/64 or /56 IPv6 on Kimsufi in 2025?

WhizzWr

Don't want to necro this old thread https://lowendtalk.com/discussion/27455/yes-you-can-use-the-whole-64-of-ipv6-on-ovhs-kimsufi/, so I made a new one.

I've always got /128 in my kimsufi, never /64.
The linked thread says it's possible to just assign some neighbour addresses and the upstream router will do its job... However, this blog (https://otacon22.com/2016/02/21/two-hosting-providers-ipv6-setups-compared-ovh-online-net/) stated OVH router is misconfigured.

I just want to get a delegated prefix and give some /128s to my Proxmox containers.

Any idea where to start?

A long time ago, I rented an Atom Kimsufi from OVH, and their support gave me a /56 with the disclaimer that it is an unsupported config.

Asking here since I can't think of a forum with more Kimsufi renters than LET😆

sillycat

@allthemtings any thoughts?

plumberg

I believe its /64
You should be able to use as many as you like

Try it. Shouldn't be a problem

WhizzWr

@plumberg said:
I believe its /64
You should be able to use as many as you like

Try it. Shouldn't be a problem

But is the routing OK wehen I assign it a /128 to each VM? I read the neighbour solicitation is broken so outbound connection is fine, but inbound is broken. Need NDP Proxy.

Do you have some experience?

plumberg

@WhizzWr said:

@plumberg said:
I believe its /64
You should be able to use as many as you like

Try it. Shouldn't be a problem

But is the routing OK wehen I assign it a /128 to each VM? I read the neighbour solicitation is broken so outbound connection is fine, but inbound is broken. Need NDP Proxy.

Do you have some experience?

Havent tried it.
From what I recall /64 is the routed so if you assign individual ones it should work out of the box.

Neoon

@plumberg said:
I believe its /64
You should be able to use as many as you like

Try it. Shouldn't be a problem

yis, I always configure them as /64.