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DHCP简单例子

news 来源：原创 2025/5/11 15:00:34

本文描述了使用ENsp模拟DHCP Global和DHCP 中继两种简单配置过程。

拓朴图

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DHCP全局配置

此配置较为简单，因为全局既支持局域网，也支持跨网络分配。

# DHCP Server1 
<Huawei>system-view 	
[Huawei]sysname server1
[server1]dhcp enable 												# 启用DHCP 服务
[server1]ip pool dhcp_pool											# 创建地址池
[server1-ip-pool-dhcp_pool] gateway-list 192.168.0.1 				# 配置网关
[server1-ip-pool-dhcp_pool] network 192.168.0.0 mask 255.255.255.0 	# 配置网段
[server1-ip-pool-dhcp_pool]interface GigabitEthernet0/0/0
[server1-GigabitEthernet0/0/0] ip address 192.168.0.1 255.255.255.0 
[server1-GigabitEthernet0/0/0] dhcp select global					# 启用DHCP 全局模式# PC 测试
PC>ipconfigLink local IPv6 address...........: fe80::5689:98ff:fef7:6b94
IPv6 address......................: :: / 128
IPv6 gateway......................: ::
IPv4 address......................: 192.168.0.254
Subnet mask.......................: 255.255.255.0
Gateway...........................: 192.168.0.1
Physical address..................: 54-89-98-F7-6B-94
DNS server........................:PC>ping 192.168.0.1Ping 192.168.0.1: 32 data bytes, Press Ctrl_C to break
From 192.168.0.1: bytes=32 seq=1 ttl=255 time=31 ms
From 192.168.0.1: bytes=32 seq=2 ttl=255 time=47 ms
From 192.168.0.1: bytes=32 seq=3 ttl=255 time=47 ms
From 192.168.0.1: bytes=32 seq=4 ttl=255 time=47 ms
From 192.168.0.1: bytes=32 seq=5 ttl=255 time=16 ms--- 192.168.0.1 ping statistics ---5 packet(s) transmitted5 packet(s) received0.00% packet lossround-trip min/avg/max = 16/37/47 ms

DHCP 中继

中继的意思就是要跨网络了，如果使用三层交换机就要划分vlan，比较麻烦。依旧在DHCP Server2创建地址池，通过10.0.0.1端口下发地址。DHCP 中继要能够ping同10.0.0.1，从而获取DHCP配置的地址池，给指定端口下发地址。

# DHCP Server2 同DHCP Server1配置一样
<Huawei>system-view 	
[Huawei]sysname server2
[server2]dhcp enable 
[server2]ip pool dhcp_pool											
[server2-ip-pool-dhcp_pool] gateway-list 192.168.0.1 				
[server2-ip-pool-dhcp_pool] network 192.168.0.0 mask 255.255.255.0 
[server2-ip-pool-dhcp_pool]interface GigabitEthernet0/0/0
[server2-GigabitEthernet0/0/0] ip address 192.168.0.1 255.255.255.0 
[server2-GigabitEthernet0/0/0] dhcp select global# DHCP 中继
<Huawei>system-view 	
<Huawei>dhcp enable[Huawei]interface GigabitEthernet0/0/0
[Huawei-GigabitEthernet0/0/0] ip address 10.0.0.2 255.255.255.0 [Huawei-GigabitEthernet0/0/0]interface GigabitEthernet0/0/1
[Huawei-GigabitEthernet0/0/1] ip address 192.168.0.1 255.255.255.0 
[Huawei-GigabitEthernet0/0/1] dhcp select relay	# 配置为中继模式
[Huawei-GigabitEthernet0/0/1] dhcp relay server-ip 10.0.0.1	# 只想DHCP 服务端口地址[Huawei-GigabitEthernet0/0/1]ip route-static 0.0.0.0 0.0.0.0 10.0.0.1 # 配置默认路由# PC 测试
PC>ipconfigLink local IPv6 address...........: fe80::5689:98ff:fe5d:5f11
IPv6 address......................: :: / 128
IPv6 gateway......................: ::
IPv4 address......................: 192.168.0.254
Subnet mask.......................: 255.255.255.0
Gateway...........................: 192.168.0.1
Physical address..................: 54-89-98-5D-5F-11
DNS server........................:PC> ping 192.168.0.1Ping 192.168.0.1: 32 data bytes, Press Ctrl_C to break
From 192.168.0.1: bytes=32 seq=1 ttl=255 time=31 ms
From 192.168.0.1: bytes=32 seq=2 ttl=255 time=16 ms
From 192.168.0.1: bytes=32 seq=3 ttl=255 time=16 ms
From 192.168.0.1: bytes=32 seq=4 ttl=255 time=15 ms
From 192.168.0.1: bytes=32 seq=5 ttl=255 time<1 ms--- 192.168.0.1 ping statistics ---5 packet(s) transmitted5 packet(s) received0.00% packet lossround-trip min/avg/max = 0/15/31 ms