HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Services Conf - Page 131

IPv6 over IPv6 tunneling, Principle of IPv4 over IPv6 tunneling

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Figure 62 Principle of IPv4 over IPv6 tunneling The encapsulation and de-encapsulation processes illustrated in Figure 62 are described as follows: • Encapsulation a. Upon receiving a packet from the attached IPv4 network, Device A examines the destination address of the packet and determines the outgoing interface. b. If the packet is destined for the IPv4 network attached to Device B, Device A delivers the packet to the tunnel interface pointed to Device B. c. The tunnel interface adds an IPv6 header to the original IPv4 packet and delivers the packet to the IPv6 protocol stack for forwarding. • De-encapsulation a. Upon receiving a packet from the attached IPv6 network, Device B delivers the packet to the IPv6 protocol stack to examine the protocol type encapsulated in the data portion of the packet. b. If the protocol type is IPv4, the IPv6 protocol stack delivers the packet to the tunneling module. c. The tunneling module removes the IPv6 header and delivers the remaining IPv4 packet to the IPv4 protocol stack for subsequent forwarding. IPv6 over IPv6 tunneling IPv6 over IPv6 tunneling (specified in RFC 2473) is developed for IPv6 data packet encapsulation so that encapsulated packets can be transmitted over an IPv6 network. The encapsulated packets are IPv6 tunnel packets. Figure 63 Principle of IPv6 over IPv6 tunneling 123

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123
Figure 62
Principle of IPv4 over IPv6 tunneling
The encapsulation and de-encapsulation processes illustrated in
Figure 62
are described as follows:
•
Encapsulation
a.
Upon receiving a packet from the attached IPv4 network, Device A examines the destination
address of the packet and determines the outgoing interface.
b.
If the packet is destined for the IPv4 network attached to Device B, Device A delivers the packet
to the tunnel interface pointed to Device B.
c.
The tunnel interface adds an IPv6 header to the original IPv4 packet and delivers the packet to
the IPv6 protocol stack for forwarding.
•
De-encapsulation
a.
Upon receiving a packet from the attached IPv6 network, Device B delivers the packet to the
IPv6 protocol stack to examine the protocol type encapsulated in the data portion of the
packet.
b.
If the protocol type is IPv4, the IPv6 protocol stack delivers the packet to the tunneling module.
c.
The tunneling module removes the IPv6 header and delivers the remaining IPv4 packet to the
IPv4 protocol stack for subsequent forwarding.
IPv6 over IPv6 tunneling
IPv6 over IPv6 tunneling (specified in RFC 2473) is developed for IPv6 data packet encapsulation so that
encapsulated packets can be transmitted over an IPv6 network. The encapsulated packets are IPv6
tunnel packets.
Figure 63
Principle of IPv6 over IPv6 tunneling