Bug ID 726058: DHCP in forwarding mode decrements the received DHCP client side IP TTL prior to forwarding the packets towards the DHCP server

Last Modified: Sep 14, 2023

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

Known Affected Versions:
13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 13.1.3, 13.1.3.1, 13.1.3.2, 13.1.3.3, 13.1.3.4, 13.1.3.5, 13.1.3.6, 13.1.4, 13.1.4.1, 13.1.5, 13.1.5.1, 14.0.0, 14.0.0.1, 14.0.0.2, 14.0.0.3, 14.0.0.4, 14.0.0.5, 14.0.1, 14.0.1.1, 14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 14.1.2.5, 14.1.2.6, 14.1.2.7, 14.1.2.8, 14.1.3, 14.1.3.1, 14.1.4, 14.1.4.1, 14.1.4.2, 14.1.4.3, 14.1.4.4, 14.1.4.5, 14.1.4.6, 14.1.5, 14.1.5.1, 14.1.5.2, 14.1.5.3, 14.1.5.4, 14.1.5.6, 15.0.0, 15.0.1, 15.0.1.1, 15.0.1.2, 15.0.1.3, 15.0.1.4

Opened: Jun 28, 2018

Severity: 3-Major

Symptoms

DHCP packet dropped by the DHCP relay agent after the BIG-IP system, if the DHCP clientside packet received by the BIG-IP system has a TTL of 1.

Impact

Loss of DHCP service via the BIG-IP system.

Conditions

-- BIG-IP system configured as a DHCP forwarder. -- DHCP client side packet received with a TTL of 1.

Workaround

To mitigate this issue, have the DHCP client send a DHCP request with an IP TTL greater than or equal to 2.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips