Comcast enables 6to4 relays
marka at isc.org
Tue Aug 31 17:13:57 CDT 2010
In message <20100831062203.be89ed60 at mail.wardenm.net>, "Mitchell Warden" writes
> > The list seems to be showing relays that announce both the IPv4 and the
> > IPv6 anycast prefixes.
> > I have noticed a number of deployments that announce the (in)famous IPv4
> > prefix and then consider their deployment complete. I suspect that there
> > is a lack of 2002::/16 announcements and this would be contributing to
> > the regular problems with return paths.
> > Obviously the IPv6 content networks benefit the most from having a relay
> > translating back to IPv4.
> > Anyone have experience with this?
> > --
> > Graham Beneke
> Is there a reason not to advertise more specific prefixes from 2002::/16
> to ensure that traffic for your v4 routes comes back to your own 6to4
> If for example all my users have v4 addresses in 192.0.2.0/24, I could
> advertise 2002:C002:0000::/40 instead of or in addition to the full
Which would end up with the entire set of IPv4 routes in IPv6. This is
not a good idea. Just do you part and encapuslate/decapsulate as
soon as possible and let the other end do the same.
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: marka at isc.org
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