RE: [Snort-users] Snort on Cisco 6509

The IP address is the same as what? No no ...you don't
even need an IP address on the Snort promiscious
adapter. You should have at least two adapters. One
for management and one for sniffing.

You can't monitor a Gigabit connection with a Mbit
connection. Put the firewall on a Mbit connection.

Cheese!

Marc


--__--__--

Message: 1
Date: Mon, 30 Aug 2004 14:28:36 -0400
From: Network Intern <nsintern@hamilton.edu>
To: snort-users@lists.sourceforge.net
Subject: [Snort-users] Snort on Cisco 6509

Hi Everyone,

We have SNORT 2.0.2 running on Red Hat Linux release 9
(Shrike). We are monitoring the traffic that enters
and exits our PIX firewall. Snort was up and running
very well, until we had to make some network changes.
Initially snort was connected to a Cisco 35xx series
switch and was spanning (port monitoring) the
interface connected to our firewall.

Currently we have connected the firewall directly to a
Giga bit interface on our core switch (Cisco 6509) and
hence we had to shift the location of snort to be
connected directly to a 100 Mbit connection on the
6509. Currenlty we have set spanning on the 6509's 100
Mbit connection, to which snort is connected to
monitor the Giga bit connection that is connected to
the firewall.

However SNORT is not able to detect any alerts other
than those to its own interface. So if we were to scan
snort it would show up, but if we tried to scan the
firewall it would not show up. The IP address of Snort
is the same as the 100Mbit port on the 6509 is put on
the Vlan that snort was configured. I noticed that the
NIC was not in promiscuous mode so I set it to be in
promiscuous mode.

The output of the show span from the 6509 is
************************************************** ********************
CJ_6509> (enable) show span

Destination : Port 3/8
Admin Source : Port 7/15
Oper Source : Port 7/15
Direction : transmit/receive
Incoming Packets: enabled
Learning : enabled
Multicast : disabled
Filter : -
Status : active


Total local span sessions: 1
*********************************************8

It would be of great help if you would kindly drop in
some suggestions
Thanks a lot
Sherly Abraham
nsintern@hamilton.edu
Network Services
Hamilton College


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