TSB Address space exhaustion(3/3) In 1995, classless system was introduced RiRs became more conservative with respect to address allocation Some believe ipya addresses will be exhausted in 2-3 years, others in 10 years others sooner others much later Rate of exhaustion influenced b technology(e.g NATing) and rir policies as well as growth Under-use of certain class a.b allocations
6 TSB Address space exhaustion (3/3) • In 1995, classless system was introduced • RIRs became more conservative with respect to address allocation • Some believe IPv4 addresses will be exhausted in 2-3 years, others in 10 years, others sooner, others much later. • Rate of exhaustion influenced by technology (e.g. NATing) and RIR policies as well as growth • Under-use of certain class A, B allocations
TSB Relationship to topology (1/3) An ip address is not similar to a telephone number An ip address is a routing address ° In telephony terms a telephone number is more like a domain name an ip address is more like a sanc
7 TSB Relationship to topology (1/3) • An IP address is not similar to a telephone number • An IP address is a routing address • In telephony terms: – a telephone number is more like a domain name – an IP address is more like a SANC
TSB Relationship to topology(2/3) But analogies are imperfect Telephone numbers identify a circuit, a wire going somewhere, but are now portable IP addresses identify a terminal device, a computer. but can be dynamically assigned translated (NATing)
8 TSB Relationship to topology (2/3) • But analogies are imperfect – Telephone numbers identify a circuit, a wire going somewhere, but are now portable – IP addresses identify a terminal device, a computer, but can be: • dynamically assigned • translated (NATing)
TSB Relationship to topology (3/3) Back to the basics of internet Any host can access any other host through uniform protocols and addresses · Network is dumb Intelligence at the edges applications independent of network Network does not change content These differences are more important than the packet vs. switched models
9 TSB Relationship to topology (3/3) • Any host can access any other host through uniform protocols and addresses • Network is dumb • Intelligence at the edges • Applications independent of network • Network does not change content Back to the basics of Internet: These differences are more important than the packet vs. switched models