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Chapter 2 How to Set Up Your Network
ZyWALL USG 20-2000 User’s Guide
48
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.
Note: For 6to4, you do not need to enable IPv6 in the wan1 since the IPv6 packets will be
redirected into the 6to4 tunnel.
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.
2.8 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 ZyWALLs (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
ZyWALL Z. You can use similar settings to configure ZyWALL Y.
Note: In the IPv6-in-IPv4 tunnel application, you must configure the peer gateway’s WAN
IPv4 address as the remote gateway IP.
2.8.1 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 ZyWALL through the following flow.
Figure 27 IPv6-in-IPv4 Tunnel Configuration Concept
2.8.2 Setting Up the IPv6-in-IPv4 Tunnel
1 Click Add in the CONFIGURATION > Network > Interface > Tunnel screen.
2003:1111:1111:1::1/128
1.2.3.4
2003:1111:1111:1::/64
IPv6
IPv4
Z
5.6.7.8
2004:2222:2222:2::1/128
2004:2222:2222:2::/64
Y
IPv6
WANLAN WAN
LAN
LAN1
(IPv6)
IPv6-in-IPv4
Policy Route
WAN1
(IPv4)
TUNNEL
48


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