With IPHost Network Monitor you can run simple snmp requests against a Fortinet device in your network.
fnVpnDialupMonProxyIdDst
fn Vpn Dialup Monitor Proxy Id Dst
1.3.6.1.4.1.12356.4.1.6.1.6
the actual IP address or subnet address of the local peer.
Back to FORTINET-MIB MIB page.
IPHost Network monitor allows you to monitor fnVpnDialupMonProxyIdDst 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.