host
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...
The basic mechanism described in the present document, which applies
to sites rather than individual hosts, will scale indefinitely by
limiting the number of sites served by a given relay router (see
...
... Although the mechanism is specified for an IPv6 site, it can equally
be applied to an individual IPv6 host or very small site, as long as
it has at least one globally unique IPv4 address. However, the
...
... method is to allow isolated IPv6 sites or
hosts, attached to a wide area network which has no native IPv6
support, to communicate with other such IPv6 ...
... IPv6
support, to communicate with other such IPv6 domains or hosts with
minimal manual configuration.
...
... The 6to4 mechanism is typically implemented almost entirely in border
routers, without specific host modifications except a suggested
address selection default. Only a modest amount of router ...
... routing aspects, for 6to4 sites. Scenarios for isolated 6to4 hosts
are not discussed in this document. Sections 6 to 9 discuss other
general considerations.
...
... 6to4 host:
an IPv6 host which happens to have at least one 6to4 address.
In all other respects it is a standard IPv6 host ...
... 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 ...
... configured tunnel. Such a node may function as an IPv6 host using a
6to4 address on its configured tunnel ...
... destination address selection must be appropriately implemented.
If the source IPv6 host sending a packet has at least one 2002::
address assigned to it, and if the set of IPv6 addresses ...
... IPv6 addresses returned by
the DNS for the destination host contains at least one 2002::
address, then the source host ...
... destination host contains at least one 2002::
address, then the source host must make an appropriate choice of the
source and destination addresses to be used. The mechanisms for
...
... IPv6 host on site B queries the DNS entry for a host on site
A, or otherwise obtains its address, it obtains an address ...
... queries the DNS for a host on site B. IPv6 packets are formed and
transmitted in the normal way within both sites.
...
... route will
be used depends on IPv6 address selection by the individual hosts (or
even applications).
...
...
Now consider again the example of the previous section. Suppose an
IPv6 host on site B queries the DNS entry for a host ...
... IPv6 host on site B queries the DNS entry for a host on site A, and
the DNS returns multiple IPv6 addresses ...
... ______________| |_________________________________|
If the host picks the 6to4 prefix according to some rule for multiple
...
... host behind the NAT can
become an IPv6 host with no need for additional address space
allocation, and no intervention by the Internet service provider ...
...
A more complex situation arises if a host is more than one NAT hop
away from the globally unique IPv4 address ...
... outermost NAT has a unique IPv4 address. All IPv6 hosts in this
situation must use addresses derived from the 2002: prefix ...
... border router is combined with an RSIP border
router, it can support IPv6 hosts using 6to4 addresses, IPv4 hosts
...
... border
router, it can support IPv6 hosts using 6to4 addresses, IPv4 hosts
using RSIP, or dual stack ...
... using RSIP, or dual stack hosts using both. The RSIP function
provides fine-grained management ...
... Gilligan, R. and E. Nordmark, "Transition Mechanisms for IPv6 Hosts and Routers", RFC 2893(-> 4213prop), August 2000. ...