HP 6125XLG Layer 3-Ip Services Configuration Manual page 212

physical interface of the tunnel. In the IPv4 header, the source IPv4 address is the IPv4 address of
the tunnel source, and the destination IPv4 address is the IPv4 address of the tunnel destination.
3. Upon receiving the packet, Device B de-encapsulates the packet.
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
Automatic tunnel
• 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.
Tunnel source/destination
Tunnel mode
address
The source and destination IPv4
IPv6 over IPv4
addresses are manually
manual tunneling
configured.
The source IPv4 address is
manually configured. The
6to4 tunneling
destination IPv4 address is
automatically obtained.
The source IPv4 address is
manually configured. The
ISATAP tunneling
destination IPv4 address is
automatically obtained.
201
Destination IPv6 address
format
Ordinary IPv6 address
6to4 address, in the format of
2002:IPv4-destination-address::/
48, where the
IPv4-destination-address is the
IPv4 address of the tunnel
destination.
ISATAP address, in the format of
Prefix:0:5EFE:IPv4-destination-ad
dress/64 where the
IPv4-destination-address is the
IPv4 address of the tunnel
destination.