>However, I think that we should have a way to set the interface
>identifier manually. DAD on the link-local address will detect double
>use. How difficult would it be to make this settable?

	just invoke the following two commands.
	fe80:1::xxxx: the address you already have on the interface
	fe80:1::yyyy: the address you would like to have
	# ifconfig ne2 inet6 fe80:1::xxxx -alias
	# ifconfig ne2 inet6 fe80:1::yyyy prefixlen 64 alias

itojun