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    • 32. 发明授权
    • Connection method, communication system, device, and program
    • 连接方法,通信系统,设备和程序
    • US09088547B2
    • 2015-07-21
    • US11572496
    • 2005-07-26
    • Nobuyuki EnomotoYouichi HidakaHideo YoshimiAtsushi IwataAkira Arutaki
    • Nobuyuki EnomotoYouichi HidakaHideo YoshimiAtsushi IwataAkira Arutaki
    • G06F15/173H04L29/06
    • H04L63/029H04L63/0272
    • A VPN connection method and a communication system are provided, each which can omit the setting of a firewall and the installation of a relay server and can establish communications from the outside of a firewall to the inside thereof. The internal network 2 is connected to the external network 1 via the firewall 13. The internal network 2 enables communications by an e-mail from the external network 1 (outside the firewall) to the mail server 21 in the internal network 2 (inside the firewall) or communications by telephone or radio, which is not via the firewall 3. The feature of the firewall 3 is utilized that access from the outside to the inside of the firewall through VPN connection is very difficult but the access in the reverse stream can be simply performed. Using the mail server, telephone line or radio line, the internal network 2 receives an e-mail, which requires for VPN connection from the external network 1, or control information through the telephone line. Thus, the internal network 2 sends callback for VPN connection to the e-mail transmission source. As a result, the callback allows the external network 1 to pass through the firewall 3.
    • 提供了VPN连接方法和通信系统,每个可以省略防火墙的设置和中继服务器的安装,并且可以建立从防火墙的外部到其内部的通信。 内部网络2经由防火墙13连接到外部网络1.内部网络2使得能够通过外部网络1(防火墙外部)到内部网络2中的邮件服务器21的电子邮件进行通信(内部网络2内部 防火墙)或通过电话或无线电通信,不通过防火墙3.防火墙3的特点是利用通过VPN连接从外部到内部的防火墙访问是非常困难的,但反向流中的访问可以 简单地执行。 使用邮件服务器,电话线或无线电线路,内部网络2接收需要来自外部网络1的VPN连接的电子邮件或通过电话线控制信息。 因此,内部网络2向电子邮件发送源发送VPN连接的回叫。 因此,回调允许外部网络1通过防火墙3。