Monitoring use of iMac wifi hotspot

Hi,

I'm using my iMac (2011 model with Mountain Lion) as a private wifi hotspot. Is there any way of monitoring how much usage it gets? Eg, active connections, bandwidth used, that kind of thing.

Thanks

I don't know if this is what you're looking for, but there's this app called 'surplusmeter' which monitors all types of connections going in or out.
Heres a link: http://www.skoobysoft.com/downloads/SurplusMeterv203.dmg

GL with that, Ibanezi