IPv6
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The growth of IPv6 networks started mainly using the transport
facilities offered by the current Internet ...
... facilities offered by the current Internet. This led to the
development of several techniques to manage IPv6 over IPv4 tunnels.
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... addresses [1]
is a simple mechanism to establish early IPv6 connectivity
among isolated dual-stack hosts ...
... IPv4. Also there is a great fear to
include the complete IPv4 routing table into the IPv6 world
because this would worsen the routing table size problem
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... link layer. It does not
solve the problem of connecting an isolated user to the global
IPv6 Internet;
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... domains,
attached to a wide area network with no native IPv6 support
(e.g., the IPv4 Internet), to communicate with other such IPv6 ...
... IPv6 support
(e.g., the IPv4 Internet), to communicate with other such IPv6
domains with minimal manual configuration ...
... automatically manage tunnel requests coming from the users. This
approach is expected to be useful to stimulate the growth of IPv6
interconnected hosts and to allow early IPv6 network ...
... IPv6
interconnected hosts and to allow early IPv6 network providers to
provide easy access to their IPv6 networks.
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... hosts and to allow early IPv6 network providers to
provide easy access to their IPv6 networks.
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... the Tunnel Broker fits well for small isolated IPv6 sites, and
especially isolated IPv6 hosts on the IPv4 Internet ...
... Tunnel Broker fits well for small isolated IPv6 sites, and
especially isolated IPv6 hosts on the IPv4 Internet, that want
to easily connect to an existing IPv6 network ...
... the 6to4 approach has been designed to allow isolated IPv6
sites to easily connect together without having to wait for
their IPv4 ...
...
Tunnel brokers can be seen as virtual IPv6 ISPs, providing IPv6
connectivity to users already connected to the IPv4 Internet ...
... Tunnel brokers can be seen as virtual IPv6 ISPs, providing IPv6
connectivity to users already connected to the IPv4 Internet. In the
emerging IPv6 Internet ...
... IPv6
connectivity to users already connected to the IPv4 Internet. In the
emerging IPv6 Internet it is expected that many tunnel brokers will
be available so that the user will just have to pick one. The list
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... of the tunnel brokers should be referenced on a "well known" web page
(e.g. on http://www.ipv6.org) to allow users to choose the "closest"
one, the "cheapest" one, or any other one.
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A TB must be IPv4 addressable. It may also be IPv6 addressable, but
this is not mandatory. Communications between the broker and the
servers can take place either with IPv4 ...
... this is not mandatory. Communications between the broker and the
servers can take place either with IPv4 or IPv6.
...
... service. With this respect the TB can be seen as an access-control
server for IPv4 interconnected IPv6 users.
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... registration in the DNS of the global
IPv6 address assigned to the client side of the tunnel;
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...
Moreover, if the client machine is an IPv6 router willing to provide
connectivity to several IPv6 hosts ...
... IPv6 router willing to provide
connectivity to several IPv6 hosts, the client should be asked also
to provide some information about the amount of IPv6 addresses ...
... IPv6 hosts, the client should be asked also
to provide some information about the amount of IPv6 addresses
required. This allows the TB to allocate the client an IPv6 prefix ...
... IPv6 addresses
required. This allows the TB to allocate the client an IPv6 prefix
that fits its needs instead of a single IPv6 address.
...
... it automatically registers in the DNS the global IPv6 addresses
assigned to the tunnel end-points ...
... After the above configuration steps have been carried out (including
the configuration of the client), the IPv6 over IPv4 tunnel between
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... allowing the tunnel broker user to get access to the 6bone or any
other IPv6 network the TS is connected to.
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... IPv6 address assignment ...
... IPv6 addresses assigned to both sides of each tunnel must be
global IPv6 addresses belonging to the IPv6 addressing space managed
by the TB.
...
... tunnel must be
global IPv6 addresses belonging to the IPv6 addressing space managed
by the TB.
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...
The lifetime of these IPv6 addresses should be relatively long and
potentially longer than the lifetime of the IPv4 ...
... connection of the
user. This is to allow the client to get semipermanent IPv6
addresses and associated DNS names even though it is connected to the
Internet ...
... management may be achieved by
having the TS periodically deliver to the TB IPv6 traffic and
reachability ...
... tunnel using the new IPv4
address of the client but reusing the previously allocated IPv6
addresses. That way, the client could preserve a nearly permanent
(static) IPv6 address ...
... IPv6
addresses. That way, the client could preserve a nearly permanent
(static) IPv6 address even though its IPv4 address is dynamic. It
could also preserve the associated DNS name ...
... Moreover, the idea of deploying a dedicated access-control server,
like the TB, to securely authorize and assist users that want to gain
access to an IPv6 network might prove useful also to enhance other
transition mechanisms. For example it would be possible to exploit a
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... TS keeps
tunneling the IPv6 traffic addressed to that user to his old IPv4
address regardless of the fact that in the meanwhile that IPv4
address ...
... tunnel the keep-alive mechanism outlined in section 2.5 thus
allowing the TB to immediately stop IPv6 traffic forwarding towards
disconnected users.
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... Gilligan, R. and E. Nordmark, "Transition Mechanisms for IPv6 Hosts and Routers", RFC 1933(-> 2893(-> 4213prop)), April 1996. ...