I've seen this when Windows has a mis-configured subnet mask.  Remember,
Windows defaults to 255.255.0.0 for a 172.16.x.x address, and many network
admins forget and/or don't know to change it.  Windows sends all sorts of
broadcast stuff, and it'll all be sent to 172.16.255.255 if the mask is
mis-configured.

(I found this out while troubleshooting why an ISDN line kept dialing - the
router was routing all 172.16.255.255 packets to the 172.16.0.0/16 floating
static because there was no 172.16.255.0/24 network, and the floating static
was the longest match...  Turned out to be mis-configured masks on random
systems.)

Good luck.
--Wes


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