Extending a wireless network with OpenWRT.

One of my earliest covid-19 lockdown projects was doing a little work on my home wireless network.  I have a fairly nice wireless access point upstairs running OpenWRT, sitting behind the piece-of-shit DSL modem-slash-wireless access point our ISP makes us use.  All of our devices connect to that AP instead of the DSL modem.  Let's call it Upstairs.  However, the dodginess of the construction of our house being what it is (please don't ask), wireless coverage from upstairs isn't the greatest downstairs.  The fix for this, conveniently, is to set up another wireless access point downstairs and connect the two …

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