DHCP Prerequisite settings- Static IP Address for Server

Server name : Linux1.example.com
IP Address : 192.168.2.1
Default Gateway : 192.168.2.1
DNS Addresses: 192.168.2.1, 8.8.8.8
                                    

Install DHCP RPM package on Server CentOS 8/9

#yum install dhcp-server
                     
                                    

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Edit DHCP configuration file

#mv /etc/dhcp/dhcpd.conf /etc/dhcp/dhcpd.conf.bk
#cp /usr/share/doc/dhcp-server/dhcpd.conf.example
/etc/dhcp/dhcpd.conf
#vi /etc/dhcp/dhcpd.conf
# dhcpd.conf
#
# Sample configuration file for ISC dhcpd
#
# option definitions common to all supported
networks...
option domain-name "example.com";
option domain-name-servers 192.168.2.1, 8.8.8.8;
default-lease-time 600;
max-lease-time 7200;
# Use this to enble / disable dynamic dns updates
globally.
#ddns-update-style none;
# If this DHCP server is the official DHCP server
for the local
# network, the authoritative directive should be
uncommented.
authoritative;
# Use this to send dhcp log messages to a different
log file
# have to hack syslog.conf to complete the
redirection).
log-facility local7;
log-facility local7;
# No service will be given on this subnet, but
declaring it helps
# DHCP server to understand the network topology.
#subnet 10.152.187.0 netmask 255.255.255.0 {
#}
# This is a very basic subnet declaration.
subnet 192.168.2.0 netmask 255.255.255.0 {
range 192.168.2.101 192.168.2.120;
option routers 192.168.2.1; }


      

All remaining lines in this file will be commented using #

Start/Stop Service

#service dhcpd start
#chkconfig dhcpd on
#service dhcpd status

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If firewall is running

                                    
#firewall-cmd –add-service=dhcp –permanent
Success
#firewall-cmd --reload
Success
      

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View DHCP Lease database

#cat /var/lib/dhcpd/dhcpd.leases
      

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Client side settings

On LAN PC choose ..Network Adapter settings –Obtain IP Address automatically option.

Windows Clients like Windows 7/8/10/11

By using commands you can release IP address assigned by DHCP Server and renew it using ipconfig command.

                                    
Run – cmd – [Run cmd prompt – Run as Administrator]
C:\>ipconfig /release
C:\>ipconfig /renew
C:\>ipconfig/all
      

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