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三层交换：汇聚接入层交换机 -
默认路由：实现到互联网数以万计网络访问的简化配置 -
静态路由：实现公司内部网络互通 -
NAT端口映射：实现企业内部Web服务器的发布
Switch(config)#hostname MS1MS1(config)#ip routingMS1(config)#interface vlan 1MS1(config-if)#ip address 192.168.1.252 255.255.255.0MS1(config-if)#no shutdownMS1(config-if)#exitMS1(config-if)#interface fastEthernet 0/1MS1(config-if)#no switchportMS1(config-if)#ip address 192.168.2.1 255.255.255.0MS1(config-if)#no shutdown
Router(config)#hostname R1R1(config)#interface fastEthernet 0/0R1(config-if)#ip address 192.168.2.2 255.255.255.0R1(config-if)#no shutdownR1(config-if)#exitR1(config)#interface fastEthernet 1/0R1(config-if)#ip address 61.159.62.129 255.255.255.248R1(config-if)#no shutdown
MS1(config-if)#ip route 0.0.0.0 0.0.0.0 192.168.2.2R1(config)#ip route 192.168.1.0 255.255.255.0 192.168.2.1
PC>ping 192.168.2.2Pinging 192.168.2.2 with 32 bytes of data:Reply from 192.168.2.2: bytes=32 time=0ms TTL=254Reply from 192.168.2.2: bytes=32 time=0ms TTL=254Reply from 192.168.2.2: bytes=32 time=0ms TTL=254Reply from 192.168.2.2: bytes=32 time=1ms TTL=254Ping statistics for 192.168.2.2:Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),Approximate round trip times in milli-seconds:Minimum = 0ms, Maximum = 1ms, Average = 0msPC>ping 61.159.62.129Pinging 61.159.62.129 with 32 bytes of data:Reply from 61.159.62.129: bytes=32 time=1ms TTL=254Reply from 61.159.62.129: bytes=32 time=0ms TTL=254Reply from 61.159.62.129: bytes=32 time=2ms TTL=254Reply from 61.159.62.129: bytes=32 time=0ms TTL=254Ping statistics for 61.159.62.129:Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),Approximate round trip times in milli-seconds:Minimum = 0ms, Maximum = 2ms, Average = 0ms
R1(config)#ip nat inside source static tcp 192.168.1.8 80 61.159.62.131 80R1(config)#interface fastEthernet 0/0R1(config-if)#ip nat insideR1(config)#interface f1/0R1(config-if)#ip nat outside
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原文始发于微信公众号（老五说网络）：通过端口映射技术将WEB服务器发布到Internet
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