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• How to balance the root domain using NS records?

  - by Patrick McCurley

  I have two load balancers that balance incoming traffic across multiple data centers. These work fine. I can test them out by doing an 'nslookup mydomain.com xIP' I have now taken out DNS services with DYN.com to allow me to manage the DNS Zone file so that typing mydomain.com will ask my load balancers what the IP address is to resolve. Step 1 : the NS record for www. I set up A records (glue) for ns1 & ns2, then the corresponding NS record to delegate the DNS lookup to the balancers instead of DYN.com's nameservers. ns1.mydomain.com A [ip address of load balancer 1] ns2.mydomain.com A [ip address of load balancer 1] www.mydomain.com NS ns1.mydomain.com www.mydomain.com NS ns2.mydomain.com All is well - when I type www.mydomain.com, the requests get delegated to my load balancers who provide the IP address of the endpoint and the connect is made successfully. Step 2 : the NS record for root. This is where I run into problems. I need customers to be able to type 'mydomain.com' (without the www) and ALSO get delegated to the load balancers for the IP address. However - of the research I have done, and through the DYN control panel, it seems to be not allowed to provide an NS record for the root - as this overrides the default NS servers. How can i delegate both the root, and the www. to my load balancers?

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• Adding 2008 Server to 2008 Domain

  - by Phillip

  Hello, I'm trying to create a lab for testing before I deploy solutions, I'm no experienced IT Administrator, and therefore I come here for help. I'm running 2 Virtual Servers on the same machine on a local connection between those two. They'are able to ping each other. Their names is TSDATA1 and TSDATA2 where TSDATA1 is the Domain Controller. I am able to ping between those two, on both "ping TSDATA1" and "ping 10.0.0.1" which is the IP address of TSDATA1. The IP address of TSDATA2 is 10.0.0.2. I'm trying to join the domain with TSDATA2 both I'm getting this error when trying: Note: This information is intended for a network administrator. If you are not your network's administrator, notify the administrator that you received this information, which has been recorded in the file C:\Windows\debug\dcdiag.txt. The following error occurred when DNS was queried for the service location (SRV) resource record used to locate an Active Directory Domain Controller for domain tsdata.local: The error was: "DNS name does not exist." (error code 0x0000232B RCODE_NAME_ERROR) The query was for the SRV record for _ldap._tcp.dc._msdcs.tsdata.local Common causes of this error include the following: The DNS SRV records required to locate a AD DC for the domain are not registered in DNS. These records are registered with a DNS server automatically when a AD DC is added to a domain. They are updated by the AD DC at set intervals. This computer is configured to use DNS servers with the following IP addresses: 10.0.0.1 One or more of the following zones do not include delegation to its child zone: tsdata.local local . (the root zone) For information about correcting this problem, click Help. I've figured out it has something to do with DNS lookup, but I have no clue what to do. Can anyone help?

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• How to verify a self-signed certificate from another server using openssl?

  - by ntsue

  I am new to openssl and I am having some trouble verifying (from a client machine) an ftp server using ssl with a self-signed certificate. I generated the .cer file by going to my server in IIS and exporting the certificate without the private key. I believe that this is all that I should need on the client side, right? I use the following code to verify the certificate openssl verify ftp.cer and the error that I get back is error 20 at 0 depth lookup:unable to get local issuer certificate I tried this as well: openssl verify -CAfile ftp.cer ftp.cer but received the same error. From what I understand about SSL, this is happening because I have no chain of trust that connects to this server. By default, openssl did not install any trusted CAs and this is fine. I would just like to tell it to trust this server. I tried various tutorials telling me how to add a certificate authority, including this one here, however the instructions are for linux and include adding a symlink and I am trying to do this in windows. If anyone could provide any guidance on how to do this, or enlighten me if I am not understanding something correctly, I would greatly appreciate it. Thanks!

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• Delay NTP Initialisation, Cisco 877W, IOS 12.4(24)T1

  - by Mike Insch

  I have a Cisco 877W which I'm using for my home ADSL connection (and as a refresher in Cisco IOS). I've got a working config in-place with my PPPoA connection coming online correctly, and VLANs and other settings configured as I want them, but I can't crack the NTP configuration. For NTP, I have the following defined ntp server 0.uk.pool.ntp.org source Dialer0 ntp server 1.uk.pool.ntp.org source Dialer0 ntp server 2.uk.pool.ntp.org source Dialer0 ntp server 3.uk.pool.ntp.org source Dialer0 This setup works fine when issued in Global Configuration Mode when the Dialer0 interface (ATM0.1) is up. The configuration fails at startup though: Translating "1.uk.pool.ntp.org"...domain server (208.67.222.222) (208.67.220.220) ntp server 1.uk.pool.ntp.org source Dialer0 ^ % Invalid input detected at "^" marker. This is repeated for the other servers defined. Obviously the DNS lookup for the server(s) fails because the DNS servers cannot be accessed because the external interface is not yet online. Is there a way to delay the NTP configuration until afte the Dialer0 interface is fully initialised? Can the NTP commands be triggered by the Line Protocol on the Dialer0 interface transitioning to the up state? Alternatively, can the NTP commands be delayed for 5 minutes after the router has finished initialising? Any advice, or pointers to useful documentation or examples gratefully received ...

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• Windows clients unable to access Samba share on AD joined Linux box every 7 days

  - by Hassle2

  The problem: Every 7 days, 2 Windows Servers are unable to access a SMB/CIFS share. It will start working after a handful of hours. The environment: OpenFiler Linux box joined to 2003 AD Domain Foreground app on Win2003 server access the SMB/CIFS share with windows credentials Another process on Win2008 access the share via SQL Server with windows credentials The Samba version on the Linux box is 3.4.5. Security is set to ADS wbinfo and getent return back expected users and groups Does not look to be a double hop issue as it's always the 2 accounts, regardless of the calling user. There is a DNS entry in both forward and reverse lookup zone for the linux box The linux box's computer object in active directory shows that it was modified around/at the same time that the two clients started failing to access the share Trying to access the share via IP works when by name does not Rebooting the Windows server takes care of it (it's production and only restarted it once) Restarting smbd, winbind, nmbd had no effect Error in samba log for the client in question: smbd/sesssetup.c:342(reply_spnego_kerberos) Failed to verify incoming ticket with error NT_STATUS_LOGON_FAILURE! The Question: Does this look like the machine account password is changing (hence the AD object showing the updated modified date) or are the two windows clients unable to request a new ticket that works against this linux box?

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• DNS, subdomain, and IPv6 -- possible to add subdomain.example.com NS record to an IPv6 host?

  - by mpbloch

  example.com is listed with a registrar -- specifically, answerable.com. I want to host a subdomain in-house, specifically home.example.com. I am using an ipv6 gateway, specifically gogo6, to have a public IPv6 address. The IP address looks like 2001:xxxx:xx47. Then http://[2001:xxxx:xx47] goes to my test site (an instance of IIS7). I can add a quad-A record for my primary site -- home.example.com AAAA 2001:xxxx:xx47. Then http//home.example.com loads correctly. Must I add an A or quad-A record for all sub.home.example.com to my answerable.com DNS manager for example.com? Or can I delegate DNS queries to *.home.example.com to the machine at [2001:xxxx:xx47]? I have tried to add a AAAA record for tunnel.example.com to [2001:xxxx:xx47], and then add an NS entry for home.example.com to tunnel.example.com, but browsing then results in "DNS lookup error" from my browser. Is this a configurable scenario? Can DNS for subdomain only be delegated to IPv4 addresses?

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• Unable to get squid working for remote users

  - by Sean

  I am trying to setup squid 3.2.4, but I have not been able to get it working for remote users. Works fine locally. Unable to figure out what I am doing wrong... http_port 3128 transparent ssl-bump generate-host-certificates=on dynamic_cert_mem_cache_size=4MB cert=/usr/share/ssl-cert/myCA.pem refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern . 0 20% 4320 acl localnet src 10.0.0.0/8 # RFC 1918 possible internal network acl localnet src 172.16.0.0/12 # RFC 1918 possible internal network acl localnet src 192.168.0.0/16 # RFC 1918 possible internal network acl localnet src fc00::/7 # RFC 4193 local private network range acl localnet src fe80::/10 # RFC 4291 link-local (directly plugged) machines acl SSL_ports port 443 acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 # https acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port 280 # http-mgmt acl Safe_ports port 488 # gss-http acl Safe_ports port 591 # filemaker acl Safe_ports port 777 # multiling http acl CONNECT method CONNECT http_access allow manager localhost http_access deny manager http_access deny !Safe_ports http_access allow localhost http_access allow localnet http_access allow all cache deny all via off forwarded_for off header_access From deny all header_access Server deny all header_access WWW-Authenticate deny all header_access Link deny all header_access Cache-Control deny all header_access Proxy-Connection deny all header_access X-Cache deny all header_access X-Cache-Lookup deny all header_access Via deny all header_access Forwarded-For deny all header_access X-Forwarded-For deny all header_access Pragma deny all header_access Keep-Alive deny all acl ip1 localip 1.1.1.90 acl ip2 localip 1.1.1.91 acl ip3 localip 1.1.1.92 acl ip4 localip 1.1.1.93 acl ip5 localip 1.1.1.94 tcp_outgoing_address 1.1.1.90 ip1 tcp_outgoing_address 1.1.1.91 ip2 tcp_outgoing_address 1.1.1.92 ip3 tcp_outgoing_address 1.1.1.93 ip4 tcp_outgoing_address 1.1.1.94 ip5 tcp_outgoing_address 1.1.1.90

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• Possible DNS issue after a reinstall of Windows Server 2000 (get off my lawn)

  - by cop1152

  I just replaced a drive on a Win2000 Server that replicates AD and issues out DHCP at one of our offices. I successfully joined it to the domain, setup range of IP's, etc, but am still having issues. I cannot RDC to it with name or IP. I can ping it, browse to it with Windows Explorer, and remote to it with some other software, but not RDC. The other issue is this: Users are unable to authenticate on it. They receive the message 'username or password incorrect' (or something like that). Changes made on the main domain controller seem to take forever to trickle down. The most significant entry in the DNS Server Log is Event ID 7062: The DNS Server Encountered a Packet Addressed to Itself. At least, I think its significant. The Directory Services Log shows numerous Event IDs 1265: The attempt to establish a replication link with parameters failed with the following status: The DSA operation is unable to proceed because of a DNS lookup failure. Does this make any sense to anyone? I feel like its something very simple that I am overlooking. Thanks in advance.

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• Firefox is very slow when establish SSL sessions

  - by yanglei

  Using wireshark, I discovered that Firefox v3.0 gets stuck every time before "client key exchange, change cipher spec" stage when establishing a SSL session. Specifically, it takes 0.8~1.8 second before Firefox send "Client Key Exchange" request. This is unacceptable since our application is HTTPS only. I tested this on IE6 and IE8, both works well. Any clues? [Update] Finally, I found the reason of 1 ~ 2 seconds stuck by displaying all captured packets in Wireshark. After the "server hello" stage, Firefox makes a request to ocsp.verisign.com combined with an additional DNS lookup for that domain. Firefox must wait the revocation status from OCSP before entering the next stage of SSL. Depends on whether DNS cache is in effect, this process takes 1 ~ 2 seconds. A interesting observation is that the IP packet contains "client key exchange" has a high possibility to get lost and thus a TCP retransmission is necessary. When this happens, the process can take 3 seconds at worst. I'm not sure if this is a coincidence or a bug. Anyway, here is the result from Wireshark: (delta-time) 0.369296 src-ip dst-ip TCP [ACK] Seq=161 Ack=2741 Win=65340 Len=0 2.538835 src-ip dst-ip TLSv1 Client Key Exchange, Change Cipher Spec, Finished 2.987034 src-ip dst-ip TLSv1 [TCP Retransmission] Client Key Exchange, Change Cipher Spec, Finished The difference between Firefox and IE is this: Firefox 3 enables OCSP checking by default where as IE only supports it. So, there is no problem with both IE6 and IE8. This is indeed a "certificate revoke" problem. Thanks

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• Setting up Red Hat Enterprise Linux Server as a mail exchange server

  - by Syedur

  I am a Unix/Linux/Windows Server noob. So, keep that in mind before you throw your stones at my glass house. :P I have a Windows Server 2008 R2 machine that's acting as domain controller, Server A. It's also running a DNS server. I have a Red Hat Enterprise Linux Server 5.3, Server B that is intended for mail server. In order for the mail delivery to happen, I understand that I have to set an MX record on Server A and point it to Server B. Well, I did. I manually added a host name on Server A and pointed to Server B's IP address. Then I added an MX record and pointed it to the host name. That didn't do the trick. After taking the above steps, I used the "dig" command on Server B to lookup the MX record coming back from Server A and it wasn't what I was expecting. What am I doing wrong here? I have noticed that... my Windows machines that are joined to the domain (Server A) are listed under the host names. The machines that are not joined to the domain are not list. This is fine, I am not worried about this. What does concern me, do I have to join the Server B to domain in order for Server A to recognize as a valid host and forward the MX properly? If so, some simple steps on how to join Server B to the domain would also help.

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• What is the correct mail set up for multiple domains on one server?

  - by newmarc

  I have a machine (centos 5) with one external ip address. On that machine I have many virtual hosts with a few different top level domain names and sub-domains under those eg. sub1.domain1.com sub2.domain1.com sub3.domain1.com sub1.domain2.com sub2.domain2.com sub1.domain3.com And so on... Alot of these different sites need to send mail as their corresponding domain (or second-level domain at least). I need to set up DKIM, SPF (but that's handled on the DNS) and rDNS lookup so the mail gets received. As I understand it, you can only have one rDNS entry per machine. I could set up a server for each top level domain, but I'm thinking that'll get expensive. What should I do here? Is there a way to have multiple rDNS lookups on one ip address? How do I setup DKIM signing for multiple domain names on the one machine? Are there any services out there that could handle this for me? Thanks for your help...

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• Uninstall Perl 5.10 and Install 5.8 on Ubuntu 10.04

  - by user48848

  I was using Ubuntu 8.04 with installed Perl 5.8.8. I had installed Bugzilla 3.4.4 with some custom scripts and it was working fine. I had to upgrade Ubuntu from 8.04 to 10.04 and automatically Perl is also upgraded from Perl 5.8 to 5.10. Now, accessing Bugzilla displays an error message related to Perl module. While trying to run checksetup.pl, I am getting the following error message: root@cvsnew:/var/www/bugzilla-3.4# perl checksetup.pl * This is Bugzilla 3.4.3 on perl 5.10.1 * Running on Linux 2.6.32-24-generic-pae #39-Ubuntu SMP Wed Jul 28 07:39:26 UTC 2010 Checking perl modules... Checking for CGI.pm (v3.33) ok: found v3.48 perl: symbol lookup error: lib/i486-linux-gnu-thread-multi/auto/Digest/SHA/SHA.so: undefined symbol: Perl_Tstack_sp_ptr Accessing Bugzilla throws : "500 Internal Server Error". I explored this issue and found that this issue has come up because upgrading Ubuntu upgrades Perl 5.8 to 5.10 automatically. It seems like Perl 5.10.1 isn't binary compatible with the previous. Now, I want to uninstall Perl 5.10.1 and Install Perl 5.8.8 on my Ubuntu 10.04 box. I will appreciate if someone has already done that or share the required steps/commands to do it.

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• Some Can reach bidmail.com others can't.

  - by user69426

  On a windows 7 Professional machine in Chrome one of our Estimating assistants can't get to www.bidmail.com, however the other 3 can. On his machine I did nslookup then bidmail.com and it fails to find it. I then went to a machine that could reach bidmail and did nslookup. It can't find it. I was skeptical and thought maybe it was a cached page so I cleared the cache then went back to bidmail.com was able to get to the page, login, lookup a newly posted bid then download the file. Yet I can not look it up through nslookup and I can't ping it www.bidmail.com and I can't trace it. I remoted to our other warehouse which is set up as a workgroup and attempt to nslookup bidmail and that nslookup fail... and on that machine which has never been to bidmail before it was able to connect to the website! I am totally confused if I can't ping it and I can't use nslookup to get there how in the hell is Chrome getting to the page and how do I get this guy back on? Also while typing this I took a new laptop out of the box plugged it in with no updates and can get to bidmail! omg!

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• Cache updates when migrating DNS from one provider to another

  - by JohnCC

  This may be a Windows DNS specific question or a general DNS best practice question - I'm not sure! We migrated our 3rd party DNS provision from provider A to provider B. I noticed that our internal recursive windows DNS servers still had NS records cached for our domains pointing to provider A's servers, even though I changed the nameservers with our registrar several days ago, and even though selecting the properties of the cached records showed a TTL of 1 day. After 24 hours when the NS records in this cache have expired, will the DNS server go back to the TLD server for an update on the authority, or will it go by preference to dns1.providera.com since that is what it has cached? In this case I arranged to leave Provider A's servers up for a week to allow changes to propagate, so dns1.providera.com is still active and would still provide NS and SOA records that said that dns1.providera.com. was in charge of this domain. Given this fact, would the Windows DNS server ever go back to the TLD and pick up the authority changes, or would it just assume all was well and renew timestamps on its cached NS records? I wonder what would be the best approach to ensuring that caches pick this up. Should I:- (1) Leave Provider A's servers in place and active and wait for caches to catch up ... basically what we're doing now which seems to have issues - perhaps specifically for Windows servers, or perhaps more widely. (2) Leave Provider A's servers in place but change the NS and/or SOA information they provide to tell caches that new servers are in charge. (3) Remove Provider A's servers after 2*TTL to force remaining caches to update. The issue with (2) is that on Provider A's system I can't seem to change the NS or SOA information to anything other than their servers. The issue with (3) is that I'm not sure how a DNS server would behave in this case. When it couldn't reach the cached name servers, would it flush its cache and try a full recursive lookup, or would it just return an error, forcing the user to clear the cache manually? Thanks in advance!

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• Cannot access domain from windows 2003 client

  - by Peuge

  Hey all, First off I am a novice at AD and DNS so please bear with me. This is my current situation: I have one server which is a DC and DNS server (win2k3) - Machine 1. I have another machine which is trying to join this domain - Machine2. This machine is also a win2k3 server. This is what I have done so far: I have setup DNS on the DC and its tcp/ip dns is pointing to itself. On machine2 I have set its dns to point to the dc. The DNS has been setup with a forward lookup zone with the same name as the domain (accdirect.com). I can ping machine1 from the machine2 by its FQDN and ip. I have set up forwarders on the DC for our ISP dns and can browse the internet on both machines. In the DNS mmc on the DC I can see a host (A) has been created for machine2. The problem is I still cannot join the domain. When I try join the domain via my computer - properties then it brings up the username/password box and after I go "ok" it says cannot find domain accdirect.com If I run this from machine2 dcdiag /s:accdirect.com /u:accdirect.com\admin /p: then I get the following: Performing initial setup: ** Warning: could not confirm the identity of this server in the directory versus the names returned by DNS servers. If there are problems accessing this directory server then you may need to check that this server is correctly registered with DNS [accdirect.com] Directory Binding Error 1722: Win32 Error 1722 This may limit some of the tests that can be performed. Done gathering initial info. On the dc all dcdiag and netdiag results pass. If anyone could help me I would really appreciate this! Sorry if any of my terminology is a bit off, I have only been doing this for two days. thanks Peuge

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• Error regarding DNS - "... must be able to resolve names ..." (Windows Server 2008 R2 installation)

  - by Scolytus

  I'm trying to replace our old Windows 2000 Server by a Windows Server 2008 R2. I followed the guide at MSDN. Coming to the step "Install Active Directory Domain Services..." the option to install the DNS-Server was grayed-out. According to Microsoft Support I skipped the DNS Server Installation at this point. (Because of the single-label DNS name) I then installed the DNS-Server role and created a forward-lookup-zone for the domain. When running the Best Practices Analyzer of the DNS-Server role I get these two messages for both domain controllers (the old win2k and the new win 2008 R2): The DNS server [IP address] on [adapter name] must be able to resolve names in the primary DNS domain zone The DNS server [IP address] on [adapter name] must be able to resolve names in the forest root domain name zone The TechCenter articles suggest to use a proper DNS Server - that's pointless when I try to configure a proper DNS Server. How do I configure the DNS Server in a way that it resolves these zones? Or are these errors irrelevant? dcdiag /v /test:DNS Seems to run fine...

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• There's no sound on Ubuntu with an Intel HDA onboard chip and Realtek ALC1200 codec.

  - by Hanno Fietz

  For a while now, my sound has not been working in Ubuntu. It used to play OK, but after some upgrade (might have been distro upgrade to 9.10), it stopped working. I'm currently running 10.04 on an amd64 architecture. I'm using the builtin audio on a Foxconn motherboard, it's an ATI / Intel HDA chip with an Azalia controller, apparently it's using the Realtek ALC1200 codec. All the gory details here. I found a nice sound troubleshooting tutorial here, which is well-written and pretty extensive, however, I fail to look up the supported "models" for my soundcard. The troubleshooting page says to look for a section giving the codec used by your soundcard, which looks like this for me: !!HDA-Intel Codec information !!--------------------------- --startcollapse-- Codec: Realtek ALC1200 Then, I'm supposed to lookup the models for that codec in the file Documentation/ALSA-Configuration.txt in the appropriate directory of ALSA's git repository. Mine actually pointed me to a separate file, Documentation/HD-Audio-Models.txt, which, for my driver version is located here and contains no section related to ALC1200 codecs. I tried putting the driver options probe-mask=1 and model=auto in a config file for modprobe, as suggested elsewhere, but this just lead to snd-hda-intel not able to load at all anymore. I also tried installing the linux-backports-modules-alsa package for my kernel, because the description sounded promising, but that didn't change anything, either.

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• Command line solution for removing parts from a binary file?

  - by zsero

  I have a binary file and I would like to remove parts from. By removing I mean deleting those parts and thus making the file's size smaller. The parts would be between two ASCII strings. So, for example the file would look like this ........ start ABCD end ..... start EFGH end ..... start IJKL end ........... So in this file, I would like to search for strings "start" and "end" and remove the parts between them. The way I think I can do it is to lookup all the locations for "start" and "end" calculate ranges from that delete those parts Now I am using some GUI based Hex editor and I use the "Search All", "Select Range" and "Delete" commands, but I am sure it would be possible to solve it using some powerful command line hex/text editors. Do you know any solution for this problem which doesn't require using a GUI for looking up, copy & paste on clipboard, select range and delete commands but is just a few lines of command line? I am interested ini both Linux shell scripts or using some command line hex editors under Windows, or even Python scrips are welcome. Do you think it is possible to solve this problem just by a simple Regex replace? Are there any regex replace util which handles binary files well?

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• dns configuration error in plesk

  - by Karthik Malla

  I purchased a domain www.softmail.me at Godaddy.com and tried it DNS and getting lots of errors and finally change my nameservers to my server DNS i.e. NS101.VPSLAND.COM and NS202.VPSLAND.COM and created a domain in my plesk panel (Marked DNS & Mail required). After adding my domain to my plesk panel of my server I opened DNS records of that domain and found DNS records are automatically generated to my needs as following 65.75.241.26 / 24 PTR softmail.me. ftp.softmail.me. CNAME softmail.me. lists.softmail.me. CNAME softmail.me. mail.softmail.me. A 65.75.241.26 mssql.softmail.me. A 65.75.241.26 ns.softmail.me. A 65.75.241.26 sitebuilder.softmail.me. A 65.75.241.26 softmail.me. NS ns.softmail.me. softmail.me. A 65.75.241.26 softmail.me. MX (10) mail.softmail.me. webmail.softmail.me. A 65.75.241.26 www.softmail.me. CNAME softmail.me. Finally I waited for a week for I am unable to use my domain. Also in DNS lookup I cannot find any records to my Server except name servers of VPSland. Do I need to add VPSland namesevers anywhere in Plesk panel? If so where? Can anyone assist me where the mistake is?...

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• Unable to ping domain.local, but can ping server.domain.local

  - by Force Flow

  I have a single windows 2008 server running active directory, group policy, and DNS. DHCP is running from the firewall (this is because there are multiple branch locations, and each location has its own firewall supplying DHCP. But, for this problem, the server and workstation are at the same location). On an XP workstation, if I try to visit \\domain.local or ping domain.local, the workstation can't find it. A ping returns Ping request could not find host domain.local. If I try to visit \\server or \\server.domain.local or ping server or server.domain.local, I'm able to connect normally. If I ping or visit domain.local on the server, I'm able to connect normally. A-Records are in place in the DNS service for server, domain.local, and server.domain.local. A reverse lookup zone also is enabled and PTR records are in place. If I wait 20-30 minutes, I am eventually able to ping and visit domain.local--but, when attempting to ping, it takes 30 second to return an IP address. I am also unable to join a new workstation to the domain during this wait period. If I try, the error message returned is "network path not found". Is there something I'm missing?

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• centos TCP/IP connection very slow

  - by yuli chika

  I have a VSP (centos6.1 64bit) with 4gb ram. It always runs well, but in recent few days, the server become slowly. open a small css file need 22 seconds(2kb). tested in home/office/phone with (IE,chrome,safari,firefox). see in firebug networking DNS Lookup ?4?ms Connecting ?21.18?s Sending 1?ms Waiting ?115?ms Receiving ?9?ms The connection cost 21.18 seconds I have checked all the log file, there have no error. top commond, still have free memory. top - 00:23:15 up 8 days, 3:57, 1 user, load average: 3.60, 3.42, 3.83 Tasks: 221 total, 4 running, 217 sleeping, 0 stopped, 0 zombie Cpu(s): 19.3%us, 3.2%sy, 0.0%ni, 76.1%id, 1.4%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 4194304k total, 3247724k used, 946580k free, 0k buffers Swap: 0k total, 0k used, 0k free, 0k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 32357 mysql 15 0 3710m 835m 6268 S 34.5 20.4 39:14.40 mysqld 9780 apache 15 0 442m 59m 12m S 33.2 1.4 0:05.69 httpd 9842 apache 15 0 403m 26m 10m S 16.9 0.7 0:01.23 httpd 9847 apache 15 0 412m 45m 22m R 15.3 1.1 0:01.00 httpd 9834 apache 15 0 426m 46m 11m R 13.0 1.1 0:02.22 httpd 9891 apache 15 0 407m 43m 19m S 8.0 1.1 0:00.33 httpd 9845 apache 15 0 414m 51m 24m S 6.0 1.3 0:01.53 httpd 9827 apache 15 0 402m 28m 11m S 3.3 0.7 0:02.69 httpd 9768 apache 16 0 414m 51m 24m S 3.0 1.3 0:06.51 httpd 9889 root 15 0 211m 12m 8160 S 2.7 0.3 0:00.32 php 9702 apache 15 0 415m 55m 26m S 1.7 1.4 0:10.67 httpd 9844 apache 15 0 413m 47m 21m S 1.7 1.2 0:01.21 httpd 9697 apache 15 0 414m 51m 24m S 1.3 1.3 0:11.05 httpd 9778 apache 15 0 414m 53m 25m S 1.3 1.3 0:05.38 httpd 9772 apache 15 0 414m 51m 23m R 0.7 1.3 0:05.04 httpd 9823 apache 15 0 415m 50m 23m S 0.7 1.2 0:03.97 httpd 9837 apache 15 0 402m 27m 11m S 0.3 0.7 0:01.04 httpd Then, how to check where is the problem and fixed it? I haven't change and config files in these days. Thanks.

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• Windows 7 x64 wired connection problem. IP, gateway, dns assigned, can't ping. Network detected as "Network"

  - by Emil Lerch

  I am having a problem connecting to a specific wired network with my Latitude E6410 laptop. Other wired networks seem to work fine, but this one does not. I have a coworker with me with the same Intel 82577LM Gigabit Network card, and he can connect just fine. I've updated to the latest Intel drivers (11.8.75.0) and am not using Pro Set. I obtain all DHCP information just fine (IP, netmask, DNS server, default gateway). I cannot ping anything (internal or on the Internet - I tried pinging Google's public DNS servers by IP 8.8.8.8), nor can I get answers to any DNS queries through NS Lookup. Windows troubleshooting says everything is fine, but I can't get DNS responses. I've seen issues like this in the past that were related to link speed/duplex autonegotiaion failures, so I've tried manually setting link speed/duplex to all values one by one with no success. My coworker is using all default settings, so he is just using autonegotiate. Any ideas of other things to try?

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• Reverse and Forward DNS set up correctly but sometimes MapReduce job fails

  - by phodamentals

  Ever since we switched over our cluster to communicate via private interfaces and created a DNS server with correct forward and reverse lookup zones, we get this message before the M/R job runs: ERROR org.apache.hadoop.hbase.mapreduce.TableInputFormatBase - Cannot resolve the host name for /192.168.3.9 because of javax.naming.NameNotFoundException: DNS name not found [response code 3]; remaining name '9.3.168.192.in-addr.arpa' A dig and nslookup both show that the reverse and forward look-ups both get good responses with no errors from within the cluster. Shortly after these messages, the job runs...but every once in awhile we get a NPE: Exception in thread "main" java.lang.NullPointerException INFO app.insights.search.SearchIndexUpdater - at org.apache.hadoop.net.DNS.reverseDns(DNS.java:93) INFO app.insights.search.SearchIndexUpdater - at org.apache.hadoop.hbase.mapreduce.TableInputFormatBase.reverseDNS(TableInputFormatBase.java:219) INFO app.insights.search.SearchIndexUpdater - at org.apache.hadoop.hbase.mapreduce.TableInputFormatBase.getSplits(TableInputFormatBase.java:184) INFO app.insights.search.SearchIndexUpdater - at org.apache.hadoop.mapred.JobClient.writeNewSplits(JobClient.java:1063) INFO app.insights.search.SearchIndexUpdater - at org.apache.hadoop.mapred.JobClient.writeSplits(JobClient.java:1080) INFO app.insights.search.SearchIndexUpdater - at org.apache.hadoop.mapred.JobClient.access$600(JobClient.java:174) INFO app.insights.search.SearchIndexUpdater - at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:992) INFO app.insights.search.SearchIndexUpdater - at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:945) INFO app.insights.search.SearchIndexUpdater - at java.security.AccessController.doPrivileged(Native Method) INFO app.insights.search.SearchIndexUpdater - at javax.security.auth.Subject.doAs(Subject.java:415) INFO app.insights.search.SearchIndexUpdater - at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1408) INFO app.insights.search.SearchIndexUpdater - at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:945) INFO app.insights.search.SearchIndexUpdater - at org.apache.hadoop.mapreduce.Job.submit(Job.java:566) INFO app.insights.search.SearchIndexUpdater - at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:596) INFO app.insights.search.SearchIndexUpdater - at app.insights.search.correlator.comments.CommentCorrelator.main(CommentCorrelator.java:72 Does anyone else who has set-up a CDH Hadoop cluster on a private network w/DNS server get this? CDH 4.3.1 with MR1 2.0.0 and HBase 0.94.6

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• (Zywall USG 300) NAT bypassed when accessing in-house-server From LAN Via domain name

  - by mschr

  My situations is like this; i host a number of websites from within our joint network solution. On the network is basically 3 categories: the known public, registered via mac, given static dhcp lease the anonymous lan connections, given lease from specific dhcp range switches, unix hosts firewall Now, consider following hosts which are of interest 111.111.111.111 (Zywall USG 300 WAN) 192.168.1.1 (ZyWall USG 300 LAN) load balances and bw monitors plus handles NAT 192.168.1.2 (Linux www) serves mydomain1.tld and mydomain2.tld 192.168.123.123 (Random LAN client) accesses mydomain1.tld from LAN 23.234.12.253 (Random External client) accesses mydomain1.tld via WAN DNS A records are setup so that both mydomain1.tld and mydomain2.tld points to 111.111.111.111 - and the Linux www serves the http parts with VirtualHost configurations, setting up the document roots pr ServerName, this is not so interesting though.. NAT rule translates 111.111.111.111:80 to 192.168.1.2:80 (1:1 NAT) Our problem follows; When accessing http://mydomain1.tld from outside (23.234.12.253 example host) the joint network - everything is fine, zywall receives requests via port 80 and maps it to the linux host' httpd. However - once trying to go through the NAT from LAN side (in-house, 192.168.123.123 example host) then one gets filtered in the Zywall port 80 firewall. I know this only because port 443 is open for administration interface and https://mydomain1.tld prompts for zywall login. So my conclusion is, that the LAN that accesses 111.111.111.111 in fact are routed to 192.168.1.1 whilst bypassing the NAT table. I need to know how to setup NAT / Policy Route, so that LAN WAN LAN will function with proper network translations instead of doing the 'quick nameserver lookup' or whatever this might be.

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• BIND9 server types

  - by aGr

  I was configuring DNS on my server using BIND9, everything seems to work, but I have a question regarding my config file. I've ended up with this configuration in /etc/bind/named.conf.local zone "example.com" { type master; file "/etc/bind/db.example.com"; allow-transfer { 192.168.1.1; }; }; zone "1.168.192.in-addr.arpa" { type master; notify no; file "/etc/bind/db.192"; allow-transfer { 192.168.1.1; }; }; forwarders { 10.253.22.140; 10.253.22.141; }; I've read about the different type of dns server, like primary master etc. The first two parts (zone and zone) corresponds to primary dns server configuration. First record for "classic" lookup, second one for reverse. The last part (forwarders) is configuration of cache-server and contains the ISP's IP of DNS server. So all names resolved thanks to this server will be cached. Simple question: am I right? Does my description make sense? Or one server can be only either master or either cached?

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