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Show WAN interface public IPs
(2025-06-05) diagnose system waninfo ipify
Show FQDN IPs in DNS Cache
(2025-06-04) diagnose firewall fqdn list-ip diagnose firewall fqdn list-all dia firewall fqdn li...
Memory Use
(2025-05-13) top-mem: #diag sys top-mem node (165): 44189kB forticron (173): 29644kB ipshelper (...
DHCP Debugging
(2025-04-29) Debug Fortigate as DHCP client: diag debug reset diag debug application dhcpc -1 dia...
OSPF Troubleshooting
(2025-04-28) diag sniffer packet any "proto 89" 6 0 l diag sniffer packet any "host 224.0.0.5" ...
BGP Neighbours -- Advertised, Received, and Learned
(2025-04-24) What routes are we sending to a neighbor? get router info bgp neighbors <neighbor IP...
Tac Report
(2025-04-15) To generate a Tac report: # exec tac report Alternatively, go to System Settings F...
Debug sdwan
(2025-03-31) # di sys sdwan member Member. service ...
Enable the SSLVPN GUI Menus
(2025-03-31) (..or, we don't want you using this but if you insist:) Enable the GUI menus: config...
Export Logs From Fortigate Disk Over FTP
(2025-03-18) # execute backup disk alllogs ftp <IP_address> <username> <password> <compressed | u...
Check Geo-IP Region For A Specific IP
(2025-01-31) FGVM # di geoip ip2c 147.45.47.173 147.45.47.173 - Netherlands, is not anycast ip F...
Looking at logs via CLI
(2024-11-28) fw # exec log filter category Category. device Device to ...
IPsec MTU Varies By Encryption Algorythm
(2024-11-13) Stronger encryption algorithms equals to lower MTU values. For example, the FortiGat...
Link Monitor
(2023-11-15) Example Link Monitor Configuration config system link-monitor edit "VLAN601" set src...
CLI Policy Lookup
(2024-02-06) Problem CLI way to duplicate the "policy lookup" tool Solution diagnose firewall ipr...
Device Table Size Maximum
(2023-02-21) How many can I define? On the device in question: fgt300d-a # print tablesize syste...
Device-Local Certificate Expired
(2024-02-08) Problem The local, internally generated certificate that the Fortigate presents for ...
FortiClient Error Codes
(2020-03-24) Problem What does this error code that FortiClient SSLVPN is giving me? Solution If ...
VPN Tunnel Interface Address
(2020-01-11) Problem If you try to put an IP address on a VPN tunnel interface, the minimum netma...
SD-WAN Diagnostics
(2022-06-17) Problem SD-WAN no workie. Solution You can probably figure out information from some...