Debian: standard outgoing IP / route

debiandebian-squeezelinux-networkingnetworking

On a debian squeeze server I got 2 IPs on eth0 (eth0 and eth0:1). When opening TCP connections the server uses the eth0:1 IP by default.
However I want it to use the primary (eth0) IP because I want the other to be used for (listening) daemons only.

#/etc/network/interfaces
    auto eth0
    iface eth0 inet static
            address 92.xxx.xxx.92
            netmask 255.255.255.192
            network 92.xxx.xxx.64
            broadcast 93.xxx.xxx.127
            gateway 92.xxx.xxx.65

    auto eth0:1
    iface eth0:1 inet static
            address 108.xxx.xxx.146
            netmask 255.255.255.192
            gateway 108.xxx.xxx.129

#ip route show
    108.xxx.xxx.128/26 dev eth0  proto kernel  scope link  src 108.xxx.xxx.146
    92.xxx.xxx.64/26 dev eth0  proto kernel  scope link  src 92.xxx.xxx.92
    default via 108.xxx.xxx.129 dev eth0  src 108.xxx.xxx.146
    default via 92.xxx.xxx.65 dev eth0

What can I do to make debian use the 92. IP for outgoing connections? The other one should still work of course.

Best Answer

You should almost certainly only have one gateway parameter in your networking config (basically, if you don't know why you need two, you don't). The gateway parameter specifies the default gateway for your machine -- the router that traffic which doesn't have a more-specific route should be sent. On most networks, there's only one router that fits that criteria, even though you may have several other (more specific) routes for other networks.

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