On Jul 25, 2007, at 3:47 PM, Andrew Sackville-West wrote:

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

IPP is Internet Printing Protocol. My guess is CUPS is probably set to broadcast to other systems so they can automatically discover printers.




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