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OVH, Proxmox and IPv6
Hi,
i've bought a new Advanced server from OVH.
They provide me a /56 with the gateway on fe80::1
(this is a first for me; on the old servers, I got a /64 with a real gateway).
The main question is now:
how can I use this IPv6 in a VM?
I'm able to attache the IPv6 on the proxmox host - with the gateway. (on vmbr0)
But my VMs are not able to contact anything - except the IPv6 from the proxmox host.
I don't have any forwarding, etc. activated - since it was not needed (until now?) on the older systems.
Their FAQ only show the way for the solution with a gatweay 
Anyone here who can tell me how this OVH config should be done in a VM?
Thanks
Comments
You must turn your host into a router, and then route a subnet to each of your VM's interface.
Some update?
I got one KS-LE-E on BHS, with proxmox 8.3 and cant get more than 1 ipv6 working.
I use the same config of my past SYS server, and not working.
Some advice?
Thank you for contacting Low-End Support.
I just checked your server and noticed that you forgot to add
net.ipv6.conf.all.forwarding=1in /etc/sysctl.conf.Best regards,
The Low-End Support Team
I never tried as I don't use multiple IPs on my KSs, but this tutorial seems to work around a problem with Kimsufis and ipv6: https://lowendtalk.com/discussion/182736/basic-setup-of-proxmox-in-an-ovh-environment-kimsufi-example-with-nat-and-ipv6-enabled-containers/p1
Perhaps that's what you are looking for?
Thanks support team
Its active, not forget it
No working and dont know what happend, its not my first time with the same config
you need to setup ndppd or ndpresponder created by IPv6 expert @yoursunny
check this thread
https://lowendtalk.com/discussion/182736/basic-setup-of-proxmox-in-an-ovh-environment-kimsufi-example-with-nat-and-ipv6-enabled-containers
ndpresponder
edited my post
some options without "go" for debian ( proxmox ) ?
Compile once and upload the binary.
Go program is statically linked and works everywhere.
You don't need to install Go compiler on every machine.
@yoursunny
I tried another way, and if have multi ipv6 alias on vmbr0, they are working, without any other config ( proxmox just installed ).
means that my server´s ipv6 on ovh is routed?
I dont know now how to pass that ipv6 to VM
Their ipv6 is really weird. I removed eno1 from vmbr0 so that eno1 works like WAN and vmbr0 works like LAN, and setup SLAAC on my vmbr0.
On a few of my servers, the addresses inside vm wouldn't work at first. The gateway saw the outgoing packet and a new address but did not send NS and just ignored the it. It required an inbound connection to the address for the router to send an NS, which finally triggered an NA for that address via ndppd and made the address working. And then after a few reboots of my host, suddenly all the addresses started to work out of the box when I created new instances, but I still don't see any NS from the gateway and have no idea why it suddenly started to work like a routed prefix. I have limited knowledge about ipv6.
On some servers it works just like any normal onlink prefix. A vm sends a packet from a new address, the host forwards it out through eno1, the router sees the new address and sends NS, the ndppd on host replies with NA, and done the address is working.
Those are all kimsufi servers.
My eno1 is bridged to vmbr0, and on vmbr0 1ipv4, and there multi ipv6 working ( without ndppd or proxy active) . At the moment the only way that more than 1 ipv6 is working for me.
At your experience @zakkuuno ( i dont know so much about ipv6 and network config ), how can i handle or config ipv6 to vms ?
https://lowendtalk.com/discussion/comment/3567124/#Comment_3567124 This guide should be helpful for you.
If bridge works just stick to bridge? I don't bridge because Hetnzer would bitch about it and I'm used to the WAN-LAN setup, but I can't get it to work on OVH's network consistently either.