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1、在拓扑图上做端口网络地址转换NAPT 全网以互联互通！如有什么疑问去看上一篇文章（拓扑图）！接下来我们做NAPT 有VLAN2 VLAN 3的右边拓扑 作为内网！左边作为外网！允许VLAN2 192.168.2.0 这个网段 进行网络地址转换访问外网下面对Router2进行配置Router2Routerenable Router#configure terminal Router(config)#interface serial 2/0Router(config-if)#ip nat outside Router(config-if)#exitRouter(config)#interface
2、fastEthernet 1/0Router(config-if)#ip nat inside Router(config-if)#exitRouter(config)#access-list 1 permit 192.168.2.0 0.0.0.255Router(config)#ip nat inside source list 1 interface serial 2/0 overload（不用创建地址池，直接借用F1/0的IP地址，F1/0获取什么地址就使用什么地址。这样配置NAT超载就从5步骤变成4步骤，该方法同样适用于静态接入）用VLAN2 PC ping VLAN 5! 发现可以
3、ping通PCping 192.168.5.2Pinging 192.168.5.2 with 32 bytes of data:Reply from 192.168.5.2: bytes=32 time=219ms TTL=124Reply from 192.168.5.2: bytes=32 time=218ms TTL=124Reply from 192.168.5.2: bytes=32 time=172ms TTL=124Reply from 192.168.5.2: bytes=32 time=172ms TTL=124Ping statistics for 192.168.5.2
4、: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),Approximate round trip times in milli-seconds: Minimum = 172ms, Maximum = 219ms, Average = 195ms路由器上显示：Router#show ip nat translations Pro Inside global Inside local Outside local Outside globalicmp 60.12.3.5:16 192.168.2.2:16 192.168.5.2:16 192.168.5.2:16icmp 60.12.3.5:17 192.168.2.2:17 192.168.5.2:17 192.168.5.2:17icmp 60.12.3.5:18 192.168.2.2:18 192.168.5.2:18 192.168.5.2:18icmp 60.12.3.5:19 192.168.2.2:19 192.168.5.2:19 192.168.5.2:19icmp 60.12.3.5:20 192.168.2.2:20 192.168.5.2:20 192.168.5.2:20期末考试两篇内容已更新完成！希望对同学们有帮助，别挂科！
