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Chapter 9 Interfaces
USG20(W)-VPN Series User’s Guide
184
IPv6-in-IPv4 Tunneling
Use this mode on the WAN of the USG if
• your USG 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 USG 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 132
IPv6-in-IPv4 Tunnel
In the 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 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 USG should get a public IPv4 address for the WAN. The USG adds an IPv4 IP
header to an IPv6 packet when transmitting the packet to the Internet. In reverse, the 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.
IPv6
IPv4
IPv6
Internet
Summary of Contents for ZyWall USG20-VPN
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Page 99: ...99 PART II Technical Reference ...
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