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Chapter 7 Interfaces
ZyWALL 110/310/1100 Series User’s Guide
141
• your ZyWALL has a public IPv4 IP address given from your ISP,
and
• you want to transmit your IPv6 packets to one and only one remote site whose LAN network is
also an IPv6 network.
With this mode, the ZyWALL encapsulates IPv6 packets within IPv4 packets across the Internet.
You must know the WAN IP address of the remote gateway device. This mode is normally used for
a site-to-site application such as two branch offices.
Figure 88 IPv6-in-IPv4 Tunnel
In the ZyWALL, 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 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 should get a public IPv4 address for the WAN. The ZyWALL adds an IPv4
IP header to an IPv6 packet when transmitting the packet to the Internet. In reverse, the ZyWALL
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.1E.29. The
IPv6 address prefix becomes 2002:ca9c:1e29::/48.
IPv6
IPv4
IPv6
Internet