linux下配置dhcp服务器及dhcp代理服务器

一、安装配置dhcp服务器

1、首先设置服务器网卡ip地址

修改配置文件vim /etc/sysconfig/network-scripts/ifcfg-eth0

更改如下三项即可:

IPADDR=172.17.17.2

NETMASK=255.255.255.0

GATEWAY=172.17.17.1

重启网络服务

service network restart

2、查看服务器是否安装dhcp服务

rpm -qa|grep dhcp

如果未安装，则挂载系统光盘，安装dhcp软件包

rpm -ivh dhcp-3*

rpm -ivh dchp-devel*

yum配置好的话，可以直接使用yum安装，

yum install dhcp

3、修改dhcp主配置文件

dhcp主配置文件默认是空的，需要根据模板修改

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

修改内容如下：

dns-update-style none;

ignore client-updates;

#log-faulity local4;

subnet 172.17.17.0 netmask 255.255.255.0 {

option routers 172.172.17.1;

option subnet-mask 255.255.255.0;

option nis-domain "domain.org";

option domain-name "domain.org";

option domain-name-servers 202.106.0.20;

option time-offset -18000; # Eastern Standard Time

range dynamic-bootp 172.17.17.100 172.17.17.254;

default-lease-time 21600;

max-lease-time 43200;

# host ns {

# next-server marvin.redhat.com;

# hardware ethernet 12:34:56:78:AB:CD;

# fixed-address 192.168.1.22;

# }

}

subnet 192.168.1.0 netmask 255.255.255.0 {

option routers 192.168.1.1;

option subnet-mask 255.255.255.0;

option nis-domain "domain.org";

option domain-name "domain.org";

option domain-name-servers 202.106.0.20;

option time-offset -18000; # Eastern Standard Time

range dynamic-bootp 192.168.1.100 192.168.1.254;

default-lease-time 21600;

max-lease-time 43200;

}

subnet 192.168.2.0 netmask 255.255.255.0 {

option routers 192.168.2.1;

option subnet-mask 255.255.255.0;

option nis-domain "domain.org";

option domain-name "domain.org";

option domain-name-servers 202.106.0.20;

option time-offset -18000; # Eastern Standard Time

range dynamic-bootp 192.168.2.100 192.168.2.254;

default-lease-time 21600;

max-lease-time 43200;

}

重启dhcp服务

service dhcpd restart

chkconfig dhcpd on

二、配置dhcp中继

首先配置服务器IP地址

eth0:172.17.17.1/24

eth1:192.168.1.1/24

eth2:192.168.2.1/24

安装dhcp软件包，同dhcp服务器配置

修改中继配置文件

/etc/sysconfig/dhcrelay

INTERFACES="eth0 eth1 eth2"

DHCPSERVERS="172.17.17.2"

开启ip转发功能

vim /etc/sysctl.conf

更改第一行的配置 net.ipv4.ip_forward = 1

重启DHCP中继服务

/etc/init.d/dhcrelay restart

chkconfig dhcrelay on

三、配置dhcp客户端

使用setup命令

设置网卡eth0获取IP方式为dhcp

dhclient eth0

或者service network restat

查看网卡获得的IP地址

ifconfig eth0

eth0 Link encap:Ethernet HWaddr 00:0C:29:69:15:FE

inet addr:192.168.1.254 Bcast:192.168.1.255 Mask:255.255.255.0

inet6 addr: fe80::20c:29ff:fe69:15fe/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:9919 errors:0 dropped:0 overruns:0 frame:0

TX packets:189 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:919624 (898.0 KiB) TX bytes:22094 (21.5 KiB)

Interrupt:169 Base address:0x2000

实验条件

dhcp 服务器使用的虚拟机的vm1网络

中继服务器使用的是虚拟机的vm1 vm2 和vm8网络

dhcp客户端使用的是虚拟机的vm2网络

默认情况下0代表桥接

vm1代表nat

vm8代表host-only

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