Zyxel ZyWALL USG 2000 [47/150] Testing the 6to4 tunnel

Chapter 2 How to Set Up Your Network

ZyWALL USG 20-2000 User’s Guide

2.7.4 Testing the 6to4 Tunnel

1 Connect a computer to the ZyWALL’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.

2.7.5 What Can Go Wrong?

1 Do not enable Auto-Configuration for the LAN1 IPv6 interface. Enabling it will cause two default

routes, however, the 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.