Tag Routing with TOS and fwmark
Of course using internal services and routing them differentially is great when you have access to a Policy Routing–capable system. But most of the server systems running over IPv4 today do not implement much of the basic IPv4 suite, let alone the advanced networking portions. There are several facilities available to deal with these types of systems.
The first facility that comes to mind is the QoS (Quality of Service) umbrella of protocols. Many of the items within this scope were originally intended to provide very specific types of routing and queuing services. But what is more interesting, and relevant to this discussion, is the design as a whole.
When you consider most of the various items commonly lumped ...
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