Isatap Tunnel - Huawei S9300 Configuration Manual

S9300&S9300E Terabit Routing Switch
Configuration Guide - IP Service
Figure 11-3 6to4 tunnel and 6to4 relay
When the host in Site1 accesses the host in Site2, the process concerned is as follows:
1.
2.
3.
4.
5.

ISATAP Tunnel

The ISATAP tunnel is used when the IPv4/IPv6 host in an IPv4 network accesses an IPv6
network. The ISATAP tunnel can be created between an ISATAP host and an ISATAP device.
The ISATAP format address is needed to create the ISATAP tunnel. Its structure is as follows:
Prefix (64bit)::5EFE:IPv4-Address
When the ISATAP tunnel is created (since the IPv4/IPv6 host and the ISATAP device are in a
same IPv4 network), the IPv4 address embedded into the ISATAP address can be either a public
network address or a private network address.
As shown in
follows:
1.
2.
Issue 01 (2012-03-15)
6to4
Router
6to4
Network
Site1
SwitchA
The IPv6 packet is transmitted to Switch A.
Switch A checks the destination address of the IPv6 packet and finds that the address is the
6to4 address, from which Switch A obtains the remote IPv4 address of the 6to4 tunnel.
Switch A encapsulates this IPv6 packet into the IPv4 packet. The destination address of
IPv4 packet header is the remote IPv4 address of the tunnel, and its source address is the
local IPv4 address of the tunnel.
Switch A forwards the IPv4 packet in the IPv4 network to Switch B.
Switch B decapsulates it to obtain the previous IPv6 packet, and then sends the IPv6 packet
to the destination host in Site2.
Figure 11-4, the process for an IPv4/IPv6 host to obtain an IPv6 address is as
The IPv4/IPv6 host sends a request message to a device.
The IPv4/IPv6 host uses the link-local address in the ISATAP format to send a router
request message to the ISATAP device. It encapsulates the message into the IPv4 packet.
The ISATAP device responds to the request message.
The ISATAP device uses a router notification message to respond to the request. The router
notification message contains the ISATAP prefix, which is manually configured on the
device.
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6to4
6to4
Router
Network
Site2
SwitchB
IPv4
Network
SwitchC
IPv6
Internet
6to4 Site3
Relay
11 IPv6 over IPv4 Tunnel Configuration
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