Is there a Windows tool for capture and playback of modified UDP packets?

The BitTwist ( http://bittwist.sourceforge.net ) editor commandline program ( bittwiste ) allows you to change the destination IP address (and port number) amongst other things.

You mention Colasoft Packet Player and it sounded like a useful tool, so I checked it out. While checking their site I found they also have Packet Builder.

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