Measure bandwidth

I am sharing my internet connection. All of the computers connect through a basic SMC hub. I was wondering if there is some way for me to meter the bandwidth usage of all of the computer without installing client software on each one and without replacing the hub. Is there a way for me to sniff the packets to find the usage? I'm looking for easy to use software (doesn't have to be free). Thank you very much!!

 

 

 

 

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