(3)安装DHCP服务器
　　1、源程序下载地址是：ftp://ftp.isc.org/isc/dhcp/dhcp-3.0.tar.gz ，我们的版本是：dhcpd-3.0

　　2、复制到：/usr/local/scr后解压：tar zxvf dhcp-3.0.tar.gz

　　3、cd /usr/local/src/dhcp-3.0.tar.gz

　　4、./configure

　　5、make(如果不是第一次编译，先make clean)

　　6、make install

　　7、cp ./server/dhcpd.conf /etc

　　8、编辑这个文件，看起来类似下面这样：（要更改的地方用粗体标出）


　　# dhcpd.conf
　　#
　　# Sample configuration file for ISC dhcpd
　　#

　　# option definitions common to all supported networks...
　　option domain-name "rd.xxx.com";
　　option domain-name-servers compaq.rd.xxx.com;

　　default-lease-time 86400;
　　max-lease-time 172800;

　　ddns-update-style ad-hoc;

　　# If this DHCP server is the official DHCP server for the local
　　# network, the authoritative directive should be uncommented.
　　#authoritative;

　　# Use this to send dhcp log messages to a different log file (you also
　　# have to hack syslog.conf to complete the redirection).
　　log-facility local7;

　　# No service will be given on this subnet, but declaring it helps the
　　# DHCP server to understand the network topology.

　　# This is a very basic subnet declaration.

　　subnet 21.9.22.0 netmask 255.255.255.224 {
　　　　range 21.9.22.2 21.9.22.6;
　　　　option routers 21.9.22.1;
　　}

　　# This declaration allows BOOTP clients to get dynamic addresses,
　　# which we don't really recommend.

　　#subnet 10.254.239.32 netmask 255.255.255.224 　　{
　　　　# range dynamic-bootp 10.254.239.40 10.254.239.60;
　　　　# option broadcast-address 10.254.239.31;
　　　　# option routers rtr-239-32-1.example.org;
　　#}

　　# A slightly different configuration for an internal subnet.
　　#subnet 10.5.5.0 netmask 255.255.255.224 {
　　# range 10.5.5.26 10.5.5.30;
　　# option domain-name-servers ns1.internal.example.org;
　　# option domain-name "internal.example.org";
　　# option routers 10.5.5.1;
　　# option broadcast-address 10.5.5.31;
　　# default-lease-time 600;
　　# max-lease-time 7200;
　　#}

　　# Hosts which require special configuration options can be listed in
　　# host statements. If no address is specified, the address will be
　　# allocated dynamically (if possible), but the host-specific information
　　# will still come from the host declaration.

　　#host passacaglia {
　　# hardware ethernet 0:0:c0:5d:bd:95;
　　# filename "vmunix.passacaglia";
　　# server-name "toccata.fugue.com";
　　#}

　　# Fixed IP addresses can also be specified for hosts. These addresses
　　# should not also be listed as being available for dynamic assignment.
　　# Hosts for which fixed IP addresses have been specified can boot using
　　# BOOTP or DHCP. Hosts for which no fixed address is specified can only
　　# be booted with DHCP, unless there is an address range on the subnet
　　# to which a BOOTP client is connected which has the dynamic-bootp flag
　　# set.
　　#host fantasia {
　　# hardware ethernet 08:00:07:26:c0:a5;
　　# fixed-address fantasia.fugue.com;
　　#}

　　# You can declare a class of clients and then do address allocation
　　# based on that. The example below shows a case where all clients
　　# in a certain class get addresses on the 10.17.224/24 subnet, and all
　　# other clients get addresses on the 10.0.29/24 subnet.
　　
　　#class "foo" {
　　# match if substring (option vendor-class-identifier, 0, 4) = "SUNW";
　　#}

　　#shared-network 224-29 {
　　# subnet 10.17.224.0 netmask 255.255.255.0 {
　　# option routers rtr-224.example.org;
　　# }
　　# subnet 10.0.29.0 netmask 255.255.255.0 {
　　# option routers rtr-29.example.org;
　　# }
　　# pool {
　　# allow members of &