HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Services Conf - Page 128

Tunnel types, manually con d.

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2. After determining from the routing table that the packet needs to be forwarded through the tunnel, Device A encapsulates the IPv6 packet with an IPv4 header and forwards it through the physical interface of the tunnel. 3. Upon receiving the packet, Device B de-encapsulates the packet. 4. Device B forwards the packet according to the destination address in the de-encapsulated IPv6 packet. If the destination address is the device itself, Device B forwards the IPv6 packet to the upper-layer protocol for processing. Tunnel types Depending on how the IPv4 address of the tunnel destination is acquired, IPv6 over IPv4 tunnels are divided into the following types: • Manually configured tunnel-The destination address of the tunnel cannot be automatically acquired through the destination IPv6 address of an IPv6 packet at the tunnel source, and must be manually configured. • Automatic tunnel-The destination address of the tunnel is an IPv6 address with an IPv4 address embedded, and the IPv4 address can be automatically acquired through the destination IPv6 address of an IPv6 packet at the tunnel source. Table 9 IPv6 over IPv4 tunnel modes and key parameters Tunnel type Manually configured tunnel Tunnel mode IPv6 manual tunneling Tunnel source/destination address Tunnel interface address type The source/destination IP address is a manually configured IPv4 address. IPv6 address 6to4 tunneling Automatic tunnel Intra-site automatic tunnel addressing protocol (ISATAP) tunneling The source IP address is a manually configured IPv4 address. The destination IP address does not need to be configured. 6to4 address, in the format of 2002:IPv4-source-addr ess::/48 The source IP address is a manually configured IPv4 address. The destination IP address does not need to be configured. ISATAP address, in the format of Prefix:0:5EFE:IPv4-sour ce-address/64 According to the way an IPv6 packet is encapsulated, IPv6 over IPv4 tunnels are divided into the following modes: • IPv6 manual tunneling A manually configured tunnel is a point-to-point link. Each link is a separate tunnel. IPv6 manual tunnels are mainly used to provide stable connections for regular secure communication between border routers or between border routers and hosts for access to remote IPv6 networks. • 6to4 tunneling An automatic 6to4 tunnel is a point-to-multipoint tunnel mainly constructed between edge routers, and is used to connect multiple isolated IPv6 networks over an IPv4 network to remote IPv6 networks. The embedded IPv4 address in an IPv6 address is used to automatically acquire the destination IPv4 address of the tunnel. The automatic 6to4 tunnel adopts 6to4 addresses. The address format is 2002:abcd:efgh:subnet number::interface ID/64, where 2002 represents the fixed IPv6 address prefix, and abcd:efgh represents the 32-bit globally unique source IPv4 address of the 6to4 tunnel, in hexadecimal 120

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120
2.
After determining from the routing table that the packet needs to be forwarded through the tunnel,
Device A encapsulates the IPv6 packet with an IPv4 header and forwards it through the physical
interface of the tunnel.
3.
Upon receiving the packet, Device B de-encapsulates the packet.
4.
Device B forwards the packet according to the destination address in the de-encapsulated IPv6
packet. If the destination address is the device itself, Device B forwards the IPv6 packet to the
upper-layer protocol for processing.
Tunnel types
Depending on how the IPv4 address of the tunnel destination is acquired, IPv6 over IPv4 tunnels are
divided into the following types:
•
Manually configured tunnel
—The destination address of the tunnel cannot be automatically
acquired through the destination IPv6 address of an IPv6 packet at the tunnel source, and must be
manually configured.
•
Automatic tunnel
—The destination address of the tunnel is an IPv6 address with an IPv4 address
embedded, and the IPv4 address can be automatically acquired through the destination IPv6
address of an IPv6 packet at the tunnel source.
Table 9
IPv6 over IPv4 tunnel modes and key parameters
Tunnel type
Tunnel mode
Tunnel source/destination
address
Tunnel interface
address type
Manually
configured tunnel
IPv6 manual tunneling
The source/destination IP address is
a manually configured IPv4 address.
IPv6 address
Automatic tunnel
6to4 tunneling
The source IP address is a manually
configured IPv4 address. The
destination IP address does not need
to be configured.
6to4 address, in the
format of
2002:IPv4-source-addr
ess::/48
Intra-site automatic
tunnel addressing
protocol (ISATAP)
tunneling
The source IP address is a manually
configured IPv4 address. The
destination IP address does not need
to be configured.
ISATAP address, in the
format of
Prefix:0:5EFE:IPv4-sour
ce-address/64
According to the way an IPv6 packet is encapsulated, IPv6 over IPv4 tunnels are divided into the
following modes:
•
IPv6 manual tunneling
A manually configured tunnel is a point-to-point link. Each link is a separate tunnel. IPv6 manual
tunnels are mainly used to provide stable connections for regular secure communication between
border routers or between border routers and hosts for access to remote IPv6 networks.
•
6to4 tunneling
An automatic 6to4 tunnel is a point-to-multipoint tunnel mainly constructed between edge routers,
and is used to connect multiple isolated IPv6 networks over an IPv4 network to remote IPv6
networks. The embedded IPv4 address in an IPv6 address is used to automatically acquire the
destination IPv4 address of the tunnel.
The automatic 6to4 tunnel adopts 6to4 addresses. The address format is 2002:abcd:efgh:subnet
number::interface ID/64, where 2002 represents the fixed IPv6 address prefix, and abcd:efgh
represents the 32-bit globally unique source IPv4 address of the 6to4 tunnel, in hexadecimal