DHCP - SERVER (Dynamic Host Configuration Protocol )

                                                      DHCP SERVER

DHCP -  Dynamic Host Configuration Protocol

Port No. -  67,68

package  - dhcpd

deamon  - dhcpd

role     -   provides  the dynamic ip add. to all the LAN.  P.C,
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( Note : - Before configure the 'DHCP' Server set the static IP in the system  on which we are going to  configure DHCP server )

   #vim    /etc/sysconfig/network-script/ifcfg-eth0

      BOOTPROTO = static

      IPADDR  =  192.168.0.1

      NETMASK =  255.255.255.0

      :wq   [ after this conf. save the file and quit ]
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step 1.    Install the package  'dhcpd'

              #yum    install  dhcpd

             (copy the the conf. file from /user/share/doc/dhc-4.1.1/dhcpd.conf.sample  to                                              /etc/dhcpd/dhcpd.conf )

step 2.      #cp     /usr/shar/doc/dhcp-4.1.1/dhcp.conf.sample       /etc/dhcp/dhcpd.conf

             overwrite ?  yes  

            [  Nonte:-  This particular subnet declaration specifies a default lease time of 600 seconds (10 min)  and a maximum lease time of 7200 seconds (two hours ). Other common values would be 86400 (one day )  ,  604800 (one week ) ,  and 2592000 (30 day ).


step 3.   #vim    /etc/dhcp/dhcpd.conf


           #this is very basic subnet declaration.

         sbunet  192.168.0.0   netmask   255.255.255.0 {

          range   192.168.0.2     192.168.1.50 ;
          }

         :wq   [ save the file and quit after this configuration )

          #service    dhcpd      restart
          
step 4.    # vim   /var/lib/dhcpd/dhcpd.leases          [ go in to this  file and delete  all the content  ]      

              :wq   [ delete all and save the file ]

              # vim  /var/lib/dhcpd/dhcpd.leases~        [ again go in to this file and delete all ]

               :wq    [ delete all and save the file ]

step 5.    [ Note:- if want to fix the IP of any system than go to the file '/etc/dhcp/dhcpd.conf' and put the
MAC Add. and of  that system and fix the IP

              #vim      /etc/dhcp/dhcpd.conf

              host  fantasia     [ find this line in conf. file of dhcp ]

              hardware ethernet          00:0c:f1:80:3a:67 ;

              fixed  - address    192.168.0.5

              :wq    [ after fixed the IP save this file and quit ]

              #service    dhcpd    restart

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