Yes. The first problem to overcome is that when you dialup, your DEFAULT GATEWAY becomes your dialup ISP.. the DSL connection is still active though, you just cannot get to it!
Solution (windows):

What is your DSL default gateway IP address? take a note of that. X.X.X.X

What is the IP address of the OFFICE machine you wish to reach?. Y.Y.Y.Y

What is the address of your DIALUP default gateway? Z.Z.Z.Z

Create a .BAT file with the following commands in it:

echo "Pointing back to DSL"
route delete 0.0.0.0
route add 0.0.0.0 mask 0.0.0.0 X.X.X.X metric 1
route add Y.Y.Y.Y mask 255.255.255 Z.Z.Z.Z metric 1

The first command deletes the dialup default gateway entry.
The second command tells your PC the new default route is your DSL line.

The third command says the default route for your office server Y.Y.Y.Y is the dialup line.

If your dialup has reset your DNS server, you may wish to add another route command

route add A.A.A.A mask 255.255.255.255 Z.Z.Z.Z metric 1

where A.A.A.A is your office DNS server, (assuming it can resolve internet addresses).


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