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Running win 2003 server on two subnets - intermittent outages

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  • Running win 2003 server on two subnets - intermittent outages

    Hi there,

    Just wondering if anyone could help me with a problem we are
    experiencing. We have a windows server running with two NICs on two seperate subnets going out on two different VLANs. Both NICs have different gateways for each subnet.



    The firewall cannot route between the two firewalls and we are working to try and get the routing sorted.


    I have a subnet on each NIC and intermittently we are having outages on each subnet. I have a continuos ping running against each subnet and there seems to be brief 5-10second outages on alternate ranges.



    There doesnt seem to be any pattern between the issues.

    We have websites running on each of the subnets and obviously the sites go down when there is an issue.


    We have IP addresses from each subnet on seperate servers running only in one subnet and these run fine with no problems.



    Anyone any ideas?

  • #2
    Re: Running win 2003 server on two subnets - intermittent outages

    The problem is very likely the 2 default gateways, Win 2K3 really doesn't like having multiple default gateways.

    More info at technet.
    BSc, MCSA: Server 2008, MCSE, MCSA: Messaging, MCTS
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    • #3
      Re: Running win 2003 server on two subnets - intermittent outages

      And most devices don't like multiple gateways.
      Use static routes instead when needed and use only one default gateway.
      Marcel
      Technical Consultant
      Netherlands
      http://www.phetios.com
      http://blog.nessus.nl

      MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
      "No matter how secure, there is always the human factor."

      "Enjoy life today, tomorrow may never come."
      "If you're going through hell, keep going. ~Winston Churchill"

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