Linux Tips and Tricks

aptitude install dhcp3-server
 # this will probably install and fail to start. That's fine, we don't have configs yet

vi /etc/dhcp3/dhcpd.conf
 # set the below to your preferred internal (or external) domain name
option domain-name "example.com";
 # set this to whatever DNS you want the DHCP server to push to the clients
 # as we will setup dns in next step it is wise to set it to this server
option domain-name-servers 192.168.0.1;
 # uncomment the following line
authoritative;
 # declare the subnet, put this at the very bottom of the file
 # you can change the range of the dhcp below as well
subnet 192.168.0.0 netmask 255.255.255.0 {
  range 192.168.0.50 192.168.0.200;
  option domain-name-servers 192.168.0.1;
  option domain-name "internal.example.com";
  option routers 192.168.0.1;
  option broadcast-address 192.168.0.255;
  default-lease-time 600;
  max-lease-time 7200;
}
 # that's about it in the configuration file for basic DHCP setup
 # if you want to do some advanced stuff, the dhcp3.conf file contains
 # a huge load of commented out examples you can use, so feel free
 # to experiment should you wish to

 # now save the file, exit it

vi /etc/default/dhcp3-server
 # change the INTERFACES line to point at your internal interface
INTERFACES="eth1"

 # save the file and exit it

 # perform the below in order to restart the dhcp configuration
/etc/init.d/dhcp3-server restart

 # note if you get an error telling you to check syslog, do this:
tail -100 /var/log/syslog |grep dhcpd
 # if you receive an error saying "Not configured to listen on any interfaces"
 # you should make sure INTERFACES is set and that you don't have any typos
 # in the /etc/dhcp3/dhcpd.conf file in the subnet declaration