I have just set up a network in Kenya which is driven by a cellular modem. I want to be able to measure data usage of the network as a whole, since the internet provider (Orange) can't provide any information as to when we are approaching the FUP cap. I also would like to be able to measure usage of individual machines to see if there are any heavy usage culprits. I am planning to put a server machine in but wondering whether I should make it Windows or Linux (or a Mac Mini) according to what the best monitoring tools are. Any suggestions please ?