[afripv6-discuss] Introduction to 6to4

[Alex Corenthin]

Thanks Jordi for this information
Alex


2007/6/6, JORDI PALET MARTINEZ <jordi.palet at consulintel.es>:
>
> Hi all,
>
> This is the first email, as indicated a few days ago and in the last
> AfriNIC
> meeting, in order to show 6to4 and Teredo, a couple of very interesting
> transition mechanisms, that automatically setup IPv6 connectivity for
> hosts
> and consequently allow IPv6 traffic even if the ISPs don't support it.
>
> Remember that users with Operating Systems supporting IPv6 (most of them
> today, some enabled by default), will start using automatic transition
> mechanisms (such as 6to4 and Teredo) and there will be more and more IPv6
> "transition" traffic in your networks even if you don't deploy IPv6. See
> the
> presentation "The cost of NOT deploying IPv6", which become more relevant
> in
> developing regions where the upstream bandwidth is much more expensive and
> some times slower because using satellites. The latest set of slides on
> this
> topic are available at:
>
> http://www.ripe.net/ripe/meetings/ripe-54/presentations/cost_not_deploying_I
> Pv6.pdf
>
> The purpose of the complete set of emails is to show how to take
> advantage,
> with almost no cost, of deploying 6to4 and Teredo relays in your networks,
> in order to a) be able to save some bandwidth (traffic will stay in your
> network or peers instead of traversing long paths looking for third party
> relays), b) deliver a much better non-managed IPv6 "quality of service" to
> your users (lower RTT).
>
> Please, feel free to make any questions that you have by replying to each
> email.
>
> As there will be several emails for each protocol, I will suggest that you
> restrict the questions to the contents of each email and keep the same
> subject, so people that later on join the topic, can follow easily the
> email
> archive and we avoid answering the same question several times.
>
> For general information about IPv6, please take a look to the training
> material at:
> http://www.afrinic.net/training/ipv6training.htm
>
> Regards,
> Jordi
>
>
>
> Introduction to 6to4
> =====================
>
> 6to4 is a transition mechanism that allows IPv6 to be encapsulated in IPv4
> packets (using protocol 41), in order to traverse IPv4-only networks and
> for
> example, allow transit of IPv6 thru ISPs that only offer IPv4 service.
>
> In principle, it requires a public IPv4 address.
>
> According to RFC3056 there are two ways a router could support the 6to4
> transition mechanism.
>
> The first is called 6to4 Router and the second 6to4 Relay Router.
>
> 1) 6to4 Router: An IPv6 router supporting a 6to4 pseudo-interface. It is
> normally the border router between an IPv6 site and a wide-area IPv4
> network.
>
> For example, think in an isolated IPv6 cloud. This cloud could use 6to4
> addresses and get connected to other IPv6 nodes through the 6to4 router.
>
> 2) 6to4 Relay Router: A 6to4 router configured to support transit routing
> between 6to4 addresses and native IPv6 addresses.
>
> The main difference with the 6to4 Router is that the Relay router is
> connected to the native IPv6 world. Or what is the same, they announce the
> 2002::/16 prefix to their routing peers.
>
> Note that an isolated host could be configured as 6to4 router just to
> obtain IPv6 connectivity (this is called a 6to4 router/host). This
> configuration is automatic in many operating systems, and in practice, in
> means that when a host has IPv6 enabled and a public IPv4 address, if it
> supports 6to4, it will gain automatic access to IPv6 even if the ISP
> doesn't
> provide the service.
>
> The 6to4 addresses use the prefix 2002::/16
>
> For the automatic configuration of the 6to4 hosts in order to reach a 6to4
> relay, the 6to4 relays need to use an anycast address, which is
> 192.88.99.1.
> More info on this in RFC3068.
>
>
> More information and pictures are available at:
> http://www.ipv6tf.org/index.php?page=using/connectivity/6to4
>
>
>
>
>
>
>
> **********************************************
> The IPv6 Portal: http://www.ipv6tf.org
>
> Bye 6Bone. Hi, IPv6 !
> http://www.ipv6day.org
>
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>
>
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>



-- 
Alex Corenthin
ISOC Sénégal
BP 11542 Dakar-Peytavin - Senegal
Tel : +221 667 07 75
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