Oh no not him again! I'm afraid so.
Replacement router is here from Netgear, Ubuntu laptop, Wired Desktop all have working internet connection.
Xbox 360 has an access point client configured which I can see is connected.
Trying to check network connections on the xbox 360 fails at MTU (min value of 1364 needed).
in cmd:
ping -f -l 1364
www.dslreports.comfragments until I lower the MTU to 1330 which is too low, now this has never been a problem so far.
I've upgraded firmware and checked using another router where I don't get this fragmentation until a much higher value. Currently it's set on 1400 on the Netgear router.
Plus I've also tried directly wiring the Xbox to the router with no luck there.
Any clues?
All of this is going to make me bald.