[freebsd-net] Re: IPV6 problem : nd6_lookup: failed to add route for a neighbor

[Tuc at T-B-O-H.NET]

> 
> Tuc at T-B-O-H.NET wrote:
> 
> > 	But once I brought it all up, I got :
> > 
> > kernel: nd6_lookup: failed to add route for a neighbor(2001:0470:0007:0028::0001), errno=17
> 
> With your exact configuration between two 7.0 boxes, I see no indication 
> of this error whatsoever, with the /128 prefix.
>
	Possibly because of :

http://lists.freebsd.org/pipermail/freebsd-net/2006-May/010718.html
http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/93220

	which wouldn't apply to me due to my version.
> 
> > 	The tunnel came up, was passing traffic, but those messages were
> > getting out of hand. I tried a prefixlen of 64, and I got:
> > 
> > 	ifconfig: ioctl (SIOCAIFADDR): Invalid argument
> 
> When I attempted to recreate the tunnel with any prefix length other 
> than 128, the same ifconfig error appeared as above. It appears as 
> though when creating a gif tunnel, the only IPv6 prefix length that is 
> valid as far as ifconfig is concerned is /128 even though the link's 
> prefix is /64 even in 7.
> 
	It seems if I just did :

ifconfig gif0 inet6 2001:470:7:28::2/64

	instead of :

ifconfig gif0 inet6 2001:470:7:28::2 2001:470:7:28::1 prefixlen 128

	It "got happy". I haven't seen any of the messages yet, and
so far no issues I can readily see. 

			Tuc