[How To] turn arch linux box to a wireless Access Point in the simplest way

Access point setting may be a little difficult for general linux user, I would like to introduce a one step way to use your linux box with a USB wifi dongle to change it to a wireless AP

1. Identify your USB wifi dongle support AP mode or not.
In order to turn your USB wifi to Access Point, your USB dongle must support AP Mode. you may check if it is supported by following:

$iw list
Wiphy phy1
    max # scan SSIDs: 4
    max scan IEs length: 2285 bytes
    Retry short limit: 7
    Retry long limit: 4
    Coverage class: 0 (up to 0m)
    Device supports RSN-IBSS.
    Supported Ciphers:
        * WEP40 (00-0f-ac:1)
        * WEP104 (00-0f-ac:5)
        * TKIP (00-0f-ac:2)
        * CCMP (00-0f-ac:4)
        * 00-0f-ac:10
        * GCMP (00-0f-ac:8)
        * 00-0f-ac:9
        * CMAC (00-0f-ac:6)
        * 00-0f-ac:13
        * 00-0f-ac:11
        * 00-0f-ac:12
    Available Antennas: TX 0 RX 0
    Supported interface modes:
         * IBSS
         * managed
         * AP
         * AP/VLAN
         * monitor
         * mesh point                  ...

 If you plug in your usb dongle and the Supported Interface modes do not have the "AP" mode, you need another usb module. Most likely for my personsal recommendation Atheros Chipset is a good choice.

2. Introduce to you a create_ap script. You may find it in the following link:
https://bbs.archlinux.org/viewtopic.php?pid=1269258

or from AUR
https://aur.archlinux.org/packages/create_ap/

Just install it and with the dependencies.

Just simply run a command

#create_ap wlan0 eth0 MyAccessPoint MyPassPhrase

And it is Done!! How come it is so easy.

There is a word for Chinese People "前人種樹後人蔭" "People plant trees, childen cools under tree"

Thanks for open source