In your dhcpd.conf, inside the "subnet" section for the subnet that you want to use these values, turn on these options:

Code:
    option routers $YOUR_IP;
    option broadcast-address $SUBNET_BCAST;
    option domain-name $YOUR_DOMAIN;
    option domain-name-servers $DNS_SERVER_IP;
You have to replace the $ variables yourself, though (dhcpd isn't smart enough to do that). $YOUR_DOMAIN is whatever you want your client DHCP daemon to put into /etc/resolv.conf as a "search" directive. $YOUR_IP is the gateway address. $DNS_SERVER_IP is what the client should put into resolv.conf as a "nameserver" directive. And $SUBNET_BCAST is the broadcast address for your subnet (you probably already have that set up).