Topic: IP Alias

[Erga]

I installed 5.6U4 on a new server. I'd like to add some IPs for external network, so I need to use IP Alias for ethernet on external network. How do I set IP Alias on E-Smith 5.6U4? And how do I set routing table or port forwader? Because on RedHat distro I use SNAT on IPtables.
Thank You