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网关是在使用不同通信协议、数据格式化结构、语言或体系结构的两个系统里,充当转换器角色的计算机系统或其它设备。网关和网桥不一样,网桥只在两个系统之间传递数据,不执行转换操作。网关重新打包信息,或者更改它的语法,使其符合目的地系统的要求。网关也可能是内部网络和外部网络的连接点。此设备从主机取出信息包,检查其地址,并把他们传递到下一个路由器或主机系统。网关包括: 电子邮件网关电子邮件网关把信息从一个供应商的信息应用转移到另一个应用,因此,网络里使用不同电子邮件网关把信息转换成
A gateway is a computer system or other device that acts as a converter in two systems that use different communication protocols, data formatting structures, languages, or architectures. Gateway and bridge are not the same, the bridge only transfers data between the two systems, does not perform the conversion operation. The gateway repacks the information, or changes its syntax to match the requirements of the destination system. The gateway may also be the point of attachment of the internal network to the external network. This device takes a packet from the host, checks its address, and passes them on to the next router or host system. Gateways include: E-mail Gateway E-mail gateways move information from one supplier’s information application to another, so networks use different e-mail gateways to translate information into