Symptoms

CGNAT in deterministic mode translation mappings may fail and use backup pool or may appear to succeed but the reverse mappings using dnatutil will not get the correct source address.

Impact

Deterministic NAT address translations may fail or result in mappings that cannot be reversed correctly.

Conditions

- More than one VS using different source address ranges is attached to the same deterministic LSN pool - A VS with a source address network larger than /16 - may depend on the platform

Workaround

- Reduce the prefix for the source address range to /16 or smaller - use only 1 VS per Deterministic LSN pool - use NAPT mode

Fix Information

CGNAT in deterministic mode translation will no longer fail and use the backup pool.

Behavior Change