long(ish) story ... suffice to say I need to make some connections to (& through) my home DSL router whilst abroad.

Right now the router has some f/w rules that I've set to allow inbound traffic - to do "Wake on LAN" to local PC's on my home network and/or to use the SSH server on the router (custom firmware) to proxy traffic through my DSL to a 3rd party who expects to see my static IP).

Some of those rules I've set to limit connections to Voda IP range only (in addition to all the other stuff like non-standard ports, public/private rsa keys etc.). In an ideal world I'd like to keep some of those f/w rules in place while abroad (though no great issue if I have to open it up to any old IP, it's just that I'm a cautious old fellow).

I agree with your guess, but I'd like it backed up by some practical evidence :-)