Re: Snort and network taps

[Jeff Nathan <jeff () snort org>]

Jason Haar wrote:
> I am finding this discussion on taps a real eye-opener - having never used
> them before myself. I'm a bit confused about what's going on. Why is
> everyone talking about two taps? A tap acts like a 2-port hub with one port
> "broken" (i.e. read-only) - so one tap would see all traffic going to and
> from the box you are monitoring wouldn't it?
>
> What have I missed? Someone paint me a picture? ;-)
>
> --
> Cheers
>
> Jason Haar
>
> Information Security Manager
> Trimble Navigation Ltd.
> Phone: +64 3 9635 377 Fax: +64 3 9635 417

Taps are designed to be used with analyzers.  The transmit pair from
each side of a connection is broken out into it's own port.  These two
tap ports then need to be recombined for snort.

Remind me after CanSecWest and I will put up the drawings I made as part
of the presentation Brian and I are doing.  They will help clarify the
use of taps.

-Jeff

-- 
http://jeff.wwti.com            (pgp key available)
"Common sense is the collection of prejudices acquired by age eighteen."
- Albert Einstein

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