setup. These are the critical (I think) files I have modified: named.conf.local zone "ourdomain.inc" { type master; file "/etc/bind/zones/ourdomain.inc.db"; }; zone "201.168.192.in-addr.arpa" { type master; file "/etc/bind/zones/rev.201.168.192.in-addr.arpa"; }; named.conf.options options { directory "/var/cache/bind"; // If there is a firewall between you and nameservers you want // to talk to, you may need to fix the firewall to allow multiple // ports to talk. See http://www.kb.cert.org/vuls/id/800113 // If your ISP provided one or more IP addresses for stable // nameservers, you probably want to use them as forwarders. // Uncomment the following block, and insert the addresses replacing // the all-0's placeholder. forwarders { 1.2.3.4; //IP of our external DNS provider }; auth-nxdomain no; # conform to RFC1035 listen-on-v6 { any; }; }; ourdomain.inc.db $TTL 86400 ourdomain.inc. IN SOA ns1.ipower.com. admin.ourdomain.inc. ( 2006081401 28800 3600 604800 38400 ) serv1 IN A 192.168.201.223 serv2 IN A 192.168.201.220 serv3 IN A 192.168.201.219 ns1.ipower.com. IN A 1.2.3.4 ns2.ipower.com. IN A 1.2.3.5 @ IN NS ns1.ipower.com. @ IN NS ns2.ipower.com. svn IN CNAME serv1 docs IN CNAME serv2 jira IN CNAME serv3 confluence IN CNAME serv3 fisheye IN CNAME serv3 rev.201.168.192.in-addr.arpa $TTL 86400 201.168.192.in-addr.arpa. IN SOA ns1.ipower.com. admin.ourdomain.inc. ( 2006081401; 28800; 604800; 604800; 86400 ) 223 IN PTR serv1 @ IN NS ns1.ipower.com. @ IN NS ns2.ipower.com. named.conf include "/etc/bind/named.conf.options"; include "/etc/bind/named.conf.local"; include "/etc/bind/named.conf.default-zones"; I then made our internal DNS my preferred DNS with the two external DNSs the next in-line. More the most part this seems to work, I can ping svn.ourdomain.inc and it resolves to the correct IP, I can also ping google.com and it also resolves no problem. So all seem good. However, periodically (couple of times a day at least), I loose the ability to ping the svn.domain.inc (and all others defined under the internal DNS). What seem to fix the issue temporarily is to disable IPV6 on the network adapter of the client machine and then re-enable it. Then it works for a bit but will always fail again. System Info Internal DNS Distributor ID: Debian Description: Debian GNU/Linux 6.0.6 (squeeze) Release: 6.0.6 Codename: squeeze Linux 2.6.32-5-686 i686 BIND 9.7.3 PC OS Name: Microsoft Windows 7 Professional OS Version: 6.1.7601 Service Pack 1 Build 7601 System Type: x64-based PC Network Card(s): 2 NIC(s) Installed. [01]: Realtek PCIe GBE Family Controller Connection Name: WORK LAN DHCP Enabled: No IP address(es) [01]: the.ipv4.address [02]: the:ipv6:address The question... So based on my files above and the symptoms I described; what effect could IPV6 be having on my setup? What can I do to fix this? I assume it is not actually the IPV6 causing the issue, but rather something in my setup.

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  • Trying to get DNS services running on Windows Server 2008 R2, what am I getting wrong ?

    - by LaserBeak
    Ok, So I am basically trying to get a home server pc up that will provide Domain name services, act as Mail server and web server. I have one static IP, well it's not officially static but hasn't changed in two years so I'll call it static. I have done the following: Configured router NAT/virtual port forward UDP/TCP port 53 to the internal IP of my server 192.168.1.16, in adapter settings specified the manual settings: 192.168.1.16 IP, gateway 192.168.1.1, Subnet: 255.255.255.0 and loopback DNS: 127.0.0.1 Using my public my public IP Checked using http://www.canyouseeme.org/ that port 53 is open and is not being blocked by my ISP. It can see services on this port. Registered Domain name (mydomain.com.au) Updated whois database through the domain registrars site and registered NameServer names: ns0.mydomain.com.au and ns2.mydomain.com.au, both have been associated with my single public IP. (Waited 24 hours) Update the nameserver for mydomain.com.au: primary ns0.mydomain.com.au secondary: ns2.mydomain.com.au (waited 24+ hours) Installed Server 2008 R2, install web server role and DNS role. Webserver works when I enter my public IP into browser of any PC/mobile, get IIS7 welcome page. In DNS server: Created new forward lookup zone: ; ; Database file mydoman.com.au.dns for mydomain.com.au zone. ; Zone version: 10 ; @ IN SOA mydomain.com.au. mydomain.testdomain.com. ( 10 ; serial number 900 ; refresh 600 ; retry 86400 ; expire 3600 ) ; default TTL ; ; Zone NS records ; @ NS ns0.mydomain.com.au. @ NS ns1.mydomain.com.au. ; ; Zone records ; @ A 192.168.1.16 www A 192.168.1.16 The Domain name services will however not work, the whois database updated with ns0.mydomain.com.au etc. but when I type in my site name www.mydomain.com.au from an external machine it will not open site and I can't even ping it (Can't find host) When I check the ns0.mydomain.com.au NS record using a tool Like: http://www.squish.net/dnscheck/ I get: Security: Server ns0.mydomain.com.au (XXX.XXX.XXX.XX <- my public IP) is recursive Domain exists but there is no such record Any ideas, thanks...

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  • Weird "missing" CD/DVD driver during Windows Server 2008 installation

    - by Django Reinhardt
    Hi. We have an old PowerEdge 860 that we're trying to install Windows Server 2008 R2 onto. At present the machine doesn't have any OS installed, so we're doing a clean install from a DVD. Pretty simple stuff. The problem is that, although the installation process starts off well (asking for language and locale settings), as soon as we click "Install Now" we're told "A required CD/DVD device driver is missing." The operating system has already booted from our only DVD drive(!). I've seen other people complain about this problem (usually in relation to installing Vista or Windows 7) but I've not found a 100% solution yet. (Our DVD drive is a Hitachi LG GWA-4400N, salvaged from an old laptop. There have never been any drivers released for this device, nor any firmware updates.) The most promising lead I have is from someone claiming that Windows is actually asking for a driver for the ATAPI/IDE Controller here. UPDATE See my answer below... It was most likely a corrupt download. (*shame*) I will update this question when I know for sure.

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  • SQL SERVER – SQL Server Misconceptions and Resolution – A Practical Perspective – TechEd 2012 India

    - by pinaldave
    TechEd India 2012 is just around the corner and I will be presenting there in two different sessions. On the very first day of this event, my presentation will be all about SQL Server Misconceptions and Resolution – A Practical Perspective. The dictionary tells us that a “misconception” means a view or opinion that is incorrect and is based on faulty thinking or understanding. In SQL Server, there are so many misconceptions. In fact, when I hear some of these misconceptions, I feel like fainting at that very moment! Seriously, at one time, I came across the scenario where instead of using INSERT INTO…SELECT, the developer used CURSOR believing that cursor is faster (duh!). Here is the link the blog post related to this. Pinal and Vinod in 2009 I have been presenting in TechEd India for last three years. This is my fourth opportunity to present a technical session on SQL Server. Just like the previous years, I decided to present something different. Here is a novelty of this year: I will be presenting this session with Vinod Kumar. Vinod Kumar and I have a great synergy when we work together. So far, we have written one SQL Server Interview Questions and Answers book and 2 video courses: (1) SQL Server Questions and Answers (2) SQL Server Performance: Indexing Basics. Pinal and Vinod in 2011 When we sat together and started building an outline for this course, we had many options in mind for this tango session. However, we have decided that we will make this session as lively as possible while keeping it natural at the same time. We know our flow and we know our conversation highlight, but we do not know what exactly each of us is going to present. We have decided to challenge each other on stage and push each other’s knowledge to the verge. We promise that the session will be entertaining with lots of SQL Server trivia, tips and tricks. Here are the challenges that I’ll take on: I will puzzle Vinod with my difficult questions I will present such misconception that Vinod will have no resolution for it. I need your help.  Will you help me stump Vinod? If yes, come and attend our session and join me to prove that together we are superior (a friendly brain clash, but we must win!). SQL Server enthusiasts and SQL Server fans are going to have gala time at #TechEdIn as we have a very solid lineup of the speaker and extremely interesting sessions at TechEdIn. Read the complete blog post of Vinod. Session Details Title: SQL Server Misconceptions and Resolution – A Practical Perspective (Add to Calendar) Abstract: “Earth is flat”! – An ancient common misconception, which has been proven incorrect as we progressed in modern times. In this session we will see various database misconceptions prevailing and their resolution with the aid of the demos. In this unique session audience will be part of the conversation and resolution. Date and Time: March 21, 2012, 15:15 to 16:15 Location: Hotel Lalit Ashok - Kumara Krupa High Grounds, Bengaluru – 560001, Karnataka, India. Add to Calendar Please submit your questions in the comments area and I will be for sure discussing them during my session. If I pick your question to discuss during my session, here is your gift I commit right now – SQL Server Interview Questions and Answers Book. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Interview Questions and Answers, SQL Performance, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology Tagged: TechEd, TechEdIn

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  • SQL SERVER – Learn SQL Server 2014 Online in a Day – My Latest Pluralsight Course

    - by Pinal Dave
    Click here watch SQL Server 2014 Administration New Features.  SQL Server 2014 was released earlier this year and it has been extremely popular in Microsoft world. Here is the announcement for everyone, who have been asking me to build a tutorial around SQL Server 2014. I have authored latest Pluralsight courses on the subject of SQL Server 2014. This course is 4 hours and 17 minutes long, but the best part is that this course contains all the latest features of SQL Server 2014. I have build this course with the assumption that DBA is familiar with earlier versions of SQL Server and wants to explore and learn new features of SQL Server 2014. The Challenge I Faced The biggest challenge I faced was how to come up with the outline for the course. The reason is that there are so many different features introduced in SQL Server 2014 that is will be difficult to cover each of the features in a single course. I wanted to cover the topics which are the most relevant and useful to developers, but in addition I also wanted to cover the topics which may be useful to develop if they know that they exists in the product. I finally decided to depend on blog readers and few of the SQL Experts. I reached out to selected 20 people via email and gave them a list of the topics which I should be covering in this course. They all work in different organizations and have a good understanding about the need of the DBA and Developers. Based on their feedback, I was able to come up with a very good outline which is currently very popular with Pluralsight library. Lots of people have asked me how was I able to come up with a course content outline so accurately. The credit for the same goes to the developers and DBA, who have voted in the topics and have helped me to build a very solid outline for the course. Outline of the Course Here is a quick outline for the course: Introduction Backup Enhancements Security Enhancements Columnstore Enhancements Online Data Operations Enhancements Enhancements with Microsoft Azure SSD Buffer Pool Extensions Resource Governor IO Miscellaneous Features Online Index Rebuilding Live Plans for Long Running Queries Transaction Durability Cardinality Estimation In Memory OLTP Optimization Well, I had a great fun working on the topics which I have mentioned in the outline. I am very confident that once you start with the course, you will indeed understand how each of the topics builds and presented. I have made sure that each of the topic has a vivid and clear story to begin with. I first explain the story and right after that I explain the concept. Who Should Attend This Course Everyone who has basic knowledge of SQL Server and wants to update themselves with SQL Server 2014. They should attend this course. One thing I have made sure that this course is easy to understand and I have decided complex subject into multiple parts. This way the learning is progressive and anyone with a poor knowledge of the subject can have enough time to understand the presented concept. Screenshot of the Course Here are few of the screenshot of the courses. How to Watch Video Course This course is available at Pluralsight, and you will need a valid login to Pluralsight. If you do not have Pluralsight login, you can quickly sign up for the FREE Trial. Click here watch SQL Server 2014 Administration New Features.  Reference: Pinal Dave (http://blog.SQLAuthority.com)Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQL Training, SQLAuthority News, T SQL, Video

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  • ????????????????WebLogic Server??????????????--CTC??WebLoDOCK???WebLogic?????????

    - by ???02
    ?WebLogic Server??????????????????????????????????WebLogic Server??????????????????????--??????????????????????????????(CTC)???????????WebLogic?????? WebLoDOCK????????????WebLogic???????????WebLogic Server?????????????????????????????????????????????????????????????????????????? ??????????? Web?????????????????????????(???) ????????????CTC?WebLogic Server???????? ?????????????? ???????????? ??????????? Web?????????????? Java EE????????????????WebLogic Server???????????16???????????WebLogic Server?????????????????????????????????????CTC??????????????WebLogic?????? WebLoDOCK(???WebLoDOCK)????????????WebLogic????????(???WebLogic????????)??????????????CTC????????????????????WebLogic Server????????????????????????2???????????????????????? ?WebLogic Server??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????WebLoDOCK?WebLogic?????????????(???) IT?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????(???) WebLoDOCK?WebLogic????????????????????????????????????????????????????????? WebLogic Server?????????--WebLoDOCK WebLoDOCK??WebLogic Server??????????????????????????WebLogic Server???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????PDCA????????????????WebLogic Server????????????????? WebLoDOCK???WebLogic Server??????????????2??????????????????????????????????????????????????1??????????·??????????WebLogic Server????????????????·????????????·??????????????·??/????·??????????????????????????????2?????????????? ???WebLoDOCK???????????????????????????????????????????·???????????????????????????????????????????????WebLoDOCK????????????????????????? ??????WebLoDOCK??????WebLogic Server????????????????????????????????CTC????????????????????????????????????????????????????????????????? ???????????????????--WebLogic???????? ???WebLogic???????????????????????·??????????WebLogic Server??????????????????????????????????????????????????????????????????????????????????????????4??????????????????????????????????????? ?????????????????????CTC????????????????? ?????????????? ???????????? ??????????? Web?????????????? ???????????????????????WebLogic Server??????????????????IT?????????????????????????????????????????·????????????????????????????????????????????????·??????????????????????????WebLogic Server?????????????????????????(???) ???WebLogic?????????????????????????????????????????????????????????? ????????????????????????????????????????????????????????????????????????????????????????????????????? ??????WebLogic Server??????????????????????????????????????????????????????????????? ???????????????????????????WebLogic Server?????????????????????????????(???) WebLogic Server?????????????????????????? ????????????WebLoDOCK?WebLogic??????????????CTC????????WebLogic Server?????????????????????????????????????????????????BEA??????WebLogic?(WebLogic Server???????)???????????????????????BEA??????????????????????????????????????????????? ??????????????????????????????????CTC?WebLogic Server????????Oracle Exalogic?????????(Exalogic Elastic Cloud Specialization)??????????????WebLogic Server?????????????????????????WebLogic Server???????????????????? ????????????????????????????????????????????????????????????Oracle ACE?????????CTC??????????????????????WebLoDOCK/WebLogic?????????????????????1???????????????????????WebLogic Server???(?????)????????????? ?????? WebLogic Server 12c????????????????????????????????????/???????WebLogic Server 12c Forum 2012?????···????????WebLogic Server 12c????/???????????????? ????????????????WebLogic Server 12c???????????????????????????????????????????WebLogic Server????????????????????????????? ?????(???????)? CTC?Oracle WebLogic Server???????????????--Oracle WebLogic Server??????????????????

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  • Move database from SQL Server 2012 to 2008

    - by Rich
    I have a database on a SQL Sever 2012 instance which I would like to copy to a 2008 server. The 2008 server cannot restore backups created by a 2012 server (I have tried). I cannot find any options in 2012 to create a 2008 compatible backup. Am I missing something? Is there an easy way to export the schema and data to a version-agnostic format which I can then import into 2008? The database does not use any 2012 specific features. It contains tables, data and stored procedures. Here is what I have tried so far: I tried "tasks" - "generate scripts" on the 2012 server, and I was able to generate the schema (including stored procedures) as a sql script. This didn't include any of the data, though. After creating that schema on my 2008 machine, I was able to open the "Export Data" wizard on the 2012 machine, and after configuring the 2012 as source machine and the 2008 as target machine, I was presented with a list of tables which I could copy. I selected all my tables (300+), and clicked through the wizard. Unfortunately it spends ages generating its scripts, then fails with errors like "Failure inserting into the read-only column 'FOO_ID'". I also tried the "Copy Database Wizard", which claimed to be able to copy "from 2000 or later to 2005 or later". It has two modes: 1) "detach and attach", which failed with error: Message: Index was outside the bounds of the array. StackTrace: at Microsoft.SqlServer.Management.Smo.PropertyBag.SetValue(Int32 index, Object value) ... at Microsoft.SqlServer.Management.Smo.DataFile.get_FileName() 2) SQL Management Object Method which failed with error "Cannot read property IsFileStream.This property is not available on SQL Server 7.0."

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  • Dynamic DNS registration for VPN clients

    - by Eric Falsken
    I've got a VPN server set up in my Active Directory on a remote network. (VPN Server is separate box from DNS/AD) When I dial into the network (client machine is not a member of the AD) the machine does not register its IP or Hostname in the DNS. I've played with all possible combinations of DHCP and RRAS-allocated IP pools, and none of them seem to cause my client to register. Is it because my client has to be a member of the domain? Are there some security settins I can tweak so that it can register its hostname/ip? I've looked in the event logs (System and Security) for the AD, DNS, DHCP, RRAS, and the client machine, and don't see anything relating to DNS Registration. Here's the IPConfig on the client machine (once connected): PPP adapter My VPN Name: Connection-specific DNS Suffix . : mydomain.local Description . . . . . . . . . . . : My VPN Name Physical Address. . . . . . . . . : DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes IPv4 Address. . . . . . . . . . . : 192.168.1.22(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.255 Default Gateway . . . . . . . . . : DNS Servers . . . . . . . . . . . : 192.168.1.52 <- DC1 192.168.1.53 <- DC2 NetBIOS over Tcpip. . . . . . . . : Enabled

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  • Server 2008, 2 NICs, 2 fixed IPs - big delays using internet

    - by user46055
    Hi geniuses I have an all in one Windows 2008 server, configured with AD/DHCP/DNS/RRAS - all set up with wizards and no specific tweaking. The server has 2 network adapters : one of which ("MyWAN") is plugged into our office's internet connection, the other ("MyLAN") is plugged into a local switch, which is also where all our desktops are connected. So this one server is doing everything. When first set up, MyLAN had a fixed IP of 192.168.2.1 and served the desktops with DHCP scope 192.168.2.50-99. It also told them to use 192.168.2.1 as DNS and gateway. MyWAN was setup to take its IP etc from DHCP, being handled by the building's router and ADSL modem etc. All desktops were setup to use DHCP. This all worked perfectly fine, until I recently changed MyWAN to have a static IP (I wanted to access it from home, and needed to give it a static IP to port map in the building's router). Things still work, but there is now a long delay when accessing the internet. The actual speed is as before when downloading, but there is a pause of 3-6 secs when connecting to new hosts (for example if I browse to slashdot from either a desktop or the server itself, it'll hang on connecting to slashdot.org, hang again on connecting to *.fsdn, *.google-analytics.com and all the other hosts referenced from the main page). If I ping slashdot.org from the server, I get the following : Pinging slashdot.org [216.34.181.45] with 32 bytes of data: Reply from 192.168.2.1: Destination host unreachable. Reply from 216.34.181.45: bytes=32 time=99ms TTL=239 Reply from 216.34.181.45: bytes=32 time=100ms TTL=239 Reply from 216.34.181.45: bytes=32 time=101ms TTL=239 Pinging anywhere external always seems to hit 192.168.2.1 first, which doesn't seem right. Trying tracert from the server gives the following : Tracing route to slashdot.org [216.34.181.45] over a maximum of 30 hops: 1 MYSERVER01.intranet [192.168.2.1] reports: Destination host unreachable Trying tracert from a desktop gives the following : Tracing route to slashdot.org [216.34.181.45] over a maximum of 30 hops: 1 <1 ms * <1 ms MYSERVER [192.168.2.1] 2 * * * Request timed out. 3 6 ms 6 ms 6 ms dsl-gw1.ge.mer.uk.webtapestry.net [217.151.111.17] 4 38 ms 239 ms 251 ms gw-router.ge.mer.uk.webtapestry.net [217.151.111.13] ...and then all is fine after that. I think that DNS is working fine because the domain names are getting translated to correct IPs immediately. DHCP seems to be okay? So perhaps it's something up with my RRAS setup - although I can't see any option during the setup wizard which I would have filled in differently. I've also tried changing the binding order of the two network connections, to prioritise MyWAN, but that doesn't seem to have done anything. Any idea what's up? Many thanks - Rob

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  • DNS NS and domain clarification

    - by thejartender
    I am really trying to get my home web server up and I don't seem to be succeeding. My web server withing my host system is running my web application and is viewable at the current isp ip 88.89.190.171 over WAN indicating that the webapp is fine and that router ports are forwarded. I have set up a DNS on this system with a single name server in the network and I manage to ping it with ping ns.thejarbar.org I have registered this private name server at my current hosting provider. My domain (thejarbar.org) is obviously registered and I have pointed it to my name server. My question here is if it is simply a matter of waiting on propagation for me to be able to ping my domain? Another way of asking this is if the fact that my name server is discoverable indicates that I have set it up correctly to be used? I have tested with dig and dig -x on my host and have A records for the name server. The server is not the Authorative server so I am concerned that this may be the reason why my site is not discoverable. Is there anything else I may need to so still? I only have one ns. currently, but should this succeed I will be purchasing a more stable secondary system to host my development applications. This is my best chance at getting work (freelance development) due to illness) and this I feel is the last step I need to succeed. Please note that this is temporarily a home server and I will most likely be using it as part of a professional setup very soon I will likely have to repeat this question therefore in a prefessional context in a few weeks as nothing will be different other than the fact that I am going to have a server running elsewhere. I am using bind9 and Ubuntu 12.10 and my records are: $TTL 3D @ IN SOA ns.thejarbar.org. email. ( 13112012 28800 3600 604800 38400 ); thejarbar.org. IN A 10.0.0.42 @ IN NS ns.thejarbar,org. yuccalaptop IN A 10.0.0.19 ns IN A 10.0.0.42 gw IN A 10.0.0.138 www IN CNAME thejarbar.org. $TTL 3D 0.0.10.in-addr.arpa. IN SOA ns.thejarbar.org. email. ( 13112012 28800 3600 604800 38400 ); 0.0.10.in-addr.arpa. IN NS ns.thejarbar.org. 42 IN PTR thejarbar.org. 19 IN PTR yuccalaptop.thejarbar.org. 138 IN PTR gw.thejarbar.org. My localhost IP is 10.0.0.42 I wish for this to be my host and name server.

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  • DNS: how to get local server to superimpose results over authoritative server?

    - by growse
    I've got a domain for which the DNS I control, and is hosted on the internet. I also have a NAT'd internal network (192.168.0.0/24) which has internet access, and which I also control. On this internal network, I also have a DNS resolver. DNS software on both is PowerDNS. What I want to be able to do is for the DNS resolver on the internal network to be able to add/change records of queries and results that come down from the authoritative server. For example, the authoritative server might have a single record for animal.example.com: animal.example.com. IN AAAA 2001:140:283::1 However, I'd like it so that when internal clients do a dns lookup for animal.example.com, they might get back the following: animal.example.com. IN AAAA 2001:140:283::1 animal.example.com. IN A 192.168.0.2 Obviously, I could set up the internal DNS server to pretend to be authoritative for example.com, but that would require a fair bit of effort to keep the main DNS server and the internal DNS server in sync for the records which are the same between both. If the internal DNS server could somehow be made a slave of the main DNS server, but also have the provision to add its own results in, that would be ideal. Is this possible?

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