pfc - active precompiled filters generator

       This manual page was written by Roberto C. Sanchez <roberto@connexer.com>, for the  Debian  project  (but
       may be used by others).

                                                October 30, 2008                                          PFC(1)

       This manual page documents briefly the pfc command.

       pfc  is  the Precompiled Filter Compiler - a tool to generate "active precompiled filters".  If your pppd
       supports this feature, you can use this utility to generate the filter files.  The Active Filter allows a
       connect on demand pppd to determine what is 'interesting' traffic, and then  initiate  the  PPP  session.
       The  tool  allows you to create the filters, in libpcap format, for use by pppd.  Common filters are used
       to ignore traffic (ie: ntp, various protocol keepalives, etc...) so PPP sessions are not initiated  until
       'real' traffic requires them.

       Note  that the generated compiled filter expression is specific to point-to-point links, and differs from
       the format generated by tcpdump -ddd.

       (specify precompiled-active-filter=/etc/ppp/your.active.filter in the ppp options file)

       /usr/bin/pfc ntp and ldap > /etc/ppp/your.active.filter

       pfc - active precompiled filters generator

       pfc is from the FLoppy Isdn 4 Linux project - see http://www.fli4l.de/en/home/news/

pfc <expression> >/etc/ppp/your.active.filter