[Snort-users] icmp pass rules

Frank Knobbe frank at ...9761...
Fri Oct 24 13:38:44 EDT 2008

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.


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.

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