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Windows XP Clients not using secondary DNS server

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  • Windows XP Clients not using secondary DNS server

    I have a windows 2003 domain with 2 DC's both running DNS. Both servers use themselves as the only DNS server, and both servers use my ISP's DNS servers as forwarders. All clients are windows xp, and use DHCP. When the primary dns server goes down for maintenance or unexpectedly, client are no longer able to resolve external names. I am able to resolve internal names, but i think that is using WINS. Why is it that the clients do not use the secondary dns server? I have seen something posted about a time limit before the clients will switch, is this correct? Is there a way to modify the time limit?

    Thanks,
    Jason

  • #2
    Re: Windows XP Clients not using secondary DNS server

    do you have DHCP configured to give out both DNS servers?
    "...if I turn out to be particularly clear, you've probably misunderstood what I've said” - Alan Greenspan

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    • #3
      Re: Windows XP Clients not using secondary DNS server

      Yes i do, here is a sample of ipconfig /all



      Windows IP Configuration

      Host Name . . . . . . . . . . . . : machine
      Primary Dns Suffix . . . . . . . : domain.local
      Node Type . . . . . . . . . . . . : Hybrid
      IP Routing Enabled. . . . . . . . : No
      WINS Proxy Enabled. . . . . . . . : No
      DNS Suffix Search List. . . . . . : domain.loacal

      Ethernet adapter Local Area Connection:

      Connection-specific DNS Suffix . : domain.loacal
      Description . . . . . . . . . . . : Broadcom 570x Gigabit Integrated Controller
      Physical Address. . . . . . . . . : 00-0F-1F-1E-AC-54
      Dhcp Enabled. . . . . . . . . . . : Yes
      Autoconfiguration Enabled . . . . : Yes
      IP Address. . . . . . . . . . . . : 10.29.42.38
      Subnet Mask . . . . . . . . . . . : 255.255.0.0
      Default Gateway . . . . . . . . . : 10.29.41.254
      DHCP Server . . . . . . . . . . . : 10.29.41.60
      DNS Servers . . . . . . . . . . . : 10.29.41.51
      10.29.41.52
      Primary WINS Server . . . . . . . : 10.29.41.52
      Secondary WINS Server . . . . . . : 10.29.41.60
      Lease Obtained. . . . . . . . . . : Thursday, September 07, 2006 3:34:59 PM
      Lease Expires . . . . . . . . . . : Thursday, September 07, 2006 11:34:59 PM

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      • #4
        Re: Windows XP Clients not using secondary DNS server

        Check DNS2 and make sure recursion isn't disabled. If it is the DNS won't resolve anything outside your network.

        **edit - added screenshot**


        If recursion isn't disabled make sure you're using the same forwarders. If you are, test a DNS query from DNS2 using nslookup for an external address. Let us know the result. As always make sure you're traffic isn't being blocked by a firewall or router.

        Good luck.
        Last edited by ahinson; 8th September 2006, 05:37.
        Andrew

        ** Remember to give credit where credit is due and leave reputation points sigpic where appropriate **

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        • #5
          Re: Windows XP Clients not using secondary DNS server

          I double checked and recursion is not disabled, and we are using the same forwarders. Everything is working correctly with DNS2. I can change to that server using nslookup and query any type of record and get a correct response. It just seems that the clients don't change over to using the secondary DNS server.

          Thanks.

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