[Snort-users] Switched network woes..

d'Ambly, Jeff jdambly at ...3616...
Mon Jan 14 08:47:06 EST 2002

Make a box with a bunch of NIC's, I have one box with six Ethernet

 -----Original Message-----
From: 	Joe Pampel [mailto:joe at ...3851...] 
Sent:	Monday, January 14, 2002 10:16 AM
To:	snort-users at lists.sourceforge.net
Subject:	[Snort-users] Switched network woes..

Hi all..

It was the best of times, it was, well, also a pain in the rear. No more
hubs for my little corner of the universe and now that the firewall is
clustered I am presented with an irritating IDS situation:

Each switch only allows one port to be mirrored - eg: one monitor port and
one port where you watch all traffic. (Nortel 450-24T's fwiw) The switches
that the firewalls go into are cascaded, (one FW nic into each sw) on both
the inside and outside.. so it would appear I need 4 sensors just to watch
the firewalls now.. is there a shortcut for this? (short of plugging back
into hubs!) it would be nice if there was some way to sniff off the VIP of
the FW cluster.. although I don't see how that would work... I can get it
down to 3 easily by just monitoring the edge router ethernet port and
massaging the snort config to ignore all the stuff that's not ours.. how can
I get back to 2 sensors?

Any brilliant shortcuts for this? I don't see any way around 3-4 sensors but
just thougth I'd ask.. If the cluster expands I won't be able to fully
monitor it.. and I've gotten really used to monitoring it. 


- Joe

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