Re: Re : Re: What is the correct syntax for bpf_file?

[Miguel Alvarez <miguellvrz9 () gmail com>]

Thank you, Todd -- that was it!  I thought I was going crazy! :-)

Thanks again guys,

MA



On Wed, Jan 30, 2013 at 4:15 PM, Todd Wease <twease () sourcefire com> wrote:

> On Tue, Jan 29, 2013 at 4:05 PM, Miguel Alvarez <miguellvrz9 () gmail com>
> wrote:
> > snort-2.9.4 with libpcap 1.3.0.  And you're right, running 'tcpdump -i
> <iface> -vvnn src host 10.10.1.1' doesn't return anything but the alerts
> keep getting logged.  Why is that?!
> > Cheers,
> >
> > MA
>
> Like Rm Kml hinted at, it may be there's vlan.  Try "vlan and src host
> 10.10.1.1" with tcpdump and see if you get anything.  If so, your bpf
> should include vlan, e.g. "vlan and not src host 10.10.1.1".  If this
> doesn't work, can you attach a short pcap of the traffic?
>
> > On Tue, Jan 29, 2013 at 6:53 PM, Rm Kml <rmkml () yahoo fr> wrote:
> > > Thx, Im curious what is your snort version please ?
> > > Maybe you have vlan ?
> > > For example can you write network trafic with tcpdump like and replay
> file on tcpdump + snort with bpf ?
> > > Do you have same pb if you add bpf instructions on snort cmd line ?
> > > Regards
> > > Rmkml
> > >
> > >
> > > ________________________________
> > > From: Miguel Alvarez <miguellvrz9 () gmail com>;
> > > To: rmkml <rmkml () yahoo fr>;
> > > Cc: Snort Users <snort-users () lists sourceforge net>;
> > > Subject: Re: [Snort-users] What is the correct syntax for bpf_file?
> > > Sent: Tue, Jan 29, 2013 4:59:20 PM
> > >
> > > Thanks for the reply.  I just have one line just to test:
> > >
> > > not src host (10.10.1.1)
> > >
> > > But it's still triggering alerts after restarting snort.
> > >
> > > 01/29-16:56:07.106637  [**] [1:2010937:2] ET POLICY Suspicious inbound
> to mySQL port 3306 [**] [Classification: Potentially Bad Traffic]
> [Priority: 2] {TCP} 10.10.1.1:39944 -> 10.42.1.0:3306
> > > Any ideas?  I am very familiar with bpf syntax and use it on the
> command line with tcpdump all the time so this is very confusing!
> > > Thank you,
> > >
> > > MA
> > >
> > >
> > > On Tue, Jan 29, 2013 at 5:44 PM, rmkml <rmkml () yahoo fr> wrote:
> > > > Hi Miguel,
> > > > Please try this bpf: 'not src host (10.10.1.1 or 10.10.1.2 or
> 10.10.1.3)'
> > > > Regards
> > > > Rmkml
> > > >
> > > >
> > > >
> > > >
> > > > On Tue, 29 Jan 2013, Miguel Alvarez wrote:
> > > >
> > > > > I have a list of my nessus scanners in my /etc/snort/bpf_file but
> they're still triggering alerts.  I've got them listed in the following
> syntax for example:
> > > > > not (src host 10.10.1.1) &&
> > > > > not (src host 10.10.1.2) &&
> > > > > not (src host 10.10.1.3)
> > > > >
> > > > > And my snort process is pointing to it:
> > > > >
> > > > > /usr/sbin/snort -D -i eth6 -u snort -g snort -c /etc/snort/snort.conf
> -l /var/log/snort/eth6 -F /etc/snort/bpf_file
> > > > > And it shows up in the syslog when snorts starts:
> > > > >
> > > > > Jan 29 16:15:53 nids1 snort[940]: Reading filter from bpf file:
> /etc/snort/bpf_file
> > > > > Jan 29 16:15:53 nids1 snort[940]: Snort BPF option: not (src host
> 10.10.1.1) &&
> > > > > not (src host 10.10.1.2) &&
> > > > > not (src host 10.10.1.3)
> > > > >
> > > > > But the alerts keep streaming in (not just this alert):
> > > > >
> > > > > 01/29-16:36:28.235294  [**] [1:2003068:6] ET SCAN Potential SSH Scan
> OUTBOUND [**] [Classification: Attempted Information Leak] [Priority: 2]
> {TCP} 10.10.1.1:49870 -> 10.10.1.43:22
> > > > > This is snort 2.9.4.0 on CentOS 5.x.  What am I doing wrong?
> > > > >
> > > > > Thank you!
> > > > >
> > > > > MA
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