adhoc network administration

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http://askubuntu.com – I am a Computer Science student at mulungushi university in zambia. Our director for ICT as well as our networking lecturer encourages us to create networks in our rooms to practice networking topics like computer security, ethical hacking and network administration. I went ahead and created an adhoc network in Ubuntu 11.10 but i have questions on a few practices i would love to perform. is there a way i can: 1) how can i block torrents? (the guys are always downloading) 2) how can i block ip/mac addresses from the network. 3) what is the best tool for network monitoring (out-going and in- ()