In some email I received from The Source of All Evil, sie wrote:
> 
> 
> matt
> Wed Apr 29 14:37:53 PDT 1998
> Update of /cvsroot/src/sys/conf
> In directory nb00:/tmp/cvs-serv16194/conf
> 
> Modified Files:
> 	files 
> Log Message:
> Add support for "fast" forwarding.  Add hooks in if_ethersubr.c and 
> if_fddisubr.c to fastpath IP forwarding.  If ip_forward successfully
> forwards a packet, it will create a cache (ipflow) entry.  ether_input
> and fddi_input will first call ipflow_fastforward with the received 
> packet and if the packet passes enough tests, it will be forwarded (the
> ttl is decremented and the cksum is adjusted incrementally).

does ipflow_fastforward call the pfil(9) hooks, amongst the many tests ?

Darren