192.168.1.0/24なら以下のようにする
ddns-update-style interim; ignore client-updates; subnet 192.168.1.0 netmask 255.255.255.0 { # --- default gateway option routers 192.168.1.1; option subnet-mask 255.255.255.0; option domain-name "domain.org"; option domain-name-servers 192.168.1.78; option time-offset -18000; # Eastern Standard Time range dynamic-bootp 192.168.1.128 192.168.1.254; default-lease-time 21600; max-lease-time 43200; }
dhcpd -f -d