nd6_lookup prints bogus messages with point to point devices

[Ed Schouten]

Hello Bruce,

* Bruce A. Mah <bmah at freebsd.org> wrote:
> I think that suz@ and ume@ are the people who have worked in this area
> most recently, hopefully one of them will speak up.  You didn't give a
> lot of details...please give (at a minimum) the version of FreeBSD
> you're using and more details about the interface over which you're
> having this problem.
> 
> I saw this on RELENG_6 sometime after some IPv6 ND changes that were
> merged in late last year.  I have a gif(4) tunnel to my ISP over which I
> do IPv6.  The GIF tunnel was originally configured as a point-to-point
> interface and I got the same messages you mentioned.  My workaround was
> to configure the gif(4) interface as a /127, which was obviously only
> possible because the two interface addresses on each end of the tunnel
> just happened to differ only in their least-significant bits.  (I know
> this isn't the right solution.)

I'm seeing the messages on the machine in Eindhoven (running RELENG_6
from a few days/weeks ago), but they also show up on my HEAD machine at
home. Below is the output of `ifconfig gif0` on my machine at home:

| gif0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1280
|         tunnel inet 83.181.147.170 --> 193.109.122.244
|         inet6 fe80::202:a5ff:fe58:4927%gif0 prefixlen 64 scopeid 0x7 
|         inet6 2001:7b8:310::1 --> 2001:7b8:2ff:a4::1 prefixlen 128 

As far as I know, the latest FreeBSD releases show an error message when
assigning an address with a non-128 prefixlen.

-- 
 Ed Schouten <ed at fxq.nl>
 WWW: http://g-rave.nl/
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