Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

rafaelbn_176840's avatar
rafaelbn_176840
Icon for Altocumulus rankAltocumulus
Apr 09, 2019

BIG-IP CGNAT Module - General Questions

Hello Devs! We're deploying a high performance VE running only the CGNAT module. Our client asked some tricky questions that I could not find the answer on the documentation. Could you guys have a ...
application delivery
big-ip
cgnat
TMOS
rafaelbn's avatar
rafaelbn
Icon for Cirrostratus rankCirrostratus
Apr 09, 2019

Opened a ticket with F5. The answers are:

 

1- It's random. BIG-IP will use a random IP/Block that is not currently already in use.

 

2- BIG-IP do not have any other message. When you get a block, a LSN-ALLOCATE is logged. When it's release you get an LSN-RELEASE. If the subscriber is always on, you're not going to see any other logs.