How many free IP-Addresses are available in the DHCP Pool

[HendStan]

Hello, is it possible to get information from the Fortigate that there are no or only very few IP addresses available from the interface's DHCP pool. FortiAnalyzer or Syslog server is present.

[akristof]

Hello,

Check this KB if it has the information you are looking for:

https://community.fortinet.com/t5/FortiGate/Technical-Tip-How-to-see-the-number-free-IPs-allocated-b...

[srajeswaran]

You may also enable SNMP trap on Fortigate to get an alert when the dhcp pool usage is at 90%.

https://docs.fortinet.com/document/fortigate/6.4.0/new-features/614237/snmp-traps-and-query-for-moni...

[pminarik]

I will add to akristof's reply that there's also events 26005 (LOG_ID_DHCP_LEASE_USAGE_HIGH) and 26006 (LOG_ID_DHCP_LEASE_USAGE_FULL) to signal that the pool utilisation is high, or exhausted, respectively.

You can use these events as triggers in automation stitches, to send an email/IM notification, etc.

https://docs.fortinet.com/document/fortigate/7.2.4/fortios-log-message-reference/26005/26005-log-id-...

https://docs.fortinet.com/document/fortigate/7.2.4/fortios-log-message-reference/26006/26006-log-id-...