Common IPv4 Routing Problems and Solutions

As I implied earlier in the chapter, Policy Routing grew out of several different needs within IPv4 networks. One of the more recent and prominent discussions was the entire topic of QoS. But there have been many problems with the destination-based routing structures. Some of you may remember that it was only recently, in the early '90s, that the Internet was allowed to carry any commercial traffic. Indeed there existed for some time parallel networks where one carried commercial traffic and the other carried Internet traffic. While this was a somewhat extreme and short-lived situation, there was call for and discussions about methods of differentially treating the routing based on the source of the ...

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