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Lnternet联机数目自90年代以来迅速膨胀在IPv6尚未推广之前，IP地址短缺成为一个严重的问题。在TCP／IP，网关上通过准虚电路技术能一定程度上解决这一问题；．对其中基础技术网络地址转换与连接级服务代理进行了介绍，并对实现中的一些技术细节进行了阐述。
The Number of Lnternet Online Expansions Since the 1990s The IP address shortage has become a serious issue before IPv6 has been rolled out. On TCP / IP, the gateway can solve this problem to a certain extent by quasi-virtual circuit technology. The basic technology of network address translation and connection-level service agents were introduced, and the implementation of some of the technical details are described.