In-Reply-To: <BAY19-F385a0q6AGvN4000177b6@hotmail.com>
Having your IDS on the outside of your firewalls does not tell you what is
getting through your firewalls. It does not help you from an IDS perspective...
just assume that everything is going to hit the outside of your firewall (every
random sweep or port scan). If your firewalls are bounded by IDS and you
correlate both aspects with your firewall logs you have a clearer picture of
what your threats look like.
Dear List
I have moved into an organization that has two RealSecure Network Sensors
and a network architecture that is VLANd/DMZd to where localized deployment
to capture traffic would require 8 to 12 sensors to avoid bridging loops.
The cheapest/simplest option (without deploying SNORT/Prelude, etc - the
organization wants to remain on a single application architecture where
possible) is to place the two sensors outside of the firewall.
I understand that this means:
The sensors will be in hostile territory and need to be maintained to a very
high degree
There will be an operations overhead of dealing with all of the noise that
would normally be filtered by a firewall
Does anyone have experience of doing this?
Are there any other issues that I have not considered?
Chris
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