Ipv4 Over Ipv6 Tunneling; Overview; Implementation; Tunnel Modes - HPE FlexNetwork 10500 Series Configuration Manual

IPv4 over IPv6 tunneling

Overview

Implementation

IPv4 over IPv6 tunneling adds an IPv6 header to IPv4 packets so that the IPv4 packets can pass an
IPv6 network through a tunnel to realize interworking between isolated IPv4 networks.
Figure 96 IPv4 over IPv6 tunnel
IPv4 header
IPv4 network
IPv4 host
Figure 96 shows the encapsulation and de-encapsulation processes.
•
Encapsulation:
a. Upon receiving an IPv4 packet, Device A delivers it to the IPv4 protocol stack.
b. The IPv4 protocol stack uses the destination address of the packet to determine the egress
interface. If the egress interface is the tunnel interface, the IPv4 protocol stack delivers the
packet to the tunnel interface.
c. The tunnel interface adds an IPv6 header to the original IPv4 packet and delivers the packet
to the IPv6 protocol stack.
d. The IPv6 protocol stack uses the destination IPv6 address of the packet to look up the
routing table, and then sends it out.
•
De-encapsulation:
e. Upon receiving the IPv6 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.
f. If the protocol type is IPv4, the IPv6 protocol stack delivers the packet to the tunneling
module.
g. The tunneling module removes the IPv6 header and delivers the remaining IPv4 packet to
the IPv4 protocol stack.
h. The IPv4 protocol stack forwards the IPv4 packet.

Tunnel modes

Only the IPv4 over IPv6 manual tunnel mode is available.
An IPv4 over IPv6 manual tunnel is a point-to-point link and its source and destination IPv6
addresses are manually configured. You can establish an IPv4 over IPv6 manual tunnel to connect
isolated IPv4 networks over an IPv6 network.
IPv6 header
IPv4 data
IPv4 over IPv6 tunnel
Device A
IPv4 header IPv4 data
IPv6 network
Device B
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IPv4 header IPv4 data
IPv4 network
IPv4 host