VPN - Can see server from home, but cannot see home from server

I have a server running Windows Server 2003 and a laptop running
Windows XP.
When the the laptop is in the office and connects wirelessly to the
server, everything works fine between the laptop and the server in
both directions.
When I take my laptop home and connect to the server via VPN however,
I can see the server and use all of its resources without any problem,
but the server cannot see my laptop.

For example, when I'm connected via VPN to the server from home and
type \\servername\sharename from my laptop, I can see everything I
should be seeing and am able to add and edit files on the server. But
when, using that same connection, I go to the server at the office and
type \\laptopname\sharename, I get an error message saying it cannot
find the laptop.

I have a DLink modem at home and I connect wirelessly to it. I have
another laptop running Windows Vista, and when I have that laptop here
at home connected to the VPN, that laptop can both see and be seen by
the server and it has bidirectional file editing working too - so it
is not some setting in my modem/router.

I have made sure the Workgroups match and that all firewalls and
antivirus programs are completely turned off. My guest account on the
laptop is enabled (if that makes any difference).

Also one quirky thing - when I'm connected via VPN from home, my
Internet and email don't work. I know I can uncheck the Default
Gateway box to make those work, but then the file sharing doesn't
work. I don't know if this is related.

Any help is greatly appreciated.
.

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