Re: LL70: Use of the term "valid"

At 09:34 PM 5/18/2004 +0100, Philip Nye wrote:

>I think that the use of "valid" conveys meaning because it helps people 
>grasp the idea that a host may have been configured with an address which 
>was previously valid but although still configured, is no longer useable 
>because the network has changed (e.g. the host moved to a new network). 
>This is a common case and there is often good reason not to simply 
>unconfigure that address because the host may soon be moved back to a 
>context in which it is valid - meanwhile assigning an IPv4LL address 
>provides some connectivity.paragraph

I most emphatically do NOT wish to impede progress (in particular, since I 
have been an interested observer and not a contributor), but "valid" does 
not convey any meaning beyond what "routable" conveys. I understand your 
example and the difficulty caused by lack of normative text to 
reference---but I suggest you improve matters by adequately explaining what 
"routable" means in the context of your draft. I agree with Bernard that 
"valid" is white noise.

>The validity of a configured address is difficult to establish because the 
>context in which it is intended to operate or becomes invalid can vary. 
>Therefore I think that all we can do is explain the concept and present 
>the DNAv4 reachability test as a useful example (informative) rather than 
>a definition (normative) of validity.

Sounds like a good idea to me---but do it in the context of "routable" 
rather than "valid".


Regards,

Peter Johansson

Congruent Software, Inc.
98 Colorado Avenue
Berkeley, CA  94707

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