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什么是全锥型NAT?

全锥型NAT(Full Cone NAT)是一种网络地址转换(NAT)的类型。在全锥型NAT中,来自同一内部主机和端口的所有数据包都被映射为相同的外部IP和端口。外部的任何主机都可以通过这个外部IP和端口直接发送数据包到内部主机,而不需要内部主机先发送数据包到外部主机。这种类型的NAT允许外部主机更容易地与内部主机进行通信。

全锥型NAT与其他类型的NAT(如受限锥型NAT、端口受限锥型NAT和对称型NAT)相比,具有更高的可访问性,因为它不限制外部主机的访问,只要知道外部IP和端口即可进行通信。这使得全锥型NAT在某些P2P应用中更为理想,因为它简化了穿透NAT的过程。

然而,全锥型NAT的安全性较低,因为任何外部主机都可以尝试连接到内部网络的设备,这可能会带来安全隐患。因此,在选择NAT类型时,需要在可访问性和安全性之间进行权衡。

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