Pull up following revision(s) (requested by maxv in ticket #672):
sys/netinet6/in6_proto.c: revision 1.120
Change ip6_hdrnestlimit to be 15 instead of 50. I couldn't find any
reference in RFCs about what a correct limit should be, but FreeBSD already
uses 15.
If an IPv6 packet has 50 options, there is clearly something wrong with it.

(martin)