RWIN CheckBox

When this box is checked, pressing the "Basic Settings" or "Optimum Settings" buttons allows RWIN to be automatically enabled.

If the box is unchecked, neither the "Basic Settings" nor "Optimum Settings" buttons will enable RWIN.

If you are NOT attached to a TCP LAN you should check this box (see below). If you are attached to a TCP LAN you should leave this box unchecked to prevent the RWIN value (which is a multiple of the MSS belonging to the currently displayed TCP key) affecting the performance of your Network.

Figure: RWIN Checkbox in the "enabled" state