CentOS 5
DHCP Server
  Set DHCP ( Dynamic Host Configuration Protocol ) Server. If you make your linux computer DHCP server, it's neccesarry to disable DHCP function on router in LAN.

[1] Install DHCP and configure
[root@ns ~]#
yum -y install dhcp

[root@ns ~]#
cp -f /usr/share/doc/dhcp*/dhcpd.conf.sample /etc/dhcpd.conf

[root@ns ~]#
vi /etc/dhcpd.conf


# line 4: specify your network and subnetmask

subnet
192.168.0.0
 netmask
255.255.255.0
 {

# line 7 : specify default gateway

option routers
192.168.0.1
;


# line 8: specify subnetmask

option subnet-mask
255.255.255.0
;


# line 10: specify NIS domain name iy you using.
# make it comment if you don not use.

option nis-domain
"server-world.info"
;


# line 11: specify domain name

option domain-name
"server-world.info"
;


# line 12: specify IP address of DNS

option domain-name-servers
192.168.0.10
;


# line 14: make it comment

#
option time-offset
-18000;


# line 21: specify the range of IP addresses for clients

range dynamic-bootp
192.168.0.128 192.168.0.254
;


# line 22: default's terms of lease

default-lease-time
21600
;


# line 23: maximun terms of lease

max-lease-time
43200
;


# line 26: make following lines comment

#
host ns {

#
next-server marvin.redhat.com;

#
hardware ethernet 12:34:56:78:AB:CD;

#
fixed-address 207.175.42.254;

#
}


[root@ns ~]#
/etc/rc.d/init.d/dhcpd start

Starting dhcpd:
[  OK  ]

[root@ns ~]#
chkconfig dhcpd on
[2] Opemn the window below, it's "Control panel" - "Network connection" and "Property".
 
[3] Check boxes like below and click OK button.
 
[4] Netowork connection is re-connected and ip address is assigned automatically by DHCP like below.