多个vlans的DHCP配置

Question

我在Packet上有以下网络。主机处于不同的vlans中。我的目标是DHCP服务器可以向主机提供IP。

下面是我为每个vlan所做的(示例是vlan 10)：

Switch(config)#int vlan 10

Switch(config-if)# ip add 192.168.11.1 255.255.255.0

Switch(config-if)# no shut

Switch(config-if)# ip helper-add 192.168.10.254

然后，我为DHCP服务器中的每个vlan创建了一个池，因此每个vlan的默认网关是我刚刚分配给vlan的IP。DHCP服务器的静态IP为192.168.10.254 (ICDR \24)。但是它不起作用。你能给我一个提示，说明我怎样才能使它发挥作用吗？谢谢。

编辑：

下面是开关的启动配置：

version 15.0
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname SW
!
!
!
no ip domain-lookup
!
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!

    interface FastEthernet0/1

!
interface FastEthernet0/2
!
interface FastEthernet0/3
!
interface FastEthernet0/4
!
interface FastEthernet0/5
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet0/6
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet0/7
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet0/8
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet0/9
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet0/10
 switchport access vlan 20
 switchport mode access
!
interface FastEthernet0/11
 switchport access vlan 20
 switchport mode access
!
interface FastEthernet0/12
 switchport access vlan 20
 switchport mode access
!
interface FastEthernet0/13
 switchport access vlan 20
 switchport mode access
!
interface FastEthernet0/14
 switchport access vlan 20
 switchport mode access
!
interface FastEthernet0/15
 switchport access vlan 30
 switchport mode access
!
interface FastEthernet0/16
 switchport access vlan 30
 switchport mode access
!
interface FastEthernet0/17
 switchport access vlan 30
 switchport mode access
!
interface FastEthernet0/18
 switchport access vlan 30
 switchport mode access
!
interface FastEthernet0/19
 switchport access vlan 30
 switchport mode access
!
interface FastEthernet0/20
 switchport access vlan 40
 switchport mode access
!
interface FastEthernet0/21
 switchport access vlan 40
 switchport mode access
!
interface FastEthernet0/22
 switchport access vlan 40
 switchport mode access
!
interface FastEthernet0/23
 switchport access vlan 40
 switchport mode access
!
interface FastEthernet0/24
 switchport access vlan 40
 switchport mode access
!
interface GigabitEthernet0/1
!
interface GigabitEthernet0/2
!
interface Vlan1
 no ip address
 shutdown
!
interface Vlan10
 ip address 192.168.11.1 255.255.255.0
 ip helper-address 192.168.10.254
!
interface Vlan20
 ip address 192.168.12.1 255.255.255.0
 ip helper-address 192.168.10.254
!
interface Vlan30
 ip address 192.168.13.1 255.255.255.0
 ip helper-address 192.168.10.254
!
interface Vlan40
 ip address 192.168.14.1 255.255.255.0
 ip helper-address 192.168.10.254
!
!
!
!
line con 0
!
line vty 0 4
 login
line vty 5 15
 login
!
!
!
!
end

Answer 1

至少有两件事是错的。

首先，虽然图表显示了DHCP服务器，但在192.168.10.0/24网络上没有任何接口。那么，您的交换机如何向服务器发送通信量呢？

其次，您的交换机是第二层设备，因此它不能在网络之间路由通信量。你需要一个第三层交换机或路由器来做到这一点。