Bug ID 450001: Flow control added in SIPP filter can cause the filter to silently switched its XOFF state and never initiate the upper layers

Last Modified: Nov 07, 2022

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

Known Affected Versions:
11.1.0, 11.2.0, 11.2.1, 11.3.0, 11.4.0, 11.4.1, 11.5.0, 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

Fixed In:
11.6.0, 11.5.1 HF5, 11.4.1 HF4, 11.2.1 HF11

Opened: Feb 24, 2014

Severity: 2-Critical

Symptoms

Flow control added in SIPP filter can cause the filter to silently switch its XOFF state and never initiate the upper layers (in this case MBLB proxy) through HUDEVT_SENT.

Impact

When a server flow incorrectly shares one of the client flow's connections, this could cause a crash.

Conditions

Flow-control enabled in MBLB SIP.

Workaround

None.

Fix Information

Flow control in the SIPP filter no longer blocks flow improperly.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips