You could use a VPN for this.
Some VPNs (like PPTP) work at the "Data Link" layer. These would make your
private, internal IP address visible out on the Internet, to any other
computer running the appropriate PPTP client software and armed with the
appropriate secret key.
The best way to do this is to purchase a VPN router supporting PPTP
(SnapGear, for example). Then any Windows XP machine can use the Windows XP
client to establish a VPN connection. Thereafter the XP machine will access
a new "virtual" interface that will have an IP address from the private
subnet in your office, and you'll be able to access the target machine using
the same local IP address that you use when inside your office.
Other types of computers (besides Windows XP) also have PPTP clients. Often
they are available free of charge.
Note that not all VPNs work at the Data Link layer. Some run at the
"Network" Layer. If you end up with an IPSec VPN your remote machine will
get an IP address from a different subnet and won't be able to use the local
IP address that you evidently need.
The notion of "Data Link Layer" versus "Network Layer" can be confusing.
I've published a paper on this subject that you might find helpful. It's
available here:
http://www.askmisterwizard.com/19520...LayerModel.htm
I hope this helps!
-Bob Bosen-
www.AskMisterWizard.com
Instructional videos for people with work to do
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