RHEL5下的DHCP服务和DHCP中继
[root@localhost ~]# rpm -q
package dhcp is not installed ( 查看dhcp包没有安装)
[root@localhost ~]# mount /dev/cdrom /mnt （挂载光盘并安装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 （编辑dhcp配置文件，建两个作用域）
#
# 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 （启动dhcp）
Starting dhcpd: [ OK ]
[root@localhost ~]# netstat -nupl （查看当前的UDP端口侦听）
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
客户端获取到的IP信息如下：
[root@localhost ~]# cat /var/lib/dhcpd/dhcpd.leases （查看租约文件）
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 （设置dhcp服务在35级别自动启动）
DHCP中继的实现：
ogin as: root （使用管理员用户登陆）
password:
Last login: Fri Nov 14 04:33:18 2008 from 192.168.0.2
[root@localhost ~]# mount /dev/cdrom /mnt （挂载光盘并安装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目录下的文件信息）
/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 （编辑/etc/sysconfig/dhcrelay 文件并启用中继功能）
# Command line options here
INTERFACES="eth0 eth1" （定义在那个网卡上启用中继功能）
DHCPSERVERS="192.168.0.20" （定义dhcp服务器的IP）
[root@localhost ~]# service dhcrelay start （启用中继服务）
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
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端口的侦听信息）
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 （设置dhcp中继服务在35级别自动启用）
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