[Snort-users] Daemonlogger and BPF

Martin Roesch roesch at ...1935...
Mon Jun 7 01:10:09 EDT 2010

Hi Randy,

Your expression rejects all packets, as Jason said.  I think you want
to use "or" instead of "and" there.

Daemonlogger uses the same BPF file format as all libpcap-derived
programs (tcpdump, snort, etc).  I guess I should mention that in the
docs. :)  If you want to read up on it before I get an update out the
door just 'man tcpdump' and it should all be in there.


On Mon, Jun 7, 2010 at 12:15 AM, Randal T. RIoux <randy at ...13561...> wrote:
> I have a question about the file format for bpf filtering with Daemonlogger.
> The syntax isn't described anywhere. However, this is what I know.
> "port 80 and port 8080" works fine for the -f command line inclusion.
> "port 80 and port 8080 and port 8181" throws this error:
>    expression rejects all packets
> So, I guess my question really is: what is the proper formatting/syntax
> for BPF usage in Daemonlogger?
> Thanks!
> Randy
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Martin Roesch - Founder/CTO, Sourcefire Inc. - +1-410-290-1616
Sourcefire - Security for the Real World - http://www.sourcefire.com
Snort: Open Source IDP - http://www.snort.org

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