[Snort-users] Snort multiple sensor configuration

Matt Olney molney at ...1935...
Thu Oct 9 16:21:50 EDT 2008

Bah...I can't stand IOS on Cat switches.

Check your port statistics (I don't have a Cisco switch available to me) but
look for buffer failures or dropped packets either outbound or inbound.


On Thu, Oct 9, 2008 at 4:09 PM, Stephen Reese <rsreese at ...11827...> wrote:

> > Yes! excellent point.  This is a very common deployment error.  use
> > mrtg or snmp to watch for dropped packets on the switchport that the
> > sensor is plugged into.
> >
> > for example, using a 10/100 port to monitor a switch with 48 ports, I
> > can just about guarantee that snort will drop no packets at all.
> > because it's only going to get one percent or less of the total traffic.
> I'm using monitor session to monitor the port that the internet and T1
> feed into the main network:
> monitor session 1 source interface Fa0/1
> monitor session 1 destination interface Fa0/3
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