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 --------- To unsubscribe from nznog, send email to majordomo(a)list.waikato.ac.nz where the body of your message reads: unsubscribe nznog