我正在尝试将我的 Cisco 2800 路由器配置为在 VLAN 之间进行通信并将流量路由到 Internet。VLAN 可以互相访问，但不能访问 Internet。路由器可以ping 调制解调器，但不能ping 通Internet。路由器配置如下：

Current configuration : 2904 bytes
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! Last configuration change at 03:36:32 UTC Thu Apr 27 2017
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version 15.0
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
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hostname Router
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boot-start-marker
warm-reboot
boot-end-marker
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enable password tyson987
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no aaa new-model
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dot11 syslog
ip source-route
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ip cef
ip dhcp excluded-address 192.168.3.1 192.168.3.50
ip dhcp excluded-address 192.168.4.1 192.168.4.50
ip dhcp excluded-address 192.168.1.200
ip dhcp excluded-address 192.168.1.250
ip dhcp excluded-address 192.168.1.251
ip dhcp excluded-address 192.168.1.252
ip dhcp excluded-address 192.168.1.253
ip dhcp excluded-address 192.168.1.254
ip dhcp excluded-address 192.168.10.200
ip dhcp excluded-address 192.168.10.250
ip dhcp excluded-address 192.168.10.251
ip dhcp excluded-address 192.168.10.252
ip dhcp excluded-address 192.168.10.253
ip dhcp excluded-address 192.168.10.254
ip dhcp excluded-address 192.168.20.200
ip dhcp excluded-address 192.168.30.200
ip dhcp excluded-address 192.168.40.200
ip dhcp excluded-address 192.168.2.2
ip dhcp excluded-address 192.168.2.240
ip dhcp excluded-address 192.168.2.250
ip dhcp excluded-address 192.168.2.1
ip dhcp excluded-address 192.168.3.1
ip dhcp excluded-address 192.168.3.200
ip dhcp excluded-address 192.168.2.200
ip dhcp excluded-address 192.168.4.1
ip dhcp excluded-address 192.168.4.200
ip dhcp excluded-address 192.168.2.200 192.168.2.254
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ip dhcp pool DHCP-ADMIN
   import all
   network 192.168.3.0 255.255.255.0
   default-router 192.168.3.200
   dns-server 8.8.8.8
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ip dhcp pool DHCP-STUDENTS
   import all
   network 192.168.4.0 255.255.255.0
   default-router 192.168.4.200
   dns-server 8.8.8.8
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ip dhcp pool DHCP-SERVER
   import all
   network 192.168.2.0 255.255.255.0
   dns-server 8.8.8.8
   default-router 192.168.2.200
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ip name-server 192.168.2.2
ip name-server 8.8.8.8
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multilink bundle-name authenticated
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license udi pid CISCO2821 sn FHK1307F1JZ
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redundancy
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interface GigabitEthernet0/0
 no ip address
 ip nat inside
 ip virtual-reassembly
 duplex auto
 speed auto
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interface GigabitEthernet0/0.10
 encapsulation dot1Q 10
 ip address 192.168.10.200 255.255.255.0
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interface GigabitEthernet0/0.20
 encapsulation dot1Q 20
 ip address 192.168.3.200 255.255.255.0
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interface GigabitEthernet0/0.30
 encapsulation dot1Q 30
 ip address 192.168.4.200 255.255.255.0
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interface GigabitEthernet0/1
 ip address 192.168.2.254 255.255.255.0
 ip nat outside
 ip virtual-reassembly
 duplex auto
 speed auto
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ip default-gateway 192.168.5.200
ip forward-protocol nd
no ip http server
no ip http secure-server
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ip route 0.0.0.0 0.0.0.0 110.142.236.228
ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/1
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control-plane
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line con 0
 password tyson987
 login
line aux 0
line vty 0 4
 password tyson987
 login
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scheduler allocate 20000 1000
end