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    Friday, August 10, 2012

    How to configure DHCP server in Linux

    Dynamic Host Configuration protocol (DHCP)This server is very useful if you are running a company with multiple clients where it becomes hard to manually assign the IP address manually so you redirect the client to take the IP from the server which is done using a DHCP server.

    Prerequisites:
    Make sure the required packge is installed in the machine.
    # rpm -qa | grep dhcp
    dhcp-4.1.1-31.P1.el6.i686
    dhcp-common-4.1.1-31.P1.el6.i686

    If the packages are not installed then follow these command for installation and configuration of the same
    # yum -y install dhcp
    Once the package is installed
    # cd /etc/dhcp/
    # vi dhcpd.conf
    option domain-name "example.com";
    option domain-name-servers server.example.com;
    default-lease-time 600;
    max-lease-time 7200;
    authoritative;

    subnet 10.10.10.0 netmask 255.255.255.0 {
    range dynamic-bootp 10.10.10.220 10.10.10.230;
    option broadcast-address 10.10.10.255;
    option routers 10.10.10.235;

    (Use these lines if you want to assign a fix IP to a particular client, mention client's IP with his/her MAC Address)

    host ns {
    hardware ethernet 08:00:07:26:c0:a5;
    fixed-address 10.10.10.223;
    }
    }

    Just save and restart your dhcp server services
    # service dhcpd restart
    Go to the client machine and make the following changes in ifcfg-eth0 file
    # vi /etc/sysconfig/network-scripts/ifcfg-eth0
    DEVICE=eth0
    HWADDR=00:0c:29:6d:55:dd
    NM_CONTROLLED=no
    ONBOOT=yes
    USERCTL=yes
    TYPE=Ethernet
    BOOTPROTO=dhcp
    IPV6INIT=no

    Restart your network services
    # service network restart
    and check the new IP of the your client machine
    # ifconfig
     eth0      Link encap:Ethernet  HWaddr 00:0C:29:6D:55:DD
              inet addr:10.10.10.221  Bcast:10.10.10.255  Mask:255.255.255.0
              inet6 addr: fe80::20c:29ff:fe6d:55dd/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:19730475 errors:81 dropped:12 overruns:0 frame:0
              TX packets:6731135 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000
              RX bytes:2544186474 (2.3 GiB)  TX bytes:2956734996 (2.7 GiB)
              Interrupt:18 Base address:0x2000
    As you can see the new IP assigned to this machine as assigned by my DHCP server

    If you face any issues in doing the same kindly leave back your comments with the error.

    Follow the below links for more tutorials:

    Configure Red Hat Cluster using VMware, Quorum Disk, GFS2, Openfiler
    Tutorial for Monitoring Tools SAR and KSAR with examples in Linux
    How to configure Samba 4 Secondary Domain Controller
    How to secure Apache web server in Linux using password (.htaccess)
    How to register Red Hat Linux with RHN (Red Hat Network )
    Red hat Enterprise Linux 5.5 Installation Guide (Screenshots)
    15 tips to enhance security of your Linux machine
    Why is Linux more secure than windows and any other OS
    What is the difference between "su" and "su -" in Linux?
    What is kernel-PAE in Linux?
    What is swappiness and how do we change its value?
    How to log iptables messages in different log file
    What are the s and k scripts in the etc rcx.d directories
    How to check all the currently running services in Linux
    How to auto start service after reboot in Linux
    What is virtual memory, paging and swap space?


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