简单的DHCP配置

简单的DHCP配置   1、安装dhcp rpm -ivh dhcp-3.0.5-7.el5   2、vim /etc/dhacd.conf   ddns-update-style interim;
ignore client-updates; subnet 192.168.0.0 netmask 255.255.255.0 {                      （DHCP范围） # --- default gateway
        option routers                  192.168.0.1;
        option subnet-mask              255.255.255.0;         option domain-name              "mail.hat.com";
        option domain-name-servers      192.168.0.8;         option time-offset              -18000; # Eastern Standard Time         range dynamic-bootp 192.168.0.128 192.168.0.254;        （IP地址分配范围）
        default-lease-time 21600;
        max-lease-time 43200;         host ns {                                                             （固定DHCP分配）
                hardware ethernet 00:22:15:53:56:07;       （客户机MAC地址）
                fixed-address 192.168.0.50;                        （固定的IP）   
                option domain-name-servers      192.168.0.9;  （DNS地址）         } }   3、客户机配置 把客户机的DHCP打开就好   *********************************************************************   多作用域配置   1、需要两块网卡，第二块网卡的IP地址是192.168.1段的，还需要打开网卡的转发功能/etc/sysct1.conf 把IPV4那里把0改成1。   2、编辑/etc/dhcpd.conf   subnet 192.168.0.0 netmask 255.255.255.0 {         option routers                  192.168.0.1;
        option subnet-mask              255.255.255.0;         option domain-name              "mail.hat.com";
        option time-offset              -18000; # Eastern Standard Time         range dynamic-bootp 192.168.0.128 192.168.0.254;
        default-lease-time 21600;
        max-lease-time 43200;
        }
subnet 192.168.1.0 netmask 255.255.255.0 {         option routers                  192.168.1.1;
        option subnet-mask              255.255.255.0;         option domain-name              "mail.hat.com";
        option time-offset              -18000; # Eastern Standard Time         range dynamic-bootp 192.168.0.128 192.168.0.254;
        default-lease-time 21600;
        max-lease-time 43200;
        }
3、配置完客户机就OK了   *********************************************************************   中继配置       1、编辑/etc/dhcpd.conf文件   ddns-update-style interim;
ignore client-updates;
shared-network test { subnet 192.168.0.0 netmask 255.255.255.0 {         option routers                  192.168.0.1;
        option subnet-mask              255.255.255.0;         option domain-name              "mail.hat.com";
        option time-offset              -18000; # Eastern Standard Time         range dynamic-bootp 192.168.0.128 192.168.0.254;
        default-lease-time 21600;
        max-lease-time 43200;
        }
subnet 192.168.1.0 netmask 255.255.255.0 {         option routers                  192.168.1.1;
        option subnet-mask              255.255.255.0;         option domain-name              "mail.hat.com";
        option time-offset              -18000; # Eastern Standard Time         range dynamic-bootp 192.168.0.128 192.168.0.254;
        default-lease-time 21600;
        max-lease-time 43200;
        }
其它的没动，只是加了一条语句。要把网卡的转发功能关闭。这里还可以添加多个网段，格式一样。   2、需要一台服务器做中继服务器，这台服务器需要两张网卡，而且还要打开网卡转发功能。然后配置/etc/sysconfig/dhcrelay   INTERFACES="eth0 eth1"           (如果不写就是搜索所有)
DHCPSERVERS="192.168.0.X"  （中继的地址）   3、现在客户端之间就可以通信了。