113
2 Enable IPv6 support on you computer.
In Windows XP, you need to use the IPv6 install command in a Command Prompt.
In Windows 7, IPv6 is supported by default. You can enable IPv6 in the Control Panel > Network
and Sharing Center > Local Area Connection screen.
3 Your computer should get an IPv6 IP address (starting with 2001:b050:2d:1111: for this example)
from the USG.
4 Open a web browser and type http://www.kame.net. If your IPv6 settings are correct, you can see a
dancing turtle in the website.
1.6.5 What Can Go Wrong?
1 If you forgot to enable Auto-Configuration on the WAN1 IPv6 interface, you will not have any
default route to forward the LAN’s IPv6 packets.
2 To use prefix delegation, you must set the WAN interface to a DHCPv6 client, enable router
advertisements on the LAN interface as well as configure the Advertised Prefix from DHCPv6
Prefix Delegation table.
3 If the Value field in the WAN1’s DHCPv6 Request Options table displays n/a, contact your ISP
for further support.
4 In Windows, some IPv6 related tunnels may be enabled by default such as Teredo and 6to4
tunnels. It may cause your computer to handle IPv6 packets in an unexpected way. It is
recommended to disable those tunnels on your computer.
1.7 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 24 6to4 Tunnel Example
In this example, the USG (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,
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