With IPHost Network Monitor you can run simple snmp requests against a Fortinet device in your network.
fnVpnRemoteGWDpdRetryCound
fn Vpn Remote GW Dpd Retry Cound
1.3.6.1.4.1.12356.4.1.4.1.30
There are four options in Dead Peer Detection: Idle Worry, Retry Count, Retry Interval and Idle Cleanup
Back to FORTINET-MIB MIB page.
IPHost Network monitor allows you to monitor fnVpnRemoteGWDpdRetryCound on Fortinet device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Fortinet firewalls right now.