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hjazz
join:2008-12-23
| 6to4 router vs 6to4 relay router
Hi,
I'm a bit confused about the difference between a 6to4 router and a 6to4 relay router.
I understand that a 6to4 routers are used between 6to4 sites, while 6to4 relay routers are used between native IPv6 sites and 6to4 sites. However, what exactly is a 6to4 site and a native IPv6 site? Don't both type of routers forward IPv6 packets over IPv4 networks, which means both routers work in a IPv6 network? Or does the difference only lies in the IP addresses used, i.e. 6to4 routers accept only 6to4 source and destination addresses (2002::/16 prefixes) and 6to4 relay routers accept only 6to4 source/native IPv6 dest (2001::/16 prefixes) addresses and native IPv6 source/6to4 dest addresses? If that's the case, why have the distinction? Why not just use 6to4 routers?
Also, looking at the diagram in
»www.ipv6tf.org/index.php?page=us···ity/6to4
what is a IPv6 island? Is it a private IPv6 network setup by say, organizations and schools?
Thank you.
Regards,
Rayne | |
Datlev
Premium
join:2002-02-15
Ashburn, VA
 ·Vonage
 ·Verizon FIOS
| Probably the most complete reference is the RFC's at this point. Here is a snippet from RFC 3056: (»tools.ietf.org/html/rfc3056)
Also take a look at RFC 3068: (»tools.ietf.org/html/rfc3068)
1.1. Terminology
The terminology of [IPV6] applies to this document.
6to4 pseudo-interface:
6to4 encapsulation of IPv6 packets inside IPv4 packets occurs
at a point that is logically equivalent to an IPv6 interface,
with the link layer being the IPv4 unicast network. This point
is referred to as a pseudo-interface. Some implementors may
treat it exactly like any other interface and others may treat
it like a tunnel end-point.
6to4 prefix:
an IPv6 prefix constructed according to the rule in Section 2
below.
6to4 address: an IPv6 address constructed using a 6to4 prefix.
Native IPv6 address: an IPv6 address constructed using another type
of prefix than 6to4.
6to4 router (or 6to4 border 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.
6to4 host:
an IPv6 host which happens to have at least one 6to4 address.
In all other respects it is a standard IPv6 host.
Note: an IPv6 node may in some cases use a 6to4 address for a
configured tunnel. Such a node may function as an IPv6 host using a
6to4 address on its configured tunnel interface, and it may also
serve as a IPv6 router for other hosts via a 6to4 pseudo-interface,
but these are distinct functions.
6to4 site:
a site running IPv6 internally using 6to4 addresses, therefore
containing at least one 6to4 host and at least one 6to4 router.
Relay router:
a 6to4 router configured to support transit routing between
6to4 addresses and native IPv6 addresses.
6to4 exterior routing domain:
a routing domain interconnecting a set of 6to4 routers and
relay routers. It is distinct from an IPv6 site's interior
routing domain, and distinct from all native IPv6 exterior
routing domains. | |
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