root@infra1:/etc/dhcp# cat dhcpd.conf
# dhcpd.conf


# option definitions common to all supported networks...
option domain-name "lab.test";

# option domain-name-servers ns1.example.org, ns2.example.org;
option domain-name-servers infra1.lab.test;

# For dynamic updates
ddns-updates            on;
ddns-update-style       interim;
ignore                  client-updates;
update-static-leases    on;
authoritative;

default-lease-time 600;
max-lease-time 7200;

# The ddns-updates-style parameter controls whether or not the server will
# attempt to do a DNS update when a lease is confirmed. We default to the
# behavior of the version 2 packages ('none', since DHCP v2 didn't
# have support for DDNS.)
ddns-update-style none;

# If this DHCP server is the official DHCP server for the local
# network, the authoritative directive should be uncommented.
authoritative;

# Use this to send dhcp log messages to a different log file (you also
# have to hack syslog.conf to complete the redirection).
#log-facility local7;
#
include                 "/etc/dhcp/ddns-keyfile.key";

zone lab.test. {
        primary 127.0.0.1;
        key ddns-key;
}

zone 10.10.10.in-addr.arpa. {
        primary 127.0.0.1;
        key ddns-key;
}

# A slightly different configuration for an internal subnet.
subnet 10.10.10.0 netmask 255.255.255.0 {
        range 10.10.10.100 10.10.10.200;
        option domain-name-servers infra1.lab.test;
        option domain-name "lab.test";
        option routers 10.10.10.1;
        option broadcast-address 10.10.10.255;
        default-lease-time 600;
        max-lease-time 7200;
}

host testhost {
        hardware ethernet xx:xx:xx:xx:xx:xx;
        fixed-address 10.10.10.25;
}