Re: 6to4 tunnel trouble
Hi
On Sat, Dec 06, 2008 at 08:57:12PM +0000, Mike Crowe wrote:
> I'm using 6to4 with my static IPv4 address. Some sites
> (e.g. ipv6.google.com, www.debian-administration.org,
> ipv6.beijing2008.cn, other 6to4 hosts) seem to be working
> fine. Unfortunately others don't seem to be working at all
> (www.kame.net, ipv6.research.microsoft.com,
> altavista.ipv6.digital.com.)
6to4 does not get routed symetrically. When I was using 6to4 I was
seeing exactly the same as you are, after looking at it for a while I
concluded that the hosts you can't reach don't have a route back to to
the IPv4 network. At some point a host/router has to recoginse it's a
6to4 address and send it to the correct IPv4 host instead of following
the normal IPv6 routing (most likely the default IPv6 gateway). While
there is an IPv4 multicast address for 6to4 gateways I don't think
there's an equivalent on the IPv6 side (I could be wrong here) so it's
possible to build a network segment that won't know where to send 6to4
addresses too.
> Is this likely to be due to some problem at my end or the 6to4 relay
> I'm using? Here's a traceroute6:
So the short summary is that it's not your fault (as far as I
understand it - I could be wrong).
But as I said, I had exactly the same problems are you have. After
switching to a tunnel broker instead of using 6to4 (I have no
complaints about sixxs.net) everything worked perfectly and now I can
see the turtle dance!
Regards
Floris
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