Configuring A Tunnel - ZyXEL Communications ZyWALL 110 User Manual

Chapter 9 Interfaces
In the ZyWALL/USG, you must also manually configure a policy route for an IPv6-in-IPv4 tunnel to
make the tunnel work.
6to4 Tunneling
This mode also enables IPv6 packets to cross IPv4 networks. Unlike IPv6-in-IPv4 tunneling, you do
not need to configure a policy route for a 6to4 tunnel. Through your properly pre-configuring the
destination router's IP address in the IP address assignments to hosts, the ZyWALL/USG can
automatically forward 6to4 packets to the destination they want to go. A 6to4 relay router is
required to route 6to4 packets to a native IPv6 network if the packet's destination do not match
your specified criteria.
In this mode, the ZyWALL/USG should get a public IPv4 address for the WAN. The ZyWALL/USG
adds an IPv4 IP header to an IPv6 packet when transmitting the packet to the Internet. In reverse,
the ZyWALL/USG removes the IPv4 header from an IPv6 packet when receiving it from the
Internet.
An IPv6 address using the 6to4 mode consists of an IPv4 address, the format is as the following:
2002:[a public IPv4 address in hexadecimal]::/48
For example, a public IPv4 address is 202.156.30.41. The converted hexadecimal IP string is
ca.9c.1Ee.29. The IPv6 address prefix becomes 2002:ca9c:1e29::/48.
Figure 163 6to4 Tunnel
IPv6
IPv6
IPv4
Internet
IPv6

9.6.1 Configuring a Tunnel

This screen lists the ZyWALL/USG's configured tunnel interfaces. To access this screen, click
Network > Interface > Tunnel.
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