Linux DHCP服务

DHCP:Dynamic Host Configuration Protocol
 前身：Bootp:无盘工作站

 RARP 反向地址解析协议

 lease 租约
  vim /var/lib/dhcpd/dhcpd.leases

 基于UDP 
  服务器端：67
  客户端：68

 DHCP Discovery 客户端ip地址请求
 DHCP Offer 服务器端提供
 DHCP Request 客户端请求
 DHCP ACK 服务端响应

 release 地址释放
 归还，地址到期，关机

 续租：

 dhcp，dhcpd,dhcre
  主配置文件：/etc/dhcpd.conf,/etc/sysconfig/dhcpd
   dhcpd.conf样例  /usr/share/doc/dhcp-3.0.5/dhcpd.conf.example
    
  启动脚本：/etc/init.d/dhcpd   start|stop|status|restart

  /etc/sysconfig/dhcpd
   DHCPDARGS=Eth0

 dhcpclient
  -d
  dhcpclient eth0 
  killall dhcpclient

  PEERDNS=no

 类别定义：
 class "vmware" {
  match if substring (hardware,1,3) = 00:0C:29;
 }

 pool {
  allow members of "vmware";
  range 192.168.10.31 192.168.10.40;
 }

 pool {
  deny members of "vmware";
  range 192.168.10.101 192.168.10.200;
 }

DHCP中继：
 /etc/sysconfig/dhcrelay
  INTERFACES="eth1 eth0"
  DHCPSERVERS="192.168.10.6"
 service dhcrelay start