OK,
so to continue with my discussion, let's talk about IP addressing.
Known:
All RFC's and most International Internet access providers encourage the use
of hierarchical CIDR based IP addressing. This is for two main objectives,
save the Net from address exhaustion and the curse of IPv6, and to ensure
the core routers have enough memory to be able to continue forwarding
packets.
When a downstream customer moves from one provider to another, and his class
C network goes with him, his network is now added to the routing table as a
black hole, which increases memory utilisation in the core, one or two of
these is fine, but hundreds is not very acceptable to the upstream
providers.
Unknown:
- If a customer does move providers how long should they have before the
must renumber into their new providers space ?
- What size block of a providers space might be considered portable ?
- What steps can be taken to recover the address space if the customer does
not relinquish it ?
Arron Scott
Telecom NZ
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