Last Modified: Jul 18, 2026
Affected Product(s):
BIG-IP CGN
Known Affected Versions:
11.5.1, 11.5.1 hf1, 11.5.1 hf2, 11.5.1 hf3, 11.5.1 hf4, 11.5.1 hf5, 11.5.1 hf6, 11.5.1 hf7, 11.5.1 hf8, 11.5.1 hf9, 11.5.1 hf10, 11.5.1 hf11
Fixed In:
11.6.0, 11.5.2
Opened: Feb 21, 2014 Severity: 2-Critical Related Article:
K15538
Connections may fail when using CGNAT Deterministic NAT (DNAT) with ECMP or route pools.
Second connection fails.
This issue occurs with: -- LSN pool with Deterministic mode. -- Route pools or ECMP such that the same destination may have two different routes. -- Two connections from the same client to the same destination
None.
Deterministic NAT (DNAT) does not pick a colliding port for the second connection, so connections complete successfully.