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[ScreenOS] How does VPN monitor detect the VPN is up or down?



Article ID: KB3988 KB Last Updated: 17 Feb 2021Version: 7.0
How does VPN monitor detect if the VPN is up or down?  

If the VPN Monitor 'Optimized' feature is not enabled, then the VPN monitor sends ICMP echo requests every 10 seconds for 10 consecutive times.  If it does not get a reply, then VPN Link status is reported Down.  These settings are configurable using the vpnmonitor interval and vpnmonitor threshold commands:

set vpnmonitor interval <number>

The interval specifies the monitor frequency interval (in seconds)

set vpnmonitor threshold <number>

The threshold specifies the monitor threshold, the number of consecutive times the device can send vpnmonitor requests without getting a response before the device changes the VPN Link-Status to down.

The following command reports the settings:

get vpnmonitor
Vpn monitor interval : 10(seconds)
Vpn monitor threshold: 10
Modification History:
2021-02-07: article reviewed for accuracy; article is correct and complete.
2018-12-27: minor non-technical changes.

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