Bug ID 624091: DHCP relay is not forwarding all of the DHCPOFFERS to clients

Last Modified: Oct 06, 2020

Bug Tracker

Affected Product:  See more info
BIG-IP PEM(all modules)

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

Fixed In:
11.6.1 HF2

Opened: Oct 20, 2016
Severity: 3-Major

Symptoms

When upgrading from v11.5.3 to v11.6.1, DHCPOFFER packets got silently dropped.

Impact

BIG-IP will stop to relay DHCPOFFER and DHCPACK back to DHCP clients

Conditions

If DHCP clients send broadcast DHCP packets with non-zero unicast source IP address via BIG-IP, and regular DHCP discovery packets(0.0.0.0 source IP addrees), multiple client connection flows are created, after some are aged out, BIG-IP may stop relay DHCP server replies back to clients.

Workaround

Manually delete all system connection flows by doing "delete sys conn" under tmsh.

Fix Information

None

Behavior Change