LinuxQuestions.org - Multiple IP addresses + Routing?

I have several static IP addresses, and would like to set up a linux box to act as a router.

If I have 3 static IP addresses, and 4 NICs in the machine (3 outgoing, 1 incoming) can I do the following?

* Assign 3 IP addresses on one (physical) interface
* Have the other three interfaces forward traffic, each depending on one of the three static IPs?

I would assume it looks something like what I put below, but I'd love it if someone could point me in the right direction. If there is a distro similar to smoothwall, only able to do this, that would be nifty as well. ;)

Code:

#Not very familar with iptables, sorry

iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT 

iptables -A INPUT -i lo -j ACCEPT 

iptables -A INPUT -i eth0 -p ICMP -j DROP

iptables -A INPUT -i eth1 -j ACCEPT 

iptables -A INPUT -i eth2 -j ACCEPT 

iptables -A INPUT -i eth3 -j ACCEPT 

iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT

iptables -A FORWARD -i eth2 -o eth0 -j ACCEPT

iptables -A FORWARD -i eth3 -o eth0 -j ACCEPT

iptables -A FORWARD -i eth0 -o eth1 -m state --state ESTABLISHED,RELATED -j ACCEPT

iptables -A FORWARD -i eth0 -o eth2 -m state --state ESTABLISHED,RELATED -j ACCEPT

iptables -A FORWARD -i eth0 -o eth3 -m state --state ESTABLISHED,RELATED -j ACCEPT

#example IPs below

iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source 216.170.248.162

iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source 216.170.248.163

iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source 216.170.248.164