Viewing DHCP leases

[ememachado]

How can I see all IPs assigned by DHCP for all Firewall vLans? I used pfSense a lot and there is an option in the Menu with DHCP leases. Is there this option in Fortigate?

[fricci_FTNT]

Hi @ememachado,

You may find helpful the article https://community.fortinet.com/t5/FortiGate/Technical-Tip-DHCP-address-leases-on-a-FortiGate/ta-p/19...

With the command 'execute dhcp lease-list' in CLI you should see the DHCP leases.

Best regards,

[ememachado]

Running this command, it doesn't show all of them. I've already tried.

[fricci_FTNT]

When you say "it doesn't show all of them" do you mean that some IP within the same VLAN/subnet is missing or that some interface/VLAN is missing in the list (so no IPs are showed for that subnet)?

Which FortiGate firmware version are you running? Are you using VDOMs?

Best regards,

[ememachado]

It's strange... It should show everything. There are IPs in the vLans that are not listed.
FortiOS 7.0 GUI Tips and Tricks
Note: I was able to find the IP and machine I needed. So I'll take my time to see why I'm not listing it. Now I'm going to work on the machine solution. Thank you very much for now!

[AEK]

From CLI: exec dhcp lease-list

From GUI: Dashboard > Network, add DHCP widget, the expend it.

[ememachado]

All vLans IPs do not appear on the Dashboard, the view is limited. Is there somewhere that shows all IPs?

[AEK]

FG GUI and CLI show all IPs assigned by FG's DHCP servers in all VLANs.

If some IP is not listed it means FG didn't assign this IP.

[ememachado]

You are sure. I will analyze the client's network. I don't think he gave me all the information I needed about his environment. I think that in addition to FortiGate there is another DHCP there.

FortiOS 7.0 GUI Tips and Tricks
Note: I was able to find the IP and machine I needed. So I'm going to take my time to see why I'm not listing it. Now I'm going to work on the machine solution. Thank you very much for now!

[esalija]

Hi @ememachado ,

Please specify the FortiOS version that you are running.

For more details follow the doc and above KBs  - https://docs.fortinet.com/document/fortigate/7.4.1/administration-guide/38214/dhcp-monitor

Best regards,

Erlin