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

Forum Discussion

JoeReid's avatar
JoeReid
Icon for Nimbostratus rankNimbostratus
Sep 20, 2019

Does a firmware upgrade reset the MTU/MSS settings on vlans?

Will a firmware upgrade to 12.1.2 have possibly reset the MTU/MSS settings on configured vlans? Customer is adamant that these were not at the default setting.
application delivery
big-ip
LTM
JoeReid's avatar
JoeReid
Icon for Nimbostratus rankNimbostratus
Sep 25, 2019

To be honest, I don't know. (currently running 12.1.2 on a 3600 chassis) I don't believe that the MTU/MSS settings would change on a firmware update, but the customer is absolutely adamant that this is the case, even though they can provide no documentation to support this view.