tcpdump
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tcpdump [1] is a packet analyzer [2] which is able to intercept and log networktraffic. Packet analyzers are particularly helpfull in detecting networking issues.
Example
In a terminal window type:
sudo tcpdump -i lo udp port 6454 -vv -X
The resulting output will show UDP datagrams which are captured on the loopback interface on port 6454 (Art-Net).