DHCP中继实验
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DHCP中继实验
图1-1
注:如无特别说明,描述中的R1或SW1对应拓扑中设备名称末尾数字为1的设备,R2或SW2对应拓扑中设备名称末尾数字为2的设备,以此类推
- 按照图示配置IP地址
- 配置R1为DHCP服务器,能够跨网段为
192.168.2.0/24
网段自动分配IP地址。要求分配DNS地址为202.103.24.68
和202.103.0.117
- PC3获取IP地址后,能够访问到
192.168.1.1
- 配置IP地址部分略
配置R1为DHCP服务器,能够跨网段为
192.168.2.0/24
网段自动分配IP地址分析:默认情况下,DHCP只能为和本机处于同一网段的客户端分配IP地址。现在要求跨网段分配IP地址,就需要配置DHCP中继来实现
在R1上创建的地址池必须要宣告192.168.2.0/24
网段。DHCP分配的网关地址应该是192.168.2.0/24
网段的真实网关,根据拓扑得知,网关就是R2的g0/1接口,IP地址为192.168.2.254
DHCP的IP地址请求和应答报文都是广播形式发送,默认情况下,是无法穿越路由器的,所以需要在R2上开启DHCP中继功能,使DHCP报文能够跨网段转发
另外,192.168.2.0/24
网段对R1来说,是非直连网段,要使R1和PC3连通,R1上必须具有到达192.168.2.0/24
网段的路由信息
步骤1:在R1上开启DHCP功能,并创建1
号DHCP地址池,宣告网段192.168.2.0/24
,网关为192.168.2.254
,DNS为202.103.24.68
和202.103.0.117
[R1]dhcp enable [R1]dhcp server ip-pool 1 [R1-dhcp-pool-1]network 192.168.2.0 mask 255.255.255.0 [R1-dhcp-pool-1]gateway-list 192.168.2.254 [R1-dhcp-pool-1]dns-list 202.103.24.68 202.103.0.117
步骤2:在R2上开启DHCP功能,并在连接客户端的接口(g0/1)上开启DHCP中继功能,并指定DHCP服务器的IP地址
[R2]dhcp enable [R2]interface g0/1 [R2-GigabitEthernet0/1]dhcp select relay [R2-GigabitEthernet0/1]dhcp relay server-address 192.168.1.1
步骤3:在R1上配置默认路由,使R1的DHCP协议报文能够到达PC3
[R1]ip route-static 0.0.0.0 0 192.168.1.2
步骤4:把PC3的IP地址模式设置为自动获取,发现可以获取到
192.168.2.0/24
网段的IP地址,如图1-2所示
图1-2在PC3上
Ping 192.168.1.1
,确认可以Ping通<H3C>ping 192.168.1.1 Ping 192.168.1.1 (192.168.1.1): 56 data bytes, press CTRL_C to break 56 bytes from 192.168.1.1: icmp_seq=0 ttl=254 time=22.000 ms 56 bytes from 192.168.1.1: icmp_seq=1 ttl=254 time=51.000 ms 56 bytes from 192.168.1.1: icmp_seq=2 ttl=254 time=21.000 ms 56 bytes from 192.168.1.1: icmp_seq=3 ttl=254 time=43.000 ms 56 bytes from 192.168.1.1: icmp_seq=4 ttl=254 time=34.000 ms
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