Administrator's Guide - Kerio Software Archive

Configuration of network services
The DHCP server can be enabled/disabled using the DHCP Server enabled option (at the top).
Configuration can be modified even when the DHCP server is disabled.
Automatic configuration of IP scopes
By default, the DHCP server works in the mode of automatic configuration of IP scopes. In this
mode, Kerio Control detects parameters of network interfaces included in group Trusted /Local
and uses them to generate and update IP scopes for the corresponding subnets. Whenever an
interface is changed in group Trusted /Local, the DHCP server’s configuration will be updated
automatically.
For each interface’s subnet, a scope of the following parameters will be created:
• Range — by IP address of the interface and the corresponding subnet mask.
The range should cover the particular subnet with free resources for assigned static
addresses (e.g. for mask 255.255.255.0, the range from x.x.x.11 to x.x.x.254
will be created). If an interface’s address is covered by a range, then an exception is
automatically defined for it.
• Subnet mask — according to the particular interface.
• Default gateway — IP address of the particular interface.
• DNS server — IP address of the particular interface.
Some other parameters that are available at the interface can also be set (DNS domain,
WINS server address). This depends on the firewall’s operating system as well as on the
configuration of the particular interface.
Warning:
In case of automatic configuration, it is recommended to administer the DHCP server only
via the Kerio Control Administration web interface (see chapter 3.1). Administration Console
allows only manual configuration and it therefore switches to the manual mode any time
any changes are to be made (without any indication).
Manual Definition of Scopes and Reservations
If you do not want to use the automatic configuration of IP scopes, go to Kerio Control Administration
and switch to the manual configuration mode or perform the settings in Administration
Console where only manual configuration is available and the mode is switched automatically
upon changes saving. However, bear in mind that changes of interfaces in group Trusted /Local
(e.g. adding of a new interface, change of IP address, etc.) require manual update of address
scopes defined in the DHCP server!
The following description focuses on Administration Console.
The Scopes section includes two parts — in one address scopes and in the other leases and
reservations are defined:
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