I want to use multiple external interfaces on my ISA Server. How do I do this?
You can't. ISA Server will use a single external interface. However, you can use multiple external interfaces on an ISA Server when RainConnect for ISA Server becomes available (www.rainfinity.com). You might also want to check into a very reasonably priced hardware load balancer over at http://www.nexland.com/products/index.cfm?p=2 The ProTurbo line will allow you to connect mulitple modems. (This FAQ contributed by Tom Shinder)