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Dual NICs enabled, issues with Netbios

    Question

  • I have a Win 2003 Server R2 (that I did NOT config) that has BOTH GB NICs enabled as follows:
    C:\Documents and Settings\Administrator>ipconfig /all
    
    Windows IP Configuration
    
       Host Name . . . . . . . . . . . . : EMDS-SERVER
       Primary Dns Suffix  . . . . . . . : SBFC.local
       Node Type . . . . . . . . . . . . : Hybrid
       IP Routing Enabled. . . . . . . . : No
       WINS Proxy Enabled. . . . . . . . : No
       DNS Suffix Search List. . . . . . : SBFC.local
    
    Ethernet adapter Local Area Connection:
    
       Connection-specific DNS Suffix  . :
       Description . . . . . . . . . . . : Broadcom BCM5708C NetXtreme II GigE (NDIS VBD Client)
       Physical Address. . . . . . . . . : 00-19-B9-B4-5C-33
       DHCP Enabled. . . . . . . . . . . : No
       IP Address. . . . . . . . . . . . : 192.168.74.2
       Subnet Mask . . . . . . . . . . . : 255.255.255.0
       Default Gateway . . . . . . . . . : 192.168.74.1
       DNS Servers . . . . . . . . . . . : 192.168.74.2
                                           192.168.74.1
    
    Ethernet adapter Local Area Connection 2:
    
       Connection-specific DNS Suffix  . :
       Description . . . . . . . . . . . : Broadcom BCM5708C NetXtreme II GigE (NDIS VBD Client) #2
       Physical Address. . . . . . . . . : 00-19-B9-B4-5C-35
       DHCP Enabled. . . . . . . . . . . : No
       IP Address. . . . . . . . . . . . : 192.168.74.3
       Subnet Mask . . . . . . . . . . . : 255.255.255.0
       Default Gateway . . . . . . . . . : 192.168.74.1
       DNS Servers . . . . . . . . . . . : 192.168.74.2
                                           192.168.74.1
       NetBIOS over Tcpip. . . . . . . . : Disabled
    
    C:\Documents and Settings\Administrator>
    I have a problem where the Netbios browser is flakey - I need to know i fthis config is just plain horrible (which I suspect) and that I need to DISABLE one of the 2 NICs, if so, I have a suspicion that it will be difficult to do so, as the wizards do all sort of things in the background...

    Bottom line is this:
    The MAIN IP is 192.168.74.2
    SECONDARY is 192.168.74.3 

    MAIN Has DHCP enabled, as does SECONDARY, WINS shows in the admin snap-in as only on SECONDARY, BUT, if I set the WINS Server parameter as 33.3, then I get (in a packet capture) ICMP Destination (Port) Unreachable errors.

    Is there a really good detailed best practice doc for this scenario ?
    OR, if not, as I suspect, then is the a way to move this DUAL NIC'd server back to a single NIC config that is straight forward ?
    I need to have a step by step recommendation preferably, because I don't want to damage the overall integrity of the server by screwing up the networking configs.

    Any help HIGHLY appreciated.
    Don
    Saturday, July 11, 2009 12:04 PM

Answers

  • Hello,

    you should NEVER multihome a Domain controller, so remove asap the previous admins configuration and use either a teaming software, if possible with your hardware, to have redundancy or load balancing with 2 NIC's or disable one of the NICs.
    Best regards Meinolf Weber Disclaimer: This posting is provided "AS IS" with no warranties, and confers no rights.
    Sunday, July 12, 2009 10:44 AM
  • hi there,

    please find the supported KB article which specifies not to use multihomed DC

    http://support.microsoft.com/kb/272294


    sainath !analyze
    Sunday, July 12, 2009 5:35 PM
    Moderator
  • I have came across this issue a couple of times, using packet capture software you could verify this also.
    Sometimes the WINS requests go out 1 NIC, and come back on another NIC, thich causes the packets to be dropped.
    Also, you should never have 2 default gateways defined on seperate interfaces which is most probably why you are receiving this issue.

    Disable the defautl gateway on the NIC which you don't want to use WINS and then test, although as has been said, using dual NICs is not good practive at all when it comes to DC's.

    Terry http://www.sucked-in.com
    • Proposed as answer by Tabmow Tuesday, July 14, 2009 10:47 PM
    • Marked as answer by Tim QuanModerator Thursday, July 16, 2009 1:53 AM
    Monday, July 13, 2009 1:20 AM

All replies

  • Hello,

           Please refer the following link http://support.microsoft.com/kb/185786

    http://technet.microsoft.com/en-us/library/cc958937.aspx
    http://technetfaqs.wordpress.com
    Saturday, July 11, 2009 2:08 PM
  •   I have always steered clear of multihoming any machine which is a DNS server or a possible master browser. There are too many little things which can go wrong. Personally I would either disable one NIC or team them and make the necessary changes to the DNS settings.

      I am surprised that you are seeing any Netbios problems though. Netbios over TCP/IP is disabled on the second NIC. WINS shouldn't see it at all.

       I didn't follow the bit about wizards. Are you running SBS server? 
    Bill
    Sunday, July 12, 2009 1:39 AM
  • Hello,

    you should NEVER multihome a Domain controller, so remove asap the previous admins configuration and use either a teaming software, if possible with your hardware, to have redundancy or load balancing with 2 NIC's or disable one of the NICs.
    Best regards Meinolf Weber Disclaimer: This posting is provided "AS IS" with no warranties, and confers no rights.
    Sunday, July 12, 2009 10:44 AM
  • hi there,

    please find the supported KB article which specifies not to use multihomed DC

    http://support.microsoft.com/kb/272294


    sainath !analyze
    Sunday, July 12, 2009 5:35 PM
    Moderator
  • I have came across this issue a couple of times, using packet capture software you could verify this also.
    Sometimes the WINS requests go out 1 NIC, and come back on another NIC, thich causes the packets to be dropped.
    Also, you should never have 2 default gateways defined on seperate interfaces which is most probably why you are receiving this issue.

    Disable the defautl gateway on the NIC which you don't want to use WINS and then test, although as has been said, using dual NICs is not good practive at all when it comes to DC's.

    Terry http://www.sucked-in.com
    • Proposed as answer by Tabmow Tuesday, July 14, 2009 10:47 PM
    • Marked as answer by Tim QuanModerator Thursday, July 16, 2009 1:53 AM
    Monday, July 13, 2009 1:20 AM