Forum Discussion

Cirrostratus

Dec 13, 2014

How do I enable the TCP Window Scaling option?

I've been doing some performance tests uploading and download large files over SSL with an F5 LTM in the middle. The virtual server setup is standard, using the default tcp profile. In most per...

nitass_89166
Dec 13, 2014
what version are you running? have you tried to increase send/receive buffer e.g. 65536 bytes?

Note: Beginning in 11.4.0, the window scale functionality is built into the TCP profile and cannot be manually disabled or enabled; it will be negotiated if the send or receive buffer is larger than 65535 bytes.

sol7559: Overview of the TCP profile
https://support.f5.com/kb/en-us/solutions/public/7000/500/sol7559.html

nitass

Employee

what version are you running? have you tried to increase send/receive buffer e.g. 65536 bytes?

Note: Beginning in 11.4.0, the window scale functionality is built into the TCP profile and cannot be manually disabled or enabled; it will be negotiated if the send or receive buffer is larger than 65535 bytes.

sol7559: Overview of the TCP profile

https://support.f5.com/kb/en-us/solutions/public/7000/500/sol7559.html