Re: icmp pass rules

[Frank Knobbe <frank () knobbe us>]

On Fri, 2008-10-24 at 13:21 -0400, Stephen Reese wrote:
> So if I plan on filtering a host or subnet then use suppression
> otherwise stick to pass?

Depends. If you want to ignore a signature *as is* on an IP/network,
then use a suppression.

If you have to customize the signature to further refine the match (for
example, the ICMP redirect), or if you want to ignore the alerts between
two explicit IP's, then use a pass rule.

Keep in mind that when you use a pass rule, no further traffic matching
is done. If the pass rule matches, then Snort stops evaluating any other
sigs. (at least if the processing order is changed to pass->alert->log).
Using suppressions, Snort will ignore that alert, but continue to match
the packet against other signatures.

-Frank


-- 
It is said that the Internet is a public utility. As such, it is best
compared to a sewer. A big, fat pipe with a bunch of crap sloshing
against your ports.

Attachment: signature.asc
Description: This is a digitally signed message part

-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/

_______________________________________________
Snort-users mailing list
Snort-users () lists sourceforge net
Go to this URL to change user options or unsubscribe:
https://lists.sourceforge.net/lists/listinfo/snort-users
Snort-users list archive:
http://www.geocrawler.com/redir-sf.php3?list=snort-users