Assuming you're on linux, I'd recommend skipping perl and using iptables to take care of this. 

iptables -A PREROUTING -i <interface> -s <sourceip> -p tcp -m tcp --dp
+ort <port> -j REDIRECT --to-ports <newport>

[download]

There's also an option to specify a source network instead of a single IP.

In reply to Re: Socket Traffic Cop by Crackers2
in thread Socket Traffic Cop by sans-clue

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