CentOS 7: Setup a DHCP server and provide specific IP based on MAC address
Step 1: Install DHCP service
We installed the Dynamic host configuration protocol software (DHCP service) using the command:
yum install dhcp;
The dhcp package provides the ISC DHCP service and relay agent.
Step 2: Configure the DHCP service
Afterwards, we created the file /etc/dhcp/dhcpd.conf using the following content:
subnet 192.168.0.0 netmask 255.255.255.0 {
option routers 192.168.0.254;
option subnet-mask 255.255.255.0;
option domain-name "bytefreaks.net";
option domain-name-servers 192.168.0.1;
option time-offset -18000; # Eastern Standard Time
range 192.168.0.90 192.168.0.99;
}
host coolServer {
hardware ethernet 0e:e0:4b:b4:28:82;
fixed-address 192.168.0.80;
}
This configuration allowed us to provide a DHCP service to the network for the subdomain 192.168.0.x with the range [90,99].
Also, we statically defined the IP for our coolServer using a filter based on the MAC address of the machine.
If you do not want to provide any range, only static IPs, then comment out (#) the line that starts with the word range .
Step 3: Start DHCP service
systemctl start dhcpd.service;
Step 4: Check the status of DHCP service
systemctl status dhcpd.service;
It is a good idea to verify that there are no errors, so be sure to check the status of the service.
You can ignore the error that says “you did not define a subnet declaration for all devices” if you do not really need to do it.
Step 5: Permanently enable the DHCP service
systemctl enable dhcpd.service;
Additional:
Disable the DHCP service
systemctl disable dhcpd.service;
Stop the DHCP service
systemctl stop dhcpd.service;
