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I want to generate UDP packet to test a program, something equivalent to using telnet to test TCP port (Can telnet generate UDP packet?)

How can I do this?

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2 Answers 2

up vote 10 down vote accepted

One word: Netcat

Netcat is the go-to tool for this sort of thing.

You can thrash whatever port you choose with udp packets with something like:

nc -u host.example.com 53 << /dev/random

(53 is your port number)

Or you can send an actual file, or tell it to bind that port and listen as a service, or whatever you like.

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I don' think << is a valid Bash redirect. You probably mean <? –  mehaase Mar 21 '13 at 18:07

If you want to merely send one UDP packet with some specified data, as opposed to Satanicpuppy's answer which continuously sends random data, you can do:

echo "foo" | nc -w1 -u 111.22.333.4 20000
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