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Re: Snort Help - Network IDS
From: Matt Mercer <mattm () pyramidcorporation com>
Date: Thu, 15 Apr 2004 08:44:11 -0600

Your switches likely support a feature which allows them to "mirror"
traffic from a number of switchports to another arbitrary switchport,
allowing you to sniff traffic without introducing a single point of
failure.

Depending on how much traffic is hitting those switches, you might have
to play with how many ports are being mirrored to each monitoring port. 
Also, I've honestly never monitored 100 production servers, but I'm
guessing you'll need a number of decent machines to handle the sniffing,
possibly with multiple NICs.  There's likely snort documentation to
advise you on capacity planning here.

If you are using UTP and want to get real paranoid (in an environment
that size, I'm guessing you are =), you could even build a receive-only
Ethernet cable to connect to one NIC for snort to sniff, and put another
NIC on a seperate and dedicated VLAN to syslog your snort alerts, 
perform remote administration, etc.

HTH,

-Matt


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