Bug ID 674328: Multicast UDP from BIG-IP may have incorrect checksums

Last Modified: Sep 13, 2023

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

Known Affected Versions:
11.6.1, 11.6.2, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 11.6.5, 11.6.5.1, 11.6.5.2, 11.6.5.3, 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, 12.1.2, 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: Jul 17, 2017

Severity: 3-Major

Symptoms

BIG-IP may transmit UDP datagrams with a bad checksum.

Impact

Packets may be dropped by adjacent devices.

Conditions

Outgoing link-local multicast UDP traffic from the Linux host, such as RIP.

Workaround

Disable checksum offloading on the virtual NIC for affected VLANS, e.g. "ethtool --offload vlan1274 rx on tx off"

Fix Information

Link-local multicast UDP packets are no longer sent with incorrect checksums.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips