topic Re: DHCP Lease Issue in General Topics

DHCP Lease Issue

Purushotham — Wed, 29 Mar 2023 01:10:34 GMT

Device details:

Model - PA 3020
Software version - PAN OS – 8.1.3

Problem Description:

Please be informed that we are frequently encounter DHCP lease full (100%), and it cause interruption for our users at region side.
Customer side have two vlan for DHCP lease which are vlan.960 (IP pool of XX.XX.XXX.X to XX.XX.XXX.XXX) and vlan.959(XX.XX.XXX.X to XX.XX.XXX.XXX) on the same management interface.
We already done 1^st level troubleshooting to release the lease but after few days, DHCP lease is full again (100%) for vlan.959.
Is there any way other than releasing the DHCP lease frequently or by increasing subnet range of VLAN.

Re: DHCP Lease Issue

MP18 — Wed, 29 Mar 2023 02:50:05 GMT

@Purushotham

What is the DHCP lease time configured?

Are there more number of PC as compared to the assigned range?

If users are more than DHCP assigned IP range and all of them using Network at same time then you need to increase the IP range.

Regards

Mahesh

Re: DHCP Lease Issue

Purushotham — Fri, 19 May 2023 06:34:37 GMT

Hi Mahesh,

Apologies for late response, Issue Resolved.

Thanks,

Regards,

Purushotham V

Re: DHCP Lease Issue

MP18 — Wed, 31 May 2023 19:23:45 GMT

@Purushotham

What was the fix?

Re: DHCP Lease Issue

Purushotham — Mon, 10 Jul 2023 07:12:29 GMT

Hi @MP18 ,

I will share the complete RCA shortly.

Re: DHCP Lease Issue

KhaleelE — Mon, 17 Jul 2023 06:54:23 GMT

Hi I also having same issue the lease time not expiring from firewall. We have Guest wifi. from the wifi controller the ip is gone but from the firewall that ip still presented. the lease timeout we configured is 2 hours

Re: DHCP Lease Issue

MP18 — Tue, 18 Jul 2023 14:30:09 GMT

@Purushotham Thanks for getting back to us.

Curious to know what was the fix.

Regards

Re: DHCP Lease Issue

emvega — Thu, 05 Sep 2024 16:11:01 GMT

Same here, lease time for 8 hrs, and assigned IP Addresses are still present

How is it possible?

Re: DHCP Lease Issue

WayneRandall — Thu, 26 Jun 2025 15:36:28 GMT

What was the fix?