HPE FlexNetwork 10500 Series Configuration Manual page 252

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Automatic tunnel—The destination IPv4 address of the tunnel can be automatically obtained
from the destination IPv6 address (with an IPv4 address embedded) of an IPv6 packet at the
tunnel source.
The source IPv4 addresses for all IPv6 over IPv4 tunnels are manually configured.
According to the way an IPv6 packet is encapsulated, IPv6 over IPv4 tunnels are divided into the
modes shown in the following table:
Table 11 Automatic tunnel modes and key parameters
Tunnel mode
Manually configured tunnel
IPv6 over IPv4 manual tunneling
Automatic tunnel
6to4 tunneling
ISATAP tunneling
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IPv6 over IPv4 manual tunneling—A point-to-point link. This type of tunneling provides the
following solutions:
Connects isolated IPv6 networks over an IPv4 network.
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Connects an IPv6 network and an IPv4/IPv6 dual-stack host over an IPv4 network.
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6to4 tunneling
Ordinary 6to4 tunneling—A point-to-multipoint automatic tunnel. It is used to connect
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multiple isolated IPv6 networks over an IPv4 network.
6to4 relay—Connects a 6to4 network and an IPv6 network that uses an IP prefix other than
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2002::/16. A 6to4 relay router is a gateway that forwards packets from a 6to4 network to an
IPv6 network.
As shown in
6to4 tunnel. Configure a static route on the border router (Device A) in the 6to4 network.
The next hop address must be the 6to4 address of the 6to4 relay router (Device C). Device
Destination IPv6 address format
Ordinary IPv6 address.
6to4 address. The address format is 2002:abcd:efgh:subnet
number::interface ID/48.
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NOTE:
The destination IPv4 address of a 6to4 tunnel is embedded in
the destination 6to4 address. This mechanism enables the
device to automatically obtain the tunnel destination address.
ISATAP address. The address format is
prefix:0:5EFE:abcd:efgh/64.
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Figure 88, 6to4 network Site 1 communicates with IPv6 network Site 3 over a
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2002 is the fixed IPv6 address prefix.
abcd:efgh represents a 32-bit globally unique IPv4
address in hexadecimal notation.
For example, 1.1.1.1 can be represented by 0101:0101.
The IPv4 address identifies a 6to4 network (an IPv6
network where all hosts use 6to4 addresses). The border
router of a 6to4 network must have the IPv4 address
abcd:efgh configured on the interface connected to the
IPv4 network.
The subnet number identifies a subnet in the 6to4
network.
The subnet number::interface ID uniquely identifies a
host in the 6to4 network.
The 64-bit prefix is a valid IPv6 unicast address prefix.
The abcd:efgh/64 segments represent a 32-bit IPv4
address, which identifies the tunnel destination but does
not require global uniqueness.