DHCP

DYNAMIC HOST CONFIGURATION

1. Dynamic Host Configuration Protocol.

 

2. It is used to assign the automatic IP Address.

 

3. When DHCP provides the IP Address, that process is called the DORA process.

 

4. DORA stands for Discover Offers Reverse Acknowledgement.

 

5. For configuration, “dhcpd” file is used in Linux

               POOL: poolname

                              192.168.0.2

                              192.168.0.3

                              192.168.0.4

                              192.168.0.5

 

6. If we want to assign a particular IP to a particular device then we can do it via RESERVATION concept in DHCP.

 

7. Whoever is having a strong health get the first IP from pool and other devices getting IPs from same range.

 

8. If device is restarted and getting IP afterwards then it might obtain other range IP.

 

 

INSTALLATION & CONFIGURATION

1. rpm -qa | grep dhcp

 

2. vim /etc/dhcp/dhcpd.conf

     (Initially, this file is empty.)

 

3. Copy content from sample file.

               cp /usr/share/doc/dhcp*/dhcpd.conf.sample /etc/dhcp/dhcpd.conf

 

4. Edit Configuration file.

               vim /etc/dhcp/dhcpd.conf

                              subnet <NETWORK-RANGE>

                              range <STARTING IP> <ENDING IP>

 

5. Start the service.

               chkconfig dhcpd on

               service dhcpd start

               service dhcpd status

 

6. Test the server.

               a. In Linux:

                              - Change Network Configuration

                              - Set Automatic DHCP (check with ‘setup’ command)

               b. In Windows:

                              ipconfig /release

                              ipconfig /renew

 

 

IP RESERVATION

1. Make changes in Configuration File.

               vim /etc/dhcp/dhcpd.conf

                              Hardware ethernet “<MAC ADDRESS>”

                              Fixed Address “<IP-FROM-DHCP-POOL>”

 

2. Restart Service.

               service dhcpd restart