Re: [DNA] Last call: Detection of Network Attachment (DNA) in IPv4(fwd)

[Brett Pentland <brett.pentland@eng.monash.edu.au>]

>>>3. Point of Attachment
>>>In DNA mailing list, we define a term "Attachment Point", which represents
>>>the link-layer connection.
>>>
>>>For example, assume the case of two 802.11 b APs and a router on the same
>>>ethernet link. Each AP is an Attachment Point and if a host moves from
>>>one AP to another, it has moved to a different Attachment Point.
>>>
>>>It's my impression that the "Attachment Point" from DNA WG and
>>>"Point of Attachment" from the draft doesn't mean the same thing.
>>
>>In the case above, I think that the AP would also be called a "Point of
>>Attachment", so they seem very similar.   I can change the document to say
>>"Attachment Point" instead.
> 
> 
> I might be mistaken. In the above example, I thought a router is the 
> "Point of Attachment" because of the definition below.  
> 
> Point of Attachment
>      A location within the network where a host may be connected.  This
>      attachment point can be characterized by its address prefix and
>                                                              
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^
>      next hop routing information.
>      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> If not, I see little difference and no need to change term. But it may 
> be of help to present an example of "Point of Attachment".

Yes, when I read this definition, I took it to mean the same as the term
"link" (using the definition of link in 2460).  Thus if two 802.11b APs
were connected through an Ethernet hub to a router, then regardless of
which AP a host associates with, it connects to the same "Point of
Attachment".  This is distinct from "Attachment Point" as we've
discussed it on this list (as JinHyeock points out) where each AP would
represent a separate "Attachment Point".

Brett.