Anybody know meaning or operational significance of "Unknown UDP session
identifier; data unit dropped" in the nettl log?  It happens repeatedly,
though not synchronized with any obvious NetView or user operation, or
traps.  There's no IP, source, or other information in the log- lots of
question marks in the data in the log.

This is a network which may have a lot of extraneous protocols on it, so
it's probably garbage, but if I could pin it down, it might be useful.