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I want to test some security on an NTP client developed in-house and would like to use netcat to do it. I have packets captured with Wireshark from previous NTP exchanges that I tried to feed to the client but that doesn't appear to be working.

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Perhaps these tools can help you:

PlayCap
Playback for Wireshark Captures

Tcpreplay

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tcpreplay doesn't do udp packets, which I need for ntp. PlayCap is handy, tho' – Ishpeck May 27 '11 at 16:54

Here is another great tool:
Ostinato, packet crafter and traffic generator

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You probably need to use netcat's -u option which tells it to work over UDP instead of TCP.

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