Erik - thanks; I was not aware that "subnet prefix" is defined in RFC  
4291.  I'll read draft-wbeebee-on-link-and-off-link-determination with  
that definition in mind.

- Ralph

On Mar 11, 2008, at Mar 11, 2008,10:36 AM, Erik Nordmark wrote:
> Ralph Droms wrote:
>> I think the term "subnet" should not be used in this document, and   
>> should be replaced with "prefix" or "link" throughout, as  
>> appropriate.
>> "subnet" is not defined in any of the base IPv6 RFCs, as far as I   
>> know.  The term doesn't appear at all in RFC 2460.    Two  
>> instances  seem to have crept into RFC 4861, and four in RFC  
>> 4862.   Interestingly, some of those instances of "subnet" should,  
>> in my  opinion, be replaced with "prefix" and some with "link"...
>> ...which gets to my point that "subnet" is an imprecise term and  
>> can  have different meanings in different contexts.
>
> I agree that "subnet" by itself is underspecified; in some cases it  
> should just be a prefix. I don't think this document uses subnet" to  
> mean "link".
>
> However, I do think we should refer to "subnet prefix" in some  
> places. If nothing else to make it easier for folks with an IPv4  
> background to understand what we are talking about. The "subnet  
> prefix" term is specified in RFC 4291 (the addressing architecture)  
> thus I don't think need to completely purge it.
>
> In this vein I think it might make sense to expand the title of the  
> draft to:
> IPv6 subnet model: the relationship between links and subnet prefixes
>
>   Erik

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