CentOS

server config

/etc/dhcp/dhcpd.conf

subnet 192.168.2.0 netmask 255.255.255.0 {
        option routers          192.168.2.1;
        option subnet-mask      255.255.255.0;
        option domain-name-servers 192.168.1.3,202.106.0.20;
        next-server     192.168.1.3;
        filename        "pxelinux.0";
        range dynamic-bootp 192.168.2.30 192.168.2.170;
        option time-offset      -18000; # Eastern Standard Time
        option time-servers 192.168.1.3;
        default-lease-time 86400;
        max-lease-time 86400;

}