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端口映射 NAT

端口映射 NAT. 网络地址端口转换 NAPT. 目前广泛采用的 NAT 技术 网络地址端口转换 NAPT ( Network Address Port Translation ) 通过 TCP 和 UDP 协议端口号以及 IP 地址来提供地址转换的映射 单一全局 IP 地址为多台内部主机同时访问外部主机提供支持。. 专用端口 13023 386 26600 1274. 扩展地址 128.10.19.20 128.10.19.20 207.200.75.200 128.210.1.5. 扩展端口 80 80 21 80. 协议使用 TCP

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端口映射 NAT

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  1. 端口映射NAT

  2. 网络地址端口转换NAPT • 目前广泛采用的NAT技术 • 网络地址端口转换NAPT (Network Address Port Translation) • 通过TCP和UDP协议端口号以及IP地址来提供地址转换的映射 • 单一全局IP地址为多台内部主机同时访问外部主机提供支持。

  3. 专用端口 13023 386 26600 1274 扩展地址 128.10.19.20 128.10.19.20 207.200.75.200 128.210.1.5 扩展端口 80 80 21 80 协议使用 TCP TCP TCP TCP 专用地址 10.0.0.5 10.0.0.1 10.0.2.6 10.0.0.3 NAT端口 14003 14010 14012 14007 NAPT转换表示例 • 转换前(10.0.0.5, 13023, 128.10.19.20, 80) • 转换后(G, 14003, 128.10.19.20, 80)

  4. NAPT的特点 • 采用单一的全局IP地址实现了多台内部主机同时的外部访问; • 保证了访问的普适性; • 局限性在于必须采用UDP或TCP协议用于端口映射。

  5. 本节结束

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