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I'm writing a simple client to ping a server with a packet on port 7 (echo) and then waiting for a reply. Is there a server that I can use to test this?

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2 Answers 2

up vote 1 down vote accepted

Here is a simple echo server:

sudo socat PIPE TCP-LISTEN:7,fork
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sudo: socat: command not found –  Amit Apr 25 '12 at 12:08
sudo nc -vvlp 7 -e /bin/cat

If you happen to have a inetd installed, most of them have echo built-in. Snippet from /etc/inetd.conf:

echo   stream  tcp nowait  nobody  internal
echo    dgram   udp wait    nobody  internal
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(with nc.traditional / the one by Hobbit) –  Tobu Jan 30 '10 at 22:15
Tobu: Works fine on GNU netcat too. –  grawity Jan 31 '10 at 17:42

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