vcpe/l2tp/xl2tpd/contrib/pfc.README

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Source: http://www.fli4l.de/en/home/news/
If pppd supports "active precompiled filters", you can use this
utiliy to generate them. This is useful for preventing the pppd
to bring an on-demand connection up by spurious traffic, such
as ntp or routing protocol packets.
usage: pfc <expressiona> > /etc/ppp/your.active.filter
(specify precompiled-active-filter=/etc/ppp/your.active.filter in the ppp
options file)
example: ./pfc ntp and ldap