This article deals with some problems existing in safety management of the users in Intranet and LAN,Local Area Network,and thereforeholds a discussion about how to confirm the sole user by discussing IP address, MAC address, Port and etc.

• 本文针对内联网、局域网中用户安全管理上存在的问题,从IP地址、MAC地址、端口等方面,对用户惟一性确定问题进行了一些讨论。