linux上搭建DHCP服务

linux上搭建DHCP服务

 

1.首先安装DHCP服务需要的软件包

 

yum install dhcp*

 

2.手工编译DHCP主配置文件/etc/dhcp/dhcpd.conf

 

配置内容如下

 

ddns-update-style none; 

default-lease-time 600; 

max-lease-time 1200; 

option domain-name "ceshi.com"; 

option domain-name-servers 192.168.3.202; 

subnet 192.168.3.0 netmask 255.255.255.0 { 

     range 192.168.3.190 192.168.3.210; 

     option subnet-mask  255.255.255.0; 

     option routers       192.168.3.253; 

  host Server01 { 

        hardware ethernet B0:51:8E:01:94:86; 

        fixed-address     192.168.3.202; 

  } 

}

 

3使用命令测试配置未见是否存在语法错误

 

[root@ns1 ~]# service dhcpd configtest

Syntax: OK

 

正常

 

4开启允许分配IP地址的主机端口文件

 

vim /etc/sysconfig/dhcpd

 

DHCPDARGS= eth0 

 

测试通过测试成功获取IP地址

 

Mar 28 10:17:13 localhost dhcpd: DHCPREQUEST for 192.168.3.190 from 00:23:4d:dc:36:41 (home) via eth0

Mar 28 10:17:13 localhost dhcpd: DHCPACK on 192.168.3.190 to 00:23:4d:dc:36:41 (home) via eth0

Mar 28 10:18:53 localhost named-sdb[4247]: network unreachable resolving 'py.qlogo.cn/A/IN': 2001:dc7:1000::1#53

Mar 28 10:19:48 localhost dhcpd: DHCPREQUEST for 192.168.0.163 from 18:87:96:a0:ec:33 via eth0: ignored (not authoritative).

Mar 28 10:22:13 localhost dhcpd: DHCPREQUEST for 192.168.3.190 from 00:23:4d:dc:36:41 (home) via eth0

Mar 28 10:22:13 localhost dhcpd: DHCPACK on 192.168.3.190 to 00:23:4d:dc:36:41 (home) via eth0

 

成功分配给MAC为00:23:4d:dc:36:41主机

 

DHCP中继让不同网主机跨越网段获取DHCP服务器分配IP，

 

1安装DHCP服务包

 

yum -y install dhcp*

 

2开启服务器的路由转发功能

 

vim /etc/sysctl.conf

 

将net.ipv4.ip_forward=0修改为1启用

 

使用命令让其修改生效

 

sysctl -p

 

3设置允许DHCP中继接口及DHCP服务器修改文件

 

[root@ns1 ~]# vim /etc/sysconfig/dhcrelay 

# Command line options here

INTERFACES="eth0 eth1"

DHCPSERVERS="192.168.3.202"

 

4开启服务

 

/etc/init.d/dhcrelay restart