On Thu, Sep 28, 2017 at 11:08:19PM +0200, Eliot Lear <lear@xxxxxxxxx> wrote a message of 418 lines which said: > I have these questions: > > 1. If I wish to add a new DHCPv4 option as well as a similar DHCPv6 > iption, would that contravene the intent of this document? > 2. If I wish to add a field that would permit IPv4 addresses and IPv6 > addresses, would that contravene the intent of this document? For me, section 1 of the draft is crystal-clear "No IPv4-only feature will be added unless there's an equivalent feature added in the IPv6 version." Which means the answer is No to your two questions.