Re: Rule Selection

[Rudi Starcevic <tech () wildcash com>]

Hi,

>>  Depends on what your're looking for. I run some snort sensors "wide 
open" in order to monitor and profile all the attacks
>> that are occuring. In other cases, only selected rules are 
enabled.Miner, Jonathan W (CSC) (US SSA) wrote:

Well I am very interested to know all attacks that may be ocurring but 
network performance is our main concern.
This box is a commercial web app that stream digital media so it must 
have the best network speed it can.

Let say only port 80 is open.
Which of the two would run faster

a) Smort with all rules loaded
b) Smort with only port 80 rules loaded.

I tend to think it makes no difference. If port 80 is not being used 
snort will not apply those rules.
Am I correct?

Cheers
Rudi




Depends on what your're looking for. I run some snort sensors "wide 
open" in order to monitor and profile all the attacks that are occuring. 
In other cases, only selected rules are enabled.

> For example, if your firewall only allows Port 80 traffic, then running snort with "all" the rules behind the firewall will alert 
> you to other traffic that might be "leaking" through.
>
>
> 	-----Original Message----- 
> 	From: snort-users-admin () lists sourceforge net on behalf of Rudi Starcevic 
> 	Sent: Thu 02/10/2005 01:30 PM 
> 	To: snort-users () lists sourceforge net 
> 	Cc: 
> 	Subject: [Snort-users] Rule Selection
>         
>         
>
>         Hi,
>         
>         A colleague of mine suggested to me that a machine with only port 80
>         open ( www server ) one should only use www Snort rules.
>         That would mean not using alot of available rules for intrusion
>         detection, is that wise ?
>         
>         Thanks
>         Best regards
>         Rudi
>         
>         
>         
>         
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