Re: BPF problem

[James Lay <jlay () slave-tothe-box net>]

On 2014-07-11 12:05, Mike Patterson wrote:
> On Jul 11, 2014, at 2:00 PM, James Lay <jlay () slave-tothe-box net> 
> wrote:
>
> > On 2014-07-11 11:55, Mike Patterson wrote:
> > > On Jul 11, 2014, at 1:49 PM, waldo kitty <wkitty42 () windstream net>
> > > wrote:
> > >
> > > > On 7/11/2014 1:34 PM, Mike Patterson wrote:
> > > > > Following up to myself: I’ve tried various permutations of my BPF
> > > > > filter to
> > > > > no avail. I tried Snort versions 2.9.5.3 (which is what’s on my 
> > > > > old
> > > > > sensor),
> > > > > 2.9.6.0, and 2.9.6.1. Always, Snort says it’s reading my BPF
> > > > > filter, and
> > > > > always, it’s including alerts for IPs and networks that are in 
> > > > > the
> > > > > filter.
> > > > >
> > > > > My current filter is of the form:
> > > > >
> > > > > not (net 1.2.3.4/8 or not net 10.0.0.0/24 or not 172.16.12.1)
> > > >
> > > > this may not be related to your problem but i can't help seeing 
> > > > the
> > > > double
> > > > negatives in the above... are you wanting to include or exclude
> > > > traffic to/from
> > > > 10.0.0.0/24 and 172.16.12.1?
> > > >
> > > > if you want to exclude traffic from them, perhaps you mean to use
> > > >
> > > > not (net 1.2.3.4/8 or net 10.0.0.0/24 or 172.16.12.1)
> > >
> > > That’s actually what I’m using, I just can’t transcribe properly.
> > >
> > > Mike
> >
> > Give:
> >
> > not (net 1.2.3.4/8 or net 10.0.0.0/16 or 172.16.12.1)
>
> No joy.
>
> Mike

This worked for me ok:

sudo snort -i eth0 -c snort/snort.conf not net 10.0.0.0/8

You can also test just BPF ability with:

sudo snort -i eth0 not net 10.0.0.0/8

James

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