linux dhcp配置 dhcp多网段配置

 

                                                      Dhcp安装配置

方法一：

1、Yum –y install dhcp

方法二：

挂载光盘：

Mkdir –p /home/cd

mount /dev/cdrom /home/cd

cd /home/cd/

ls | grep dhcp

rpm –ivh dhcp……….rpm

2、查看默认的配置文件及路径：

Cat /etc/dhcpd.conf

# DHCP Server Configuration file.

#   see /usr/share/doc/dhcp*/dhcpd.conf.sample 

# cp /usr/share/doc/dhcp-3.0.5/dhcpd.conf.sample /etc/dhcpd.conf

Cp:是否覆盖？/etc/dhcpd.conf？y

# vi /etc/dhcpd.conf

ddns-update-style interim;

ignore client-updates;

shared-network xiaolong {

option domain-name-servers      202.96.134.33,8.8.8.8;

default-lease-time 21600;

max-lease-time 43200;

option time-offset              -18000;

 

subnet 192.168.10.0 netmask 255.255.255.0 {

 

        option routers                  192.168.10.1;

        option subnet-mask              255.255.255.0;

        range dynamic-bootp 192.168.10.30 192.168.10.220;

 

 }

subnet 192.168.20.0 netmask 255.255.255.0 {

 

        option routers                  192.168.20.1;

        option subnet-mask              255.255.255.0;

        range dynamic-bootp 192.168.20.30 192.168.20.220;

 

 

 }

}

 

eth0      Link encap:Ethernet HWaddr 00:0C:29:4E:65:44 

          inet addr:192.168.10.1 Bcast:192.168.3.255 Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

          RX packets:505089 errors:0 dropped:0 overruns:0 frame:0

          TX packets:13462 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:62108907 (59.2 MiB) TX bytes:1827624 (1.7 MiB)

 

eth0:1    Link encap:Ethernet HWaddr 00:0C:29:4E:65:44 

          inet addr:192.168.20.1 Bcast:192.168.3.255 Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

 

eth0:2    Link encap:Ethernet HWaddr 00:0C:29:4E:65:44 

          inet addr:192.168.30.1 Bcast:192.168.3.255 Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

 

 

 

3、运用在那个网卡/etc/sysconfig/dhcpd配置

# vi /etc/sysconfig/dhcpd

# Command line options here

DHCPDARGS= （”eth0 eth1”）

4、启动服务：

# service dhcpd start

# netstat -anpu | grep dhcpd

udp        0      0 0.0.0.0:67                  0.0.0.0:*                               2934/dhcpd

5、查看地址获取：

# tail -50 /var/lib/dhcpd/dhcpd.leases

6、DHCP中继：

1、开启路由转发：

# vi /etc/sysctl.conf

# Controls IP packet forwarding

net.ipv4.ip_forward = 1

#sysctl –p

2、设置允许DHCP中继数据的接口及DHCP服务器的IP地址：

# vi /etc/sysconfig/dhcrelay

# Command line options here

INTERFACES="eth0 eth1"

DHCPSERVERS="192.168.1.1"

3、启动中继程序：

Service dhcrelay start

Chkconfig –level 35 dhcrelay on