#yum -y install dhcp 
#yum安装比较方便版本差异不大 


#cd /etc 
#cat /usr/share/doc/dhcp*/dhcpd.conf.sample >> dhcpd.conf 

#cat dhcpd.conf |grep -v "#" 

ddns-update-style interim; 
ignore client-updates; 

#以下为全局配置 
option domain-name-servers      172.30.4.4,172.31.7.7; 
option nis-domain               "cyberstep.dev"; 
option domain-name              "cyberstep.dev"; 

#subnet hosts中没有设置的话以全局变量配置为主，有侧覆盖 
#Summit X450中划分了VLAN Subnet对应Summit中的VLAN 


subnet 172.16.0.0 netmask 255.255.0.0 { 
        option routers                  172.16.0.1; 
        option subnet-mask              255.255.0.0; 
} 

subnet 172.17.0.0 netmask 255.255.0.0 { 
        option routers                  172.17.0.1; 
        option subnet-mask              255.255.0.0; 
} 

subnet 172.18.0.0 netmask 255.255.0.0 { 
        option routers                  172.18.0.1; 
        option subnet-mask              255.255.0.0; 
} 

subnet 172.19.0.0 netmask 255.255.0.0 { 
        option routers                  172.19.0.1; 
        option subnet-mask              255.255.0.0; 
} 

subnet 172.20.0.0 netmask 255.255.0.0 { 
        option routers                  172.20.0.1; 
        option subnet-mask              255.255.0.0; 
} 

subnet 172.21.0.0 netmask 255.255.0.0 { 
        option routers                  172.21.0.1; 
        option subnet-mask              255.255.0.0; 
} 

subnet 172.30.0.0 netmask 255.255.0.0 { 
        option routers                  172.30.0.1; 
        option subnet-mask              255.255.0.0; 
} 

subnet 172.31.0.0 netmask 255.255.0.0 { 
        option routers                  172.31.0.1; 
        option subnet-mask              255.255.0.0; 
} 

#让DHCP只LISTEN eth0 
#vi /etc/sysconfig/dhcpd 
#DHCPDARGS="eth0" 

#service dhcpd start 
#启动dhcp