> You can move between multiple wireless APs in a conference hall, and have a layer-3 address that follows you as you switch network segments and thus acquire new layer-2 addresses (which means that the packets destined to that address are being dynamically re-routed at some upstream switch, as the address assignment changes.)
Is it possible to implement this at home, without paying a lot of money? I've tried it with UniFi AP (with software controller) and no luck :-(
For a house, you probably just want wireless range repeaters/extenders, or mesh APs like these (https://www.wired.com/story/best-mesh-wifi-routers/). Their key advantage being that the backhaul is wireless — you don't have to wire them back to the switch.
If you really want to do an "enterprise" wireless setup, and you want it to be cheap, well... you can buy the relevant equipment (802.11 enterprise wireless APs) used, often in bulk. Sometimes computer recyclers even have them!
Make sure you buy the stuff intended for office buildings, though, not the conference-hall open-plenum equipment. The conference-hall stuff is like studio lighting: powerful at a distance (five-storey hall ceiling down to you on the floor) at the expense of guzzling power and dumping tons of heat.
Also, obviously, unlike the home stuff, with the enterprise hardware, you do need to be able to run an Ethernet backhaul back to a switch somewhere, to join all these APs' L1 collision-domains into a common link-layer network segment. And that switch has to understand what it's doing, so you'd probably need something enterprise-y there, too, unless the state of open-source consumer router firmware has really caught up with enterprise.
Extenders works very badly, as they use 1/2 of bandwidth for themselves and need to be placed twice as often as APs. I have no problem to wire normal APs to switch, as I have several RJ45 sockets in each corner of each room :-)
Now I have one AP per room already, but can not implement seamless transition - when phone/laptop switches to other AP it requests DHCP again and drops all connections. It is very inconvenient.
I know "Buy Cisco's APs for $700/piece and controller for several thousand $$$", I wander why there is no open-source solution (hostapd & Ko), which "secret source" these enterprise solutions include, is it private technology or some open industrial standards, like 802.11[some obscure letter]?
Many expensive APs are built with Linux and hostpad inside, and still doesn't support this feature.
Is it possible to implement this at home, without paying a lot of money? I've tried it with UniFi AP (with software controller) and no luck :-(