Pulling the Plug on 6to4

Following my earlier posts on using and prioritizing 6to4 in Windows 7 as well as the one describing the 6to4 anycast deployment, the time has come to take a different stance on things.

This post addresses network engineers as well as simple users and is trying to popularize and communicate that 6to4 is considered for good reason a harmful mechanism for the global proliferation of IPv6.

In no way I am going to invent the wheel. Simply have a look at the following measurements performed by Emile Aben (RIPE) and Geoff Huston (APNIC). By any means this is a disaster.

On top of various measurements, the experience accumulated during last years has clearly shown that the transition mechanism – once made to easy the migration to IPv6 are no longer capable of aiding us but rather pushing us back.

IETF has been very active in debating over pulling the plug on 6to4. As of the time of this post the following 2 fine examples of this effort are in place.  The draft-ietf-v6ops-6to4-to-historic-00 is the one that requires stopping all following development and implementations of 6to4. This is necessary to make sure OS and equipment vendors have 6to4 shut down by default. It has also an impact on some existing equipment certifications that have 6to4 a part of them as well.

We obviously can’t expect 6to4 to disappear overnight and here is draft-ietf-v6ops-6to4-advisory-00 that should serve as a good note on how to properly support existing 6to4 infrastructure to allow 6to4 to fade slowly without affecting user experience.

Here is a very useful link from getipv6.info. It describes the current customer problems that can generally occur with IPv6 and has some wording on 6to4 as well.

All in all, 6to4 is still a useful tool in some knowledgeable hands to make first steps into the IPv6 world. However the reality of IPv4 address exhaustion pushes content and service providers to take decisive steps. With CGNs things will get even worse.

If you are a simple user, an enterprise or a NOC and are looking for an easy way to disable 6to4 on Windows, here is a link to a patch from Microsoft that will heal the 6to4 troubles for you.


One thought on “Pulling the Plug on 6to4

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s