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• 27 days after domain transfer name servers not propogated

  - by Thom Seddon

  We recently bought the domain: embarrassingnightclubphotos.com 7 days after accepting the transfer the domain finally transferred to our registrar and we immediately changed the name servers from ns*.netregistry.net to amy.ns.cloudflare.com and cody.ns.cloudflare.com 20 days after changing the name servers, the majority of tests show that both old and new nameservers are still being reported: http://intodns.com/embarrassingnightclubphotos.com http://www.whatsmydns.net/#NS/embarrassingnightclubphotos.com We are now ready to launch the new site but this issue is plagueing us as a high proportion of the traffic is still receiving the old nameserves and so hitting the old server. You can tell if you have hit the old or new server as the old server has the value "A" for the meta tag "Location" and the new server has "U". (The old server just has an iframe too!) I have never had this problem before - who is causing this and how should we go about reaching a resolution? Thanks

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• Multiple servers using same nameservers

  - by Robsimm

  I have 2x servers with the following OS's and Control Panels: Windows Server 2003 running Plesk 9 Centos 5.3 running WHM/cPanel The Windows server 2003 server is hosting the two nameservers: ns1.domain.com ns2.domain.com I have BIND running on the Centos 5.3 server, but I wish for my customers to use the same nameservers ns1.domain.com and ns2.domain.com (as per the Windows Server 2003 server). My first question is - is this possible? And if so, how would I go about configuring both servers to enable such a configuration? Thanks very much.

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• DNS Root-Server: Is there one Central Root-Server to query the Rootservers itself?

  - by jens

  Hello Experts, if I want to querey the DNS delegation "manually", I normally start using one of the "DNS-Root-Servers", like b.root-servers.net. dig @b.root-servers.net test.com But what if the root servers would change? My question is, is there any possibility to query a "central Server" even being "above" the root servers that returns me the list of Root servers?

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• How can I create (or do I even need to create) an alias of a DNS MX record?

  - by AKWF

  I am in the process of moving my DNS records from Network Solutions to the Amazon Route 53 service. While I know and understand a little about the basic kinds of records, I am stumped on how to create the record that will point to the MX record on Network Solutions (if I'm even saying that right). On Network Solutions I have this: Mail Servers (MX Records) Note: Mail Servers are listed in rank order myapp.net Add Sub-Domain MXMailServer(Preference) TTL inbound.myapp.net.netsolmail.net.(10) 7200 Network Solutions E-mail I have read that the payload for an MX record state that it must point to an existing A record in the DNS. Yet in the example above, that inbound.myapp... record only has the words "Network Solutions E-mail" next to it. Our email is hosted at Network Solutions. I have already created the CNAME records that look like this: mail.myapp.net 7200 mail.mycarparts.net.netsolmail.net. smtp.myapp.net 7100 smtp.mycarparts.net.netsolmail.net. Since I am only using Amazon as the DNS, do I even need to do anything with that MX record? I appreciate your help, I googled and researched this before I posted, this is my first post on webmasters although I've been on SO for a few years.

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• DNS-Based Environment Determination

  - by zvolkov

  Found the following here. The questions is: where can I find more details on how exactly implement this on Windows? Any guide or how-to anybody? Or maybe you can provide your invaluable suggestions? Specifically, how do I make so that "all QA servers would first resolve entries in qa.example.com first and then if that lookup failed they would try example.com" (I'm a dev, not a DNS specialist, but our IT Support has refused to help on this:() Use DNS Based Environment Determination for your servers. Do this by initially splitting your top level domain into a number of sub domains depending on their function, and then creating DNS Service Names in each of the sub domains pointing to the relevant server for that service. Based on the list above we would then have: * clientdb.prod.example.com for Production * clientdb.perf.example.com for Performance Testing * clientdb.qa.example.com for QA * clientdb.dev.example.com for Development Servers then resolve entries in their relevant sub domain by function. That is, all QA servers would first resolve entries in qa.example.com first and then if that lookup failed they would try example.com. This allows you to have a single configuration entry for your client database hostname (clientdb) that would resolve correctly in all environments. This technique has the added advantage of still having global services defined in a common top level domain. Here's one related (but not equivalent) SO question: http://stackoverflow.com/questions/774490/dns-resolving-based-on-client-ip This seems to be related to Providing "split horizon" DNS service. Reading that, I see that I will probably need separate DNS Server for each environment. Is this true or does Windows support some form of "tagging" the records to be visible depending on the requestor's IP? Also, cross-posted on ServerFault

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• change DNS but keep email server

  - by Oterox

  I currently have my client's website hosted in china and the domain is hosted in www.net.cn I've purchased an inmotionhosting plan and i want to move the website there. For having the website working i just need to change the DNS nameservers but i want to keep the email in the client's old server, is this possible? Currently i have this DNS: MX mxn.mxhichina.com. 5 MX mxw.mxhichina.com. 10 CNAME pop3 pop3.mxhichina.com. -- CNAME smtp smtp.mxhichina.com. -- CNAME mail mail.mxhichina.com. -- CNAME m m.mxhichina.com. -- TXT v=spf1 include:spf.m... -- A @ 223.4.215.96 -- A www 223.4.215.96 -- and in inmotionhosting i have this: example.com. 14400 IN A 216.194.168.46 localhost.example.com. 14400 IN A 127.0.0.1 mail.example.com. 14400 IN CNAME example.com www.example.com. 14400 IN CNAME example.com webmail.example.com. 14400 IN A 216.194.168.46 What do i have to change to have the website working on the new server but keeping the email server where it is right now?

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• Clicking a link in IE6 doesn't load page (internal DNS entry on our intranet)

  - by Callum

  I have a very strange problem that is only affecting some versions of IE6. The problem does affect IE 6.0.2900.5512, but does not seem to affect 6.0.3790.3959 Basically I work for a company and we have an intranet. While I'm not an expert on "internal DNS pointers", what I was able to do was create a website (let's say about football), and when an employee who is sitting behind the company firewall types the word "football" in to the web address bar of their web browser, they get redirected to a particular server. I am told this is some kind "internally pointing DNS entry". So, I've set one of these up, and I have a placed a link to it on our company intranet page. However, when the link is clicked in IE6.0.2900.5512, the page goes blank. Clicking "refresh" then loads the correct page (the one specified in the link). Can anyone help me out here. I have tried changing the way URL is formed, everything from //football to http://football/ etc. The link works fine in every other browser and IE7+, but unfoturnatly, IE6 is still the most common browser in use at my organisation.

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• Read Only Domain Controllers and DNS zone updates

  - by Mike M

  I have a Windows 2003 domain and just added a new DC that runs 2008 R2. I updated the schema accordingly for both forest and domain levels. I also made sure to run /rodcprep at the time I did this. I have a branch office with a 2008 R2 file/print server that is a read-only domain controller (DC). The one problem I have been having is with AD-integrated DNS records updates. In the data center, we had to make an IP address change on a particular server. All our other sites' DCs (2003) updated the record fine. The 2008 R2 DC in the data center also updates its record fine. However, the RODC in the branch office does not. So if I nslookup the target server on a 2003 DC, the IP address is correct. Same with the 2008 R2 DC in the data center. But an nslookup on the branch office RODC still pulls in the old IP address. Moreover, any new records we've created (e.g., just added a new terminal server) do not get updated on the branch RODC either. Is there something simple I'm missing? How do I get the RODC to sync its AD-integrated DNS records with the rest of my world? Thank you in advance for your responses. Mike

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• Configuring DNS & MX records for exchange 2010

  - by Mahmoud Saleh

  i am trying to configure Exchange Server 2010 on Windows Server 2008 R2 to receive emails from the internet following the danscourses tutorials: and i followed this video for the DNS & MX records: http://www.youtube.com/watch?v=jdf_3DRssks i don't have any windows administration skills, and i am stuck with the DNS configuration. and the following are my domain configuration i got from the hosting. following are the steps i made: 1- Add new name server: add ns1.centors.com ip Exchange Server Public IP: 41.233.26.131 2- Change the A record change it to point to the public ip address Exchange Server Public IP: 41.233.26.131 3- New cname record for www and make it resolve to centors.com 4- New mx record for mail.centors.com 5- New A record for mail.centors.com: name: mail ip: Exchange Server Public IP: 41.233.26.131 6- new A record for ns1: ip: Exchange Server Public IP: 41.233.26.131 7- i made port forward in the router for SMTP and POP3 to the exchange server local ip address. ISSUE: i have a user account in the active directory, and the user is member of the domain, the user is [email protected] and when trying to login with this account in outlook 2010 on other machine using following data: account type: POP3 incoming mail server: mail.centors.com outgoing mail server: mail.centors.com i always get the error: Authorization failed, check your server settings. please advise what's wrong with the configuration, thanks in advance.

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• How to restrict zone transfers to specific authorized servers only

  - by JonoB

  I recently failed a PCI compliance scan because of the following: This DNS server allows unrestricted zone transfers. Attackers may be able to use this information to gain knowledge on the structure of your networks to aid in device discovery prior to an actual attack. And the suggested solution is as follows: Reconfigure this DNS server to restrict zone transfers to specific authorized servers only. I am running a dedicated Linux Centos server. My understanding is that I have to edit the /etc/named.conf file, which I have done and the the relevant part is as follows: options { acl "trusted" { 127.0.0.1; xxx.xxx.xxx.001; //this is one of the server's ip's xxx.xxx.xxx.002; //this is another server's ip }; allow-recursion { trusted; }; allow-notify { trusted; }; allow-transfer { trusted; }; }; I then restarted the named service /etc/rc.d/init.d/named restart and requested a re-scan, which failed again for the same reason. Am I missing something obvious here?

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• postfix concurrency limit with round robin dns

  - by goose

  Take the following internal round robin dns setup mymta.com. IN A 172.31.1.1 mymta.com. IN A 172.31.1.2 mymta.com. IN A 172.31.1.3 mymta.com. IN A 172.31.1.4 mymta.com. IN A 172.31.1.5 mymta.com. IN A 172.31.1.6 mymta.com. IN A 172.31.1.7 mymta.com. IN A 172.31.1.8 mymta.com. IN A 172.31.1.9 mymta.com. IN A 172.31.1.10 Now assume the following postfix setup (assume these are the only tweaks from defaults in debian package) main.cf: smtp_connection_cache_destinations = mymta.com smtp_connection_cache_reuse_limit = 750 smtp_destination_concurrency_limit = 75 transport * :[mymta.com] I would expect 75 concurrent connections spread across the 10 A records I've set in DNS. However I'm seeing more than a few hundred connections to mymta.com and I'm wondering if Postfix is "smart" enough to set up 75 concurrent connections for each IP address. Thoughts?

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• Widespread misinterpretation of DNS rules in resolving wildcards

  - by Dominic Sayers

  [EDITED to add: This problem has gone away on its own. I believe Cloudflare's name resolution may have been to blame. See my own answer below] Here is a snippet of my zone file *.example.com. 300 IN CNAME proxy.herokuapp.com. foo.example.com. 300 IN A 111.111.111.111 If I dig @8.8.8.8 foo.example.com I get the answer I expect: ;; ANSWER SECTION: foo.example.com. 30 IN A 111.111.111.111 The same is true of all other public DNS servers I've tried. However, when I try to set up a check with Pingdom to a URL on foo.example.com it instead sends the traffic to my Heroku app referenced by the *.example.com RR. The same is true of checks set up on New Relic, Errplane and traffic generated by the Heroku app itself. So on the one side, all public DNS servers interpret the zone file one way. Yet four service providers all interpret it a different way, one that differs to the standard suggested by RFC 4592. My question is: are these reputable, mature service providers all wrong? Or is it little me?

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• Internal/External Moodle - DNS

  - by Chief17

  Network diagram: I have a moodle (a VLE) setup that I want to be internally and externally accessible. The green route on the diagram below is the route I would like the traffic to take when the user is inside the LAN, and the red route is seemingly what it does take. The website has a domain name (like most websites do). From the User PC, if I ping the domain name, I get the internal IP of the webserver (because of a hosts file entry), if I nslookup the domain name I also get the internal IP of the webserver (because of an A record on my DNS server). Running the same two commands on the webserver gives me the webservers external IP. (going well so far) If I use PHPs gethostbyname() on the moodle website and use domain name as a parameter (getting php/apache to resolve the hostname) it returns the exernal IP of the webserver (good news, DNS seems to be doing what I want it to). All things so far seem to be going well. The only thing that is confusing me and preventing the moodle single sign on from working is the fact that if I get moodle to show my IP address, it says that it is an external one (outside my NATting firewall) when it should show an internal IP. This is the issue, any ideas on how to go about resolving this? Any ideas on tests I can perform (I have also tried a tracert and the request goes directly to the webserver), anything? Thanks all!

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• Which DNS settings are used when setting up your server

  - by Saif Bechan

  I have a server and want to run my own name server service. Now I have set it up already and it works not, but I do not know where the exact settings are stored. On my server I use Plesk. When I edit DNS settings there I think it is stored in named.conf. Named is installed on the server, and BIND. Now I also have a panel from my registrar. This is separate from my server. Both places I can add the normal MX,A,CNAME, etc records. Now where is the best way to place this settings. Currently I have the same records on both places, on the server and at the registrar panel. I am correct to just add all the records at the registrar panel, and remove everything from within PLESK, and just don't run DNS on my server, because it is already done in the registrar panel. Or should I add the records in both places.

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• dns in a small network with router and AD domain

  - by Felix

  I have a small office network with router (running OpenWRT), Windows Domain Controller (used to be 2008R2; I just backed it up and upgraded to 2012), about a dozen AD clients (3 server and windows workstation) and several non-AD clients (network printer, PBX). The problem is that the clients can't access servers by name (only by IP). I tried all kind of permutations. Right now domain controller runs DNS server for all desktops; but unless I put an entry in hosts file - I can only get by IP. I have router as DHCP server (since not all devices are on AD); and except for Domain Controller all IP addresses, including "static", are assigned by the router. Most frustrating, some servers sometimes just work! for example, I can often get to the Linux box by name (it is part of Domain using Beyond Trust Integration Services); but I can never get to SQL Server box. Seems like non-domain devices see more names than domain members... This network should be fairly typical; but I couldn't get any guidance about how to set up DNS/DHCP service to make all nodes happy. The closest is this question, but still it's different! Thanks

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• Problems forwarding zone to another DNS server.

  - by sebastian nielsen

  I have a authorative DNS server at 83.248.21.18 which are authorative for the domain "finahemgoteborg.se". Now my registrar is requiring me to have 2 DNS servers for the domain, so I would now want the machine 85.228.103.141 just forward all incoming queries for "finahemgoteborg.se" to the 83.248.21.18 server. In the 85.228.103.141 BIND server, I have the following config: zone "finahemgoteborg.se" in { type forward; forwarders {83.248.21.18;}; }; But the problem is that 85.228.103.141 is still responding with "REFUSED" when querying it for example www.finahemgoteborg.se A record. How can I fix it. I do NOT want to set up a master/slave situation, just one nameserver that forwards to a another. Edit The Rest of named.conf: options { directory "/var/cache/bind"; version "none"; allow-recursion {"none";}; minimal-responses no; }; zone "sebn.us.to" in{ type master; file "/etc/bind/sebn.us.to"; }; zone "ns1sebn.us.to" in{ type master; file "/etc/bind/sebn.us.to"; }; zone "ns2sebn.us.to" in{ type master; file "/etc/bind/sebn.us.to"; }; zone "finahemgoteborg.se" in{ type forward; forwarders {83.248.21.18;}; };

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• Proper DNS records for handling subdomains and missing subdomains

  - by Cerin

  I'm trying to craft DNS records to support: Explicitly defined subdomains, e.g. ftp.mydomain.com A missing subdomain that redirects to www. Implicitly defined subdomains, e.g. <some user entered value>.mydomain.com For 1, I'm using CNAME records. All seems to be working well. For 2, I'm using an A record, @ -> 123.456.789.012. Worked well. For 3, I ran into some trouble. I tried adding another A record, * -> 123.456.789.012. This appeared to work initially, but it broke #2. i.e. now browsing to mydomain.com doesn't redirect to www.mydomain.com. I tried adding the CNAME record @ -> 123.456.789.012, but my DNS admin tool won't accept it because it's saying the @ is already in use, even though I deleted the A record using it. Am I configuring this incorrectly? What am I doing wrong?

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• Unable to Connect to just Google Servers

  - by Akshat Mittal

  I am in an extremely strange problem. I am unable to connect to just Google Servers. I am not able to access any site related to Google, Google.com | YouTube | Google+ | Webmaster Tools | jQuery CDN, nothing is working. I am able to open any other website (as I am posting this question on SuperUser), even the Google DNS (8.8.8.8 and 8.8.4.4) are offline. Please Help!! Update 1: Google DNS are back online, YouTube is back online. But website on domain google.com is not working (ex: play.google.com, maps.google.com, google.com/search, etc). Update 2: I am able to access Google.com (only) with (one of) its IP addresss(s) listed below: 74.125.227.41 74.125.227.46 74.125.227.32 74.125.227.33 74.125.227.34 74.125.227.35 74.125.227.36 74.125.227.37 74.125.227.38 74.125.227.39 74.125.227.40 Update 3: I consulted my friends nearby and they said that they are also experiencing the same problem. Seams like this is a major problem in this area (or India !!) The Problem is Now Solved!! I am able to open Google.com

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• Dns - wildcard vs. cname subdomains

  - by Matthew

  Alright I have to admit I'm confused with how DNS works. I've always just added things until they worked, and now it's time to learn how they work. So one confusing thing to me is that there's sort of two places I can have records. I have an account with rackspace cloud servers. And then there's the place I registered the domain. But both allow me to edit DNS records. Should I do everything at both places or is one better than the other or am I missing the point? Subdomains confuse me too. I'd like to be able to just have a wildcard subdomain (I've done this in the past.) I just don't like the idea of adding a cname record or A record every time I need a new subdomain. Then I read this and it says: The exact rules for when a wild card will match are specified in RFC 1034, but the rules are neither intuitive nor clearly specified. This has resulted in incompatible implementations and unexpected results when they are used.

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• Router that allows custom Dynamic DNS server [closed]

  - by Thuy

  I've made my own DDNS service and it works fine using an application running on clients to update the IP. But if for some reason I don't have the choice of using my software and instead I need to use a router to update the IP, it becomes troublesome. For example, I needed to setup IPsec from a customer to me and the customers router/firewall (netgear srx5308) has a dynamic IP which is given from the ISP which can't offer static IPs. So it needs to use dynamic dns for it to work. In this case there really isn't a client to run the software on since it's a router/firewall. Unfortunately it seems that most routers are rather unfriendly towards custom DDNS solutions and most offer only dyndns.com or similar templates. Which was the case with this router too. Leaving me with no way to use my own dynamic dns server IP. I have the option of switching out the customers router and I've been looking around for alternatives and other routers/solutions and I was wondering if anyone on this great site might have been in a similar situation or might just know about some router/firewall that is more friendly towards custom ddns solutions that I might be able to use. Thanks in advance for any help or guidance!

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• SBS 2008 - DNS Forwarders timing out.

  - by Moif Murphy

  Hello, We have an SBS 2008 server that keeps losing connection to the internet approx 2-3 times a day. It's a simple setup, BT Business Broadband ADSL to a Wireless Zyxel router to the server. Clients connect via WiFi from their laptops. Plugging ethernet in makes no difference, only a reboot of the router seems to bring everything back again. I'm looking at the forwarders on the DNS properties page and they're timing out when trying to resolve the IPs. Currently there are two IPs in there, 194.72.9.34 which has timed out and 194.72.9.38 which has finally resolved to ns8.bt.net We've been in there and replaced all media, installed a PCI NIC, have changed the router three times. There are no errors in the DNS event logs pertaining to what's going on. We've also been on to BT who are adamant that it's not their end. Could someone shed some light on what could be going on or where else to look in the configuration of the server? Thank you.

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• Cant configure DNS properly on centos

  - by Nuker

  I am on a VPS i must manage my own. I have network problems because in the last days many of my users report they cant enter my site from my domain and seems like Google and Facebook cant either (this never happened before). However i can enter my site without problems and so many other people as well. So i tested by making a php include like this <?php include 'http://mysite.com/somepage.php'; ?> and i get this error: Warning: include(): php_network_getaddresses: getaddrinfo failed: Name or service not known in I even tried by including content from yahoo.com or facebook and didnt work either. However the includes will work if i use IPs instead of domains. Do i have a DNS problem or something? What can i do to fix it? Im on a Linux 2.6.32-431.11.2.el6.x86_64 on x86_64 CentOS Linux 6.5 I have this on my resolv.conf # Generated by NetworkManager # No nameservers found; try putting DNS servers into your # ifcfg files in /etc/sysconfig/network-scripts like so: # # DNS1=xxx.xxx.xxx.xxx # DNS2=xxx.xxx.xxx.xxx # DOMAIN=lab.foo.com bar.foo.com nameserver 8.8.8.8 nameserver 8.8.4.4 Thank you.

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• Providing access to a no-www website in an active directory environment

  - by oasisbob

  Our website is hosted externally, off our network. The canonical URL is a is intentionally lacking www, and will 301 redirect any requests containing www to the canonical URL. So far, so good. The problem is providing access to the website from within our LAN. In theory, the answer is simple: add a host record in DNS pointing foobarco.org to the external webhost. (eg foobarco.org -- 203.0.113.7) However, Our active directory domain is the same as our public website (foobarco.org), and AD appears to periodically auto-create host (A) records in the domain root corresponding to our domain controllers. This causes obvious problems: users on the LAN attempting to access the website resolve the domain controllers instead. As a stop-gap measure we're overriding DNS using the hosts file on clients, but this is a quick hack that doesn't scale well. The hosts-file hack hasn't broken anything obvious, so I doubt that this behavior is essential to AD operations, but I haven't found a way to disable it. Is it possible to override this behavior?

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• BIND9 Forwarding by view

  - by Triztian

  Hi I think this is a simple issue, I'd like to forward only to certain IPs in the LAN network, for example I have 2 acl lists: acl "office1" { 192.168.1.15; // With internet access }; acl "production" { 192.168.1.101; // No internet access }; I know that there probably should be more efficient ways to restrict internet access, but at the moment this is what I'd like to try.Here's what I've tried in named.conf.local // Inlcude my acl definitions include "/etc/bind/acls.conf"; view "no-internet" { match-clients { production; }; include "/etc/bind/named.conf.default-zones"; zone "localdomain.com" { type master; file "/etc/bind/db.localdomain.com"; }; zone "1.168.192.in-addr.arpa" { type master; file "/etc/bind/db.192.168.1"; }; } view "internet" { match-clients { office1; }; include "/etc/bind/named.conf.default-zones"; forwarders { 201.56.59.14; // Made Up 201.56.59.15; // Made Up }; zone "localdomain.com" { type master; file "/etc/bind/db.localdomain.com"; }; zone "1.168.192.in-addr.arpa" { type master; file "/etc/bind/db.192.168.1"; }; }; As you can see I want a localdomain.com defined for every computer in my network and forward internet access to the computers in the office but not to the ones on the production floor. I've modified my conf file, however the IP in the "no-internet" acl is able to resolve the domains, even though I've rebooted the computer, flushed the DNS using ipconfig /flushdns and set my DNS Server as the only one, why is this still happening? Thanks in advance.

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• Which DNS settings are used when setting up server

  - by Saif Bechan

  I have a server and want to run my own name server service. Now I have set it up already and it works not, but I do not know where the exact settings are stored. On my server I use Plesk. When I edit DNS settings there I think it is stored in named.conf. Named is installed on the server, and BIND. Now I also have a panel from my registrar. This is separate from my server. Both places I can add the normal MX,A,CNAME, etc records. Now where is the best way to place this settings. Currently I have the same records on both places, on the server and at the registrar panel. I am correct to just add all the records at the registrar panel, and remove everything from within PLESK, and just don't run DNS on my server, because it is already done in the registrar panel. Or should I add the records in both places.

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