On 02/22/2017 09:41 PM, Lorenzo Colitti wrote: > On Thu, Feb 23, 2017 at 5:20 AM, Brian E Carpenter > <brian.e.carpenter@xxxxxxxxx <mailto:brian.e.carpenter@xxxxxxxxx>> wrote: > > Nobody is saying that /64 isn't extremely widely used where it's > appropriate to have a portable fixed length IID. Set the default > at 64 and trust operators to change it where they need to. > That's realistic. > > > As a host developer I strongly oppose that. It will make life easier for > network operators but make life harder for host OS developers, host > operators, and host users. > > And it is absolutely inappropriate to change this now in given that the > /64 boundary has been the standard for the last 20 years. It will break > deployed code that relies on the current standard. (That includes > concrete code I can point to that I know runs on tens of millions of > devices.) That's not acceptable to do in a standard reclassification. If the above will break your code, then your code is already broken. Fix it. Thanks, -- Fernando Gont SI6 Networks e-mail: fgont@xxxxxxxxxxxxxxx PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492