Bug ID 536868: Packet Sizing Issues after Receipt of PMTU

Last Modified: Oct 16, 2023

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

Known Affected Versions:
12.1.0 HF1, 12.1.0 HF2, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2

Fixed In:
12.0.0, 11.6.3.3, 11.5.4 HF3

Opened: Jul 31, 2015

Severity: 4-Minor

Symptoms

TCP sends IP fragments in spite of PMTU message.

Impact

IP fragmentation.

Conditions

BIG-IP has received an ICMP PMTU message.

Workaround

Set the MSS in the TCP profile sufficiently low to avoid inducing ICMP messages in the future.

Fix Information

Properly process ICMP packets.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips