Configuring DHCP Server in RHEL7/ Cent OS 7

DHCP – Dynamic host configuration protocol

We are going to configure DHCP Server in RHEL7

It’s a network protocol used to assign IP’s to the client dynamically over the network.

DHCP Workflow:

Required Package installation:

#yum install dhcp

Now we should assign a insterface in DHCPDARGS in /etc/sysconfig/dhcpd

 [[email protected] ~]# vi /etc/sysconfig/dhcpd
 
  DHCPDARGS=enp0s3

After installing package it will create one empty configuration file /etc/dhcp/dhcpd.conf  and we have one sample configuration file under /usr/share/doc/dhcp-4.2.15/dhcpd.conf.exmaple.

So as first, append the content from example file to original file using cat command.

[[email protected] ~]# cat /usr/share/doc/dhcp-4.2.5/dhcpd.conf.example >> /etc/dhcp/dhcpd.conf

Open the configuration file to configure DHCP Server:

First will give basic configuration which will be common for your network.

[[email protected] ~]# vi /etc/dhcp/dhcpd.conf


Make the below entries 

 option domain-name "lbcdomain.com";
 option domain-name-servers server.lbcdomain.com;
 default-lease-time 600;
 max-lease-time 7200;
 authoritative;
 log-facility local7;



Now make subnet details in same configuration file.

subnet 192.168.1.0 netmask 255.255.255.0 {
 option routers 192.168.1.254;
 option subnet-mask 255.255.255.0;
 option domain-search "lbcdomain.com";
 option domain-name-servers 192.168.1.1;
 option time-offset -18000; # Eastern Standard Time
 range 192.168.1.10 192.168.1.100;
}

Optional(To reserve IP for a dhcp client machine) :

If you wan to assign a static IP to a client using DHCP service, use the below command.

host station1 {
 option host-name "node11.lbcdomain.com";
 hardware ethernet 00:12:2A:2B:3C:AB;
 fixed-address 192.168.1.100;
}

Restart the dhcp service now to complete the DHCP server configuration.

[[email protected] ~]# systemctl restart dhcp
To check dhcp we should login in client machine which is in same network physically and edit the interface configuration file to make dhcp ip assigned.
#vi /etc/sysconfig/network-scripts/ifcfg-eth0
 change the entry for BOOTPROTO as dhcp

DEVICE=eth0

BOOTPROTO=dhcp

TYPE=Ethernet

ONBOOT=yes
 
Save and quit.
 
Now restart the network service.
 #service network restart
 
now check for the ip and it should be assigned in between 192. 168.1.50 to 192.168.1.254
  
DHCP Configuration has been done.
Do practice well. All the best.

12 thoughts on “Configuring DHCP Server in RHEL7/ Cent OS 7”

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