DHCP Server Configuration
Step-1: To check dhcp rpm package is installed or not by following this command:
(if installed then it will show dhcp packages)
[root@dhcp ~]# rpm -qa | grep –i dhcp* or
[root@dhcp ~]# rpm –qa dhcp*
dhcp-3.0.5-21.el5
dhcp-devel-3.0.5-21.el5
libdhcp-devel-1.20-10.el5
dhcpv6-client-1.0.10-17.el5
libdhcp-1.20-10.el5
libdhcp4client-3.0.5-21.el5
libdhcp6client-devel-1.0.10-17.el5
libdhcp4client-devel-3.0.5-21.el5
dhclient-3.0.5-21.el5
If not installed, then installed the packages using Yum command:
[root@dhcp ~]# Yum Install dhcp* lib*
Step-2: Check and Configure the Network Card:
[root@dhcp ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth0
(Original File):
#Broadcom Corporation Net link BCM57875 Gigabyte Ethernet PCI Express
DEVICE=eth0
BOOTPROTO=dhcp
HWADDR=00:0C:29: EB: B2: CA
ONBOOT=yes
BOOTPROTO=dhcp
HWADDR=00:0C:29: EB: B2: CA
ONBOOT=yes
(Modified File):
#Broadcom Corporation Net link BCM57875 Gigabyte Ethernet PCI Express
DEVICE=eth0
BOOTPROTO=static
HWADDR=00:0C:29: EB: B2: CA
ONBOOT=yes
TYPE=Ethernet
PEERDNS=no
USERCTL=no
IPV6INIT=no
IPADDR=210.207.201.4
NETMASK=255.255.255.0
NETWORK=210.207.201.0
BROADCAST=210.207.201.255
Press Esc → Shift + : → x! → Enter (For Save and Exit the Vi Editor).
After changing you have to reload/restart the NIC(eth0) card by following command:
[root@dhcp ~]# ifdown eth0
[root@dhcp ~]# ifup eth0
[root@dhcp ~]# service network restart
Step-3: After complete the NIC configure you have to change the host name by following this command:
[root@dhcp ~]# vi /etc/sysconfig/network
(Original File):
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=localhost.localdomain
(Modified File):
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=dhcp
Press Esc → Shift + : → x! → Enter
Step-3: Edit the resolv.conf file by following this command
[root@dhcp ~]# vi /etc/resolv.conf
search alphabd.net
nameserver 210.207.201.1
nameserver 210.207.201.2
Step-4: Copy & Rename the DHCP configuration file & Change the permission by following this command:
[root@dhcp ~]# cd /usr/share/doc/dhcp-3.0.5/
[root@dhcp dhcp-3.0.5]# cp dhcpd.conf.sample /etc/dhcpd.conf
[root@dhcp dhcp-3.0.5]# chmod 777 /etc/dhcpd.conf
Now Edit this file using vi editor & make some change in to this file.
[root@dhcp ~]# vi /etc/dhcpd.conf
(Original File):
ddns-update-style interim;
ignore client-updates;
subnet 192.168.0.0 netmask 255.255.255.0 {
# --- default gateway
option routers 192.168.0.1;
option subnet-mask 255.255.255.0;
option nis-domain "domain.org";
option domain-name "domain.org";
option domain-name-servers 192.168.1.1;
option time-offset -18000; # Eastern Standard Time
# option ntp-servers 192.168.1.1;
# option netbios-name-servers 192.168.1.1;
# --- Selects point-to-point node (default is hybrid). Don't change this unless
# -- you understand Netbios very well
# option netbios-node-type 2;
range dynamic-bootp 192.168.0.128 192.168.0.254;
default-lease-time 21600;
max-lease-time 43200;
# we want the nameserver to appear at a fixed address
host ns {
next-server marvin.redhat.com;
hardware ethernet 12:34:56:78:AB:CD;
fixed-address 207.175.42.254;
}
}
(Modified File):
ddns-update-style interim;
ignore client-updates;
subnet 210.207.201.0 netmask 255.255.255.0 {
# --- default gateway
option routers 210.207.201.4;
option subnet-mask 255.255.255.0;
# option nis-domain "domain.org";
option domain-name "alphabd.net";
option domain-name-servers 210.207.201.1;
option time-offset -18000; # Eastern Standard Time
# option ntp-servers 192.168.1.1;
# option netbios-name-servers 192.168.1.1;
# --- Selects point-to-point node (default is hybrid). Don't change this unless
# -- you understand Netbios very well
# option netbios-node-type 2;
range dynamic-bootp 210.207.201.50 210.207.201.254;
default-lease-time 43200;
max-lease-time 86400;
# we want the nameserver to appear at a fixed address
host ns {
next-server marvin.redhat.com;
hardware ethernet 12:34:56:78:AB:CD;
fixed-address 207.175.42.254;
}
host pc01 {
hardware ethernet 00:1E:68:91:BB:EC;
fixed-address 210.207.201.100;
}
host client01 {
hardware ethernet 00:0C:29:8C:95:01;
fixed-address 210.207.201.150;
}
}
Esc → Shift + : → x! → Enter
Step-5: Create a dhcp.leases file that the DHCP server grants to the DHCP client to use a particular IP address. If it does not exist dhcp server will fail to provide IP address for dhcp cient.
[root@dhcp ~]# touch /var/lib/dhcpd/dhcpd.leases
[root@dhcp ~]# service network restart
[root@dhcp ~]# service dhcpd restart
Step-6: Client Configuration for using DHCP.
Linux Client
[root@dhcp ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth0
#Broadcom Corporation Net link BCM57875 Gigabyte Ethernet PCI Express
DEVICE=eth0
BOOTPROTO=dhcp
HWADDR=00:0C:29: EB: B2: CA
ONBOOT=yes
BOOTPROTO=dhcp
HWADDR=00:0C:29: EB: B2: CA
ONBOOT=yes
TYPE=Ethernet
Windows Client
From NIC Properties =>> set Obtain an IP Address Automatically
Step-7: Renewing IP Address
Renew an IP Address in Linux
The -r flag explicitly releases the current lease, and once the lease has been released, the client exits. For example, open terminal and type the command:
[root@dhcp ~]#
dhclient –r Now obtain fresh IP:
[root@client1 ~]#
dhclientOr you can put the two commands on a single line:
[rnbsp; oot@client1 ~]#
dhclient -r; dhclientThere is no need to restart network service. Above command should work with any Linux distro such as RHEL, Fedora, and others. On a related note you can also try out the following commands:
[root@client1 ~]#
[root@client1 ~]#
[root@client1 ~]#
ifdown eth0[root@client1 ~]#
ifup eth0[root@client1 ~]#
/etc/init.d/network restartRenew an IP Address in Windows
Open Command Prompt → Then Type The following command
C:\Documents and Settings\Administrator> Ipconfig /release
C:\Documents and Settings\Administrator> Ipconfig /renew
C:\Documents and Settings\Administrator> Ipconfig /all
