TCP Quick ACK (more) questions
Hello! As i was doing research for SMB/DFS slowness issues on ZPA, i came across some previous posts discussing TCP Quick ACK ([1], [2]).
I am in a similar situation, where i have tried just about every recommendation from Zscaler and Reddit: dedicated App Connectors for SMB, TCP Quick ACK enabled on the App Connector Group, SMB 2 vs 3, Private Service Edge, various ZCC versions; no joy.
I raised a support case with Zscaler and i was told that they can enable TCP Quick ACK in the backend, typically kept as an optimization enabled only when needed.
The way it was presented to me, this is a tenant-level setting, which will apply broadly to all ZPA TCP traffic.
I was encouraged that there should not be any noticeable issues, other than a slight increase in ACK traffic that could potentially lead to a increased CPU/memory/network consumption.
As this is a global setting, i was wondering if anyone in the community has it enabled in their tenant and noticed any improvements from enabling it, or has faced any issues after enabling it.
Thank you!