With IPHost Network Monitor you can run simple snmp requests against a Fortinet device in your network.
fnSysStatusOpMode
fn Sys Status Operation Mode
1.3.6.1.4.1.12356.1.1.1
FortiNet product can have two operation modes: NAT and transparent
Back to FORTINET-MIB MIB page.
IPHost Network monitor allows you to monitor fnSysStatusOpMode 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.