The MTU (maximum transmission unit) is the maximum size of an IP packet that can be transmitted without fragmentation. If your network device requires a specific MTU (as, for example, some types of modems do), you can define the MTU in the Kerio Control interface.
- In the administration interface, go to Interfaces.
- Double-click on the interface.
- In the Interface Properties dialog box, click on Advanced.
- In the Advanced Interface Properties dialog box, select Override MTU and type the value in bytes. For ADSL, the MTU value is
1492or less. See the documentation for your ADSL modem.
- Click on OK twice.
The interface now uses the newly configured MTU.