dhcp server configuration in linux step by step.

Dynamic Host Configuration Protocol

DHCP dynamically assigns Network Information to client systems.

It maintains all Network Information centralized, like IP-address, Subnet mask, Router-IP, Domain Information etc.

Authorized DHCP Server:

Act as a Authorized DHCP Servers, so it can avoid illegal DHCP Servers on the same network.

DHCP Scope:

Pool of IP addresses for client systems.


DHCP- DORA Process: 

D=Discover: In a process the client machine sends broadcast message for discover the DHCP Server.

O=offer:  The DHCP server offers a pool of IP-address to clients.

R=Request: The client machine request for an IP-address to DHCP Server.

A=Acknowledgment: Finally DHCP accepts and gives acknowledgment to client with IP-address.

  
Packages :   dhcp

Script         : /etc/dhcpd.conf

Services and Demon : dhcpd

Port number : 68 

Configuration of DHCP SERVER 

Step 1 : CHECK & INSTALL THE PACKAGES 

[root@dhcpserver ~]# rpm -qa  dhcp-* 
or 
[root@dhcpserver ~]# yum list installed  dhcp-* 
[root@dhcpserver ~]# yum remove dhcp-* -y 

Step 2)Now Install the packages 
[root@dhcpserver ~]# yum  install dhcp-* -y 
Step 3) Edit Main Configuration File 
[root@dhcpserver ~]# vi /etc/squid/squid.conf 

4  subnet 192.168.0.0 netmask 255.255.255.0 { # Network ID
7  option routers 192.168.0.254; # GateWay orRouter IP
8  option subnet-mask 255.255.255.0;
10 option nis-domain "zoom.com"; # NIS DOMAIN
11 option domain-name "zoom.com"; # DNS DOMAIN
12 option domain-name-servers 192.168.0.1; # DNS IP
21 range dynamic-bootp 192.168.0.150 192.168.0.170; # Pool of IP
31 host nfs { # reservation ofIP
32 option host-name "nfs.zoom.com"; # OR
33 hardware ethernet aa:ab:56:78:AB:CD; # Mac binding
34 fixed-address 192.168.0.10;
35 }
36 host smb {
37 option host-name "smb.zoom.com";
38 hardware ethernet ad:ab:56:78:AB:CD;
39 fixed-address 192.168.0.15;
40 }
41 } 

:wq 
Step 4 ) START THE SERVICES 
[root@dhcpserver ~]# service dhcpd restart 

CLIENT SIDE CONFIGURATION

Step 1) Select the Dhcp in netconfig command

[root@client ~]# netconfig

Step 2) START THE SERVICES

[root@client ~]# service network restart

Step 3 ) Now Check wheather all the Entries are comming

[root@client ~]# ifconfig 

[root@client ~]# route -nv

[root@client ~]# cat /etc/resolv.conf [root@client ~]# nisdomainname

# to now IP

# to check GateWay 

# to check DNS  entries 

# to check NisDomainName

[root@client ~]# hostname 

NOTE : Host name will not come the /etc/sysconfig/network file should have following entries ONLY 

[root@client ~]# vi /etc/sysconfig/network NETWORKING=yes 

:wq! 

Reboot the machine and check the entries