netbsd Help for ipv6

[itojun@iijlab.net]

>Does anyone know what might cause this warning?
>Sep 16 15:05:33 reva /netbsd: nd6_lookup: failed to add route for a
>neighbor(3ffe:80c0:0220::0034), errno=17
>(My address = 3ffe:80c0:0220::0035; remote address = 3ffe:80c0:0220::0034;
>default route for inet6 = 3ffe:80c0:0220::0034)

	i guess you are using netbsd
	if you configure your tunnel interface like below, the above
	message will appear.
	# ifconfig gif0 A B prefixlen 127
	# ifconfig gif0 A B prefixlen 64

	correct configuration is like this.
	# ifconfig gif0 A B prefixlen 128

itojun