Where to find information on DHCP

DHCP Mini-howto

DHCP Defined

How To Install DHCP

How to install a DHCP Server

% mount /dev/cdrom

% cd /mnt/cdrom/RedHat/RPMS

% rpm -ivh dhcp*.rpm

How to install a DHCP Client

% mount /dev/cdrom

% cd /mnt/cdrom/RedHat/RPMS

% rpm -ivh pump*.rpm

How To Configure DHCP

How to configure a DHCP server

% route add -host 255.255.255.255 dev eth0

Configure your /etc/dhcpd.conf file

Here is an example configuration. Theis configuration will give out IP addessesfrom 10.0.0.10-10.0.0.100 or 10.0.0.150-10.0.0.200. If the client doesn't ask for a specific time frame, it will lease the ip address for 600 seconds. If the client asks for a time frame, the maximum it will allow is 7200 seconds. It also sets up the default gateway of 10.0.0.1, the subnet mask of 255.255.255.0, the broadcast address of 10.0.0.255, and 10.0.0.2, and 10.0.0.3 as DNS servers.

# Sample /etc/dhcpd.conf
# (add your comments here)
default-lease-time 600;
max-lease-time 7200;
option subnet-mask 255.255.255.0;
option broadcast-address 10.0.0.255;
option routers 10.0.0.1;
option domain-name-servers 10.0.0.2, 10.0.0.3;
option domain-name "mydomain.org";
subnet 10.0.0.0 netmask 255.255.255.0 {
range 10.0.0.10 10.0.0.100;
range 10.0.0.150 10.0.0.200;
}

Make sure there is a dhcpd.leases file:

% touch /var/state/dhcpd/dhcpd.leases

Run dhcpd in debugging mode to ensure it is working properly:

% /usr/sbin/dhcpd -d -f

How To Configure a DHCP client

Run the netcfg command

% netcfg Under Interfaces, edit the appropriate entry for your ethernet card choosing dhcp as the protocol. Also make sure you enable the "Activate interface at boot time option". Then click "Save" and the "Done". This should immeadiately activate your changes. However, if it does not, then you can force the changes to take affect by doing:

% /sbin/ifup eth0

Note: You can manually run /sbin/dhcpcd in order to get an ip address via dhcp for a particular interface. For example, (from Steve's RHCE Study Guide)

/sbin/dhcpcd -n -H eth0

    -H = Force dhcpcd to set the hostname of the host to the hostname option
         supplied by the DHCP server.
    -n = If dhcpcd is already running send it an ALRM signal to cause it to
         attempt to renew it's lease.
  eth0 = Interface to configure

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