[Smaug] Ubuntu/Debian networking setup on laptop

[Peter Belew]

I have my laptop (with Ubuntu installed) set up so it works ok
wireless and wired (ra0 and eth0 interfaces respectively), but
have to manually change /etc/network/interfaces when moving
from using at home to using at school or at a friend's place.

At home I use fixed addresses, and have a WEP key for
the wireless. I have an internal DNS server on my LAN for
LAN addresses.

Elsewhere I access unencoded access points wireless, and
an Ethernet port with DHCP.

I'd like to be able to set up this on /etc/network/interfaces to
make it easy to select what I want manually, without entering
all the parameters manually. Ubuntu has a GUI tool for
configuring - 'network-admin' but I'm not sure if that can be
set up to allow menu selection of the choices I want.

I do have the 'resolvconf' package installed, which should
help with changing /etc/resolv.conf appropriately when changing
primary interfaces.

Does anyone have experience with this?

 - Peter