CODEWITHSUNDEEP
udpnetcatstatsddatadog
Nathan Hanna
Nathan Hanna

Reputation: 4943

Why isn't netcat udp message being recieved by netcat listener?

I have netcat listening for udp traffic on port 8125 in terminal 1

nc -ul 8125

and in terminal 2 I run the following (a test dogstatsd message for troubleshooting a datadog client connection):

echo "test_metric:1|c" | nc -u -w 1 -v localhost 8125
#found 0 associations
#found 1 connections:
#    1: flags=82<CONNECTED,PREFERRED>
#   outif lo0
#   src ::1 port 50397
#   dst ::1 port 8125
#   rank info not available
#Connection to localhost port 8125 [udp/*] succeeded!

I would expect to see test_metric:1|c show up in the output of terminal 1, but there is no output at all.

Can you help me understand why the udp message is not showing up and how to successfully send the udp message?

Upvotes: 2

Views: 1151

Answers (1)

Nathan Hanna
Nathan Hanna

Reputation: 4943

I still don't know why it makes a difference, but adding the -4 option made it work

echo "test_metric:1|c" | nc -u -4 -w 1 localhost 8125

Here's the man page on the option:

-4 Forces nc to use IPv4 addresses only.

Upvotes: 2

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