HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Services Configuration G - Page 166

Tunnel modes, Destination IPv6 address

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4. If the destination address of the IPv6 packet is itself, Device B forwards it to the upper-layer protocol. If not, Device B forwards it according to the routing table. Tunnel modes IPv6 over IPv4 tunnels include manually configured tunnels and automatic tunnels, depending on how the IPv4 address of the tunnel destination is acquired. • Manually configured tunnel-The destination IPv4 address of the tunnel cannot be automatically acquired from the destination IPv6 address of an IPv6 packet at the tunnel source, and must be manually configured. • Automatic tunnel-The destination IPv4 address of the tunnel can be automatically acquired from the destination IPv6 address (with an IPv4 address embedded) of an IPv6 packet at the tunnel source. According to the way an IPv6 packet is encapsulated, IPv6 over IPv4 tunnels are divided into the following modes. Table 10 IPv6 over IPv4 tunnel modes and key parameters Tunnel type Manually configured tunnel Tunnel mode IPv6 over IPv4 manual tunneling Tunnel source/destination address The source and destination IPv4 addresses are manually configured. Destination IPv6 address format Ordinary IPv6 address. 6to4 tunneling Automatic tunnel ISATAP tunneling The source IPv4 address is manually configured. The destination IPv4 address is automatically obtained. 6to4 address, in the format of 2002:IPv4-destination-addres s::/48, where the IPv4-destination-address is the IPv4 address of the tunnel destination. The source IPv4 address is manually configured. The destination IPv4 address is automatically obtained. ISATAP address, in the format of Prefix:0:5EFE:IPv4-destinatio n-address/64 where the IPv4-destination-address is the IPv4 address of the tunnel destination. • IPv6 over IPv4 manual tunneling-A point-to-point link and its source and destination IPv4 addresses are manually configured. You can establish an IPv6 over IPv4 manual tunnel to connect isolated IPv6 networks over an IPv4 network, or connect an IPv6 network to an IPv4/IPv6 dual-stack host over an IPv4 network. • 6to4 tunneling-A point-to-multipoint automatic tunnel. It is used to connect multiple isolated IPv6 networks over an IPv4 network. The destination IPv4 address of a 6to4 tunnel is embedded in the destination 6to4 address of packets. This mechanism enables the device to automatically get the tunnel destination address, simplifying tunnel establishment. The 6to4 address format is 2002:abcd:efgh:subnet number::interface ID/48, where 2002 is the fixed IPv6 address prefix, and 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 158

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158
4.
If the destination address of the IPv6 packet is itself, Device B forwards it to the upper-layer
protocol. If not, Device B forwards it according to the routing table.
Tunnel modes
IPv6 over IPv4 tunnels include manually configured tunnels and automatic tunnels, depending on how
the IPv4 address of the tunnel destination is acquired.
Manually configured tunnel
—The destination IPv4 address of the tunnel cannot be automatically
acquired from the destination IPv6 address of an IPv6 packet at the tunnel source, and must be
manually configured.
Automatic tunnel
—The destination IPv4 address of the tunnel can be automatically acquired from
the destination IPv6 address (with an IPv4 address embedded) of an IPv6 packet at the tunnel
source.
According to the way an IPv6 packet is encapsulated, IPv6 over IPv4 tunnels are divided into the
following modes.
Table 10
IPv6 over IPv4 tunnel modes and key parameters
Tunnel type
Tunnel mode
Tunnel source/destination
address
Destination IPv6 address
format
Manually
configured tunnel
IPv6 over IPv4 manual
tunneling
The source and destination
IPv4 addresses are manually
configured.
Ordinary IPv6 address.
Automatic tunnel
6to4 tunneling
The source IPv4 address is
manually configured. The
destination IPv4 address is
automatically obtained.
6to4 address, in the format of
2002:IPv4-destination-addres
s::/48, where the
IPv4-destination-address is the
IPv4 address of the tunnel
destination.
ISATAP tunneling
The source IPv4 address is
manually configured. The
destination IPv4 address is
automatically obtained.
ISATAP address, in the format
of
Prefix:0:5EFE:IPv4-destinatio
n-address/64 where the
IPv4-destination-address is the
IPv4 address of the tunnel
destination.
IPv6 over IPv4 manual tunneling
—A point-to-point link and its source and destination IPv4
addresses are manually configured. You can establish an IPv6 over IPv4 manual tunnel to connect
isolated IPv6 networks over an IPv4 network, or connect an IPv6 network to an IPv4/IPv6 dual-stack
host over an IPv4 network.
6to4 tunneling
—A point-to-multipoint automatic tunnel. It is used to connect multiple isolated IPv6
networks over an IPv4 network. The destination IPv4 address of a 6to4 tunnel is embedded in the
destination 6to4 address of packets. This mechanism enables the device to automatically get the
tunnel destination address, simplifying tunnel establishment.
The 6to4 address format is 2002:abcd:efgh:subnet number::interface ID/48, where 2002 is the
fixed IPv6 address prefix, and 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