公开(公告)号：US07406079B2

公开(公告)日：2008-07-29

申请号：US10827371

申请日：2004-04-20

申请人： Yasushi Yokomitsu ,  Akio Yao ,  Toshiyuki Hamasaki ,  Hiroshi Konishi ,  Masahiro Shigyo ,  Yuji Mitsunaga ,  Kiminori Washitani ,  Hideaki Nagao

发明人： Yasushi Yokomitsu ,  Akio Yao ,  Toshiyuki Hamasaki ,  Hiroshi Konishi ,  Masahiro Shigyo ,  Yuji Mitsunaga ,  Kiminori Washitani ,  Hideaki Nagao

IPC分类号： H04L12/28

CPC分类号： H04L61/2514 ,  H04L29/12009 ,  H04L29/12367 ,  H04L29/12377 ,  H04L29/12462 ,  H04L29/12471 ,  H04L29/12924 ,  H04L61/2517 ,  H04L61/255 ,  H04L61/2553 ,  H04L61/6063

摘要： The present invention provides a repeater which automatically closes a dynamically opened port in accordance with prior setting, the repeater including: a port mapping table where a global IP address and an external port number, or an external port number on the Internet is associated with a local IP address and an internal port number of a terminal connected to a LAN; a control unit which, receiving a communications packet to which an external port number is specified, converts the external port number to an internal port number based on the port mapping table and transfers the internal port number to the LAN; a timer unit which counts the unoccupied time of the port after transferring a communications packet to which an external port number is specified; and a port management unit which checks whether the registered machine is present on the LAN and in case it is absent, deletes registration concerning the external port number from the port mapping table.

摘要翻译： 本发明提供了一种根据先前设置自动关闭动态打开的端口的中继器，所述中继器包括：端口映射表，其中全球IP地址和外部端口号或Internet上的外部端口号与 本地IP地址和连接到LAN的终端的内部端口号; 控制单元，其接收指定了外部端口号的通信包，基于所述端口映射表将所述外部端口号转换为内部端口号，并将所述内部端口号传送到所述LAN; 定时器单元，其在传送指定了外部端口号的通信分组之后对所述端口的未占用时间进行计数; 以及端口管理单元，其检查登记的机器是否存在于LAN上，并且在不存在的情况下，从端口映射表中删除关于外部端口号的注册。