[afripv6-discuss] Introduction to 6to4

[JORDI PALET MARTINEZ]

Hi Graham,

That's the idea, I'm preparing a series of follow on emails showing how to
do that with Cisco, Linux, BSD, Huawei, Windows, etc.

Stay tunned next days :-)

Regards,
Jordi




> De: Graham Beneke <graham_bulk at apolix.co.za>
> Responder a: <graham_bulk at apolix.co.za>
> Fecha: Wed, 06 Jun 2007 21:29:29 +0200
> Para: <jordi.palet at consulintel.es>, "IPv6 in Africa
> <afripv6-discuss at afrinic.net>" <afripv6-discuss at afrinic.net>
> Asunto: Re: [afripv6-discuss] Introduction to 6to4
> 
> Hi Jordi
> 
> Thanks for this very good overview.
> 
> I have been doing a number of test deployments of 6to4 and it seems to
> be fairly easy to get running.
> 
> I have been trying to find out about setting up 6to4 relay routers as
> all the ones that are currently announced globally are at least an ocean
> away from us. Can you provide information about how to go about this?
> 
> 
> JORDI PALET MARTINEZ wrote:
>> 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
> 
> 
> -- 
> 
>   Graham Beneke
>   Apolix Internet Services
> 
> E-Mail/MSN/Jabber: graham at apolix.co.za <mailto:graham at apolix.co.za>
> Cell: 082-432-1873 <callto://+27824321873>
> Skype: grbeneke <callto://grbeneke>
> WEB: www.apolix.co.za <http://www.apolix.co.za/>
> 




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