Address Management Challenges in 1992
Address space depletion
- IPv4 address space is finite
- Historically, many wasteful allocations
Routing chaos
- Legacy routing structure, router overload
- CIDR & aggregation are now vital
Inequitable management
- Unstructured and wasteful address space distribution
Notes:
Well-defined allocation policies are the basis on which APNIC manages address space and other Internet resources, on behalf of the entire Asia-Pacific region.
APNIC allocation policies must meet global objectives for managing the existing IPv4 address space. The considerations that led to the formation of these policies are as follows:
- The experience of classful addressing. This resulted in unsustainable routing table growth which threatened the future of the Internet itself. Aggregation summarises many routes into a single route and providing scalability as the overall number of routes announced decreases.
- Also as a result of classful addressing, internet routing was becoming increasingly unstable. Every local route adjustment was felt by routers across the whole Internet, and again aggregation allowed the effects of local changes to be limited, providing more stability globally.
- Finally, the existing IPv4 address space is finite. As a result, we need to take care that it is both efficiently and conservatively used