Chapter 9 Interfaces
USG20(W)-VPN Series User’s Guide
183
9.6 Tunnel Interfaces
The USG 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 USG and another router over an IPv4
network. At the time of writing, the USG only supports GRE tunneling in IPv4 networks.
Figure 130
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 131
IPv6 over IPv4 Network
On the USG, you can either set up a manual IPv6-in-IPv4 tunnel or an automatic 6to4 tunnel. The
following describes each method:
Actions when over
% of time budget or
% of data budget
Specify the actions the USG takes when the specified percentage of time budget or
data limit is exceeded. Enter a number from 1 to 99 in the percentage fields. If you
change the value after you configure and enable budget control, the USG resets the
statistics.
Log
Select
None
to not create a log when the USG 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 USG 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 USG.
Cancel
Click
Cancel
to exit this screen without saving.
Table 72
Configuration > Network > Interface > Cellular > Add / Edit (continued)
LABEL
DESCRIPTION
Internet
IPv4
IPv4
IPv6
IPv6
Summary of Contents for ZyWall USG20-VPN
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