Bug ID 648320: Downloading via APM tunnels could experience performance downgrade.

Last Modified: Sep 13, 2023

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

Known Affected Versions:
11.6.1, 11.6.2, 11.6.3, 11.6.3.1, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2, 12.1.0, 12.1.1, 12.1.2, 12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5

Fixed In:
14.0.0, 13.1.0.6, 13.0.1, 12.1.3.4, 11.6.3.2

Opened: Mar 01, 2017

Severity: 2-Critical

Related Article: K38159538

Symptoms

Multiple DTLS records can be packed into one UDP packet. When packet size is too large, packet fragmentation is possible at IP layer. This causes high number of packet drops and therefore performance downgrade.

Impact

High number of packet drops and inferior performance.

Conditions

When downloading using APM tunnels.

Workaround

None.

Fix Information

One DTLS record is now contained in each UDP packet to avoid packet fragmentation.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips