ZyXEL Communications VPN Series Handbook page 718

Security firewalls
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What Could Go Wrong?
If your IPv6 connection is not working, please make sure you enable Auto-
Configuration on the WAN1 IPv6 interface. If not, you will not have any default
route to forward the LAN's IPv6 packets.
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 6to4 Tunnel
This example shows how to configure your ZyWALL/USG to create IPv6 6to4 Tunnel.
In this example, the ZyWALL/USG acts as a 6to4 router which connects the IPv4.
After configuration, the ZyWALL/USG can assign an IPv6 to clients behind it and
pass IPv6 traffic through IPv4 environment to access remote IPv6 network.
ZyWALL/USG with IPv6 6to4 Tunnel Example
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