Several host providers I have used do this and it breaks OS stacks quite badly especially when containers and vnics are involved. From my own negative experiences with this (saying it's a 64 and configuring as a point to point) I wouldn't recommend doing this. Or if you are going to do it at the very least making it well know to your customers that this is the case.



On 25 April 2017 at 10:44, Michael Fincham <michael@hotplate.co.nz> wrote:
On Tue, 25 Apr 2017 09:26:45 +1200, Matthew Poole wrote:
> A /64 is definitely recommended as the maximum prefix length for any purpose, even point-to-point links.��
>
> I'm with you on finding this really disconcerting, but that paper lays out why you shouldn't go longer than /64 for your prefixes.

I would suggest for point-to-point links that folks register them in their IPAM as a /64, but
configure them on the equipment as a /127.

As far as I can tell, essentially all equipment supports this configuration, but you cut down your
exposure to various bugs and bad behaviours that have cropped up in the past (e.g. ping-pong and
friends).

Also stops people from being tempted to slip extra hosts in to what should be a point-to-point
link.

--
Michael

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