Chapter 2 How to Set Up Your Network
ZyWALL USG100-PLUS User’s Guide
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2.6.5 Set Up an IPv6 6to4 Tunnel Video Example
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2.6.6 What Can Go Wrong?
1 Do not enable Auto-Configuration for the LAN1 IPv6 interface. Enabling it will cause two default
routes, however, the ZyWALL only needs a default route generated by your relay router setting.
In 6to4, the ZyWALL 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 ZyWALL 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 ZyWALL uses the WAN1 IPv4 interface to forward your 6to4 packets over the
IPv4 network.
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