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  • Forwarders do not appear to be working.

    I have setup a Windows 2008 R2 Server to act as a our new domain server. It's to be the only domain cotroller on the network as we are only one site with 8 users.

    I have setup the DNS with default settings and the only thing I have changed is to add two forwarders that point to out IP address DNS servers.

    We already use these DNS Servers with our exisitng DNS in our old domain (Using BIND for DNS) and everythig works fine.

    On the new server, pointing to itself for DNS and logged in as administration I can resolve some website and not others.

    If I use nslookup it sometimes resolves the name and sometimes not. Sometimes after nslookup has resolved an address I can resolve it by pinging or web browsing.

    One site I am having issues with at the moment is www.firefox.com. If I run
    nslookup www.firefox.com
    I get the following

    C:\Users\Administrator>nslookup www.firefox.com
    1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0. 0.0.0.0.0.0.0.ip6.arpa
    primary name server = 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.
    0.0.0.0.0.0.0.ip6.arpa
    responsible mail addr = (root)
    serial = 0
    refresh = 28800 (8 hours)
    retry = 7200 (2 hours)
    expire = 604800 (7 days)
    default TTL = 86400 (1 day)
    Server: UnKnown
    Address: ::1

    DNS request timed out.
    timeout was 2 seconds.
    *** Request to UnKnown timed-out

    If I run nslookup against my ISP's DNS it resolves.


    C:\Users\Administrator>nslookup www.firefox.com 212.23.3.100
    Server: dns.lb.mbr-roch.zen.net.uk
    Address: 212.23.3.100

    Non-authoritative answer:
    Name: firefox.com
    Address: 63.245.209.50
    Aliases: www.firefox.com


    Can anyone help, I just can't see why it sometimes forwards the DNS requests to my ISP and sometimes not.

  • #2
    Re: Forwarders do not appear to be working.

    I thought I'd got this working. I noticed that on the domain controller with DNS installed the dns entry in the IP configuration was pointing to it's own IP address.

    I decided to change this to 127.0.0.1 and a couple of minutes later everything was resolving OK. I test www.firefox.com and it was OK and then went on to test around 40 other websites. Again all OK.

    Then all of a sudden www.firefox.com fails again. Other websites still work though. I have also found www.aol.com doesn't work. But again if I nslookup www.aol.com 212.23.3.100, it resolves the name correctly.

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    • #3
      Re: Forwarders do not appear to be working.

      Hi,

      if you are not using IPv6 then I would suggest you to disable it and then check

      Also you may like to check these KBs as well

      Windows 2008 DNS Server May Fail to Resolve Top-Level Domain Queries
      http://www.anitkb.com/2010/05/window...y-fail-to.html

      Windows Server 2008 R2 DNS Issues (EDNS0)
      http://www.anitkb.com/2010/03/window...ues-edns0.html
      Last edited by v-2nas; 14th January 2011, 17:49.
      Thanks & Regards
      v-2nas

      MCTS 2008, MCTIP, MCSE 2003, MCSA+Messaging E2K3, MCP, E2K7
      Sr. Wintel Eng. (Investment Bank)
      Independent IT Consultant and Architect
      Blog: http://www.exchadtech.blogspot.com

      Show your appreciation for my help by giving reputation points

      Comment


      • #4
        Re: Forwarders do not appear to be working.

        Originally posted by v-2nas View Post
        Hi,

        if you are not using IPv6 then I would suggest you to disable it and then check

        Also you may like to check these KBs as well

        Windows 2008 DNS Server May Fail to Resolve Top-Level Domain Queries
        http://www.anitkb.com/2010/05/window...y-fail-to.html

        Windows Server 2008 R2 DNS Issues (EDNS0)
        http://www.anitkb.com/2010/03/window...ues-edns0.html
        Hi I'll have a look through those KB's. I forgot to mention I have already disabled IPv6 (when i say disabled I mean unticked the tick box in the network properties)

        Comment


        • #5
          Re: Forwarders do not appear to be working.

          I'm still having issues with this. Most names resolve successfully but the odd one doesn't. The two pages that were linked by v2-nas seem to be about adding forwarders rather than using root hints which is what I already have set up.


          One other thing to note is that on some occasions I can't resolve a name using nslookup, so I use nslookup against my ISPs DNS and it resolves. A couple of minutes later using nslookup against my DNS server begins to work.

          This is a new domain that we are migrating to. It should have gone live last Friday but I don't want to go over to the new domain and keep coming across resolution issues. Especially from people trying to send emails.

          Comment


          • #6
            Re: Forwarders do not appear to be working.

            I had some issues after migration to 2008 R2 that were similar. In my case the article v-2nas linked to here was the issue.

            Next time it happens try clearing the DNS cache on the server. If that fixes it then it's likely the TTL issue. It was a bit sporadic with me as well though. I don't use forwarders though, root hints only.
            BSc, MCSA: Server 2008, MCSE, MCSA: Messaging, MCTS
            sigpic
            Cruachan's Blog

            Comment


            • #7
              Re: Forwarders do not appear to be working.

              Hi,

              can you take a network trace using netmon. take two traces one with your dns when issue is happening and one with your isp dns when no issue happen. Upload it along with dcdiag and netdiag reports.
              Thanks & Regards
              v-2nas

              MCTS 2008, MCTIP, MCSE 2003, MCSA+Messaging E2K3, MCP, E2K7
              Sr. Wintel Eng. (Investment Bank)
              Independent IT Consultant and Architect
              Blog: http://www.exchadtech.blogspot.com

              Show your appreciation for my help by giving reputation points

              Comment

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