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I am currently trying to use hostapd to create a 5GHz Wi-Fi network. I have tried using the adapter mentioned in this post from Newegg, but I had the problem referenced in the post (I have become convinced it is a problem with the adapter).

I am now looking for a replacement adapter but don't want to buy something that is not going to work again. The only requirements are that it work on both the 2.4 and 5 GHz ranges and have a removable antenna (part of the project involves boosting the signal).

I am currently looking at this Wi-Fi adapter. Does anyone know if this adapter or chipset (RTL8812au) will work using hostapd in the 5GHz band? And does anyone have a recommendation for a Wi-Fi adapter that meets these specifications?

1 Answer 1

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It's not the card, it's the configuration.

From your hostapd.conf:

hw_mode=g

802.11g is OFDM signaling up to 54Mbps in 2.4GHz specifically. It's the 2.4GHz version of 802.11a, which did the same thing in 5GHz.

channel=40

Wi-Fi channel 40 is a 5GHz channel. Its center frequency is 5.200 GHz. You cannot do 802.11g in 5GHz. If you want to do 802.11g-like signaling in 5GHz, it's called 802.11a. (Sorry for repeating myself.)

Your software even tried to tell you that in the error message:

wlan1: IEEE 802.11 Configured channel (40) not found from the channel list of current mode (1) IEEE 802.11g

If you still decide you want to buy a new adapter:
In my experience, the Wi-Fi chipmaker with historically the most vibrant open source community is Atheros (now "Qualcomm Atheros" or "QCA"). So look for adapters that use Atheros chips. You might want to use WikiDevi to help you look up which adapters use which chipsets.

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