[Snort-users] IDS Placement ideas for inside and outside a fi rewall.

FWAdmin FWAdmin at ...8484...
Thu Apr 3 05:33:34 EST 2003

That's a good point, internal IMO is more important than external. It
definitely takes some tuning to get the external IDS working the way you
like. The placement of IDS outside works as an early warning system. Sure
your firewall may be blocking the initial attack traffic, but it may lead up
to something that could get through if no action is taken. I don't know
about anyone else, but I don't sit in front of Check Point SmartView Tracker
24x7 and watch logs for attacks :) I check them once a day. So in the 24
hour period between the checks, who knows what is going on? Besides,
firewalls don't do a great job of detecting intrusions and giving
information as to what's going on. And they shouldn't. That's really not the
purpose of a firewall.

-----Original Message-----
From: David Glosser [mailto:david_glosser at ...131...] 
Sent: April 3, 2003 03:10
To: Brei, Matt; FWAdmin; snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] IDS Placement ideas for inside and outside a

If you've never set up any IDS before, I'm not sure you would want to place
it outside your firewall immediately You'lll get overwhelmed with
probes,scans, script kiddies etc. 
First place the box (with the "snorting" NIC unnumbered). On the port
monitoring the *internal* interface of your firewall. Let it work on all of
the stuff your firewall lets through. Once you have that under control, then
place another box (or another NIC on the same box) to monitor your internal
servers (since breakins can come from internal users). 
Once you have these two under control, then you can worry monitoring stuff
outside the firewall,  which I believe is called *attack detection*. But do
you care that much about the stuff your firewall is successfully blocking?

 I am trying to convince my company to implement IDS on our network but I
have a few questions. I know I would want one on both sides of the firewall,

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