Forum Discussion

Stefan_Klotz's avatar
Stefan_Klotz
Icon for Cumulonimbus rankCumulonimbus
May 29, 2019

NAT not working after software update

Hi there, long time ago, that I had a question here. I'm currently working on a F5 project, where we have to perform a hardware refresh including a software update. The old environment consists of...
application delivery
LTM
nat
Oscar_Pucheta's avatar
Oscar_Pucheta
Icon for Cirrus rankCirrus
May 31, 2019

I would think this is related to some stall ARP entry on a networking device. Usually when this is the case I fail over the F5 devices which will indeed send gratuitous ARPs and fix the issue. Make sure all interfaces in the old BIG-IP were indeed shut, I have scenarios where the customer was shutting down interfaces in the switches which were supposed to be connected to the BIG-IP and they were indeed the wrong interfaces, creating chaos in the middle of the cut-over.

 

Best Regards,

Oscar Pucheta

https://www.australtech.net

https://www.linkedin.com/in/npucheta/