Vigor 120 (ethernet modem) PPPoE passthrough
2600 Old school
2820 New firmware (use with the ethernet passthrough or 3g wireless.)
the 2600 and the 2820 use a feature called teleworkier. This essentialy creates a link to the locl network from the outside. You can you then use 2 seperate local IP subnets and VPN to the one you want as a teleworker.