Bug ID 626311: Potential failure of DHCP relay functionality credits to incorrect route lookup.

Last Modified: Aug 19, 2026

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

Known Affected Versions:
12.1.0, 12.1.0 hf1, 12.1.0 hf2, 12.1.1, 12.1.1 hf1, 12.1.1 hf2, 12.1.2, 12.1.2 hf1, 12.1.2 hf2, 12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 12.1.3.6, 12.1.3.7, 12.1.4, 12.1.4.1, 12.1.5, 12.1.5.1, 12.1.5.2, 12.1.5.3, 12.1.6, 13.0.0, 13.0.0 hf1, 13.0.0 hf2, 13.0.0 hf3, 13.0.1

Fixed In:
13.1.0

Opened: Nov 01, 2016

Severity: 2-Critical

Related Article: K75419237

Symptoms

DHCP requests from client to server may not make it through.

Impact

Clients might not get an IP address from the DHCP server.

Conditions

-- BIG-IP system configured as a DHCP relay. -- Input variable (flow_key) incorrectly initialized.

Workaround

None.

Fix Information

Input variable (flow_key) is initialized properly to prevent a potential route-lookup failure.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips