Re: Portscan2...

[Tobias Rice <rice () up edu>]

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.
Thanks again!


On Sat, 22 Mar 2003, Erek Adams wrote:

> On Sat, 22 Mar 2003, Tobias Rice wrote:
>
> > I'm using portscan2, and I'm getting many alerts from myself:
> > (spp_portscan2) Portscan detected from 111.222.333.444: 21 targets 21
> > ports in 0 seconds
> > (names changed to protect the innocent)
> >
> > Mostly DNS lookup I think (port 53)
>
> 53 UDP for lookups, TCP 53 for zone x-fers.
>
> > So, how do I prevent this? I tried this:
> > preprocessor portscan2-ignorehosts: 111.222.333.444
> > and now I don't get any alerts when I'm portscanned.
>
> It's working exactly as it should.  Ignore host 111.222.333.444 with
> regards to any type of portscan.  It should only ignore it as the source,
> not as the dest.  I can't speak on that 100% without looking thru the
> code.  If you're scanning yourself from that same box, then that is the
> expected behavior.  I'd suggest using something like grc.com for a remote
> scan.
>
> > I want to ignore alerts from 111.222.333.444 port 53 and 5060, (or any
> > scans coming FROM me) yet still detect all other incoming scans.
>
> Use a BPF filter.
>
>       not host 111.222.333.444 and not port (53 or 5060)
>
> Only problem with this is that if you have a dynamic IP, you'll have to
> redo the filter with each IP change.  Granted a little scripting and this
> becomes a non-issue.  :)
>
> Cheers!
>
> -----
> Erek Adams
>
>    "When things get weird, the weird turn pro."   H.S. Thompson
>
>
> -------------------------------------------------------
> This SF.net email is sponsored by:Crypto Challenge is now open! 
> Get cracking and register here for some mind boggling fun and 
> the chance of winning an Apple iPod:
> http://ads.sourceforge.net/cgi-bin/redirect.pl?thaw0031en
> _______________________________________________
> 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



-------------------------------------------------------
This SF.net email is sponsored by:Crypto Challenge is now open! 
Get cracking and register here for some mind boggling fun and 
the chance of winning an Apple iPod:
http://ads.sourceforge.net/cgi-bin/redirect.pl?thaw0031en
_______________________________________________
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