How To Set Up An Ipv6 6To4 Tunnel - ZyXEL Communications ZyWALL USG100-Plus User Manual

Chapter 2 How to Set Up Your Network
2.5.7 What Can Go Wrong?
If you forgot to enable Auto-Configuration on the WAN1 IPv6 interface, you will not have any
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default route to forward the LAN's IPv6 packets.
To use prefix delegation, you must set the WAN interface to a DHCPv6 client, enable router
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advertisements on the LAN interface as well as configure the Advertised Prefix from DHCPv6
Prefix Delegation table.
If the Value field in the WAN1's DHCPv6 Request Options table displays n/a, contact your ISP
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for further support.
In Windows, some IPv6 related tunnels may be enabled by default such as Teredo and 6to4
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tunnels. It may cause your computer to handle IPv6 packets in an unexpected way. It is
recommended to disable those tunnels on your computer.

2.6 How to Set Up an IPv6 6to4 Tunnel

This example shows how to use the interface configuration screens to create the following 6to4
tunnel.
Figure 22 6to4 Tunnel Example
2002:7a64:dcee:1::/64
In this example, the ZyWALL (Z) acts as a 6to4 router which connects the IPv4 Internet (through
WAN1 with an IP address of 122.100.220.238) and an IPv6 intranet network. In the 6to4 tunnel
application, you must configure the LAN1 with an IP address starting with 2002:7a64:dcee::/48 if
you decide to use the WAN1 IP address to forward 6to4 packets to the IPv4 network. The second
and third sets of 16-bit IP address from the left must be converted from 122.100.220.238. It
becomes 7a64:dcee in hexadecimal. You are free to use the fourth set of 16-bit IP address from the
left in order to allocate different network addresses (prefixes) to IPv6 interfaces. In this example,
the LAN1 network address is assigned to use 2002:7a64:dcee:1::/64 and the LAN1 IP address is
set to 2002:7a64:dcee:1::111/128.
A relay router R (192.99.88.1) is used in this example in order to forward 6to4 packets to any
unknown IPv6 addresses.
2.6.1 Configuration Concept
After the 6to4 tunnel settings are complete, IPv4 and IPv6 packets transmitted between WAN1 and
LAN1 will be handled by the ZyWALL through the following flow.
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Z
LAN
IPv6
2002:7a64:dcee:1::111/128
122.100.220.238
WAN
IPv4
ZyWALL USG100-PLUS User's Guide
R
192.99.88.1