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Absolute OpenBSD, 2nd Edition by Michael W. Lucas

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Bandwidth Management

One common task for a network perimeter device is bandwidth management. Network managers must control how much bandwidth is used for certain tasks, and must also reserve bandwidth for vital functions. If one of your minions loads the latest blockbuster comic book movie on the web server, you must be able to make an SSH connection to the server, find out why your server is overloaded, and fix the problem. PF includes the ALTQ bandwidth management system.

The most important thing to remember about bandwidth management is that you cannot control how much traffic other people send you. You can stop traffic at the point it enters your network. You can send hints that the bandwidth is saturated. You can arbitrarily restrict bandwidth ...

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