Re: how to use expressions on a stealth interface

[Erek Adams <erek () snort org>]

On Wed, 26 Mar 2003, Thomas Uczekaj wrote:

> I have setup an interface in stealth mode (no IP assigned to the
> interface, the switch port has been setup to do spanning so I can see
> all traffic on the subnet).  When I run snort in sniffer mode (snort -i
> intf1 -ve net 10.67.2.0/24), the expression syntax to filter the data
> does not work.  It doesn't seem to recognize any of the data as normal
> IP.  However, when I run it without any expressions (snort -i intf1
> -ve), statistics report back about pct's for TCP/UDP/.....etc).
>
> Similarly, tcpdump cannot use expressions to filter the data.  Does
> anyone have an idea of using either of these tools to make this happen?

It works for me with both Snort and tcpdump.  I have the feeling your
troubles are coming from your shell and not from the programs.

Try:

        snort <options> 'net 10.67.2.0/24'

And see what you get.  :)

Cheers!

-----
Erek Adams

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


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