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1.7.4 Testing the 6to4 Tunnel
1 Connect a computer to the USG’s LAN1.
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 You should get an IPv6 IP address starting with 2002:7a64:dcee:1:.
4 Type ping -6 ipv6.google.com in a Command Prompt to test. You should get a response.
1.7.5 What Can Go Wrong?
1 Do not enable Auto-Configuration for the LAN1 IPv6 interface. Enabling it will cause two default
routes, however, the USG only needs a default route generated by your relay router setting.
In 6to4, the USG doesn’t need a policy route to determine where to forward a 6to4 packet
(starting with 2002 in the IPv6 IP address). The next gateway information of where to forward a
6to4 packet can be retrieved from the packet’s destination IP address. The USG only forwards a
6to4 packet to the relay router using the default route if the packet’s destination is not an IP
address starting with 2002.
2 You don’t need to activate the WAN1 IPv6 interface but make sure you enable the WAN1 IPv4
interface. In 6to4, the USG uses the WAN1 IPv4 interface to forward your 6to4 packets over the IPv4
network.
Note: For 6to4, you do not need to enable IPv6 in the wan1 since the IPv6 packets will be
redirected into the 6to4 tunnel.
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