@anna just make sure what revision you're getting, don't remember off the top of my head which but there's a couple where, unless they ported new drivers, the 2.4ghz chipset doesn't work
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@anna misremembered, it's the 5ghz, and apparently only on the earliest hardware revision https://openwrt.org/toh/tp-link/archer_c7
@anna unrelated, i have a copy of Tannenbaum's "Computer Networks", huge tome, part of recommended reading for my university course. i graduated 4 years ago. never cracked it open