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neuthral/nc_udp.md

Created August 7, 2022 18:08
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NetCat test UDP ports
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nc_udp.md

To test if udp port is responding, use netcat.

An example from the man page:

nc -v -u -z -w 3 example.host 20-30

Send UDP packets to ports 20-30 of example.host, and report which ones did not respond with an ICMP packet after three seconds. Of course, if a firewall is DROPing, which is normally the case when dealing with internet-faced gateways, you won't receive an ICMP response.

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