> Is anyone interested in developing some kind of standard handling for
> such situations (i.e. periodic change of location, link status, etc.)

I use an idea I got from David Carrel on my notebook.  Of course in
true sjg fasion I couldn't leave it simple :-)

/etc/neton "net"

configures ep0 according to some variables in the script, and then
runs /etc/net-"net".d/S* followed by /etc/net.d/S*

Similarly /etc/netoff runs /etc/net.d/K* before deleting default
routes and disabling ep0.

This allows a bunch of things that are unique to each "net" to be
turned on/off.

For example switching to

/etc/aliases-$net
/etc/printcap-$net
/etc/resolv-$net

and re-starting sendmail.

Worked fine until the notebook died :-)