Just sticking this here in case it helps anyone. Recently updated my Eero mesh (got via Zen in the UK) to latest firmware and everything went to the zoo. Laptops couldn’t join at all, all other devices were dropping constantly. Zen checked the line which was fine.
At the same time a new network appeared – SSIDNAME_EXT. Never been there before. I went round isolating nodes and doing all sorts, including factory reset. No change.
Spent hours – literally over 4 hours – with Eero support trying a bunch of things including disabling 6e, using Google DNS, switching MLO off and even removing devices one by one. No change. And a play with ipconfig on the laptop showed that the main network and the EXT version were conflicting on handing out IPv4 addresses.
Anyway, guess what the problem was? In the eaves of the house we have a control unit for CCTV cameras and the guy that maintains them had put a TP Link extender in there so the feed could broadcast to the security app. It’s been that way for at least two years; never a problem.
Switched that off and unplugged it and hey ho, no more EXT and no more clashes. Everything seems stable and quick now though I’m still monitoring before we close the ticket at the Eero end.
So I guess the moral of the story is – firmware can change something that works into something that makes you want to commit atrocities. But if you’re playing detective look for things you might have forgotten all about because- until the update – they just worked.
Source: r/amazoneero · by /u/mckvlt