dhcpd.conf例解

 ddns-update-style interim; //设置dhcp互动更新模式
 ignore client-updates; //忽略客户端更新



#子网声明
 subnet 192.168.12.0 netmask 255.255.255.0 {
 # --- default gateway
 option routers 192.168.12.1; //设置客户端默认网关
 option subnet-mask 255.255.255.0; //设置客户端子网掩码
 option nis-domain "ixdba.net "; //设置NIS域
 option domain-name " ixdba.net "; //设置DNS域
 option domain-name-servers 192.168.12.1; //设置DNS服务器地址
 option time-offset -18000; # Eastern Standard Time //设置时间偏差
 # option ntp-servers 192.168.12.1;
 # option netbios-name-servers 192.168.12.1;
 # --- Selects point-to-point node (default is hybrid). Don't change this unless
 # -- you understand Netbios very well
 # option netbios-node-type 2;
 range dynamic-bootp 192.168.12.128 192.168.12.254; //设置地址池
 default-lease-time 21600; //设置默认租期，单位为秒
 max-lease-time 43200; //设置客户端最长租期，单位为秒
 # we want the nameserver to appear at a fixed address
 host ns { //以下设定分配静态IP地址，不多做解释。
 next-server marvin.RedHat.com;
 hardware ethernet 12:34:56:78:AB:CD; 
 fixed-address 207.175.42.254;
 }
 }

说明：
如果想给某IP分配固定的IP地址，修改host 那一项，把网卡的Mac地址和IP进行绑定，就是最后那一段，改为相应的就可以了。