I am working in a small company with 70% of PCS and 30% Macs. Currently the place has got about 350 computers with 1700 users. Recently i used a special network monitoring software called wireshark to monitor the network. Wireshark gives me a clear p...

Currently I am having an ADSL2 connection which I share with four users. The download limit is 16G per month. Is there any way for me to alcate a certain amount per each user? ex: 4G per user

What are the best network monitoring softwares? Is there any free one for me to try? wireshark seems to be bit complecated to understand