Bug ID 826601: Prevent receive window shrinkage for looped flows that use a SYN cookie

Last Modified: Sep 13, 2023

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

Fixed In:
15.1.0, 15.0.1.3, 14.1.2.3, 13.1.3.4, 12.1.5.1, 11.6.5.2

Opened: Sep 15, 2019

Severity: 2-Critical

Symptoms

TMM cores.

Impact

Traffic disrupted while tmm restarts.

Conditions

-- VIP to VIP (looped flow) configuration. -- SYN cookie is used. -- Initial receive window is greater than 3.

Workaround

-- Set the initial receive window value of the VIP to 3.

Fix Information

Receive window shrinkage is prevented for looped flows using SYN cookies.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips