I’m in a shared apartment with a crappy router (French Orange Livebox) and I just discovered that because one of my flatmates can’t pick up the wireless signal in his faraway corner of the flat (and since we can’t move the router as it’s hooked up to the TV and phone nearby), he’s gone and surreptitiously installed some device plugged into one of the four wired ports, which channels the signal via the power lines and allows him to plug in an ethernet cable to the mains socket in his room. I didn’t even know such a thing existed, but anyway…
First I knew about this was last week when I can no longer send email from Thunderbird on a POP account (Orange enforce some policy of having to send emails from other providers via their own server smtp.orange.fr so whenever I’m at home I have to use that as the default outgoing server). I can receive okay but on sending I get a timeout error, and I’ve also found I can’t even access the login page of the router. In NetworkManager my connection still shows as the Livebox though my IP address has been displaced and gets constantly reassigned different numbers in the range x.x.x.10 to x.x.x.50, whereas previously it was always on x.x.x.10. I have another machine with a wired connection but I don’t use POP email on there.
The only way to resolve the issue is by going and pulling the lead out of this hidden box, and then everything is back to normal. Web browsing doesn’t seem obviously affected but I don’t know the potential impact on any other services, and don’t understand why email in particular gets blocked. Is anybody familiar with this sort of device and what can I do configuration-wise to stop it messing up my connection?