With IPHost Network Monitor you can run simple snmp requests against a Fortinet device in your network.
fnVpnL2TPStatus
fn Vpn L2 TP Status
1.3.6.1.4.1.12356.4.3.1
L2TP status
Back to FORTINET-MIB MIB page.
IPHost Network monitor allows you to monitor fnVpnL2TPStatus on Fortinet device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Fortinet switches right now.