Figure 1 6To4 Address Format; Figure 2 Automatic 6To4 Tunnel - Zte ZXR10 5900E Series User Manual

ZXR10 5900E Series User Manual (IPv6 Volume)
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An IPv6 manually configured tunnel is a point to point tunnel.
While an automatic 6to4 tunnel is a point to multi-point tunnel. In
an automatic 6to4 tunnel, an IPv4 network is looked as a virtual
NBMA network. Therefore, routers are not configured in couples.
The other end of the tunnel can be found through an IPv4 address
in which an IPv6 address is embedded in.
IPv6 address prefix of edge router begins with 2002::/16. Its for-
mat is shown in Figure
address for short.
F 1 6TO4 ADDRESS FORMAT
IGURE
The IPv4 address in
address should be configured on the interface of edge router that
connects with IPv4 network.
Working flow of an automatic 6to4 tunnel is described as follows:
F 2 AUTOMATIC 6TO4 TUNNEL
IGURE
As shown in Figure 2, R1 and R2 are at two sides of a 6to4 tunnel.
6to4 addresses are configured on fei_1/2 of R1 and all hosts in site
1. Configure an IPv4 address on fei_1/1 of R1. Embed this IPv4
address in 6to4 addresses.
6to4 addresses are also configured on fei_1/2 of R2 and all hosts
in site 2. Configure an IPv4 address on fei_1/2 of R2. Embed this
IPv4 address in 6to4 addresses.
When a host in site 1 visits a host in site 2, a message is transmit-
ted to R1. R1 views the destination of this message and finds that
it is a 6to4 address. R1 obtains IPv4 address at the other side of
the tunnel from this 6to4 address. So R1 encapsulates this IPv6
message in an IPv4 message. The destination address of this IPv4
message is the peer IPv4 address, that is, the address on fei_1/1
of R2. The source address of this IPv4 message is the address on
fei_1/1 of R1. The message is transmitted to R2. R2 dis-encap-
sulates this message and sends the IPv6 message to destination
host.
1. This kind of IPv6 address is called 6to4
Figure 1 should be globally unique. This IPv4