[Settings]
ConfigureUnknownClients=1  ; Default: 1

ConfigureUnknownClients is available since V1.7. Setting this to 1 tells the DHCP server to automatically configure unknown clients. Since this is the default, there is no change to previous versions. If ConfigureUnknownClients is set to 0, then a client is assigned an IP address only if the client is already specified in the INI file. Note: Important difference to IgnoreUnknownClients. IgnoreUnknownClients only controls how the DHCP Server behaves when no IP address is assigned (declining request or keep quiet). What makes a client a “known client” is an existing entry in the INI file such as:

[00-01-02-03-04-05] ; mac address
AutoConfig=1

or

[00-01-02-03-04-??] ; mac address with wildcards
AutoConfig=1

or

[client-identifier] ; client identifier (option 61)
AutoConfig=1