What Can Go Wrong; How To Set Up An Ipv6-In-Ipv4 Tunnel - ZyXEL Communications ZyWALL 110 Handbook

Enable IPv6 support on your computer. In Windows XP, you need to use the IPv6 install command in
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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.
Your computer should get an IPv6 IP address (starting with 2002:7a64:dcee:1: in this example)
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from the ZyWALL/USG.
Figure 638 Window 7 > cmd > ipconfig
Type ping -6 ipv6.google.com in a Command Prompt to test. You should get a response.
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Figure 639 Window 7 > cmd > ping -6 ipv6.google.com

6.2.4 What Can Go Wrong?

If your IPv6 connection is not working, please make sure you disable Auto-Configuration on the
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LAN1 IPv6 interface. Enabling it will cause two default routes, however, the ZyWALL/USG only
needs a default route generated by your relay router setting. Also, make sure you enable the WAN1
IPv4 interface. In 6to4, the ZyWALL/USG uses the WAN1 IPv4 interface to forward your 6to4
packets over the IPv4 network.
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.

6.3 How to Set Up an IPv6-in-IPv4 Tunnel

This example shows how to configure your ZyWALL/USG to create IPv6-in-IPv4 Tunnel. In this
example, the ZyWALL/USG acts as IPv6-in-IPv4 routers which connect the IPv4 Internet and an
individual IPv6 network. This configuration example only shows the settings on ZyWALL/USG_Z.
You can use similar settings to configure ZyWALL/USG_Y.
Chapter 6 Configure IPv6
ZyWALL/USG Series User's Guide
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