Re: Portscan2...

[Erek Adams <erek () snort org>]

On Sat, 22 Mar 2003, Tobias Rice wrote:

> Thanks you all for your responses!
> FYI, I am not scanning my server locally, I'm using a workstation.
> I'll try a BPF fileter and update you later.

Just to mention it:  There's also

        preprocessor portscan2-ignoreports-to:
        preprocessor portscan2-ignoreports-from:

That may work as well as a BPF filter.

One thing that should be kept in mind, with either BPF filters or with
using ignore* options:  You can "blind" youself very easily.  You want to
be sure that you don't ignore _all_ traffic on port 53, or all traffic
from host <foo> unless you _really_, _really_ mean it.  It wouldn't do to
have a DNS server hacked because you ignore port 53.  :)

Also keep in mind that dropping thigs with a BPF filter causes Snort never
to see it.  It's dropped at the libpcap level, so it never even makes it
into Snort's processing engine.  That may be a slight performance gain in
some cases.

Cheers!

-----
Erek Adams

   "When things get weird, the weird turn pro."   H.S. Thompson


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