Bug ID 632838: Deterministic NAT performance may be degraded

Last Modified: Jul 12, 2023

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

Known Affected Versions:
13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1

Fixed In:

Opened: Dec 09, 2016

Severity: 3-Major


Deterministic NAT performance may be degraded compared to performance in 12.1.x.


CPU utilization will be higher, and the system may pass traffic with less speed.


Deterministic NAT configuration in use in version 13.0.


Enable the db variable pva.fwdaccel to see DNAT performance improve with a fastL4 profile.

Fix Information

Deterministic NAT performance and scalability is improved relative to 13.0.0. Forward flow acceleration is always on for Deterministic NAT.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips