With IPHost Network Monitor you can run simple snmp requests against a Fortinet device in your network.
fnFirewallIPMACStatus
fn Firewall IPMAC Status
1.3.6.1.4.1.12356.2.7.2
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Back to FORTINET-MIB MIB page.
IPHost Network monitor allows you to monitor fnFirewallIPMACStatus 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.