On 5/5/2015 10:23 AM, Larry Kreeger (kreeger) wrote:
...
>> IP is a protocol. v4 and v6 are versions.
>
> While I completely agree architecturally, when it comes down to
> implementations, the only downside I see are that it uses multiple Next
> Protocol code points.
Here are the primary downsides:
a) multiple codepoints at the top level
b) the need to continually add new codepoints for new versions
c) (and this is the big one)
NO savings in processing, in fact, it makes processing worse
Not only do you need to find the version (as codepoint or within the IP
header), but if you have the same information in two places you now need
to verify that the two match and decide what to do when they don't.
I.e., a person with one watch always knows what time it is; a person
with two watches is never sure.
There is simply NO utility in copying information that is equally easily
available and it ONLY invites error.
Joe
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