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IPv6 (Internet Protocol Version 6) 1. Why IPv6 Exists (Fundamental Problem) IPv6 was designed primarily to solve one unavoidable limitation of IPv4: Address exhaustion IPv4 provides: (2^{32} approx 4.3 ) billion addresses That sounded huge in 1980. It’s trivial today. Key milestone Exhaustion officially recognized around 2011 (RIR depletion, e.g. RIPE NCC) 2. Core […]
IPv4 1. Historical Context and Design Philosophy IPv4 was formalized in 1981 in RFC 791, during a time when networking was transitioning from isolated systems to interconnected networks. It emerged from earlier protocols such as: NCP (Network Control Program) in ARPANET Early experimental internetworking protocols The central problem IPv4 solves is: How do we reliably […]