ZyXEL Communications VPN Series Handbook page 723

What Could Go Wrong?
If your IPv6 connection is not working, please make sure you disable Auto-
Configuration on the 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 tunnels. It may cause your computer to handle IPv6 packets in an
unexpected way. It is recommended to disable those tunnels on your computer.
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.
ZyWALL/USG with IPv6-in-IPv4 Tunnel Example
Note: All network IP addresses and subnet masks are used as examples in this article.
Please replace them with your actual network IP addresses and subnet masks. This example
was tested using USG310 (Firmware Version: ZLD 4.25).
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