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DHCP. -Ameeta and Haripriya -cmsc 691x. DHCP. Dynamic Host Configuration Protocol It controls vital networking parameters of hosts with the help of the server Its an extension of BOOTP Its backward compatible with BOOTP

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-Ameeta and Haripriya

-cmsc 691x



  • Dynamic Host Configuration Protocol

  • It controls vital networking parameters of hosts with the help of the server

  • Its an extension of BOOTP

  • Its backward compatible with BOOTP

    • existing BOOTP devices can communicate with DHCP servers and allow the DHCP requests to cross routers running BOOTP forwarders

    • Upgrading is easy

Dhcp client setup


  • Download dhcpcd from one of the following sites

    • ftp://metalab.unc.edu/pub/Linux/system/network/daemons

    • ftp://ftp.phystech.com/pub/

  • Unpack it

    • Tar –zvxf dhcpd-1.3.18pl1.tar.gz

  • Cd into the directory and make dhcpcd

    • Cd dhcpcd-1.3.18pl1

    • Make

  • Install it

    • Make install

Dhcp client setup1


  • /etc/dhcpc will be created .

  • DHCPcd will store the DHCP information.

  • dhcpcd will be copied into /usr/sbin

  • To make system initialize during DHCP during boot type

    cd /etc/rc.d

  • Then do “mv rc.inet1 rc.inet1.OLD”

  • This moves old network initialization script into “rc.inet1.OLD”

  • Create the new rc.inet1 script.

  • Save it and reboot the computer.

Sample code in rc net

Sample code in rc.net

  • #!/bin/sh

  • #

  • # rc.inet1 This shell script boots up the base INET system.

  • HOSTNAME=`cat /etc/HOSTNAME`

  • #This is probably not necessary but I will leave it in anyways

  • # Attach the loopback device.

  • /sbin/ifconfig lo /sbin/route add -net netmask lo # IF YOU HAVE AN ETHERNET CONNECTION, use these lines below to configure the # eth0 interface. If you're only using loopback or SLIP, don't include the # rest of the lines in this file

  • . /usr/sbin/dhcpcd

Dhcp client setup2


  • After machine reboots the network interface should be configured.

  • Type ifconfig

  • If we have some normal no under inet addr that means we are set.

  • One final thing is we need to specify our nameservers.

  • Two ways to do it:

  • Ask the provider for the address of the nameserver and then put those in “/etc/resolv. conf”

  • Or DHCPcd will obtain the list from DHCP server and will build resolv.conf in “/etc/dhcpc”.

Dhcp client setup3


  • Make a link from “/etc/dhcpc/resolv.conf” to “/etc/resolv.conf by using:

    ln –s /etc/dhcpc/resolv.conf /etc/resolv.con

  • This was all about setting up the client for DHCP.

Dhcp server setup

DHCP Server Setup

  • Download the DHCP server from ftp://ftp.isc.org/isc/dhcp/.

  • Unpack it .

  • cd into the distribution directory and type “./configure”.

  • Type “make”

  • Type “make install”.

  • After installing type “ifconfig –a”.

  • If the resulting output does not say MULTICAST then we must reconfigure the kernel and add multicast support.

Dhcp server setup1

DHCP Server Setup

  • Add route for

  • Type “route add –host dev eth0”

  • If we get a message “ : Unknown host”

  • In /etc/hosts files add “ all-ones”.

  • Then do,” route add –host all-ones dev eth0”

  • Eth0 is the name of the network device you use.

  • If it differs change appropriately.

Dhcp server setup2

DHCP Server Setup

  • To configure DHCPd create or edit “/etc/dhcpd.conf”.

  • There is a graphical interface for dhcpd configuration under KDE called “kcmdhcpd” .

  • It is very similar to DHCP configurator on Windows NT.

  • To configure by hand instructions are discussed below.

  • To assign IP addresses randomly the settings in /etc/dhcpd.conf will be as shown.

  • A sample /etc/dhcpd.conf will contain:

Dhcp server setup3

DHCP Server Setup.

  • #sample /etc/dhcpd.conf

  • default-lease-time 600;

  • max-lease-time 7200;

  • option subnet-mask;

  • option broadcast-address;

  • option routers;

  • option domain-name-servers,;

  • option domain name “mydomain.org”;

  • subnet netmask {

  • range;

  • range;

  • }

Dhcp server setup4

DHCP Server Setup

  • We can also assign specific IP addresses based on the client’s ethernet address.

  • Eg. host haagen {

  • hardware ethernet 08:00:2b:4c:59:23;

  • fixed-address;

  • }

  • This will assign IP address to a client with the ethernet address mentioned above.

  • Create the dhcpd.leases file which has information about current leases.

Dhcp server setup5

DHCP Server Setup

  • Do “touch /var/state/dhcp/dhcpd.leases” to create empty dhcpd.leases file.

  • Invoke the DHCP server by typing “/usr/sbin/dhcpd”

  • This will invoke dhcpd on etho device.

  • To verify everything is working fine :

  • Turn on the debugging mode

  • Put the server in foreground.

  • “/usr/sbin/dhcpd –d –f “

  • Then boot one of the clients and check out console of server.

Dhcp server setup6

DHCP Server Setup

  • We would see no of debugging messages coming up.

  • If everything is fine then the setup is done.

  • You can quit dhcpd.

  • If we want dhcpd to start at boot-up include dhcpd in “/etc/rc.d/rc.local”.

  • Now we are done with DHCP Server Setup.

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