Re: Snort BPF.filter doesn't work

[Robert Millott <robm () millottandassociates com>]

unfortunately, my snort install is on a non-internet connected network so I
can't provide the .conf file.

my command to start snort is:

/usr/bin/snort -c /etc/snort/snort1.conf -G 0x11 --pid-path /etc/snort/
--nolock-pidfile --daq pcap --dap-dir /usr/lib64/daq --daq-mode passive -i
enps50f0 -F /etc/snort/bpf.filter -D

snort version is 2.9.6 GRE (Build 47)
host OS is 3.14.4 gentoo

Thanx for the help







On Thu, Jul 3, 2014 at 1:19 PM, Nicholas Mavis (nmavis) <nmavis () cisco com>
wrote:

>  Robert,
>
>  Can you provide the following:
>
>    1. Copy of your snort.conf
>    2. The syntax in which you are starting Snort
>    3. What version of Snort are you using?
>
> -Nick
>
>   From: Robert Millott <robm () millottandassociates com>
> Date: Thursday, July 3, 2014 at 1:16 PM
> To: nmavis <nmavis () cisco com>, snort-users <
> snort-users () lists sourceforge net>
> Subject: Re: [Snort-users] Snort BPF.filter doesn't work
>
>   Nick
>   Thanx for the suggestion. Unfortunately, same results.  The startup
> screen shows it reads the file, but the alert keeps showing up in my logs.
>
>
>
>
> On Thu, Jul 3, 2014 at 1:10 PM, Nicholas Mavis (nmavis) <nmavis () cisco com>
> wrote:
>
> >  Robert,
> >
> >  Try the following without any additions:
> >
> >  not host 192.168.1.1
> >
> >  -Nick
> >
> >   From: Robert Millott <robm () millottandassociates com>
> > Date: Thursday, July 3, 2014 at 12:14 PM
> > To: "snort-users () lists sourceforge net" <
> > snort-users () lists sourceforge net>
> > Subject: [Snort-users] Snort BPF.filter doesn't work
> >
> >   I am trying to filter some data.  I created a rule in my misc.rules
> > that I know will always fire, ie
> >
> >  alert tcp any any -> 192.168.1.1 80 (msg:"my test rule"; sid: 60999;
> > rev:1)
> >
> >  That rule fires constantly whenever I go to the website at 192.168.1.1
> >
> >  I then create a /etc/snort/bpf.filter that contains one line
> >
> >  !(host 192.168.1.1)
> >
> >  I then edited snort.conf and uncomment the bfp.filter line so it reads
> >
> >  config bpf_file: /etc/snort/bpf.filter
> >
> >  When I run snort and watch /var/log/messages, the above alert continues
> > to fire.
> >
> >  I also tried using it with the command line option of -F
> > /etc/snort/bpf.filter. This didn't work either.
> >
> >  I also tried bpf.filter to read
> > (not host 192.168.1.1)
> > that didn't work either.
> >
> >  When I start snort, I see the line that reads
> >
> >  Snort BPF Option:
> > !(host 192.168.1.1)
> >
> >  and yet I still see my above test alert message in my
> > /var/log/messages.
> >
> >  Anyone know why the bpf.filter isn't filtering the data?
> >
> >
> >
> >  --
> > Robert Millott
> > President, Millott and Associates
> > (443) 255-3588
>
>
>
>  --
> Robert Millott
> President, Millott and Associates
> (443) 255-3588



-- 
Robert Millott
President, Millott and Associates
(443) 255-3588

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