With IPHost Network Monitor you can run simple snmp requests against a Fortinet device in your network.
fnVpnL2TPStartIp
fn Vpn L2 TP Start Ip
1.3.6.1.4.1.12356.4.3.3
Starting IP of L2TP range
Back to FORTINET-MIB MIB page.
IPHost Network monitor allows you to monitor fnVpnL2TPStartIp on Fortinet device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Fortinet WAN extenders right now.