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From: Nikos Vassiliadis <nvass@teledomenet.gr>
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Date: Tue, 20 Mar 2007 17:16:30 +0200
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Cc: Eric F Crist <mnslinky@gmail.com>
Subject: Re: IPv6 Tunnel issues...
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On Tuesday 20 March 2007 17:01, Eric F Crist wrote:
> On 3/20/07, Eric F Crist <mnslinky@gmail.com> wrote:
> >
> > My ISP tells me it should be prefixlen 126, not 128
> >
> > On 3/20/07, Björn König <bjoern.koenig@alpha-tierchen.de > wrote:
> > >
> > > Eric F Crist schrieb:
> > > > [...] I'm performing the configuration as follows:
> > > >
> > > > ifconfig gif0 create
> > > > ifconfig gif0 tunnel <my IPv4 address> <my ISP IPv4 address>
> > > > ifconfig gif0 inet6 alias aaaa:aaaa:a::a bbbb:bbbb:b::b prefixlen 126
> > > >
> > > > When I execute the last command, I get:
> > > > ifconfig: ioctl (SIOCAIFADDR): Invalid argument
> > > >
> > > > [...]
> > >
> > > Use a prefix length of 128 instead of 126.
> > >
> > > Regards
> > > Björn
> >
> >
> Sorry for the top post earlier.  I've eliminated the second IP address on
> the inet6 ifconfig command, and prefixlen 126 is accepted.  Now I just get
> no ping replies accross the gif0 interface.  ifconfig shows all the correct
> information, and netstat -rn shows valid routes.  What am I missing?  I
> *did* have this working at one time this morning, but I tried to get things
> into rc.conf and haven't been able to get it back up.

There is an errata notice about gif(4)s,
don't know it affects you...

http://www.freebsd.org/releases/6.2R/errata.html