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

Last Modified: Jul 12, 2023

Affected Product(s):
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,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,,,, 13.1.4,, 13.1.5,, 14.0.0,,,,,, 14.0.1,, 14.1.0,,,,,, 14.1.2,,,,,,,, 15.0.0, 15.0.1,,,,

Fixed In:

Opened: Mar 18, 2019

Severity: 3-Major


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


UDP Packets with 0 checksum are dropped.


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



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

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips