When you're on to go, you have to change you IP addresses to often. I forgot my DNS configuration... I want to use IP addresses from a DHCP server. Too much user time consumption when one must set up the proxy to connect to the internet...

CyE Network IP Profiler will be a great help when it come to adding several network profiles with your help. It lets you create profile for each NIC especially for Local Area Connection or Wireless Area Connection.