[SPAM] - RE: [Snort-users] Span/Snoop ports... - Email found in subject

Marc Hering mhering at ...13116...
Fri Mar 18 06:33:38 EST 2005

If I configured the port as a dot1q trunk would Snort understand that
traffic?    I need to mirror 2 switchs that are trunked together so I
can grab all the traffic..... 

-----Original Message-----
From: Lee Clemens [mailto:snort at ...13080...] 
Sent: Friday, March 18, 2005 9:28 AM
To: 'Ulric Eriksson'; Marc Hering
Cc: snort-users at lists.sourceforge.net
Subject: [SPAM] - RE: [Snort-users] Span/Snoop ports... - Email found in

That particular switch does support port mirring, as per the

Redirection of traffic from any port to a "sniff" port. (Any switching
port can be designated as a "sniff" port.)

But that would only be a port at a time, so it depends what you want to
monitor...even with a tap, is it possible to view all traffic going
through and amidst the switch?? i.e. without building 24/48 taps for
each connection? (I realize one tap for the uplink, but that would only
grab the outgoing/incoming traffic and not the LAN traffic)

-----Original Message-----
From: snort-users-admin at lists.sourceforge.net
[mailto:snort-users-admin at lists.sourceforge.net] On Behalf Of Ulric
Sent: Friday, March 18, 2005 9:16 AM
To: Marc Hering
Cc: snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] Span/Snoop ports...

On Fri, 18 Mar 2005, Marc Hering wrote:

> Hey Guys,
> I just deployed a Snort box to one of our data centers...and I ran 
> into a bit of a snafu.  We have a 2948G-L3 switch and want to snort on
> The problem is that a L3 switch doesn't suppprt a snoop port...Has 
> anyone found a way around this?

Depending on the IOS version, you should be able to use the "port
monitor" or "monitor session" commands.


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