[Snort-users] BPF Filters

Turnbough, Bradley E. bturnbough at ...15650...
Fri Nov 14 16:06:56 EST 2014

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 && 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

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?

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