Rarely issue with NetBios

Discussion in 'Windows Networking' started by ABC, Nov 12, 2009.

  1. ABC

    ABC Guest

    I have a problem and I need help with this issue. The situation is described
    as following:
    I have 2 sites, “Site A†and “Site Bâ€. The computers in “Site A†cannot
    access to the most shared resources of computers in “Site Bâ€. However from
    the computers in “Site B†can access to their shared resources between them
    as well as to the computers in “Site Aâ€
    The computers in “Site A†can do ping and get remote access by terminal
    server to the computers in “Site B†and vice versa. However from “Site A†it
    cannot access to the shared resources of the most of computers in “Site Bâ€
    and for other computers in “Site B†it can be access it.
    The client computers are managed by active directory domain; I have 2 Domain
    Controllers under Windows Server 2008 in "Site A" and 1 Domain Controller in
    "Site B". The clients are Windows XP and it has enable File and Printer
    Sharing. The PDC is in "Site A".
    ABC, Nov 12, 2009
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  2. Hello ABC,

    If you use multiple subnets you have to install WINS to use NetBIOS resolving.
    If DNS is configured correct you should be able to access any share via \\server\share.
    Meinolf Weber [MVP-DS], Nov 12, 2009
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  3. ABC

    ABC Guest

    Hi Meinolf,

    Thanks for your answer, but my DNS resolution is working fine, because i'm
    getting the correct ip address from a nslookup query, and i'm sniffing 2
    connections with wireshark to 2 diferents computers in "Site B" and the
    destination ip address are correct, but with one computer the connection was
    sucessfully and with the another computer was falied and with this computer
    i've nerver recived a response except for an ICMP echo REPLY in response to
    an ICMP echo REQUEST that was sending in the falied trying connection to the
    shared resource.
    ABC, Nov 12, 2009
  4. Hello ABC,

    As said before if you need NetBios name resolution, use WINS.
    Meinolf Weber [MVP-DS], Nov 12, 2009
  5. I agree with Meinolf. You need WINS in a multi-subnetted environment.


    This posting is provided "AS-IS" with no warranties or guarantees and
    confers no rights.

    Please reply back to the newsgroup or forum for collaboration benefit among
    responding engineers, and to help others benefit from your resolution.

    Ace Fekay, MCT, MCITP EA, MCTS Windows 2008 & Exchange 2007, MCSE & MCSA
    2003/2000, MCSA Messaging 2003
    Microsoft Certified Trainer

    For urgent issues, please contact Microsoft PSS directly. Please check
    http://support.microsoft.com for regional support phone numbers.
    Ace Fekay [MCT], Nov 12, 2009
  6. ABC

    ABC Guest

    Thanks, for your answers. I've been trying to find the cause of this problem,
    and i got it, although it is somewhat embarrassing to say, but it only was
    that some computers in "Site B" had configured the Windows Firewall to block
    connections from public networks.

    That was the reason why computers in "Site B" could access to their shared
    resources between them and computers from "Site A" coudnt connect to the
    shared resources in "Site B".

    But, it's something that's still no clear to me.¿Why do you say to me that i
    should use a WINS server to resolve names in a multi subnet enviroment
    instead of a DNS server??.Both do the same work and I don't see why do you
    prefer WINS instead of DNS. For even, DNS has many advantages over WINS.
    ABC, Nov 17, 2009
  7. Hello ABC,

    As you mentioned the use of NetBIOS we recommended the use of WINS. Normally
    DNS is enough for pure AD environment. But some services, also applications
    still rely on Netbios/WINS so if you have more then one subnet WINS is really
    helpful as addition.
    Meinolf Weber [MVP-DS], Nov 17, 2009

  8. As Meinolf said, some apps still require NetBIOS and not DirectSMB, whcih is
    what non-NetBIOS uses with AD, resolution. One huge example is Exchange.

    Exchange Server 2003 and Exchange 2000 Server require NetBIOS name
    ....Explains the different scenarios where Exchange Server 2003 and Exchange
    2000 Server still require NetBIOS name resolution for full functionality.

    Otherwise, for the most part you can get away from WINS in your scenario,
    where AD support computername resolution through DNS and single name
    connectivity using DirectSMB (port 445). Matter of fact,with AD, it will try
    DirectSMB first, then NetBIOS (139).

    Ace Fekay [MCT], Nov 17, 2009
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