Linux手动连接配置wifi

Linux手动连接配置wifi
背景
以前在桌面端或是嵌入式手动连接过wifi，但没有深入也没有详细研究，今天系统地记录下。

wpa_supplicant连接WIFI
wpa_supplicant介绍及背景
官网：https://w1.fi/wpa_supplicant/.

以下来自man手册，介绍了它的作用、产生背景及由来，保持原汁原味。

wpa_supplicant - Wi-Fi Protected Access client and IEEE 802.1X supplicant

wpa_supplicant is designed to be a “daemon” program that runs in the background and acts as the backend component controlling the wireless connection. wpa_supplicant supports separate frontend programs and an example text-based frontend, wpa_cli, is included with wpa_supplicant.

Wireless networks do not require physical access to the network equipment in the same way as wired networks. This makes it easier for unauthorized users to passively monitor a network and capture all transmitted frames. In addition, unauthorized use of the network is much easier. In many cases, this can happen even without user’s explicit knowledge since the wireless LAN adapter may have been configured to automatically join any available net‐work.

Link-layer encryption can be used to provide a layer of security for wireless networks. The original wireless LAN standard, IEEE 802.11, included a simple encryption mechanism, WEP. However, that proved to be flawed in many areas and network protected with WEP cannot be consider secure. IEEE 802.1X authentication and frequently changed dynamic WEP keys can be used to improve the network security, but even that has inherited security issues due to the use of WEP for encryption. Wi-Fi Protected Access and IEEE 802.11i amendment to the wireless LAN standard introduce a much improvement mechanism for securing wireless networks. IEEE 802.11i enabled networks that are using CCMP (encryption mechanism based on strong cryptographic algorithm AES) can finally be called secure used for applications which require efficient protection against unauthorized access.

wpa_supplicant is an implementation of the WPA Supplicant component, i.e., the part that runs in the client stations. It implements WPA key negotiation with a WPA Authenticator and EAP authentication with Authentication Server. In addition, it controls the roaming and IEEE 802.11 authentication/association of the wireless LAN driver.

工具组成

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作者: Shell