Re: [DNA-BOF] BoF Last Call on DNA WG Charter/ Link ID.

[Alper Yegin <alper@docomolabs-usa.com>]

Hi JinHyeock,

<...>
> I have a question. Assume two 802.11 APs are one the same link and share
> one AR like below.
>                                              |
>                                          __|____
>                                        |            |
>                                        |   AR    |
>                                        |___  __|
>                         __________|__________________ _____
>                                   |                               |
>                               __|__                      __ |__
>                              | AP1 |                     | AP2 |
>                              |____ |                     |___ _|
> 
>                  
> Assume also a noce is attached to AP1. Will a node receive a different
> physical link ID if it changes an access point?

Yes.

<...>

>> If a network ID is available, the host can quickly determine if it has
>> changed subnet. If a network ID is not available, it has to play safe and
>> perform network-layer discovery to detect if it needs to reconfigure.
> 
> I have an another question. It's not clear to me what it means to a node
> changes subnet. 
> 
> Does that mean
> 1. A new Link-layer connection is established. or
> 2. The current default router is no longer reachable. or
> 3. The prefixes supported on a current link has been changed.
> 
> When all the above occurs, it's obvious a node has changed subnet. The problem
> is there may be an occurrence when some occurs while others not.

That's right. When network ID is available, host can tell whether subnet has
changed or not. When it is not available, then the host needs to perform
some tests.

Alper