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On 7/29/16 10:16, Joe Touch wrote:
>
>
> On 7/29/2016 7:52 AM, Theodore V Faber wrote:
>>> "Be liberal in what you accept, and conservative in what you
>>> send."
>>>> - RFC1122
>>>>
>>>> RFC760 puts it into exactly the context I indiicated:
>>>>
>>>> The implementation of a protocol must be robust. Each
>>>> implementation must expect to interoperate with others
>>>> created by different individuals. While the goal of this
>>>> specification is to be explicit about the protocol there is
>>>> the possibility of differing interpretations. In general, an
>>>> implementation should be conservative in its sending
>>>> behavior, and liberal in its receiving behavior.
>>>>
>>>> I.e., applies when there is ambiguity.
>> That's a remarkable interpretation of the "In general," prefix
>> that I simply disagree with. (And for the record, I agree that
>> the principle applies when there's ambiguity; I also think it
>> applies when there is none - it applies "In general".)
>>
>> Beyond the textual analysis, I think restricting that idea in
>> the (IMHO narrow) context of resolving specification ambiguity
>> sells it short.
>
> Can I then ask where you define the limit?
My limit is 3. In general.
The Postel Principle is an aphorism. A principle. Advice. I would
not even try to quantify this good advice (my limit is completely
facetious).
I'm not going to advocate ignoring IETF standards based on the words
of Jon Postel. If you look at my first message in this thread, you'll
notice that I castigated these implementers *based* *on* *that*
*principle*:
To say that another way: vendors who produce such devices [that make
assumptions about TCP option ordering] are failing to follow the
Postel principle.
In general, being conservative in what one sends implies following a
standard when one exists. Why are we trying to quantify our agreement?
- --
Ted Faber <[email protected]>
Engineering Specialist
Computer Systems Research Department
310-336-7373
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