Two NICS on same network and NIC selection for traffic

Discussion in 'Server Networking' started by Alistair Keay, Jan 12, 2008.

  1. If I have two NICS on the same network how can I set all traffic for one
    destination IP on the same network to go out of one NIC rather then another.

    For example
    NIC 1. IP DGW
    NIC 2. IP

    Target IP

    How can I force all traffic for to go out over NIC2.
    All other traffic should go out over NIC1.

    Sorry if this is really obvious but I can't think how to do it.
    Alistair Keay, Jan 12, 2008
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  2. Alistair Keay

    Bill Grant Guest

    If you want to use two NICs in the same subnet to improve throughput,
    use NIC teaming. Without NIC teaming, two NICs in the same subnet will give
    you grief.
    Bill Grant, Jan 12, 2008
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  3. Thanks for the quick response.
    Actually I am not running ISA on the server.
    What I do have is OCS Mediation services on the server.

    I set it up with the idea of one NIC talking to the OCS consolidated
    servers\clients and the other to a Dialogic "Voice" Gateway.
    I setup with two NICs but didn't really think about the impact of the
    network I put the NICs on would have. To cut a long story short voice traffic
    is being sent from the wrong NIC to the Dialogic box which responds to the
    same NIC. The Meidation service however rejects the traffic as it is only
    listening to traffic from the Gateway on the other NIC.

    There are a few ways I can sort this out but it would be easiest if I can
    achieve the original requirement just by "tweaking" something in the OS.
    Thanks for any help,

    Alistair Keay, Jan 12, 2008
  4. Alistair Keay

    Adamu Garba Guest

    Hi Keay,

    I guess u need to setup ISA Server infrastructure on your network. You can
    have your requirement in simplified format using ISA server MMC console.
    You can redirect all outbound and inbound traffic coming from to
    NIC2 and all other traffic to NIC1.

    I hope this will help.

    Adamu Garba
    MCSE Security, MCTS, upgrade MCSE 2008.
    Adamu Garba, Jan 13, 2008
  5. Alistair Keay

    just Guest

    just, Jan 13, 2008
  6. Alistair Keay

    Bill Grant Guest

    Have you tried your luck in the OCS setup forum?

    Bill Grant, Jan 13, 2008
  7. Thanks all for the input.

    Due to limitations on what I can change I have done the following which has
    solved my problem for now.

    I have teamed the NICS to give me resilience and better throughput.
    In the OCS Mediation server I have configured both edges on a single adapter
    card\IP Address.

    Thanks for any help,

    Alistair Keay, Jan 14, 2008
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