基於OpenWrt平台上IPPnP閘道器之實作

Abstract

在今日，越來越多的使用者透過行動裝置使用無線網路。越來越多的咖啡廳、學校、飯店以及其他業者提供無線上網的服務。在咖啡廳和商店這類型小型無線熱點的服務中，透過本論文提出的存取控制閘道器來維持無線網路的服務是一個好的解決方案，因為它成本低且方便管理。即使是學校這類型較大規模的無線熱點，也可透過多個存取控制閘道器搭配WiNOC管理系統，達到理想的網路服務品質。 本篇論文描述如何在OpenWrt平台上實作一個無線網路熱點的存控制閘道器。此存取控制閘道器具有(1)RADIUS client功能可與RADIUS server溝通；(2)captive portal機制控管使用者；(3)DDNS client功能方便連結這些動態IP位址的機器。除此之外，為了讓使用者可以更方便迅速的存取網路，此閘道器也加入IP Plug and Play的功能。

Wireless Networks have been widely used by people with mobile device or laptop nowadays. There are more and more coffee shops, universities, hotels, and other business that provide services of accessing the Internet via wireless LAN. In the small-scale hotspot, like coffee shops and store, using common access gateway to provide service will be a good choice because of low cost and ease to construct. In this thesis we will describe how to implement a wireless hotspot access control gateway under the OpenWrt platform. This gateway will have (1) RADIUS client to communicate with RADIUS server, (2) captive portal mechanism to strengthen access control, (3) dynamic DNS client to be easily connected and managed without the inconvenience of dynamic IP address. And it will also have SSH connectivity and web page GUI to be configured and managed via Internet. In addition, IP PnP (IP plug and play) will be in the gateway for convenience of use.