I get a lot of these in my tcpdump on my machine:
15:45:47.427003 IP basement.ipp > 192.168.1.31.ipp: UDP, length 129
15:45:48.427004 IP basement.ipp > 192.168.1.31.ipp: UDP, length 167
192.168.1.31 is my broadcast address, and basement is me. They usually
come in pairs like this, though sometimes split up by other
traffic. Always, though, its one of length 129 and one of
167
A
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