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I have a Raspberry Pi 3 B+, with the built-in wifi adapter (wlan0).

I wanted to have another USB Wifi adapter (Alfa AWUS036AC) attached to it, and connect to the same network. I followed the tutorial here, and (wlan1) is up successfully.

However, after doing so, the in-built wifi adapter is down.

I want a Pi router - so, one adapter serves as an access point, while the other is connected to my home router. Nevertheless, I'm curious as why wlan0 is able to connect at the start with /etc/network/interfaces being empty.

So, I have 2 questions:

  1. What could have caused wlan0 to be down?

  2. I realised that at the start, /etc/network/interfaces is empty. So, how is it possible for wlan0 to connect to the network successfully? For wlan1 to connect, I have to modify this file.

  • Why would you want to connect two adapters to the same network? – T. M. Jan 20 at 13:37
  • I want a Pi router - so, one adapter serves as an access point, while the other is connected to my home router. Nevertheless, I'm curious as why wlan0 is able to connect at the start with /etc/network/interfaces being empty. – Kyoma Jan 20 at 13:41
  • The point of a router is that it routes between different networks. I can't answer the question about the config file. What happens when the usb adapter isn't connected? – T. M. Jan 20 at 13:58
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    You are asking the wrong questions. Better you ask: "How can I configure a wifi repeater?" Answers to your question will not help you to get a wifi repeater. – Ingo Jan 20 at 14:31

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