配置：
内网路由：
内网路由：
interface FastEthernet0/0
 no ip address
 duplex auto
 speed auto
!
interface FastEthernet0/0.2
 encapsulation dot1Q 2
 ip address 192.168.1.1 255.255.255.0
!
interface FastEthernet0/0.3
 encapsulation dot1Q 3
 ip address 192.168.2.1 255.255.255.0
!
interface FastEthernet0/0.4
 encapsulation dot1Q 4
 ip address 192.168.3.1 255.255.255.0
！
interface Serial0/0
 ip address 12.12.12.1 255.255.255.0
!
router rip
 version 2
 network 12.0.0.0
 network 192.168.1.0
 network 192.168.2.0
 network 192.168.3.0
 no auto-summary
!
内网交换机配置：
!
interface FastEthernet0/1
 switchport mode trunk
!
interface FastEthernet0/2
 switchport access vlan 2
 switchport mode access
!
interface FastEthernet0/3
 switchport access vlan 3
 switchport mode access
!
interface FastEthernet0/4
 switchport access vlan 4
 switchport mode access
边界路由配置：
interface Serial0/0
 ip address 12.12.12.2 255.255.255.0
 ip nat inside
 clock rate 64000
!
interface Serial0/1
 ip address 23.23.23.2 255.255.255.0
 ip nat outside
 clock rate 64000
!
router rip
 version 2
 network 12.0.0.0
 default-information originate
 no auto-summary
!
ip nat pool cisco 23.23.23.2 23.23.23.2 netmask 255.255.255.0
ip nat inside source list 1 pool cisco overload
ip classless
ip route 0.0.0.0 0.0.0.0 23.23.23.3
!
!
access-list 1 permit 192.168.0.0 0.0.255.255
ISP路由就在两个接口上配置个IP，服务器上也就配一个IP，没其它的了。那个192.168.10.0网段我用12.0.0.0代替了。