Bug ID 536868: Packet Sizing Issues after Receipt of PMTU

Last Modified: Apr 10, 2019

Bug Tracker

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

Known Affected Versions:
11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.5.3 HF2, 11.5.4, 11.5.4 HF1, 11.5.4 HF2, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 11.6.1 HF1, 11.6.1 HF2, 11.6.2, 11.6.2 HF1, 11.6.3, 11.6.3.1, 11.6.3.2

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