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Internet是由网络互联而成的网络,而实现网际互联的设备就是网关。任何用户都是通过网关连接到Internet的。Internet上的网关多数是专用的路由器和(三层以上)交换机,但也有为数不少的网关是由运行Linux/BSD的PC机配置而成,它们多兼有防火墙/NAT的功能。因为Linux和FreeBSD等系统都是在Internet上起源和发展的,与生俱来有强大的网络功能和丰富的网络应用软件,其TCP/IP栈的实现尤为成熟,Linux更是号称拥有业界最强的路由功能,加之两者都非常灵活、容易定制,所以深受资深网管和高水平用户的青睬。在一些中小型网络环境中得到了广泛的应用。
The Internet is a network of interconnected networks, and the Internet-enabled device is the gateway. Any user is connected to the Internet through a gateway. Most of the gateways on the Internet are dedicated routers and (Layer 3 and above) switches, but there are also a large number of gateways configured by PCs running Linux / BSD that have both firewall / NAT capabilities. Because Linux and FreeBSD and other systems are originated and developed on the Internet, born with a strong network capabilities and rich network applications, the TCP / IP stack is particularly mature, Linux is claimed to have the strongest in the industry Routing capabilities, combined with the two are very flexible, easy to customize, so by the senior network administrator and high level users favor. In some small and medium-sized network environment has been widely used.