I installed Snort last week. Amazing bit of kit it is, and along with
ACID (http://www.cert.org/kb/acid/) provides a good report of what the
network is doing.
Unfortunetly there are some misbehaving boxes around. A Zyxel ISDN TA is
misbehaving on another IP network (same physical network though) and
it's sending traceroutes to the broadcast address for that network. That
in turn is being picked up by Snort and reported.
I'd like to figure out some way of ignoring stuff from that other
network if possible.
The machine Snort is running on is a Linux kernel 2.0.36 box using
ipfwadm, Snort sets the interface to promiscious, but I'm not sure how
to block out the other network traffic because it's not clear to me that
it's either incoming or outgoing traffic (it's a different network after
all!). Have I confused you all enough now? I'll just go lie down..
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