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Chapter 7 Interfaces
ZyWALL 110/310/1100 Series User’s Guide
140
7.6 Tunnel Interfaces
The ZyWALL uses tunnel interfaces in Generic Routing Encapsulation (GRE), IPv6 in IPv4, and 6to4
tunnels.
GRE Tunneling
GRE tunnels encapsulate a wide variety of network layer protocol packet types inside IP tunnels. A
GRE tunnel serves as a virtual point-to-point link between the ZyWALL and another router over an
IPv4 network. At the time of writing, the ZyWALL only supports GRE tunneling in IPv4 networks.
Figure 86 GRE Tunnel Example
IPv6 Over IPv4 Tunnels
To route traffic between two IPv6 networks over an IPv4 network, an IPv6 over IPv4 tunnel has to
be used.
Figure 87 IPv6 over IPv4 Network
On the ZyWALL, you can either set up a manual IPv6-in-IPv4 tunnel or an automatic 6to4 tunnel.
The following describes each method:
IPv6-in-IPv4 Tunneling
Use this mode on the WAN of the ZyWALL if
Log Select None to not create a log when the ZyWALL takes this action, Log to create a
log, or Log-alert to create an alert log. If you select Log or Log-alert you can also
select recurring every to have the ZyWALL send a log or alert for this event
periodically. Specify how often (from 1 to 65535 minutes) to send the log or alert.
OK Click OK to save your changes back to the ZyWALL.
Cancel Click Cancel to exit this screen without saving.
Table 49 Configuration > Network > Interface > Cellular > Add (continued)
LABEL DESCRIPTION
Internet
IPv4
IPv4
IPv6
IPv6