Chapter 10 Interfaces
ZyWALL USG Series User’s Guide
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10.8 Tunnel Interfaces
The Zyxel Device 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 Zyxel Device and another router over an IPv4
network. At the time of writing, the Zyxel Device only supports GRE tunneling in IPv4 networks.
Figure 258 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 259 IPv6 over IPv4 Network
On the Zyxel Device, you can either set up a manual IPv6-in-IPv4 tunnel or an automatic 6to4 tunnel. The
following describes each method:
Log Select None to not create a log when the Zyxel Device 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 Zyxel Device 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 Zyxel Device.
Cancel Click Cancel to exit this screen without saving.
Table 116 Configuration > Network > Interface > Cellular > Add / Edit (continued)
LABEL DESCRIPTION
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