You can configure the TCP window size using the sysctl.conf system file.
You can edit the system file on the Secure Web Gateway interface.
- Select Configuration | File Editor.
- On the files tree, navigate to the branch for the appliance where you want to configure the TCP window size, then select sysctl.conf.
- In the editing area on the right, type parameter names and values for the TCP window size.
Type these entries after this line:
### END AUTOGENERATED CONFIG
Otherwise the parameter values will be overridden by those configured under Configuration | Appliances as part of the proxy system settings.
net.core.rmem_max = <maximum size in KB>— Sets the maximum size of the TCP window, specified as a number (without
This size is the absolute limit. If a larger size is configured using a different method, it is only effective up to the number of bytes configured here.
Alternatively, you can set the maximum size using this parameter:
<maximum size in KB>. This size cannot be exceeded either by using any other configuration method.
If both parameters are entered in the system file,
net.ipv4.tcp.rmem_min = <minimum size in KB>— Sets the minimum size of the TCP window, specified as a number (without KB).
If you configure a value greater than 65535 here, window scaling cannot be disabled by any other setting on Secure Web Gateway.
- Click Save Changes.