Ipv6 Over Ipv6 Tunneling; Overview; Configuring An Ipv6 Over Ipv6 Tunnel - HPE FlexNetwork 10500 Series Configuration Manual

IPv6 over IPv6 tunneling

Overview

IPv6 over IPv6 tunneling (RFC 2473) enables isolated IPv6 networks to communicate with each
other over another IPv6 network. For example, two isolated IPv6 networks that do not want to show
their addresses to the Internet can use an IPv6 over IPv6 tunnel to communicate with each other.
Figure 98 Principle of IPv6 over IPv6 tunneling
IPv6 header
IPv6
network A
IPv6 host
Figure 98 shows the encapsulation and de-encapsulation processes.
•
Encapsulation:
a. After receiving an IPv6 packet, Device A submits it to the IPv6 protocol stack.
b. The IPv6 protocol stack uses the destination IPv6 address of the packet to find the egress
interface. If the egress interface is the tunnel interface, the stack delivers it to the tunnel
interface.
c. After receiving the packet, the tunnel interface adds an IPv6 header to it and submits it to
the IPv6 protocol stack.
d. The IPv6 protocol stack forwards the packet according to its destination IPv6 address.
•
De-encapsulation:
e. Upon receiving the IPv6 packet, Device B delivers it to the IPv6 protocol stack.
f. The IPv6 protocol stack checks the protocol type of the data portion encapsulated in the
IPv6 packet. If the encapsulation protocol is IPv6, the stack delivers the packet to the tunnel
module.
g. The tunnel module de-encapsulates the packet and sends it back to the IPv6 protocol stack.
h. The IPv6 protocol stack forwards the IPv6 packet.

Configuring an IPv6 over IPv6 tunnel

Follow these guidelines when you configure an IPv6 over IPv6 tunnel:
•
The tunnel destination address specified on the local device must be identical with the tunnel
source address specified on the tunnel peer device.
•
Do not specify the same source and destination addresses for local tunnel interfaces in the
same tunnel mode.
•
The IPv6 address of the tunnel interface cannot be on the same subnet as the destination
address configured for the tunnel interface.
IPv6 header
IPv6 data
IPv6 over IPv6 tunnel
Device A
IPv6 header IPv6 data
IPv6 network
Device B
265
IPv6 header IPv6 data
IPv6
network B
IPv6 host