Re: Portscan2...

[Tobias Rice <rice () up edu>]

Erek-
Thanks for the tips, I'll try the ignore options and see if it works for 
me. But I.m a little confused about the BPF filters, the man page is a 
little vague.
Currently, I.m running snort like so:
/usr/sbin/snort-mysql+flexresp -o -i eth0 -c /etc/snort/snort.conf

So would it now be: (after creating the file scan.bpf)
/usr/sbin/snort-mysql+flexresp -o -i eth0 -c /etc/snort/snort.conf .F 
bpf_file: /etc/snort/scan.bpf
And the file scan.bpf would contain this:
not host 111.222.333.444 and not port (53 or 5060)

Thanks again!


On Sat, 22 Mar 2003, Erek Adams wrote:

> 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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