1. A few basic reminders

1.1 IP networks in general and routers in particular

IP networks (and, in particular, the routers that make them up) that are placed under the operating responsibility of a globally unique administrative entity within the Internet community (i.e., the notion of "global uniqueness" assumes that the administrative entity is duly univocally identifiable within the Internet community), constitute an Autonomous System (AS) (figure 1 ) or domain. From a topological point of view, an autonomous system is made up of a set of routers, and a distinction is made between the inside of the autonomous system and its outside. The outside of an autonomous system is...