Uploads through the ProxySG could be slower compared to without proxy due to TCP Window Size
Due to compatibility issues with network devices that do not support RFC-1323, SGOS running the following versions and above will only selectively enable RFC-1323:
- SG 18.104.22.168
- SG 22.214.171.124
- SG 126.96.36.199 and newer SG 6.x versions
Earlier versions have RFC-1323 enabled with the TCP Window Scale value of 6.
When RFC-1323 is not enabled or enabled but uses the Window Scale value of 1, it could render the upload process slower due to network latency and SG not able to utilize the larger TCP Window.
To overcome this, with the possibility of failure in accessing sites that do not support the Window Scale TCP Option used by RFC-1323, ensure RFC-1323 is enabled, increase the TCP Window Size appropriately. Restart the ProxySG if the settings do not take effect.
Enter configuration commands, one per line. End with CTRL-Z.
SG200#(config)tcp-ip rfc-1323 enable
SG200#(config)tcp-ip window-size ?
SG200#(config)tcp-ip window-size 393215
The default value is 65535
The maximum acceptable value is 4194304