>	it looks that in_pcbnotify() needs to flush inpcb.inp_route more
>	frequently for unconnected sockets, on ICMP redirect case.
>	scneario is like this:
>	- from unconnected inpcb, packet is sent to final destination A,
>	  using gateway B.  inpcb caches the routing entry into inpcb.inp_route.
>	- B was not the best gateway, so B sends an ICMP redirect.
>	- because we have used an unconnected inpcb, the inpcb will not be
>	  notified of ICMP redirect (see in_pcbnotify), and will keep an
>	  obsolete cache entry in inpcb.inp_route.
>	- ICMP redirects will be issued every time we send a packet from
>	  the unconnected inpcb, to A.
>	is my understanding correct?

	jinmei@kame found another issue - inpcb.inp_route will become bogus
	on inbound ICMP too big (or more fragment) packet.

itojun