Re: [6lowapp] the role of gateway nodes

On Nov 27, 2009, at 4:00 PM, Carsten Bormann wrote:

> On Nov 27, 2009, at 15:37, Xavi Vilajosana Guillen wrote:
>
>> what's the approach at 6LowApp? anyone knows ongoing work on that  
>> issue?
>
> I would summarize the thinking that went into the BOF as follows:
>
> Some nodes in a CE (constrained environment) may actually be not  
> that constrained (as nodes and with respect to their network).   
> These can directly speak the appropriate application protocol (HTTP,  
> SNMP, XMPP, SIP) to some correspondent node outside (or inside) the  
> CE.  (We didn't put this on the slides because that is nothing new.)
>
> Some nodes may want to run the constrained application protocol  
> (called CoAP on the BOF slides) right to a correspondent node on the  
> outside.  See the bottom half of slide 13 in http://www.ietf.org/proceedings/09nov/slides/6lowapp-0.pdf 
>  as well as the use of CoAP inside the CE (if we had two CEs, this  
> also could be between CEs).
>
> In these two cases, no intermediary (above the IP layer) is involved.
>
> To connect constrained nodes that want to talk CoAP to correspondent  
> nodes outside the CE that want to speak established application  
> protocols, an intermediary is required.  We purposely tried to avoid  
> calling this a gateway, proxy, translator, server, or whatever,  
> because each of these seems to invoke some inappropriate  
> connotations of big hunks of hardware.  Instead we invented the name  
> CoGII (Constrained-node to General Internet Intermediary).  In a  
> 6LoWPAN, this could be the job of a device as simple as an Edge  
> Router, or it could be placed in a quite different position (as CoAP  
> is an Internet-based protocol, there is no restriction on the  
> placement of the CoGII).
>

Just a side note we may want to use the same terminology accross all  
WGs: 6LoWPAN refers to something specific, in ROLL we use LLN (Low  
power and Lossy Networks), I saw CEnet, ... how about using one  
terminology ?

Thanks.

JP.

> Gruesse, Carsten
>
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