Re: Correct method for IPv6 over IPv4 tunneling

[Ignatios Souvatzis <presse%ycm-bonn.de@localhost>]

On Wed, May 16, 2012 at 09:34:11PM +1000, Darren Reed wrote:
> On 16/05/2012 9:15 PM, Hubert Feyrer wrote:
> > On Wed, 16 May 2012, Darren Reed wrote:
> >> netbsd ~# ifconfig gif0 create
> >> netbsd ~# ifconfig gif0 inet6 2001::1 2001::2 prefixlen 126
> >> ifconfig: SIOCAIFADDR_IN6: Invalid argument
> > ...
> >> Is my NetBSD foo wrong or...?
> >>
> > 
> > Maybe you need something like
> > 
> >     ifconfig gif0 tunnel a.a.a.a. b.b.b.b
> > 
> > between those two lines? See here for a working example (no more in 
> > operation):
> > 
> >     http://www.feyrer.de/IPv6/netstart.local
> 
> The problem was I was missing "prefixlen 128".
> I had tried other prefix lengths but to no avail.
> 
> Without that, it is not possible to configure an IPv6 over IPv4
> gif tunnel.

Hm.  Let me check my @work tunnel startup scripts.

create
tunnel labIV-gw-outer labIV-gw-outer-remote
inet6 fe80::1/64 up
!/sbin/route add -inet6 2001:db8:0042:5040:: fe80::2%$int -prefixlen 60

Hm...

I think (but didn't look at the source) you'd need prefixlen 128 for 
point to point addresses, and get a network otherwise.

Regards,
        -is
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