remove strong check against IPv4 compatible address. this (wrongly) forbids RFC1933 relaying case.  we'll enable it if mech-xx is updated to forbid relaying case.
remove strong check against IPv4 compatible address.
this (wrongly) forbids RFC1933 relaying case.  we'll enable it if mech-xx
is updated to forbid relaying case.

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame