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3 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.
1.8 How to Set Up an IPv6-in-IPv4 Tunnel
This example shows how to use the interface and policy route configuration screens to create an
IPv6-in-IPv4 tunnel.
Figure 26 IPv6-in-IPv4 Tunnel Example
In this example, the USGs (Z and Y) act as IPv6-in-IPv4 routers which connect the IPv4
Internet and an individual IPv6 network. This configuration example only shows the settings on
USG Z. You can use similar settings to configure USG Y.
Note: In the IPv6-in-IPv4 tunnel application, you must configure the peer gateway’s WAN
IPv4 address as the remote gateway IP.
1.8.1 Configuration Concept
After the IPv6-in-IPv4 tunnel settings are complete, IPv4 and IPv6 packets transmitted between
WAN1 and LAN1 will be handled by the USG through the following flow.
Figure 27 IPv6-in-IPv4 Tunnel Configuration Concept
1.8.2 Setting Up the IPv6-in-IPv4 Tunnel
1 Click Add in the CONFIGURATION > Network > Interface > Tunnel screen.
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