On Wed, Apr 1, 2015 at 7:24 PM, Dave Crocker <[email protected]> wrote:
> In the first case, the version field is literally useless. It is wholly > redundant or worse insufficient, given that the receiver of the protocol > data unit sees the new stuff in other ways than the version field. > > In the latter case, it's really an entirely new protocol, which should > be identified by the next-lower protocol, rather than by using the > version field as an in-bred demultiplexing field. > > And yes, IPv4 and IPv6 are distinguished by different demultiplexing > values in the Ethernet frame: > > http://en.wikipedia.org/wiki/EtherType > This argues for creating a new thing that looks almost identical to DKIM, using a new header field name, that has this one extra property. That forces demultiplexing one pseudo-layer down. I think John produced a draft about that as well. I can't get my head around the "entirely new" part of that assertion though. -MSK
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