Testing for UDP Traffic

On the receiver run:

tcpdump host <ip of sender>

On sender run:

  echo "PING" > /dev/udp/<ip of receiver>/<port #>

Example:

Sender

$ echo "PING" > /dev/udp/192.9.20.115/6000"

Receiver

$ sudo tcpdump host 192.9.20.111
[sudo] password for jeverson:
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on enp0s25, link-type EN10MB (Ethernet), capture size 65535 bytes

12:13:51.616237 IP mc-server.all-offroad.net.37052 > kate.all-offroad.net.6000: UDP, length 5
12:13:51.616314 IP kate.all-offroad.net > mc-server.all-offroad.net: ICMP host kate.all-offroad.net unreachable - admin prohibited, length 41