Bug ID 1117637: FastL4 traffic traversing tunnel may fail on VELOS and rSeries tenants

Last Modified: Nov 07, 2022

Bug Tracker

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

Known Affected Versions:
15.1.7,, 15.1.6,, 15.1.5,, 14.1.5,,,,,,, 14.1.4,, 14.1.3

Fixed In:

Opened: Jun 21, 2022
Severity: 3-Major


BIG-IP tenants running on an VELOS or rSeries system may incorrectly attempt to PVA accelerate traffic that goes through a tunnel, i.e. where the pool members are reachable through a VXLAN tunnel.


Connections fail. A packet capture from the F5OS layer shows packets arriving at the system, but not being forwarded through the tunnel. A packet capture in the tenant shows packets arriving at TMM, but with layer 3 and layer 4 headers rewritten to match the serverside connection information.


-- BIG-IP tenant running on VELOS or rSeries -- Virtual server that processes traffic over a tunnel, i.e. a VXLAN tunnel


FastL4 acceleration is not supposed to work for traffic being load-balanced over a tunnel. To mitigate this issue, disable PVA acceleration in the FastL4 profile for virtual servers that will load-balance traffic over a tunnel.

Fix Information


Behavior Change