Bug ID 804157: ICMP replies are forwarded with incorrect checksums causing them to be dropped

Last Modified: Sep 13, 2023

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

Known Affected Versions:
13.1.3,,,,,,, 13.1.4,, 13.1.5,, 14.0.0,,,,,, 14.0.1,, 14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 16.0.0,, 16.0.1,

Fixed In:
16.1.0,, 15.1.3, 14.1.4

Opened: Jul 11, 2019

Severity: 4-Minor


If a FastL4 virtual server receives an ICMP response without first receiving an ICMP request, the checksum on the ICMP response that is egressed by tmm will not be calculated correctly.


ICMP replies are forwarded with the incorrect checksum and likely will be dropped by the recipient or other devices on the network.


An ICMP response without a corresponding ICMP request, such as in non-symmetric routing scenarios.


Ensure symmetric routing. Configure L7 virtual servers for use with ipother profiles.

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips