change source and destination port simultaneously

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Hello list,

Can anyone suggest what's the best way/module to achieve the following? Am using kernel 2.4.24.

packets going to remote host
-----------------------------

(src) local_IP/local_port    (dest) remote_IP/remote_port

changes to -

(src) local_IP/portX       (dest) remote_IP/portY


packet coming from remotehost
-----------------------------

(src) remote_IP/portY       (dest) local_IP/portX

changes to -

(src) remote_IP/remote_port      (dest) local_IP/local_port


Thanks in advance.

Best regards,

Dhiraj Bhuyan



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