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NAT-PT(network address translation + protocol translation)允许IPv6节点与IPv4节点之间进行通信.NAPT-PT则通过一定的映射方法以充分复用注册地址的所有端口,应用NAPT-PT模型,每个注册V4地址最多可建立63K从V6节点到V4节点的TCP会话和UDP会话.然而,对于从V4节点到V6节点的会话,每个注册IP地址只能映射到一个V6地址.当地址池中的地址耗尽时,V4节点不能再访问其他V6节点.ENAT-PT (enhanced NAT-PT)模型是对NAT-PT的改进.其主要思想是同时使用源地址、目的地址、源端口、目的端口来识别一个会话.ENAT-PT模型可通过一个注册地址同时建立大量从V4节点到V6节点的会话,在实际应用中对解决IPv4地址短缺问题具有重要意义.
NAT-PT (network address translation + protocol translation) allows IPv6 nodes to communicate with IPv4 nodes.NAPT-PT through a certain mapping method to fully reuse all ports registered address, the application of NAPT-PT model, each registration V4 addresses can establish up to 63K TCP sessions and UDP sessions from V6 nodes to V4 nodes.However, for a session from V4 nodes to V6 nodes, each registered IP address can only map to one V6 address.When addresses in the address pool Exhausted, V4 nodes can no longer access other V6 nodes.ENAT-PT (enhanced NAT-PT) model is an improvement on NAT-PT.The main idea is to use the source address, destination address, source port, destination port to identify A session. The ENAT-PT model can establish a large number of sessions from the V4 node to the V6 node through a registered address at the same time. In practical applications, it is of great importance to solve the problem of IPv4 address shortage.