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cmj

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Disclaimer

ALL CONTENT, WHETHER EXPRESS OR IMPLIED, ARE

OPEN INFORMATION. AUTHOR IN THE LEGAL IS

IRRESPONSIBLE FOR YOU.

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‧ Ba a maker, you can

‧ Learn more what you need

‧ Enjoy more what you like

‧ Understand more what you used

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Mission - Wifi AP

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‧ I want to design a popular WiFi AP

‧ Everyone want to access

‧ Everyone like to access

‧ Also, I’m happy everyone access my Wifi AP

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Design Flow

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I want access WiFi

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I want access WiFi

Your Wifi AP

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I want access WiFi

Your Wifi AP

Expose Your Device - hostapd

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I want access WiFi

Your Wifi AP

Expose Your Device - hostapd

Assign A IP address - dnsmasq

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I want access WiFi

Your Wifi AP

Expose Your Device - hostapd

Assign A IP address - dnsmasq

Access WLAN - iptable

‧ hostapd

‧ A userspace daemon for wireless AP

‧ dnsmasq

‧ Lightweight DNS / DHCP server

‧ iptable

‧ Redirect WiFi packet into WLAN

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So Easy ~

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‧ Now we have a basic WiFi AP

‧ But not sweet enough~

‧ Who ?

‧ Why ??

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‧ Now we have a basic WiFi AP

‧ But not sweet enough~

‧ Who ?

‧ Why ?

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‧ If possible

‧ Everyone on the World is my custom⋯

‧ But only the 100m at most, limit by

‧ frequency band

‧ radio power

‧ ⋯ etc

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‧ If possible

‧ Everyone on the World is my custom⋯

‧ But only the 100m at most, limit by

‧ frequency band

‧ radio power

‧ ⋯ etc

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‧ If possible

‧ I want only one (of course, mine) WiFi AP

‧ But WiFI AP is located on everywhere

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‧ If possible

‧ I want only one (of course, mine) WiFi AP

‧ But WiFI AP is located on everywhere

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So ⋯

The Trivial solution is Best solution

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If it looks like a duck, sounds like a duck, and walks like a duck, then it probably is a duck

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‧ In real scenario

‧ School, the total scope is larger than 100m

‧ You DO NOT want to repeat login.

‧ Did you realize that you switch to other AP

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WiFI Roaming

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‧ Limitation

‧ Same SSID

‧ Same Authentication method

‧ Same Password

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‧ But the real flow are

1. Client send probe request (with SSID)

2. Server response

3. Client authentication

4. Server check and pass the authentication

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‧ But the real flow are

1. Client send probe request (with SSID)

2. Server response

3. Client authentication

4. Server check and pass the authentication

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You are the Super Star

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‧ Be the popular, what can we get?

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You No Pain I No Gain

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You No Pain I No Gain

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Who get the router, they own the network!

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‧ Every packets through router

‧ From, To and Data

‧ Name, address, and everything you talk on the

network.

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Thanks for your attention ~

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