Hardware possible to obtain Mac address of currently connected devices?

[Sketchy1]

Doing a project for class, and my cyber security teacher wants to start cyber attack lessons and junk. She set up her own router, and the task is simple, gain access.

Only catch is, we have to do it the SIMPLEST way possible. Now I was thinking it could just be a simple packet sniff for a Mac address then spoof my own (thus gaining access).

I can imagine my idea won't work, but in case it does, is it possible to get the Mac for all connected devices?

Edit:
It's an open network

 

[ScarletDreamz]

If the network is open, then you can simple connect to it and:

• search for the default username and password for the router.

or

• https://askubuntu.com/questions/406...ssociated-ip-addresses-in-my-local-network-la

 

[Sketchy1]

If the network is open, then you can simple connect to it and:

• search for the default username and password for the router.

or

• https://askubuntu.com/questions/406...ssociated-ip-addresses-in-my-local-network-la

Savage, I'll try this thanks

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Just in case the above dosent work, I'm still open to other answers btw