Outgoing DNAT, incoming SNAT?

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I know it's possible to perform SNAT on outgoing packets and DNAT on
incoming ones, for purposes of IP masquerading, but is it possible to
perform DNAT on outgoing packets and SNAT on incoming packets that
match specific IP addresses, or specific IP addresses and ports?

I have a client program which doesn't allow me to alter the IP/ports to
which it connects, and seeing as I can't compile from source, this
would allow me to use a different IP which is accessible and that in
turn connects to the server through port forwarding.

Matt

.

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