[arm-allstar] BBB or RPi2 as a HUB?

[Mike]

I have 3 repeater sites that all have private internet access back to 
our primary internet site. Objective is to have all three repeater sites 
being able to access each other even if the main Allstar web sight isn't 
available. For example main fiber to us is cut but we still have a 
private link to the repeaters.  Would like for the repeaters to still to 
each other utilizing the hub if possible.
Can the BBB or RPi2 board at the primary internet feed  be used as an 
allstar hub for the 3 remote repeaters running on our private network?  
Also, is there any information that can give me what I need to do to 
make the hub?
Thanks Mike