Using RHEL with Multiple ISPs

[ken]

Does anyone have any real-work configuration experience using RHEL as a 
firewall and/or router with multiple providers?  I don't need device failover, 
but just a way to NAT and route traffic from 192.168.0.0/255.255.255.128 
through ISP#1 on eth0.15 and fraffic from 192.168.0.128/255.255.255.128 though 
ISP#2 on eth0.16.  I'd VERY much like to use RedHat's networking scripts, as 
I'm using vlans on top of bonded ethernet devices.

Thanks!
Ken