- Fact:
- In the beginning: there
was no
IPv6 networks
- Then a few institutes
(pioneers implements
and deploys the
IPv6 network software:
- During the
initial deployment,
the IPv6 networks were
connected with
IPv4-tunnels:
- In the beginning: there
was no
IPv6 networks
- In other words:
- Tunneling encapsulates
IPv6 packets
within IPv4 packets so:
- IPv6 packets can be sent over an IPv4 network, allowing isolated IPv6 networks to communicate without the need to upgrade the IPv4 routers that between them.
- Tunneling encapsulates
IPv6 packets
within IPv4 packets so:
- Packet format used in
IPv6 in IPv4 encapsulation:
- Tunnel setup:
Note:
- The edge routers must have
a dual stack, running:
- IPv4 and
- IPv6
routing software
- The IPv6 implementation contains the IPv4 encapsulation software to deploy over IPv4 !!!
- The edge routers must have
a dual stack, running:
- How an
IPv6 packet will be
transmitted:
- Host AA:::::4 transmit
an IPv6 message to
BB:::::9:
- The virtual interface entry
and the IPv6 encapsulation software
will cause the
IPv6 packet to be
encapsulated in an
IPv4 packet:
The IPv4 packet will use the packet code 41 to indicate it is a IPv6 encapsulation
- The encapsulated IPv4 packet will
be sent to
the router 4.4.4.1:
- When the
encapsulated IP packet
arrives at 4.4.4.1, the
router detects
its own IP address and
de-encapsulate
The router will process the inner packet an an IPv6 packet because the outer code = 41
- The IPv6 packet is
forwarded further
by the IPv6 routing software in
the router:
- Host AA:::::4 transmit
an IPv6 message to
BB:::::9:
- 6bone:
- 6bone =
the tunneled network consisting of
the IPv6 networks
Wikipedia: click here
- 6bone =
the tunneled network consisting of
the IPv6 networks
- Nowadays:
- Every router
(and networked computer) runs
dual stack
(Has both IPv4 and IPv6 software)
- IPv6 is now the standard
- Most
network services
(such as Google, Yahoo, ...) provide
access on
both
IPv4 and
IPv6 networks
Mainly because:
- Most computers in the
USA still runs
IPv4 software in 2016
(That can change soon).
- Most computers in the
USA still runs
IPv4 software in 2016
- Every router
(and networked computer) runs
dual stack