[root@localhost ~]# rpm -q dhcp
package dhcp is not installed?????????????? ( 查看dhcp包沒有安裝)

[root@localhost ~]# mount /dev/cdrom /mnt?? （掛載光盤并安裝dhcp包）
mount: block device /dev/cdrom is write-protected, mounting read-only

[root@localhost ~]# rpm -ivh /mnt/Server/dhcp-3.0.5-3.el5.i386.rpm
warning: /mnt/Server/dhcp-3.0.5-3.el5.i386.rpm: Header V3 DSA signature: NOKEY, key ID 37017186
Preparing...??????????????? ########################################### [100%]
?? 1:dhcp?????????????????? ########################################### [100%]

[root@localhost ~]# vi /etc/dhcpd.conf （編輯dhcp配置文件，建兩個作用域）

#
# DHCP Server Configuration file.
#?? see /usr/share/doc/dhcp*/dhcpd.conf.sample
#
ddns-update-style?????? interim;
default-lease-time????? 21600;
max-lease-time????????? 43200;
option domain-name???? "yang.com";
option domain-name-servers???? 192.168.0.20;
subnet 192.168.0.0???? netmask 255.255.255.0{
??????? range?? 192.168.0.100?? 192.168.0.200;
??????? option subnet-mask???? 255.255.255.0;
??????? option routers???????? 192.168.0.254;
}
subnet 172.16.0.0????? netmask 255.255.0.0{
??????? range?? 172.16.0.100??? 172.16.0.200;
??????? option subnet-mask???? 255.255.0.0;
??????? option routers???????? 172.16.0.254;
}
~
~
~
~
"/etc/dhcpd.conf" 19L, 522C （保存退出）

[root@localhost ~]# service dhcpd start??? （啟動dhcp服務）
Starting dhcpd:??????????????????????????????????????????? [ OK ]

?

[root@localhost ~]# netstat -nupl （查看當前的UDP端口偵聽）
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address?????????????? Foreign Address???????????? State?????? PID/Program name
udp??????? 0????? 0 0.0.0.0:943???????????????? 0.0.0.0:*?????????????????????????????? 1615/rpc.statd
udp??????? 0????? 0 0.0.0.0:946???????????????? 0.0.0.0:*?????????????????????????????? 1615/rpc.statd
udp??????? 0????? 0 0.0.0.0:67????????????????? 0.0.0.0:*?????????????????????????????? 3438/dhcpd
udp??????? 0????? 0 0.0.0.0:111???????????????? 0.0.0.0:*?????????????????????????????? 1590/portmap
udp??????? 0????? 0 0.0.0.0:631???????????????? 0.0.0.0:*?????????????????????????????? 1850/cupsd

?

?

?

客戶端獲取到的IP信息如下：

[root@localhost ~]# cat /var/lib/dhcpd/dhcpd.leases （查看租約文件）

lease 192.168.0.200 {
starts 5 2008/11/14 10:18:35;
ends 5 2008/11/14 16:18:35;
binding state active;
next binding state free;
hardware ethernet 00:03:ff:44:1a:b9;
uid "\001\000\003\377D\032\271";
client-hostname "dc";
}

[root@localhost ~]# chkconfig --level 35 dhcpd on （設置dhcp服務在35級別自動啟動）

?

DHCP中繼的實現：

ogin as: root??? （使用管理員用戶登陸）
root@192.168.0.254's password:
Last login: Fri Nov 14 04:33:18 2008 from 192.168.0.2
[root@localhost ~]# mount /dev/cdrom /mnt （掛載光盤并安裝dhcp包）
mount: block device /dev/cdrom is write-protected, mounting read-only
[root@localhost ~]# rpm -ivh /mnt/Server/dhcp-3.0.5-3.el5.i386.rpm
warning: /mnt/Server/dhcp-3.0.5-3.el5.i386.rpm: Header V3 DSA signature: NOKEY, key ID 37017186
Preparing...??????????????? ########################################### [100%]
?? 1:dhcp?????????????????? ########################################### [100%]

[root@localhost ~]# rpm -ql dhcp |grep /etc （查看dhcp包包含在/etc目錄下的文件信息）
/etc/dhcpd.conf
/etc/rc.d/init.d/dhcpd
/etc/rc.d/init.d/dhcrelay
/etc/sysconfig/dhcpd
/etc/sysconfig/dhcrelay

[root@localhost ~]# vi /etc/sysconfig/dhcrelay （編輯/etc/sysconfig/dhcrelay 文件并啟用中繼功能）

# Command line options here
INTERFACES="eth0 eth1" （定義在那個網卡上啟用中繼功能）
DHCPSERVERS="192.168.0.20" （定義dhcp服務器的IP）

[root@localhost ~]# service dhcrelay start （啟用中繼服務）
Starting dhcrelay: Internet Systems Consortium DHCP Relay Agent V3.0.5-RedHat
Copyright 2004-2006 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/
Listening on LPF/eth1/00:03:ff:4d:1a:b9
Sending on?? LPF/eth1/00:03:ff:4d:1a:b9
Listening on LPF/eth0/00:03:ff:42:1a:b9
Sending on?? LPF/eth0/00:03:ff:42:1a:b9
Sending on?? Socket/fallback
?????????????????????????????????????????????????????????? [ OK ]

[root@localhost ~]# netstat -unpl （查看UDP端口的偵聽信息）
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address?????????????? Foreign Address???????????? State?????? PID/Program name
udp??????? 0????? 0 0.0.0.0:646???????????????? 0.0.0.0:*?????????????????????????????? 1742/rpc.statd
udp??????? 0????? 0 0.0.0.0:649???????????????? 0.0.0.0:*?????????????????????????????? 1742/rpc.statd
udp??????? 0????? 0 0.0.0.0:67????????????????? 0.0.0.0:*?????????????????????????????? 3139/dhcrelay
udp??????? 0????? 0 0.0.0.0:111???????????????? 0.0.0.0:*?????????????????????????????? 1717/portmap
udp??????? 0????? 0 0.0.0.0:631???????????????? 0.0.0.0:*?????????????????????????????? 1977/cupsd

[root@localhost ~]# chkconfig --level 35 dhcrelay on （設置dhcp中繼服務在35級別自動啟用）

轉載于:https://blog.51cto.com/tiancong/663440

總結

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