DHCP服务配置

1.环境需求：

网段：192.168.84.0/24 网关：192.168.84.10 DNS：61.235.70.252
每个IP默认租约:2天 最长为5天
分配范围：192.168.84.100-192.168.84.200 其他保留
为主机MAC 00-0C-29-25-3B-55  固定分配：192.168.84.88

 

2.配置/etc/dhcpd.conf

由于默认/etc/dhcpd.conf 为空的，可以参考/usr/share/doc/dhcp*/dhcpd.conf.sample 范本。
可以直接复制成/etc/dhcpd.conf

[root@server ~]# cp /usr/share/doc/dhcp-3.0.5/dhcpd.conf.sample /etc/dhcpd.conf

配置文件如下：

[root@server ~]# cat /etc/dhcpd.conf 

ddns-update-style none;    #不要更新DDNS
ignore client-updates;    #忽略客户端更新
subnet 192.168.84.0 netmask 255.255.255.0 {        #网段设置
# --- default gateway
        option routers                  192.168.84.10;        #网关
        option subnet-mask              255.255.255.0;        #子网掩码
        option nis-domain               "Server.org";        #NIS的参数(可注释)
        option domain-name              "Server.org";        #/etc/resolvconf 搜索域
        option domain-name-servers      61.235.70.252;    #DNS
        option time-offset              -18000; # Eastern Standard Time
#       option ntp-servers              192.168.84.10;
#       option netbios-name-servers     192.168.84.10;
# --- 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 192.168.84.100 192.168.84.200;
        default-lease-time 172800;        #默认租约2天，以秒为单位
        max-lease-time 432000;        #最长租约5天，以秒为单位
        # we want the nameserver to appear at a fixed address
        host ns {                            #固定分配
                hardware ethernet 00:0C:29:25:3B:55;        #固定分配电脑的MAC
                fixed-address 192.168.84.88;            #要固定分的IP
        }
}

完成配置之后，就启动DHCP服务

[root@server ~]# /etc/init.d/dhcpd start

 

3.测试客户机分配情况

固定分配的电脑 MAC为： 00-0C-29-25-3B-55

 

 

4.查看租约信息

[root@server ~]# cat /var/lib/dhcpd/dhcpd.leases
lease 192.168.84.128 {
  starts 3 2011/01/05 02:09:04;
  ends 3 2011/01/05 02:10:39;
  tstp 3 2011/01/05 02:10:39;
  binding state free;
  hardware ethernet 00:0c:29:25:3b:55;
  uid "\001\000\014)%;U";
}
lease 192.168.84.200 {
  starts 3 2011/01/05 02:20:41;
  ends 5 2011/01/07 02:20:41;
  tstp 5 2011/01/07 02:20:41;
  binding state active;
  next binding state free;
  hardware ethernet 00:0c:29:25:3b:54;
  uid "\001\000\014)%;T";
  client-hostname "lyy-b8a4287ba95";
}

 

经过以上配置，一个简单的DCHP实例就完成了

解决早期版本linux多网卡同时监听DHCP，导致分配出错问题。

[root@server ~]# cat /etc/sysconfig/dhcpd
# Command line options here
DHCPDARGS="eth1"        #修改成要监听的网段