Multiple gateways

I'm using RHEL3.0AS and have to active network devices, eth1 and eth3.
I've got GATEWAY devices defined in both ifcfg-eth1 and ifcfg-eth3
instead if /etc/sysconfig-network. The problem is that when the
interfaces are up, only one default gateway is defined. I need both
gateways active so that if one interface goes down, all other traffic
have a second default gateway to travel down.

Destination Gateway Genmask Flags MSS Window irtt Iface
10.1.1.0 0.0.0.0 255.255.255.240 U 40 0 0 eth1
10.1.2.224 0.0.0.0 255.255.255.224 U 40 0 0 eth3
127.0.0.0 0.0.0.0 255.0.0.0 U 40 0 0 lo
0.0.0.0 10.1.1.4 0.0.0.0 UG 40 0 0 eth1
0.0.0.0 10.1.2.4 0.0.0.0 UG 40 0 0 eth3

This was from a RH2.1 box I'm trying to duplicate onto RH3.0.

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