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• Use same dns server for all (future) connections

  - by kleofas

  I'm wondering if it is possible to specify, that all connections (even future, like when using wifi at some other place (=different SSID)) will be using pre-defined DNS server When I have some (concrete) connections, I could go to IPv4 settings, and specify DNS server there (however, in case of new connection I would have to do it (and not forget it)) This may be particularly useful for some safe/filtering dns (such as opendns's 208.67.222.123 & 208.67.220.123)

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• Windows Server 2008 R2 DNS Server Intermittently Unresponsive

  - by Ablue

  Throughout the day out DNS servers (2x Win 2k8 R2 servers) are unable to respond to requests. The requests that fail are all on the .root zone that are either cached or obtained from 1 of 5 DNS servers we forward to before going to root hints. At first I thought the DNS servers we were forwarding to were flaky. So I added some more in. Currently the forwarding list looks like ISP DNS 1 OPEN DNS 1 ISP DNS 2 OPEN DNS 2 ISP DNS 3 I have tried: Turning off root hints. Set record scavenging to 7 days. Using dnscmd /config /EnableEDNSProbes 0 as per this. Packet capture at the DNS server shows that there is a lot of query responses with server failure between lan clients and the local dns server; it does not appear to be forwarding those requests. So maybe a problem with caching? Anyhow, does anything have anything I can try to get this working?

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• Random DNS Client Issue with BIND9/Windows Server 2003 DNS

  - by upkels

  Within our office, we have a local server running DNS, for internal related "domains", (e.g. .internal, .office, .lan, .vpn, etc.). Randomly, only the hosts configured with those extensions will stop resolving on the Windows-based workstations. Sometimes it'll work for a couple weeks without issue on one machine, then suddenly stop working, or it'll happen on another 15 times per day. It's completely random for all workstations. When troubleshooting, I have opened up a command prompt, and issued various nslookup commands for some of these hosts, and they resolve, however I've been told that nslookup uses different "libraries" for name resolution than other applications such as web browsers, email clients, etc. The only solution thus far, is manually restarting the Windows DNS Client on each workstation when this happens. Issuing the ipconfig /flushdns command multiple times helps every now and then, but is not successful enough to even attempt before restarting the DNS Client. I have tried two different DNS servers; BIND9, and Windows Server 2003 R2 DNS, and the behavior is the same. We have a single Netgear JGS524 switch all workstations and servers are connected to within the office, and a Linksys SR224G switch in another department with workstations attached.

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• Changing Domain Name DNS to Redirect web traffic to one server, and leave mail to original server

  - by David S

  Hi there, Ok, quite the idiot with DNS.. apart from the basics. I have a domain name hosted with a domain registrar. It seems to have full DNS control (i.e. ability to view/edit A Records, Mail etc..) We have recently setup a server at Rackspace which hosts the new website The original/existing server (where the old website still is and Mail) is on another shared hosting companies server I went to the domain name registrar, and checked out the DNS management as follows: click here to view the DNS screenshot So obviously the A Record is pointing to the actual server where the website/mail is I figure, and the CNAME is pointing (alias?) to the website url. So my question is this: If I want the web traffic portion to go to the Rackspace/new server, but keep the mail going to where it is now, what do I have to change? Also, should I even change this info at the domain registrar? the rackspace server account has full DNS which seems to suggest I can point to their nameservers and then re-direct the MX (Mail) traffic to where the mail server is? Sorry if that was a bit confusing.. obviously in need of DNS training ;) Any help very appreciated. David.

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• Disabling DNS Registration on Server 2008 R2

  - by WaldenL

  I want to tell a server 2008 R2 machine to NOT register it's IP addresses in DNS. I go into the Advanced tab on IPv4 and turn off "Register this connection's addresses in DNS" simple! But... the addresses are updated in DNS anyway! And actually the A record is eventually removed from the DNS server. I've confirmed that the checkbox is off by looking at it myself, and by checking the RegistrationEnabled registry value for that adapter. Both confirm that the registration is off. I've turned of DNS debug logging on the DNS server and I can see DNS Update requests coming from the server in question! This should not happen. What's even odder is that eventually (several hours) the A record for the server (which I added by hand!) is removed from the DNS server. I've also confirmed that scavaging is off on both DNS servers in the domain. Ideas? Edits: Per the comment: The server has static IP addresses. However, it's got two of them on one adapter. Since I'm in a VM (HyperV) environment I just spun up a second adapter and moved the second IP to the second adapter. I set the first adapter to auto-register (since that's the IP I want anyway) and the second adapter to NOT auto-register. We'll see if this is any better. Not any better. On a reboot of the server the registration was removed from DNS. Seems both cards are still contacting the server. Based on the DNS log the card that shouldn't register in DNS is registering a 'delete' request. And then the card that should register is registering an add request but that's ignored. I'm totally confused at this point.

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• Internal and External DNS from Different Servers, Same Zone

  - by Shane

  Hello All, I am either having trouble understanding how DNS works, or I am having trouble configuring my DNS correctly (either one isn't good). I am currently working with a domain, I'll call it webdomain.com, and I need to allow all of our internal users to get out to dotster to get our public DNS entries just like the rest of the world. Then, on top of that, I want to be able to supply just a few override DNS entries for testing servers and equipment that is not available publically. As an example: public.webdomain.com - should get this from dotster outside.webdomain.com - should get this from dotster as well testing.webdomain.com - should get this from my internal dns controller The problem that I seem to be running into at every turn is that if I have an internal DNS controller that contains a zone for webdomain.com then I can get my specified internal entries but never get anything from the public DNS server. This holds true regardless of the type of DNS server I use also--I have tried both a Linux Bind9 and a Windows 2008 Domain Controller. I guess my big question is: am I being unreasonable to think that a system should be able to check my specified internal DNS and in the case where a requested entry doesn't exist it should fail over to the specified public dns server -OR- is this just not the way DNS works and I am lost in the sauce? It seems like it should be as simple as telling my internal DNS server to forward any requests that it can't fulfill to dotster, but that doesn't seem to work. Could this be a firewall issue? Thanks in advance

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• How to Configure Windows Machine to Allow File Sharing with DNS Alias

  - by Michael Ferrante

  I have not seen a single article posted anywhere online that brings together all the settings one would need to do to make this work properly on Windows, so I thought I would post it here. To facilitate failover schemes, a common technique is to use DNS CNAME records (DNS Aliases) for different machine roles. Then instead of changing the Windows computername of the actual machine name, one can switch a DNS record to point to a new host. This can work on Microsoft Windows machines, but to make it work with file sharing the following configuration steps need to be taken. Outline The Problem The Solution Allowing other machines to use filesharing via the DNS Alias (DisableStrictNameChecking) Allowing server machine to use filesharing with itself via the DNS Alias (BackConnectionHostNames) Providing browse capabilities for multiple NetBIOS names (OptionalNames) Register the Kerberos service principal names (SPNs) for other Windows functions like Printing (setspn) References 1. The Problem On Windows machines, file sharing can work via the computer name, with or without full qualification, or by the IP Address. By default, however, filesharing will not work with arbitrary DNS aliases. To enable filesharing and other Windows services to work with DNS aliases, you must make registry changes as detailed below and reboot the machine. 2. The Solution Allowing other machines to use filesharing via the DNS Alias (DisableStrictNameChecking) This change alone will allow other machines on the network to connect to the machine using any arbitrary hostname. (However this change will not allow a machine to connect to itself via a hostname, see BackConnectionHostNames below). Edit the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters and add a value DisableStrictNameChecking of type DWORD set to 1. Allowing server machine to use filesharing with itself via the DNS Alias (BackConnectionHostNames) This change is necessary for a DNS alias to work with filesharing from a machine to find itself. This creates the Local Security Authority host names that can be referenced in an NTLM authentication request. To do this, follow these steps for all the nodes on the client computer: To the registry subkey HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0, add new Multi-String Value BackConnectionHostNames In the Value data box, type the CNAME or the DNS alias, that is used for the local shares on the computer, and then click OK. Note: Type each host name on a separate line. Providing browse capabilities for multiple NetBIOS names (OptionalNames) Allows ability to see the network alias in the network browse list. Edit the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters and add a value OptionalNames of type Multi-String Add in a newline delimited list of names that should be registered under the NetBIOS browse entries Names should match NetBIOS conventions (i.e. not FQDN, just hostname) Register the Kerberos service principal names (SPNs) for other Windows functions like Printing (setspn) NOTE: Should not need to do this for basic functions to work, documented here for completeness. We had one situation in which the DNS alias was not working because there was an old SPN record interfering, so if other steps aren't working check if there are any stray SPN records. You must register the Kerberos service principal names (SPNs), the host name, and the fully-qualified domain name (FQDN) for all the new DNS alias (CNAME) records. If you do not do this, a Kerberos ticket request for a DNS alias (CNAME) record may fail and return the error code KDC_ERR_S_SPRINCIPAL_UNKNOWN. To view the Kerberos SPNs for the new DNS alias records, use the Setspn command-line tool (setspn.exe). The Setspn tool is included in Windows Server 2003 Support Tools. You can install Windows Server 2003 Support Tools from the Support\Tools folder of the Windows Server 2003 startup disk. How to use the tool to list all records for a computername: setspn -L computername To register the SPN for the DNS alias (CNAME) records, use the Setspn tool with the following syntax: setspn -A host/your_ALIAS_name computername setspn -A host/your_ALIAS_name.company.com computername 3. References All the Microsoft references work via: http://support.microsoft.com/kb/ Connecting to SMB share on a Windows 2000-based computer or a Windows Server 2003-based computer may not work with an alias name Covers the basics of making file sharing work properly with DNS alias records from other computers to the server computer. KB281308 Error message when you try to access a server locally by using its FQDN or its CNAME alias after you install Windows Server 2003 Service Pack 1: "Access denied" or "No network provider accepted the given network path" Covers how to make the DNS alias work with file sharing from the file server itself. KB926642 How to consolidate print servers by using DNS alias (CNAME) records in Windows Server 2003 and in Windows 2000 Server Covers more complex scenarios in which records in Active Directory may need to be updated for certain services to work properly and for browsing for such services to work properly, how to register the Kerberos service principal names (SPNs). KB870911 Distributed File System update to support consolidation roots in Windows Server 2003 Covers even more complex scenarios with DFS (discusses OptionalNames). KB829885

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• DNS entries for OCS 2007 R2 basic deploy

  - by Anero

  I'm doing a test deploy on a Lab with 3 VMs: TEST-DC: DC / DHCP / DNS / Root CA (Joined to TEST.AD Domain) TEST-CS: OCS Front End (Joined to TEST.AD Domain - IP: 10.0.128.1) TEST-EDGES: OCS Edge Server (Joined to Workgroup: EDGE-WKG - Internal IP: 10.0.128.3, External IPs: 192.168.129.12 - Access Edge Server, 192.168.129.13 - Web Conferencing, 192.168.129.14 - A/V) I can login with the Communicator Client from within computers in the domain (using [email protected]) and even the Automatic Sign-In works as expected. Nevertheless, I cannot login neither from within machines in the domain nor from outside the domain using [email protected]. I'm pretty sure it is a DNS related issue, so I'm including below a list of the entries. DNS Entries on TEST-DC: Forward Lookup Zones TEST.AD sip.test.ad (Host A). IP Address: 10.0.128.1 sipinternal.test.ad (Host A). IP Address: 10.0.128.1 sipexternal.test.ad (Host A). IP Address: 10.0.128.3 _sipinternaltls._tcp.test.ad (Service Location SRV). Port: 5061. Host: sipinternal.test.ad _sipinternal._tcp.test.ad (Service Location SRV). Port: 5061. Host: sipinternal.test.ad _sip._tcp.test.ad (Service Location SRV). Port: 5061. Host: sipexternal.test.ad _sipfederationtls._tcp.test.ad (Service Location SRV). Port: 5061. Host: sipexternal.test.ad _sip._tls.test.ad (Service Location SRV). Port: 443. Host: sipexternal.test.ad TEST.COM sip.test.com (Host A). IP Address: 10.0.128.1 sipinternal.test.com (Host A). IP Address: 10.0.128.1 sipexternal.test.com (Host A). IP Address: 10.0.128.3 _sipinternaltls._tcp.test.com (Service Location SRV). Port: 5061. Host: sipinternal.test.com _sipinternal._tcp.test.com (Service Location SRV). Port: 5061. Host: sipinternal.test.com _sip._tcp.test.com (Service Location SRV). Port: 5061. Host: sipexternal.test.com _sip._tls.test.ad (Service Location SRV). Port: 443. Host: sipexternal.test.ad Validation Errors OCS Front End Edge Server I ran the OCS 2007 Automatic Sign-In Troubleshooting and all DNS entries for both TEST.AD and TEST.COM are reported to be OK. What am I missing?

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• Some DHCP clients end up with wrong DNS server

  - by Nic Waller

  The scenario: DC running Windows Server 2008 R2 providing DNS + DHCP Cisco 1811 Router as the gateway 30 Windows XP DHCP clients on the LAN The problem: Some workstations are spontaneously switching to an incorrect DNS server. Specifically, ipconfig /all shows that they start using the gateway as a DNS server. This happens about 5-10 times a day to various computers, sometimes more than once per day. The workaround: Repairing the connection on the XP client always fixes the problem, and the correct DNS server address is obtained. We lost our main DNS/DHCP machine a week ago, and had to bring this one online as a spare. We've been having this issue since then. DHCP leases on the old and new servers are configured for "wired" (8 day) duration. There are definitely no other DHCP servers active on the LAN. So far there is no discernible pattern about which clients will show this problem, or when. When I ran DCDIAG /test:DNS it came back clean. Manual inspection of the DNS zone shows that all the records are appearing as expected, with no traces of the previous machine in there. Update Feb 27: Added screenshots. Here is a screenshot of the DHCP scope options on the 2008 R2 server. And here is a screenshot of ipconfig /all running on a healthy host. I don't have any ailing hosts at the moment, but will grab a screencap next time it happens. Update Feb 28: More screenshots. Here's a screenshot of DHCP and DNS traffic from a healthy client when repairing the local area connection. There's definitely only one server responding, but it does seem strange that the negotiation takes place twice. I'll try to get a similar capture from a sick machine this coming week. Update Mar 01: Caught a bad ipconfig. Here's a screenshot of ipconfig /all from a client that had this issue. It says the lease was issued this morning, but it doesn't even have an entry for the secondary DNS I set up yesterday. Both DNS servers were discovered properly when repairing the connection. Update Mar 01: It even got the sysadmin! This issue finally affected my personal workstation this morning. Unfortunately I had just rebooted and wasn't running a packet dump at the time. I set up a secondary server yesterday, and was logging all DNS traffic to it. My machine had not contacted the secondary DNS in over half an hour, so that says to me that it's just spontaneously reverting to the gateway without even failing over to secondary DNS first. Today I swapped the order of the DNS servers in DHCP, so the secondary is primary and vice versa. I will update again once I know how that goes.

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• Is there a reason to use internal DNS over 8.8.8.8 ?

  - by skylarking

  I've inherited a LAN where there is really no name resolution being done for local resources... i.e. all users enter IP addresses manually to access printers and network shares. There are no LDAP servers or domains either....workstations simply connect to the network without authentication. DHCP is handled via a core switch... And DNS settings are also handed out by this same core switch. Currently, the DNS assignments are as such, and in this order: 10.1.1.50 / old Pentium III Windows 2003 box running DNS service- 128 MB RAM 169.200.x.x / ISP 4.2.2.2. / the well known public one There a couple thousand clients on the LAN....and most of the activity is web browsing ( this is an educational setting ). First of all, the server seems woefully underpowered for this task...yet there is virtually no slowness when web surfing by clients.... How much horsepower should a heavily used DNS server have ? I have also heard using 4.2.2.2 is a bad idea .... since it has been so overused... Finally, wouldn't it make sense to have a robust external DNS server listed first? ( Google's 8.8.8.8 would seem to be a logical candidate )

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• How should one manager external and internal DNS servers at the same time?

  - by erotsppa

  We run a mac network here in the office. We have an internal DNS server to manage the network. Everything is resolved to a local ip (for mail.mydomain.com etc). However, we also have an external DNS server for when our users are not in the office. However, isn't it a pain to have to manage two lists? Whenever you change something you have to change another? And you can't have one be a slave of another because the ip are sometimes different (for example mail.mydomain.com would point to a local ip in local dns server but an external ip in the external dns server). Any tricks?

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• Server Admin is not allowing me to configure DNS

  - by Clinton Blackmore

  We have a Mac OS X 10.5.8 Server running DNS (and a few other services). When I connect to it (using Server Admin 10.5.3 [which comes from the Server Admin 10.5.7 tools]), and click to look at the DNS settings, all appears normal -- it shows many reverse entries and two top-level domains. However, when I select one of our domains and open the disclosure triangle, the list is empty! [There should be over a dozen entries, and the reverse entries do show up.] If I then tell it I want to add, say, an A Record to the domain, almost everything disappears -- and I am left with a list showing our two domains, one with a disclosure triangle underneath it showing a single entry, and one reverse entry to correspond to the new A record. named appears to be working fine. DNS names resolve. It appears to simply be that Server Admin is having problems with the data on the computer. No one here would have manually created a DNS entry. Now, while I think I've backed up the DNS (I backed up /var/named/, /etc/named.conf, and /etc/dns/, as mentioned here), I'm really not sure if just replacing the files would restore the DNS settings we have if things go south. I am contemplating going to settings and changing the log level from "Information" to "Debug", but 1) I am just a little concerned that it might write a bad configuration to the disk, and 2) I think it would only affect named and not Server Admin, and, so far as I can tell, named is not having a problem. (Nothing looks strange in /Library/Logs/named.log when I open it via Console/Terminal. Oddly, though, when I click on the 'log' button for DNS in Server Admin, I see no text at all, just a fully white window. When I look at one of our secondary DNS servers, I am able to see the log file through Server Admin.) This entry appears in the system log when I run Server Admin on the server: Jun 17 09:02:08 od1 Server Admin[3892]: Unexpected call to doMarkConfigurationAsDirty by 'DNS' plugin during updateConfigurationViewFromDescription It seems to occur after I've looked at DNS, look at another service, and then click back on DNS. Think that the most likely cause is a corrupt configuration file, I glanced through all the files that I backed up, and none of them is obviously gobbledygook. Here are some oddities I find when running Server Admin from a remote computer to manage the DNS. When I click to see the log file for DNS, the server starts writing messages like these to its system.log: Jun 17 09:59:04 od1 kernel[0]: Limiting open port RST response from 252 to 250 packets per second Jun 17 09:59:06 od1 kernel[0]: Limiting open port RST response from 258 to 250 packets per second This stops when I click on a different service. The inderterminate progress indicator (the spinning wheel that appears beside the "Revert" and "Save" buttons in the bottom-right corner of Server Admin) looks really strange. As far as I can tell, instead of just spinning and waiting, it is being told to start spinning repeatedly, resulting in a jerky animation. Here are some of the messages being logged on the computer running Server Admin: At startup: *** ERROR: -[GRAxes computeLayout]:1124 - plotRect height = 0.000000 <= 0.0 *** *** ERROR: -[GRChartView computeLayout]:1194 - Layout for overlay axes (0x18758f50) failed. *** (These messages don't concern me too much as they go away for a while if you delete ~/Library/Preferences/com.apple.ServerAdmin.plist). At shutdown: 2010-06-17 10:02:17.202 Server Admin[7770:10b] *** -[GroupTextField windowDidResignKey:]: unrecognized selector sent to instance 0x16e12490 More concerning are these messages: 2010-06-17 09:59:47.269 Server Admin[7770:10b] Unexpected call to doMarkConfigurationAsDirty by 'DNS' plugin during updateConfigurationViewFromDescription Server Admin(7770,0xb0453000) malloc: *** error for object 0x1c115390: double free *** set a breakpoint in malloc_error_break to debug 2010-06-17 10:01:00.795 Server Admin[7770:10b] *** -[ServiceEntry sessionHost]: unrecognized selector sent to instance 0x2af500 Any thoughts on: what the problem is how I can troubleshoot it or how to fix it? If I do need to wipe out DNS and restart, is there a good way to do this?

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• When DNS doesn't cache

  - by John Francis

  We've had some odd DNS problems over the past couple of days that I don't fully understand. Some of our DNS names stopped resolving for some of our customers due to some 'unknown' server reconfiguration at our DNS provider. The problem seemed to be intermittent i.e. stopped working and started working within a few minutes over a couple of days. I'm no expert on DNS, but I'd have expected DNS caches to prevent this sort of thing from happening - when we need to change an IP address for a DNS record, it can take 24 hours to propogate, so how can our DNS provider be breaking name resolution intermittently for our customers so easily? Shouldn't the DNS caches kick in here? We had a similar problem about a month ago when one of their nameservers 'decided to reload the DNS database from scratch' - this broke our name resolution too. Again, why didn't the caches satisfy the name resolution requests. Any guesses would be appreciated. John

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• DNS client configuration steps in Oracle Solaris 11

  - by Gurubalan

  This guide covers Quick how to configure DNS client on Solaris 11. DNS client configuration in Solaris 11 is based on SMF service rather than file based. When you configure a system as DNS client, you will be performing the following two configurations. I. DNS client setup II. Configure Name service switch to use DNS I. DNS client setup 1. Configure using SMF service network/dns/client # svccfg -s network/dns/clientsvc:/network/dns/client> setprop config/search = astring: ("test.com" "service.test.com")svc:/network/dns/client> setprop config/nameserver = net_address: (192.168.10.10 192.168.10.11)svc:/network/dns/client> exit 2.  Enable the DNS client service (when you configure it for the first time) #svccfg enable -r dns/client 3. Restart/Refresh DNS client service (It is done when there is any update to the configuration) #svccfg refresh dns/client #svccfg restart dns/client 4. Verify /etc/resolv.conf if it is updated with the changes. # more /etc/resolv.conf ## _AUTOGENERATED_FROM_SMF_V1_## WARNING: THIS FILE GENERATED FROM SMF DATA.#   DO NOT EDIT THIS FILE.  EDITS WILL BE LOST.# See resolv.conf(4) for details.search               test.com service.test.comnameserver      192.168.10.10nameserver      192.168.10.11 --- II.  Configuring Name service switch to use DNS 1. Configure using SMF service  system/name-service/switch # svccfg -s system/name-service/switchsvc:/system/name-service/switch> setprop config/host = astring: "files dns"svc:/system/name-service/switch>exit 2.  Restart/Refresh name-service/switch service #svccfg refresh name-service/switch #svccfg restart  name-service/switch 3. Verfiy host entry in /etc/nsswitch.conf  is updated with dns. # more /etc/nsswitch.conf## _AUTOGENERATED_FROM_SMF_V1_## WARNING: THIS FILE GENERATED FROM SMF DATA.#   DO NOT EDIT THIS FILE.  EDITS WILL BE LOST.# See nsswitch.conf(4) for details.passwd: filesgroup:  fileshosts:  files dnsipnodes:        files dns . --- PS: Thank you ollasi for your motivation behind the screen.

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• VirtualBox Ubuntu Server with DNS

  - by Boris Karl Schlein

  I just want to have a local server inside my VirtualBox that offers dns functionality like www.example.local = 127.0.0.1 . Host: Ubuntu 11.10, Guest: Ubuntu 10.10 On my server I can already ping www.example.local - so I configured my virtual host correctly. Question is, how can I address www.example.local from outside my VirtualBox? I searched Google and askubuntu and found dnsmasq. I installed dnsmasq on my server and followed all steps on help.ubuntu. On my host system I've set 192.168.178.91 to the list of dns servers (192.168.178.91 is the IP address of my local server which uses a bridged network adapter). Thing is, I still cannot ping (or connect to) my example.local virtual host. It gives me an unknown host response. How can I set up my DNS server correctly?

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• Dns hosting question

  - by ArthurD42

  Hi, I'm new to dns hosting and I have recently setup google apps for the 'mail.' cname record. How can I use it to display files on the www URL? ie: 'www.' cname. Or is it not possible to upload files using dns hosting only? I also have hosting elsewhere and wanted to know if I could forward the www cname to a subdirectory on that server, but not displaying the subdirectory URL publicly, rather the address bar constantly remains as the dns hosted (original) domain? Thank you!

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• ubuntu 12.04.3 - Reverse DNS issue - slow ping interval but normal ping value

  - by McArthor Lee

  i'm running ubuntu 12.04.3 x86 desktop in my corporation environment. I join the corp domain by Likewise open. But when I ping another pc, say hostname is pc-test, "ping pc-test" or "ping pc-test.domain.name" returns slow interval (about 5 seconds) but the ping value is below 1 ms. When I use "ping -n pc-test", everything works well. So I conclude this is about reverse DNS issue. how to fix this issue? many thanks! Edit: In my understanding, reverse DNS issue is related to DNS server or Wins server, not only an ubuntu issue, is this right? if I wanna fix this issue as much as possible on ubuntu but not on network servers, what to do?

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• Google Webmaster Tools, DNS Errors & HostPapa

  - by Gravy

  Received a message from Google Webmaster Tools: Over the last 24 hours, Googlebot encountered 2 errors while attempting to retrieve DNS information for your site. The overall error rate for DNS queries for your site is 40.0%. You can see more details about these errors in Webmaster Tools. Recommended action Contacted HostPapa and they deny that there is any issue with the site / server!!! Support in terms of what I can do to actually resolve this issue is non-existent!!!! The site is currently online. And I don't know much about DNS... so any advice about what I can do to resolve this problem would be much appreciated. Basically, the message from Google says that it is my webhosts fault, the message from my webhost (HostPapa) is... "Just tell google to crawl your site as there are no errors."

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• Are there any risk if your DNS's SOA or admin contact are using the same domain as the DNS

  - by Yoga

  For example, Google.com [1] The SOA email is : dns-admin.google.com The contact is: Administrative Contact: DNS Admin Google Inc. dns-admin.google.com As you can see, both are using google.com, I am thinking it is safe to use the same domain, i.e. consider the case you lost control of the domain, you can receive email also. (Of course Google is a public company so the chance is low, but might occur for smaller company that their domain might be stolen..) So, do you recommend use your the same domain as the contact or others free services such as gmail? [1] http://whois.domaintools.com/google.com

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• Slow DNS Resolution

  - by user4541

  After a clean install of 10.10 I'm finding DNS resolution takes quite a long time. Hitting any url takes a good few seconds (10 - 30) before the site is displayed. I'm thinking this is a DNS resolution issue due to the 'waiting' or 'looking up' text being displayed in Firefox and Chrome. I do not get this issue with Slackware Linux or Windows 7 so it is not network or DNS server specific issue. It's something on the client side. Looking around on Google I see there are a few other people with this issue. The ones that have reported a workaround by switching to openDNS are disabling IPV6 or dealing with another issue. Any help would be appreciated. My network card is wired: Broadcom Corporation NetLink BCM5906M Fast Ethernet PCI Express Thanks

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• Why does flush dns often fail to work?

  - by Sharen Eayrs

  C:\Windows\system32>ipconfig /flushdns Windows IP Configuration Successfully flushed the DNS Resolver Cache. C:\Windows\system32>ping beautyadmired.com Pinging beautyadmired.com [xxx.45.62.2] with 32 bytes of data: Reply from xxx.45.62.2: bytes=32 time=253ms TTL=49 Reply from xxx.45.62.2: bytes=32 time=249ms TTL=49 Reply from xxx.45.62.2: bytes=32 time=242ms TTL=49 Reply from xxx.45.62.2: bytes=32 time=258ms TTL=49 Ping statistics for xxx.45.62.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 242ms, Maximum = 258ms, Average = 250ms My site should point to xx.73.42.27 I change the name server. It's been 3 hours. It still points to xxx.45.62.2 Actually what happen after we change name server anyway? Wait for what? I already flush dns. Why it still points to the wrong IP? Also most other people that do not have the DNS cache also still go to the wrong IP

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• Redirect specific domains with DNS

  - by user66377

  Currently we filter internet content using OpenDNS, our internal Windows DC/DNS servers point to the router's DNS, which then points to the OpenDNS servers. This works well to block all computer's on the network equally. New issue. We now need to separate what computers can go to what sites. So facebook is blocked for everyone right now, but I need to open it up to the 3 community computers now. The 3 community computers will be on an untrusted network seperate from the company computers so they can have their own DNS server, from their own router. The issue is though they still must connect to the internet using the same IP address. So OpenDNS sees the same IP and blocks them the same way. We are looking into getting a second IP, but it's not likely an option without going up to the next major level with our ISP which we don't want to do. My thought is this. Can I setup a DNS server on the untrusted network, and then depending on the request that comes in, have it send it to either OpenDNS or our ISP's DNS? Example www.facebook.com and www.youtube.com are both on the OpenDNS blacklist. So if they go to www.youtube.com, the local DNS server goes to the ISP's DNS to get the IP and thus the client gets the right IP and can go to the site. This would be manually entered for each allowed site thus creating a white list. Then if they go to www.facebook.com, since the local DNS server does not find an entry, it sends the request to OpenDNS, which then sees the site is on the blacklist, and thus sends the it's blocked webpage. The local DNS server can be either Bind on Linux or MS DNS on Window 2008. If this can be done, can you give some direction as well as I've never setup a DNS such as this before. Thanks

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• How to find domain registrar and DNS hosting with good DNSSEC support?

  - by rsp

  Simplified problem I want to buy a domain and make a website that is fully secured with DNSSEC. Background I've been hearing about the insecurity of DNS for years. I've watched all of the talks by Dan Kaminsky and others from DNS exploits to The future of DNS Security Panel. I knew that using DNS without security is a disaster waiting to happen. I followed the development of the DNSSEC standard. I celebrated the key signing ceremony. Everything was on the right track to finally have a secure DNS system in place. And now more than 2 years later I wanted to just do what everyone said I should do: use DNSSEC for a new domain. So I need a domain registrar and a DNS hosting service that supports DNSSEC. Surprisingly it is not that easy to even find out who does support DNSSEC. It was actually much easier to find info on DNSSEC two years ago when everyone was going to support DNSSEC Real Soon Now but now years passed and I hardly see any progress done. I just hope that I was just looking in the wrong places and someone here will explain all of the doubts. I hope that other people who want to have a secure website will also find this question useful. What is needed registrar and DNS servers with full DNSSEC support for .com domains What is not needed IPv6 support Web hosting anything more What I found out so far Go Daddy offers Premium DNS service for additional $36 per year that lets you "Secure up to 5 domains with DNSSEC". easyDNS has DNSSEC available in Beta across all service levels (you need to enable the "beta" flag in configuration) but it doesn't seem to be production ready and judging from the lack of updates it isn't a feature of highest priority (the last update from March 2011 on the easyDNS blog). Name.com - according to The Register (US domain registrar does IPv6, DNSSEC) it has DNSSEC support since 2010 but right now (October 2012) I couldn't find anything related to DNSSEC on their website. Dynadot that is very often recommended doesn't support DNSSEC Namecheap that is also often recommended doesn't support DNSSEC. The support answer from 2011 suggested that it was being added but in 2012 still no ETA is given to customers. DynDNS was supposed to support DNSSEC, I found a link explaining DNSSEC support but it gives 404 Not Found page and offers a search box - when searching for DNSSEC I get "No results were found for your query." GKG was recommended online for DNSSEC support but it's hard to find any information on the level of DNSSEC support - there is a brief explanation on what is DNSSEC and how to sign Delegation Signer records in their FAQ but no information about the level of actual support can be found. Ask Slashdot: Which Registrars Support DNSSEC? from July 2011 - Answers list Go Daddy, DynDNS, GKG, Name.com as registrars that support DNSSEC but: see above. Related questions How to find web hosting that meets my requirements? What is needed to add DNSSEC to my site? DNS hosting better managed by Domain provider or Hosting provider? Registrar with good security, DNS hosting, and DNSSEC and IPv6 resolvers? In no. 1 no one is ever mentioning DNS at all. In no. 2 answers only mention the .se TLD, there are very few answers and they seem very outdated. In no. 3 one answer says "On projects that demand higher security, I might look for a web host that supports DNSSEC" but no more information is provided. The only relevant answers are in no. 4 where easyDNS is recommended by someone who has never used them personally. Meanwhile, as of October 2012, the support of DNSSEC is described as "in beta" on the easyDNS feature list. Another one recommends SiteGround but searching their site for DNSSEC returns no results. Other answers recommend web hosting providers that don't meet the requirement of DNSSEC support. Also the question mentioned above lists 9 very specific requirements other than only DNSSEC (like eg. HTTP-only login cookies, two-factor authentications, no DNS record limits, DNS statistics of queries/day, audit trails etc.) which might have excluded many possible recommendations if one is only interested in DNSSEC support. Conclusions I thought that by the end of 2012 the support of DNSSEC among domain registrars and DNS providers would be nearly universal. I am shocked that the support seems virtually nonexistent. Is this a result of some serious problems with the DNSSEC adoption? Or is it just not a hot topic and no one bothers anymore? According to the DNSSEC Scoreboard roughly about 0.1% of .com domains support DNSSEC. Could that be caused by the lack of DNSSEC support among registrars and DNS providers, is the information too hard to find or maybe no one cares? There is even no "dnssec" tag here. Questions The information is surprisingly hard to find. That is why I am asking for first-hand experience and personal recommendations. Has anyone here actually set up a website with DNSSEC, from the domain registration to the configuration of DNS servers? Can anyone recommend any of the registrars mentioned above? Can anyone recommend any registrar not mentioned above?

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• Best Practise: DNS and VPN (with private network IPs)

  - by ribx

  I am trying to find the best solution for my DNS problem. We are running several services in our company that you can reach only over VPN. Other services, that are reachable through the internet got the domain ... At the moment all services inside the VPN network go by .local... These have an VPN IP of the private network 192.168.252.0/24. Clients reach from Linux over OSX to Windows. I can think of 4 possibilities to implement a DNS infrastructure: Most common: an internal DNS Server, that is pushed by the VPN. But this has several drawbacks: your DNS responses are limited to the speed of the VPN Connection and your own DNS server. Because of very complex websites, this can increase the time for a page to load quite a lot. Also: we have several VPNs that are not connected to each other and all of them have their own DNS server. Several DNS servers locally. These have to be configured by hand. And you have to use some third party tool like dnsmasq. If you start a DNS request, you ask your locally running DNS server, which decides which server to ask for which domain name. One college of mine uses such a solution with this OSX (I am sorry, I don't remember the name of the application). You use your domain hoster. Most of them have APIs available to manipulate your DNS entries. So you could pull your private network informations to your domain hoster. I am not sure whether they all accept private network IPs. But I guess there will be some problems in the same way as in number 4. The one we currently use, because it's for us the most logical choice: we forward the sub domain *.local.. to our own public DNS Server. This works quite good for some public DNS Servers like Google. But most ISPs do not forward the answers. Or don't do that always. Like my ISP sends me a positive result of the a DNS request of a *.local.. domain only every 10th time I make a nslookup. (Can someone explain this?) Here the real Question: Is there another solution we were not thinking about? Or: What of these methods do you use?

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• DHCP and DNS services configuration for VOIP system, windows domain, etc

  - by Stemen

  My company has numerous physical offices (for purposes of this discussion, 15 buildings). Some of them are well-connected to our primary data center via fiber. Others will be connected to the data center by P2P T1. We are in the beginning stages of implementing an Avaya VOIP telephone system, and we will be replacing a significant portion of our network infrastructure in the process. In tandem with the phone system implementation, we are going to be re-addressing some of our networks, and consolidating most of our Windows domains into one (not all domains, just most). We currently have quite a few Windows domains, and they of course each have their own DNS zones. A few of those networks currently use DHCP, but the majority use static IP assignments for every device. I'm tired of managing static assignments -- I want to use DHCP configuration on everything except servers. Printers and etc will have DHCP reservations. The new IP phones will need to get IP addresses from DHCP, though they need to be in a separate VLAN from the computers/printers/etc. The computers and printers need to be registered in DNS. That's currently handled by the Windows DHCP servers on each of the respective domains. We need to place a priority on DHCP and DNS being available on a per-site basis (in case something were to interrupt the WAN connection) for computers and (primarily) phones. Smaller locations (which will have IP phones but not be a member of any Windows domain) will not have any Windows DNS/DHCP server(s) available. We also are looking for the easiest way to replace a part if it were to fail. That is to say, if a server/appliance/router hosting DHCP were to crash hard, and we couldn't extremely quickly recover the DHCP reservations and leases (and subsequently restore them onto a cold spare), we anticipate that bad things could happen. What is the best idea for how to re-implement DNS and DHCP keeping all of the above in mind? Some thoughts that have been raised (by myself or my coworkers): Use Windows DNS and DHCP servers, where they exist, and use IP helpers to route DHCP requests to some other Windows server if necessary. May not be acceptable if the WAN goes down and clients don't get a DHCP response. Use Windows DNS (everywhere, over WAN in some cases) and a mix of Windows DHCP and DHCP provided by Cisco routers. Every site would be covered for DHCP, but from what I've read, Cisco routers can't handle dynamic registration of DHCP clients to Windows DNS servers, which might create a problem where Cisco routers are used for DHCP. Use Windows DNS (everywhere, over WAN in some cases) and a mix of Windows DHCP and DHCP provided by some service running on an extremely low-price linux server. Is there any such software that would allow DHCP leases granted by these linux boxes to be dynamically registered on the Windows DNS servers? Come up with a Linux solution for both DNS and DHCP, and deploy low-price linux servers to every site. Requirements would be that the DNS zone be multi-master (like Windows DNS integrated with Active Directory), that DHCP be able to make dynamic DNS registrations in that zone, for every lease (where a hostname is provided and is thus possible), and that multiple servers be either authoritative for the same DHCP scope or at least receiving a real-time copy / replication / sync of the leases table so that if one server dies, we still know which MAC has what address. Purchase dedicated DNS/DHCP appliances, deploying to all sites. From what I read/see, this solves all of our technical problems. Then come the financial problems... I don't have a ton of money to spend on this. Or, some other solution that we've thus far overlooked and will consider upon recommendation. Can Cisco routers or Windows servers sync DHCP lease tables so that multiple servers can be authoritative (or active/passive for all I care) for the same scope, in case one of the partners were to fail? I've read online (repeatedly) that ISC's DHCP is able to maintain the same lease table across multiple servers, in order to solve this problem. Does anyone have any experience or advice to regarding that?

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