authoritative;
subnet 191.168.1.0 netmask 255.255.255.0 {
    default-lease-time 86400; # 1 day
    ddns-update-style none;

    deny unknown-clients;
    # ignore unknown-clients; # this version may work better in class

    host classmate {
        hardware ethernet 00:02:6f:20:f2:c2;
        fixed-address 192.168.1.15;
    }
}