RE: Snort Sensor Placement Outside Firewall

[Erek Adams <erek () snort org>]

On Wed, 25 Jun 2003, Michael Steele wrote:

> You forgot to mention the time that may be involved in sorting through the
> massive amount of data with a sensor on the outside.

More like "didn't mention" vs. "forgot".  Usually unless someone is just
feeling masochistic, the information overload from outside the firewall is
usually changed/toned down ASAP.

> What could be some of the possibilities that make that scenario a possible
> solution, when the IDS could or should in most cases be placed on the near
> side of the firewall?

        http://www.theadamsfamily.net/~erek/snort/ids_placement.txt

That one has been beaten to death so many times it's not even funny.  You
can place it before or after the FW, but I think that's a choice that has
to be made after testing.  I don't think there is a hard and fast answer
to 'where?'.  You're going to almost always have to test/retest to check
out how it works and how you want to handle it.

Cheers!

-----
Erek Adams

   "When things get weird, the weird turn pro."   H.S. Thompson


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