This article provides the required steps to configure the speed and duplex parameters in an Ethernet interface of Kerio Control; this is helpful when troubleshooting issues related to slowness in the network, high CPU caused by overruns and underruns, etc.
Typically, the port's speed and duplex parameters of Ethernet interfaces are negotiated and set automatically between hardware devices. However, some hardware devices do not auto-detect speed and duplex settings, but instead, use hardcoded and user-defined values. In this case, when Kerio Control attempts to auto-detect the speed of connected devices, it fails; this results in packet loss and reduced interface speed.
To optimize the Internet connection, it is crucial to find the correct speed and duplex mode for the device, and configure these values in Kerio Control.
Note: Changing the speed and duplex settings must be done separately for each interface.
In Kerio Control's administration interface, go to Interfaces.
Right-click the interface you want to configure.
In the context menu, choose Configure port.
In the Configure Port window, choose the speed and duplex settings you see fit in the Speed and duplex drop-down menu.
Note: For Kerio Control Software Appliance, some values may not be supported.
Click Apply. Once saved, changes will take effect.
After the changes have been saved, the speed of the Internet connection and duplex mode is the same as on the other hardware device.