how to force outgoing IP?

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hi!

i have a machine with private 192.168 and a public IP (ppp).
i use free s/wan ipsec for a vpn to a similar gateway.
the ipsec interface has the same adress as my ppp interface
(the public one) but the route thru the interface points to
another private 192.168. subnet. 

my problem is this:

programs on one gateway trying to reach a private IP behind the
other gateway bind to the (public) addr of the ipsec-interface
because of the route there. and that public ip isn't part of the
vpn so they can't reach the other side.

how can i - based on the destination - force all programs to use
the private ip as source?
i heard "ip route change" can do this - but the help output doesn't
tell me how. thanks!

   ...Frank

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