Bug ID 761753: BIG-IP system incorrectly flags UDP checksum as failed on x520 NICs

Last Modified: Apr 06, 2020

Bug Tracker

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

Known Affected Versions:
13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 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, 13.1.1.1, 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, 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, 14.1.0.4, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 15.0.0, 15.0.1, 15.0.1.1, 15.0.1.2

Fixed In:
15.1.0

Opened: Mar 18, 2019
Severity: 3-Major

Symptoms

When UDP checksum is 0 (zero), a BIG-IP device with an x520 NIC causes the packets to be marked as 'checksum failed'.

Impact

UDP Packets with 0 checksum are dropped.

Conditions

-- Using BIG-IP Virtual Edition (VE). -- VE is using x520 VF.

Workaround

None.

Fix Information

UDP checksum failed packets are marked by the ixvf driver as 'not checksummed by hardware'. This makes software re-verify checksum instead of relying on hardware-indicated checksum pass/fail.

Behavior Change