Cheatsheet FortiGate CLI


Cheatsheet for FortiGate Command Line Interface CLI.

This article contains some useful FortiGate commands. Please note that not all commands work on all FortiGate versions. Not all commands are supported and some do change.

General Tips

  • If you want to see the whole configuration type in show full-config
  • You can use the grep utility to filter output from commands.
    • Use grep -f to show the the context of the grepped item.

External support (Fortinet)

  • Generate a TAC report: exec tac report
  • Get crash log: diag debug crashlog read shows the crashlog in a readable format.



  • Show system status: get system status

Open Network Connections

  • List open networking ports: diagnose sys tcpsock


  • Show performance usage: get system performance status
  • Show top: get system performance top, use SHIFT+M to sort on memory usage.
  • Show top with grouped processes: diagnose sys top-summary
    • Use diagnose sys top-summary -h to show the help message for top-summary
  • Show shared memory information: diagnose hardware sysinfo shm
    • Look if conservemode is 1.


LDAP / Radius Authentication

  • Use the following commands to debug LDAP or Radius:
diagnose debug enable
diagnose debug application fnbamd -1 

High Availability

  • Show HA status: get system ha status
  • Show HA checksum: get system checksum status
  • Manage other cluster member through HA interface: exec ha manage 0/1
  • Show a HA diff: diagnose sys ha hadiff status
  • Execute a fail-over: diagnose sys ha reset uptime

Object Management

  • Find object dependencies for object (example): diag sys checkused port1


  • Set a log filter: execute log filter
  • Show log: exec log show

Layer 1 (Physical Layer)

Network Interface Card

  • Show all NIC's: config system interface
  • Show hardware info for NIC: diagnose hardware deviceinfo nic
  • Show device information for specific NIC: diagnose hardware deviceinfo nic <nic>

Layer 2 (Data Link Layer)

Address Resolution Protocol (ARP)

  • Show ARP table: get system arp
  • View ARP cache: diag ip arp list
  • Clear ARP cache: execute clear system arp table
  • Remove a single ARP table entry: diag ip arp delete <interface name> <IP address>
  • Add static ARP entries: config system arp-table

Layer 3 (Network Layer)

Internet Protocol

  • Execute a ping: exec ping <dst>
  • Set specific ping options: exec ping-options
    • Set specific source IP: exec ping-options source
  • Execute a telnet: exec telnet ip:port


  • Show routing table: get router info routing-table all
  • Show routing database: get router info routing-table database
  • Get routing information for specific <host>: get router info routing-table details <host>
  • Execute a traceroute: exec traceroute

Poor man's traceroute

If you would like to test a traceroute for a different source IP than the one assigned to your outbound interface you can use poor-mans-traceroute.

Use this procedure:

  1. Open a second ssh session and filter on the outbound interface for icmp
  2. Set the execute ping-options timeout to 1.
  3. Set the execute ping-options source to your source IP.
  4. Ping the target host.
  5. Observer the ICMP time to live exceeded message you get from the first router.
  6. Increase the timeout to 2 and repeat from step 4.


Use Fortinet's recommended procedure to debug OSPF:

  • Show OSPF neighbor status: get router info ospf neighbor all
  • Delete all OSPF entries: execute router clear ospf process
  • Show OSPF router status: get router info ospf status
  • Dump OSPF packets on any interface: diagnose sniffer packet any 'proto 89' 4 0
  • Show OSPF interface: get router info ospf interface.
  • Show OSPF database: get router info ospf database brief


  • Show list of IPSEC VPN tunnels: get vpn ipsec tunnel summary

  • Show details for IPSEC VPN tunnel: get vpn ipsec tunnel detail

  • Debug IKE:

    diag debug application ike 63 
    diagnose vpn ike log-filter clear
    diagnose vpn ike log-filter dst-addr
    diagnose debug app ike 255
    diagnose debug enable

Look for:

  • SNMP tunnel UP / Down traps
  • Own and remote proposal

Geo IP Information

  • Show Geo IP IP address list: diagnose firewall ipgeo ip-list
  • Show Geo IP countries: diagnose firewall ipgeo country-list
  • Update Geo IP addresses: execute update-geo-ip

Layer 4 (Transport Layer)


  • Show session table: diagnose sys session list
  • Show session table with statistics: diagnose firewall statistics show
  • Short list for session table: get system session list

Session List Filters

It is possible to set filters for the session list.

  • Clear session list filter: diagnose sys session filter clear
  • Show possible session list filters: diagnose sys session filter ?
  • Set session filter for destination IP: diagnose sys session filter dst
  • Set session filter for destination port: diagnose sys session filter dport 53

Traffic Flow through FortiGate

  • Use traffic flow to debug FortiGate policy problems such as NAT.
        diagnose debug enable
        diagnose debug flow show console enable
        Diag debug flow show function enable
        diagnose debug flow filter add
        diagnose debug flow trace start 100


  • Dump packets on interface: diagnose sniffer packet <interface> '<tcpdump filter>'

Packets with TCP RST flag set:

diagnose sniffer packet internal 'tcp[13] & 4 != 0'

Packets with TCP SYN flag set:

diagnose sniffer packet internal 'tcp[13] & 2 != 0'

Packets with TCP SYN ACK flag set:

diagnose sniffer packet internal 'tcp[13]=18'

Packets with TCP SYN and TCP ACK

diagnose sniffer packet internal 'tcp[13] = 18'

Layer 5 (Session Layer)


  • Show possible diagnose commands: diagnose test application ssl 0
  • Show SSL proxy usage: diagnose test application ssl 4
  • Show info per connection: diagnose test application ssl 44

Fortinet Single Sing On (FSSO)

  • Debug FSSO:
diag debug enable
diag debug authd fsso list
diag debug authd fsso server-status
diag debug authd fsso-summary

Layer 7 (Application Layer)


  • Show user list: diagnose wad user list
  • Test HTTP proxy: diagnose test application http
  • Enable console log for proxy:
        execute log filter dump
        execute log filter category 0
        execute log filter field hostname
        execute log display


  • Show list of FortiGuard server: diag debug rating


  • Update Antivirus Database: execute update-now


  • Use diagnose test application ipsmonitor ? to get a menu for the IPS monitor.
  • Show DoS anomaly list diagnose ips anomaly list