IPv6 woes - RFC

Thu Sep 16 15:02:43 UTC 2021

Owen DeLong wrote:

>>> You mean anywhere in the world. Calls to my number reach my cell phone no
>>> matter where I go.
>>
>> You are confusing number portability and call forwarding.

> Not exactly… He is confusing number portability and roaming.

Wrong.

Mobility including, but not limited to, roaming (international
roaming of mobile phones is assumed) needs

	1) access foreign environment

	2) route packets to foreign network

Roaming today perform 1) by foreign network (often through
a chain of AAA) and 2) by home carrier as call forwarding, which
is very similar to IP mobility.

As we are talking about "Calls to my number reach my cell phone",
"call forwarding" is the most properly scoped explanation.

It should be noted that many on this thread misunderstand that
2) destroys route aggregation. However, call forwarding from
home carrier for roaming and mobility tunnel from home agent
for IP mobility is performed by end system without burdening
routing system of intermediate network and just scale.

Instead, many have wrongly assumed a poor alternative
to have a separate routing table entry for each mobile host
in global routing table, which does not scale.

							Masataka Ohta