> BPL + ethernet maybe? At least you don't have to drill a hole.
> powerline is really bad
BPL is Broadband Power Line right? This house is wired with very
old copper wires (not twisted), I bet I would not get much out of
it, but thanks for the suggestion.

> Richard Miller's plan 9 image supports wifi on these machines.
> As of now there is no wifi dongle support in 9front. You can use an older Android phone's usb tethering (no cell service needed) with nusb/ether in rndis mode.
> i used to use an external wifi bridge over ethernet
These are all valuable options, thank you, but hiro is making me think:

> keep in mind wifi cannot really bridge more than one IP (sadly the
wifi src/destination fields cannot be mapped to ethernet mac addresses
properly).
Could you please expand this a little bit more (possibly with
references)?  I’ve attached to this email a little handmade diagram
of my home setup.  The line tagged with “long eth cable” was the
one that I wanted to replace with a wireless connection to some
receiver device that eventually ethernets with the switch, but still
I would have had to check what 802.11 is allowing me to do. What
you tell makes me think that that protocol in this setup in that
position is not really a viable option right?

> drilling holes is not so bad
Indeed, this is what I’m going to go for :D

Thank you very much for your help so far,
dan