6to4 status (again)

Keith Moore moore at network-heretics.com
Tue Feb 26 07:07:07 CET 2013

On 02/25/2013 10:44 PM, Lorenzo Colitti wrote:
> On Tue, Feb 26, 2013 at 11:20 AM, Jared Mauch <jared at puck.nether.net 
> <mailto:jared at puck.nether.net>> wrote:
>     I would say if you're going to run the service, run it
>     high-quality.  It may not need you to drop in a 10GE, but to put
>     in more regional 6to4 gateways.
>     Otherwise, disconnect it and don't look back.  So many people have
>     access to native these days, or provider-based IPv6+IPv4
>     technologies, I don't see a lot of a reason to run a transition
>     technology any more.
> Yep.
> So Kevin turns off his relay, and 900Mbps of traffic sloshes over to 
> some other relays. Those relays see a sudden increase in traffic, and 
> some of them might get overloaded. The operators of the ones that are 
> overloaded will ask themselves the same question, and some of them 
> might get the same answer. If they get the same answer, then repeat. 
> At the end, 6to4 basically doesn't work at all.
The problem is that the advice is based on a false premise.  Native 
access is NOT yet widely available in many parts of the world.   If it 
were, there wouldn't be much 6to4 traffic, and turning off 6to4 relays 
wouldn't cause problems.

So a recommendation to drop 6to4 relays would, at the present time, be a 
very harmful recommendation.


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