IPv6 woes - RFC

Wed Sep 15 04:38:21 UTC 2021

Shane Ronan wrote:

> But in fact with local number portability, you cannot rely on the county
> code to tell you where to route a telephone call anymore.

Not. With geographical aggregation, you may route a call
*anywhere* in the destination country.

Geographical aggregation means carriers in a country is
required to have rich and robust connectivity between
them within the country as if the country is served by
a single carrier, which actually was the case with
ATT/PTT/NTT monopoly.

Then, whichever international carrier is chosen by the caller,
the international carrier looks up country-wise routing
table to reach the country. When the call reaches some
point in the destination country, the callee can be reached
relying on rich connectivity in the country.

Number portability database is looked up after the call
reaches the destination country, which will be used for
further intra-national routing, which do not affect
country-wise aggregation of international routing table.

But, as ISPs do not want to be regulated to have such rich
intra-national connectivity in all the countries,
geographically aggregated addressing is considered not
acceptable by operator community of the Internet.

						Masataka Ohta