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Windows 7 unable to access the DFS having Multiple IPs

    Question

  • Windows 7 users are unable to access the DFS shares sometimes, however they are able to access the same with IP.

    I have almost 400 users with Windows XP and Windows 7 in two different sites. Initially we were on windows 2003 domain when the DFS configured but we have migrated on Windows 2008 Domain and now we are in the transition phase of windows 7.

    Windows XP users never complaint the issue.

    I am accessing the DFS share with my domain name

    \\domainname.com (Unfortunately the Public and local domain name is same)

    Multiple DNS entries for domainname.com according the subnets and sites, as the old entries of old IP scheme is also exist.

    When i tried to nslookup domainname.com it shows like following

    Addresses:  172.16.10.101, 172.16.10.41, 172.16.10.65, 172.16.10.201
              198.10.10.41, 198.10.10.24, 172.18.10.104, 10.1.10.30, 172.17.1.11
              172.18.10.0, 198.10.10.0, 172.18.10.201, 172.18.10.101, 198.10.10.1

    On windows 7 when I ping the domainname.com it ping the IP of 198.10.10.1 however the IP of windows 7 is belonging to the different subnet and has 172.16.2.1 configured.

    Sometime it pings 198.10.10.1 and sometime it pings 172.18.2.1. 

    After ipconfig/flushdns it pick different IP but not the required one.

    After restarting the problem machine it works fine for sometime. 

    Kindly advise how can I trace and resolve the issue.

    Monday, November 19, 2012 7:44 PM

All replies

  • You need check your dns server.

    Your DNS probably has two "a" records associated with two different ips.

    Delete the "a" record with the wrong IP.

    Also make sure that Windows XP computers and Windows 7 are getting the correct DNS name assignment through DHCP. (run ipconfig /all and compare the DNS ip)

    Maybe your W7 is pointed to the external DNS server while the XP to internal.

    Monday, November 19, 2012 10:31 PM
  • Thanks for the response, 

    Both Windows XP and Windows 7 has same DNS server. 

    Let me further explain the scenario here

    Windows 7 has the IP 172.16.2.1

    Windows XP has the IP 172.16.3.1

    However the domain name shows the IP mention earlier

    Addresses:  

    172.16.10.101, 172.16.10.41, 172.16.10.65, 172.16.10.201
    198.10.10.41, 198.10.10.24, 172.18.10.104, 10.1.10.30, 172.17.1.11
    172.18.10.0, 198.10.10.0, 172.18.10.201, 172.18.10.101, 198.10.10.1

    Domainname.com has multiple IP as we have different DC's in our environment to provide authentication to users according to their subnet. 

    Windows XP always access the IP of same subnet like 172.16.10.101, 172.16.10.41, 172.16.10.65, 172.16.10.201 but on windows 7 it mostly access the IP which are not from the same subnet, while i tried to ping the domainname.com from windows 7, it sometime tries to ping 198.10.10.1 sometimes it tries to ping 10.1.10.30 and some times 172.18.10.104

    DNS server has the Round Robin enabled, but as per my understanding the system should pick the IPs from same subnet instead to access the IPs which or on different network.


    Tuesday, November 20, 2012 2:47 PM