Bug ID 588456: PEM deletes existing PEM Subscriber Session after lease time expires (DHCP renewal not processed).

Last Modified: Sep 13, 2023

Affected Product(s):
BIG-IP PEM(all modules)

Known Affected Versions:
11.6.0, 11.6.1, 11.6.2, 11.6.3,,,,, 11.6.4, 11.6.5,,,, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2, 12.1.0, 12.1.1

Fixed In:
13.0.0, 12.1.2

Opened: Apr 19, 2016

Severity: 3-Major

Related Article: K60250444


When the BIG-IP system is in DHCP forwarding mode, if the giaddr field in the unicast DHCP renewal packet is set to DHCP relay agent IP address, the DHCP server sends the ACK to the renewal packet to the relay agent IP (giaddr) instead of ciaddr. BIG-IP DHCP module does not process the ACK and update the lease time, which causes PEM subscriber session to be aged out.


PEM Subscriber Session will age out.


-- The BIG-IP system is configured in forwarding mode. -- The giaddr field in the unicast DHCP renewal packet is set to the IP address of relay agent. (Typically, it is set to 0 by the DHCP client.)



Fix Information

PEM no longer deletes existing PEM Subscriber Sessions after the lease time expires, so the DHCP renewal is now processed.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips