Build DHCP Server
author: Liangzhi Zou
date: 2001/19/7
The Dynamic Host Congiguration Protocol(DHCP) is an Internet
protocol for automating the configuration of computers that use TCP
/IP. DHCP can be used to automatically assign IP addresses, to deliver
TCP/IP stack configuration parameters such as the subnet mask
and default router, and to provide other configuration information
such as the addresses for printer,time and news servers.
This page records process that I build DHCP server of Solution
Garden in 10art-ni Corporation,Japan. And provides some information
about DHCP.
1.Operation System
Redhat Linux 6.2
2.DHCP Source
dhcp-2.0-5.i386.rpm
3.Edit dhcpd.conf file
The dhcpd.conf file is a free-form ASCII text file. It is parsed
by the recursive-descent parser built into dhcpd. The file may contain
extra tabs and newlines for formatting purposes. Keywords in the file
are case-insensitive.
Declarations are used to describe the topology of the network,to
describe clients on the network,to provide address that can be assigned
to clients,or to apply a group of parameters to a group of declarations.
In any group of parameters and declarations,all parameters must be
specified befor any declarations which depend on those parameters may
be specified.
Declarations about network topology and connect about them is below:
share-network
|
|---->subnet
|
|---->group
|
|---->host
Example - A typical dhcpd.conf file will look something like below:
global parameters...
shared-network NET-ZOU{
shared-network-specific parameters...
subnet 204.254.239.0 netmask 255.255.255.224{
subnet-specific parameters...
range 204.254.239.10 204.254.239.30;
}
subnet 204.254.239.32 netmask 255.255.255.224{
subnet-specific parameters...
range 204.254.239.42 204.254.239.62;
}
}
subnet 204.254.239.64 netmask 255.255.255.224{
subnet-specific parameters...
range 204.254.239.74 204.254.239.94;
}
group{
group-specific parameters...
host client1.zou.net{
host-specific parameters...
}
host client2.zou.net{
host-specific parameters...
}
}
The network topology of Solution Garden:
The dhcpd.conf file of Solution Garden:
#dhcpd.conf
#demo.com
subnet 192.168.0.0 netmask 255.255.255.0{
server-identifier 192.168.0.1;
option domain-name "demo.com";
option domain-name-servers 192.168.0.1;
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.0.255;
option routers 192.168.0.1;
default-lease-time 6000;
max-lease-time 72000;
range 192.168.0.100 192.168.0.150;
}
#virtual.com
subnet 192.168.10.0 netmask 255.255.255.0{
server-identifier 192.168.10.1;
option domain-name "virtual.com";
option domain-name-servers 192.168.10.1;
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.10.255;
option routers 192.168.10.1;
default-lease-time 6000;
max-lease-time 72000;
range 192.168.10.100 192.168.10.150;
}
4.Move modified dhcpd.conf to /etc directory.
5.Create dhcpd.lease file in /var/state/dhcp/ directory.
6.Modify /etc/rc.d/init.d/dhcpd file
#dhcpd
...
start)
#Start daemons;
echo -n "Starting dhcpd:"
daemon /usr/sbin/dhcpd --> daemon /usr/sbin/dhcpd eth1 eth2
....
7.Make DHCP server automatically on in runlevel 345,even the system be reboot.
#chkconfig --level 345 dhcpd on
|