We can use a Linux box as a advanced routing device by using iproute2 features. We have used a gateway server cater 3 ISP Internet connections. It supports policy based routing, load balancing etc.
Good reference
http://www.linux-tutorial.info/modules.php?name=Howto&pagename=Adv-Routing-HOWTO/index.html
http://www.policyrouting.org/iproute2.doc.html
Useful commands
Create a table
/sbin/ip rule add from a.b.c.d/n table 200
Add routes
/sbin/ip route add x.x.x.x/n2 via gateway_of_eth0 dev eth0 table table_number
E.g.
/sbin/ip route add 10.168.0.0/24 via 192.168.8.30 dev eth2 table 200
Adding a default rule
/sbin/ip route add default via gateway_of_eth2 dev eth2 table 200
Display routing table
ip route show table table_name
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