[Snort-users] BPF Filters

Y M snort at ...15979...
Fri Nov 14 16:19:22 EST 2014



> From: bturnbough at ...15650...
> To: snort-users at lists.sourceforge.net
> Date: Fri, 14 Nov 2014 21:06:56 +0000
> Subject: [Snort-users] BPF Filters
> 
> Hi All,
> 
> I've been running snort for quite a while now with no problems.  I would like to set up a BPF filter to ignore ESP encapsulated traffic.
> 
> As a test, I created a file called snort-em1.bpf and placed the following rule in it:
> 
> !(src net 192.168.10.0/24 && dst port 22)
> 
> 
> Then I attempted to start snort:
> 
> /usr/sbin/snort -i em1 -u snort -g snort -c /etc/snort/snort-em1.conf -f /etc/snort/bpfs/snort-em1.bpf -l /var/log/snort/em1
Shouldn't "-f" above be "-F"?
 -f         Turn off fflush() calls after binary log writes -F<bpf>   Read BPF filters from file <bpf>

YM
> 
> However, snort refuses to start:
> 
> ERROR: Can't set DAQ BPF filter to '/etc/snort/bpfs/snort-em1.bpf' (pcap_daq_set_filter: pcap_compile: syntax error)!
> 
> 
> Can someone please help me?
> 
> Brad
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