Watching /var/log/pflog grow

[cpghost]

On Tue, Nov 04, 2008 at 09:22:42PM -0500, Sahil Tandon wrote:
> cpghost <cpghost at cordula.ws> wrote:
> 
> > How can I watch /var/log/pflog grow with tcpdump, "tail -f" style?
> > 
> > This won't work:
> >   $ tail -f /var/log/pflog | tcpdump -n -s 116 -r -
> > because tail doesn't start at the right location.
> 
> [...]
> 
> > I'm afraid that in the latter case, every packet will be
> >   EITHER logged by pflogd
> >   XOR    displayed by tcpdump.
> > Is that so?
> > 
> > If yes, /var/log/pflog would be incomplete, because some packets
> > would have been snatched away from pflog0 by tcpdump, before
> > pflogd ever got a chance to read them out.
> > 
> > Is there a way to watch /var/log/pflog grow, while
> > still making sure that pflogd logs EVERY packet that appears
> > on the pflog0 interface? How?
> 
> According to pflogd(8):
> 
>    Display the logs in real time (this does not interfere with the
>    operation of pflogd):
> 
>           # tcpdump -n -e -ttt -i pflog0

EOUTOFCAFFEINE

I actually read the man page, but I didn't pay attention to this.
Sorry for the noise and thanks for pointing it out.

-cpghost.

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