Last Modified: Apr 10, 2019
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Known Affected Versions:
11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 11.6.1 HF1, 11.6.1 HF2, 11.6.2, 11.6.2 HF1, 11.6.3, 188.8.131.52, 184.108.40.206, 220.127.116.11, 18.104.22.168, 11.6.4, 12.0.0, 12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2
Opened: Apr 19, 2016
Related AskF5 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.)
PEM no longer deletes existing PEM Subscriber Sessions after the lease time expires, so the DHCP renewal is now processed.