I have two internet connections, one with cable, one with DSL. The cable is intended for data, and the DSL (which has lower throughput, but also much lower jitter), for VOIP desktop phones. I want to keep them both on the same LAN, so I can set the DSL up as a failover internet connection. Right now, however, I just want to have all of my VOIP phones use the DSL connection as their gateway. So I need to set up DHCP so that for a subset of MAC addresses, it specifies a different gateway. Can anyone suggest some search terms, or point me in the direction of some appropriate documentation?