1.Install:

yum install dhcpd

Check if dhcpd was installed in system:

dhcpd --version

Allow dhcpd start with system startup

systemctl enable dhcpd

Directory structure of dhcpd:

  • /etc/dhcp/dhcpd.conf: The file config of dhcpd.
  • /var/lib/dhcpd/dhcpd.lease: The file contains information about dynamic IPs being granted via DHCP.
  • /var/log/message: The default log file of 4 way DHCP.

    2.Config DHCP Service:

    First, you can copy the existing sample configuration file to use for configuring the DHCP service.

    cp -f /usr/share/doc/dhcp-*/dhcpd.conf.example /etc/dhcp/dhcpd.conf

    vi /etc/dhcp/dhcpd.conf

    Configuration file content simple: ``` default-lease-time 600; max-lease-time 7200; lease-file-name “/var/lib/dhcpd/dhcpd.leases”; authoritative; log-facility local7;

subnet 192.168.1.0 netmask 255.255.255.0 { range 192.168.1.100 192.168.1.200; default-lease-time 3600; max-lease-time 7200; option subnet-mask 255.255.255.0; option routers 192.168.1.1; option broadcast-address 192.168.1.255; option domain-name-servers 8.8.8.8; }

## 3.Start DHCP and set rule firewall

systemctl start dhcpd

show status of dhcpd:

systemctl status dhcpd

Open port 67 UDP:

iptables -A INPUT -p udp -m state –state NEW –dport 67 -j ACCEPT

If you use another firewall service you should research the way to open port 67 UDP in your system.  
Check if there is a DHCPD service that has been listened to socket port 67 udp.

netstat -ulnp | grep 67 ```