I would like to set up a couple of wireless modems in a mall but limit the access to wireless by 10MB per user.
Is there any good software I can use to manage this?
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the question is a bit ambiguous, but I'm assuming you mean share a single DSL (or similar) connection wirelessly via a number of wireless access points?
you would have to setup a captive portal of some sort to capture all traffic and force it through a login page to authenticate, and then measure the traffic using a radius server to keep track of total traffic in/out and killing the users connection when it hits a specific limit.
there are a couple of open source ways of doing this, I guess the one that comes to mind is pfSense - it's pretty good as a general control firewall and comes bundled with a captive portal (and has a module to install freeradius). Customization will be required, but you can do time and rate limiting out of the box with very little setup.