SLES 11 SP4

Currently only have 1 NIC defined to my server and doing a route command shows that Default Gateway is associated with eth0. I configured 2 additional NICs with IPs in the same subnet as eth0, though when doing this the Default Gateway became associated with eth2. Is there a way like editing routes in /etc/sysconfig/network to indicatre eth0 is to be used for the Default Gateway?

All IPs use the same Gateway as they are in the same subnet and I do need traffic in and out for the IP on eth0 to use eth0 and the same for the other interfaces eth1 and eth2. Will this require "Split Access" setup with routing table and rules?

Thanks,
Duane