周见资料DHCP，单个网卡，多个网段.doc

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1、DHCP，单个网卡，多个网段如果你的DHCP服务只监听一个网卡，这个网卡绑定多个IP，比如192.168.0.1,192.168.1.1而想要DHCP同时可以分配2个网段的IP请求，像下面这样的配置(dhcpd.conf)subnet192.168.0.0netmask255.255.255.0{  range192.168.0.100192.168.0.200;  optionrouters192.168.0.1;  optiondomain-name-servers192.168.2.1,202.

2、112.31.58;}subnet192.168.1.0netmask255.255.255.0{  range192.168.1.100192.168.2.200;  optionrouters192.168.1.1;  optiondomain-name-servers192.168.2.1,202.112.31.58;}DHCP服务是启动不起来的，会提示Interfaceeth0matchesmultiplesharednetworks此时只要把上面的配置放到shared-network中就行了

3、，像下面这样：shared-networknetwork_tag{ ...}一般情况下，单网卡DHCP服务器分配多网段主要用于VLAN场合，当然DHCP服务器本生也要能支持VLAN，linux内核已经对802.1q支持了，只需要下载vconfig软件包进行配置下就行了，具体就不说了，网上很多关于这样的帖子。下面是一个典型的应用例子：ClientAreaA-----Switch-----VLAN1-----------,ClientAreaB-----Switch-----VLAN2--------Sw

4、itch----Trunk---DHCPServer                        ClientAreaC-----Switch-----VLAN3-----------'DHCP服务器在分配IP时，会根据DHCP请求数据包中VLAN的标识来决定分配哪个网段的IP，这样可以保证同一VLAN的用户分配的IP始终是同一网段的，当然交换机必须得支持VLAN和DHCPrelay功能我的配置文件（Ubuntu下）1：/etc/network/interfaceautoeth0ifaceeth0i

5、netstaticaddress192.168.0.1netmask255.255.255.0network192.168.0.0broadcast192.168.0.255gateway192.168.0.254autoeth0:0ifaceeth0:0inetstaticaddress192.168.1.1netmask255.255.255.0network192.168.0.0broadcast192.168.0.255gateway192.168.1.2542：/etc/dhcpd.conf

6、default-lease-time   21600;max-lease-time    21600;optiondomain-name-servers222.92.109.230,61.177.7.1,61.147.37.1;optiondomain-name   "glfsoft.com";shared-networknetwork_tag{subnet192.168.0.0netmask255.255.255.0{# range192.168.0.21192.168.0.31; optionbr

7、oadcast-address192.168.0.255; optionsubnet-mask255.255.255.0; optionrouters192.168.0.254;  next-server192.168.0.254; hostkook{  hardwareethernet00:1A:4B:58:36:9D;  fixed-address192.168.0.9; }}subnet192.168.1.0netmask255.255.255.0{# range192.168.1.21192.

8、168.1.31; optionbroadcast-address192.168.1.255; optionsubnet-mask255.255.255.0; optionrouters192.168.1.254;  next-server192.168.1.254; hostkook2{  hardwareethernet00:E0:A0:11:BE:21;  fixed-address192.168.1.9; }}}测试后成功！