[NTLUG:Discuss] Routing question

[Bug Hunter]

  I need help from a real routing expert.

  We have two networks on the same wire.  One is being used as a backup
network, with the secondary domain name server living on the backup
network.  All machines have dual ip addresses on one nic card, and are
running RedHat 6.1 or better.  The default gateway points to the primary
network gateway.

  We had a primary network failure, and we were unable to contact the
servers using the secondary ip address set.  It appears they wanted to
send the answers out the primary gateway, even though the secondary
gateway provided the request.

  Can someone help me make this work?

thanks,
bug