[Snort-users] Configuring Cisco switches...

Bob Staaf rstaaf at ...1457...
Fri Sep 21 07:38:04 EDT 2001


Bryan,

     If he is so set against hubs his only other choice is to set up the
network monitoring port using span on the switch.  I don't see any other way
to do it without putting snort on every box you want to monitor.

Bob

----- Original Message -----
From: "Bryan Childs" <bryan.childs at ...3120...>
To: "'Erek Adams'" <erek at ...577...>
Cc: <snort-users at lists.sourceforge.net>
Sent: Friday, September 21, 2001 10:21 AM
Subject: RE: [Snort-users] Configuring Cisco switches...


> Ok - after talking to my net admin chappy - he has another question, and I
> quote :
>
> "it would be better to ask of the best way to set up an ethernet network
to
> optimise your chances of capturing information whilst maintaining high
> performance switched networks"
>
> and he said to ignore any smart arses that suggested going back to using
> hubs :)
>
> Well ?
>
> Anyone got any good advice on this...
>
> On the face of it - turning on the port mirroring on the switch sounds
like
> it will do the job - but will anything suffer noticeably after we've done
> it? (Apart from the snort box, we're expecting that!)
>
> Bry
>
>
> > -----Original Message-----
> > From: Erek Adams [mailto:erek at ...577...]
> > Sent: 21 September 2001 15:15
> > To: Bryan Childs
> > Cc: 'snort-users at lists.sourceforge.net'
> > Subject: Re: [Snort-users] Configuring Cisco switches...
> >
> >
> > On Fri, 21 Sep 2001, Bryan Childs wrote:
> >
> > > Hi everyone - this question has probably been done to
> > death, but my google
> > > searching for answers has amounted to nought - so I'm going
> > to have to ask
> > > it again I'm afraid!
> >
> > It's Ok, we'll just give you lashes with a wet noodle.  ;-)
> >
> > > The network here in my building is of course suffering from
> > the recent Nimda
> > > virus/worm breakout, and we're trying to track infected
> > boxes with snort.
> > >
> > > The entire network here is running on switched ethernet,
> > which is giving us
> > > a bit of a headache. Most of the switches are dumb 3Com
> > supplied ones, but
> > > we've been sensible enough (we think) to plug out snort box
> > into the Cisco
> > > one which sits at the top of the network.
> > >
> > > The trouble is that we *still* don't seem to be able to
> > monitor attacks
> > > which don't directly go for the snort box itself.
> > >
> > > The card is set up in promiscuous mode as it should be -
> > but we think we
> > > need to do something to the switch to make sure it sees ALL
> > our internal
> > > network traffic.
> > >
> > > Does anyone know what we might have missed? Or have any
> > suggestions at all?
> >
> > Yeppers...
> >
> > http://snort.sourcefire.com/docs/faq.html#1.8
> >
> > Now, your Cisco _should_ be able to do that.  If you don't
> > know talk with your
> > local netoworking geek.  Bribe him with some wire ties or something...
> >
> > > Cheers amigos......
> >
> > Oh, you're bringing the beer?  Great!  Bring some Shinerbock.  :)
> >
> > -----
> > Erek Adams
> > Nifty-Type-Guy
> > TheAdamsFamily.Net
> >
>
>
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