Accessing a single repository with different addresses?

["Paul Holbrook" <paul.holbrook@gmail.com>]

I have two machines at home that I've been using to play with git: a
desktop box and a laptop.  I set up a repository on the desktop, and
cloned it to the laptop via ssh, but using just a local 192.168.x.x
address.  However, when I leave the house, I'd still like to be able
to talk to the desktop repository, which I can still do via ssh back
to the house - but now the address for that very same repository is
not a 192 address, but a DNS name.   What's the best way to handle
this?

I'm aware that with git I don't need to have the all-the-time
connectivity to make it work - but when I leave the house,  there may
be changes on the desktop repository that I haven't yet pulled to the
laptop.  I still want to be able to get at those when I'm away from
home.

-- Paul