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Field Name
Description
STUN Server Maximum
Enter the maximum keepalive time in seconds. Options are any integer. The default is -
Keep Alive Period *
1 (no maximum time).
STUN Server Minimum
Enter the maximum keepalive time in seconds. Options are any integer. The default is
Keep Alive Period *
0.
* This mechanism is used in coordination with the refreshing of NAT bindings. Specifically, in conjunction with use of Restricted Cone
NAT or Port Restricted Cone NAT (as may be configured in some gateways). A device's internal address / port mappings, which the
STUN protocol is allowed to make use of, can have keep alive values attributed. These minimum and maximum keep alive times
define respectively, the minimum time to retain the mapping information STUN has discovered, and the maximum time to retain
that information, before refreshing it through forced re-discovery.
Which values are appropriate for these two fields is influenced by a variety of environmental factors including devices types
deployed, services employed and NAT configuration options enabled within the topology.
With the above-mentioned NAT schemes, it is possible the network address translation initially established may not be used after a
specified elapsed time. Such internal mapping is dropped. The gateway will then assign a different address mapping. This mech-
anism allows for coordinated refresh on the bindings for mappings it uses. For further information, review STUN-related RFCs.
Internet Time
On this page, you can configure the gateway to synchronize its time with the Internet time servers. This feature is enabled by
default.
1. In the left navigation bar, click
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Management
>
Internet
Time. The following page appears.
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