Billion BiPAC 8900X R3, User Manual, Page: 162 / 261

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IPSec Lifetime: Specify the number of minutes that IPSec will stay active before new encryption
and authentication key will be exchanged. Enter a value to negotiate and establish secure
authentication. Default is 60 minutes (3600 seconds). A short time increases security by forcing the
two parties to update the keys. However, every time when the VPN tunnel re- negotiates, access
through the tunnel will be temporarily disconnected.
Ping for Keep Alive: Select the operation methods:
None: The default setting is “None”. To this mode, it will not detect the remote IPSec peer
has been lost or not. It only follows the policy of Disconnection time after no traffic, which the
remote IPSec will be disconnected after the time you set in this function.
DPD:
Dead peer detection (DPD) is a keeping alive mechanism that enables the router to be
detected lively when the connection between the router and a remote IPSec peer has lost.
Please be noted, it must be enabled on the both sites.
Detection Interval: The period cycle for dead peer detection. The interval can be 180~86400
seconds.
Idle Timeout: Auto-disconnect the IPSec connection after trying several consecutive times.
Ping:
This mode will detect whether the remote IPSec peer has lost or not by pinging specify IP
address.
Ping IP: Type the IP for ping operation. It is able to IP Ping the remote PC with the specified IP
address and alert when the connection fails. Once alter message is received, Router will drop this
tunnel connection. Reestablish of this connection is required. Default setting is 0.0.0.0 which
disables the function.
Interval: This sets the time interval between Pings to the IP function to monitor the connection
status. Default interval setting is 10 seconds. Time interval can be set from 0 to 3600 second, 0
second disables the function.
MTU: Maximum Transmission Unit, maximum value is 1500.