Time Capsule: Wired connection works but cannot connect via wifi to net

Hi all,
I've had a Time Capsule for a year or so. I've been having problems with connectivity over recent months and I'm not sure where the issue is.
I have plugged in an ethernet cable joining my MBA to the TC, and another from the TC to the wall socket. I can access the internet without any problems.
However, if I unplug the ethernet cable from my MBA (or indeed if I don't plug it in in the first place) then I cannot connect to the internet. I can still back up to Time Machine etc., but nothing can get 'through' the TC.
Also, if I turn Mobile Data off for my iPhone, I cannot then access the internet via WiFi through the TC.
Any ideas as to how to fix this? The TC is in bridging mode, which has worked fine before. All suggestions welcome!

Ok.. let me try again..
Going back to your first post.
I have plugged in an ethernet cable joining my MBA to the TC, and another from the TC to the wall socket. I can access the internet without any problems.
However, if I unplug the ethernet cable from my MBA (or indeed if I don't plug it in in the first place) then I cannot connect to the internet. I can still back up to Time Machine etc., but nothing can get 'through' the TC.
When you plug in via ethernet the MBA works but not by wireless..
Now add that to the new info.
The campus network relies on each PC's individual MAC address and then assigns IP addresses as required;
Is the MAC address actually registered?? Because the MAC address of the ethernet port of the MBA and the MAC address of the wireless are different.
If the MAC addresses are not registered.. how does the Uni know the difference between a computer and a router??
You are not allow to run a router that feeds DHCP into the uni system.. but they cannot know what you have behind the MAC address of the item plugged in. A computer or a router.
So the TC has to be in bridging mode - which has worked perfectly well previously
Try releasing the MAC address to the PORT.. because the uni might have decided they don't want hubs connected either.. therefore the address of whichever device that is plugged into the wall is registered at the switch and will not allow a change for a fix period.. that is one way to stop people changing stuff around.
Try powering off the TC.. when you use another item.. or change from ethernet to wireless.. then power up the TC again and then power up the device .. eg the wireless on the laptop.. If it fails, it is not the TC that is causing it.. because in bridge the TC is completely dumb. It has no ability to control the MAC address being sent to the main router. None whatsoever.
If your TC recently upgraded to 7.6.4 firmware.. though.. well it can do all kinds of nasties.. flash it back to 7.6.1 and factory reset it.. and hope it works as it did before.. if not the uni changed the system to prevent your TC acting even as a hub.

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