The Diego Cell Disable Checksum Offloading setting was not found in EAR v10.2.9, specifically in the EAR settings->Advanced Features tab.
Elastic Application Runtime
From TAS versions 10.2.9 and 10.3.6, the Diego Cell Disable Checksum Offloading setting can now be found in EAR settings->Networking tab.
In previous versions (10.2.8 and 10.3.5) when the setting was added, it was under EAR ettings->Advanced Features.
In TAS versions 10.2.9 and 10.3.6, or above, locate the Diego Cell Disable Checksum Offloading setting in the EAR settings->Networking tab.