Teste isso:
# server-identifier 192.168.1.2;
ddns-update-style interim;
ignore client-updates;
authoritative;
default-lease-time 900;
max-lease-time 7200;
option ip-forwarding off;
option domain-name "mydomain.example";
option ntp-servers 0.pool.ntp.org, 1.pool.ntp.org, 2.pool.ntp.org, 3.pool.ntp.org;
shared-network mydomain {
subnet 192.168.1.0 netmask 255.255.255.0 {
option routers 192.168.1.254;
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.1.255;
option domain-name-servers 192.168.1.2;
option netbios-name-servers 192.168.1.2;
range 192.168.1.10 192.168.1.100;
range 192.168.1.150 192.168.1.200;
}
}