Snort on Cisco 6509

[Network Intern <nsintern () hamilton edu>]

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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