Multiple NICs + GW's

From: Michael Bellears (MBellears_at_staff.datafx.com.au)
Date: 11/30/04

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    Date: Tue, 30 Nov 2004 15:14:18 +1000
To: <debian-user@lists.debian.org>

    I have a test webserver with two NICs:

    Eth0: xxx.xxx.ba.3/24
    Eth1: xxx.xxx.bb.115/28

    Route Table:
    Destination Gateway Genmask Flags Metric Ref Use
    Iface
    xxx.xxx.bb.112 xxx.xxx.bb.113 255.255.255.240 UG 0 0 0
    eth1
    xxx.xxx.bb.112 0.0.0.0 255.255.255.240 U 0 0 0
    eth1
    xxx.xxx.ba.0 0.0.0.0 255.255.255.0 U 0 0 0
    eth0
    0.0.0.0 xxx.xxx.ba.254 0.0.0.0 UG 0 0 0
    eth0

    Eth0 is directly connected to core router, which has an IP of
    xxx.xxx.ba.254
    Eth1 is connected to a Loadbalancer, which has an IP of xxx.xxx.bb.113
    (Which is connected to core Router)

    Core Router has route for xxx.xxx.bb.112/28 -> xxx.xxx.bb.113

    Traffic from external:
    Connections to xxx.xxx.ba.3 are all successful.
    Connections to xxx.xxx.bb.115 all fail.

    Connections to xxx.xxx.bb.113(Loadbalancer) are all successful.

    If I run tcpdump on eth1, I can see the traffic hitting the webserver,
    but it never returns - It appears to throw it back out via the
    webservers default gw (xxx.xxx.ba.254).

    FYI: I have another test webserver (Single NIC), sitting behind
    loadbalancer, with IP of xxx.xxx.bb.114/28 (Def. GW xxx.xxx.bb.113)
    which can successfully be contacted from external.

    Is there anyway I can force traffic to go back out via the NIC it came
    in on?

    Regards,
    MB

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