Trying to set IPv6 token, adding LXC options in container config file

[rsolva]

Context: I'm using an up-to-date rocky linux 9 container template on Proxmox 7.2-1.

What I'm trying to achieve is to set an IPv6 token for the container. I know this is possible, because if i add IPV6_TOKEN=::[TOKEN] to /etc/sysconfig/network-scripts/ifcfg-eth0 and do a systemctl restart NetworkManager, the container does get an IPv6 address with the correct token. The only problem is that the ifcfg-eth0 file is overwritten (not persistant) between boots.

When I try an ip token set ::[TOKEN] dev eth0 I get «Error: ipv6: Router advertisement is disabled on device.»

To fix this I tried enabling Router Advertisement for IPv6 by adding the following line at the bottom of /etc/pve/lxc/[CIDR].conf (host/proxmox):

lxc.sys.ipv6.conf.eth0.accept_ra: 1
# I also tried using '=' instead of ':'

But the lines are striped away from the config file when I start/stop the container. The wiki states that «It is possible to add low-level, LXC style configuration directly […]» and gives a few examples, so I guess this should be possible.

Does anyone know of a way to ensure that the IPv6 token is set permanently for the container?

 

[silverstone]

Late Reply but one Option might be to mark the File as something that Proxmox VE shouldn't touch.

I do this for /etc/resolv.conf inside a PiHole LXC Container, but I guess with the right Name it would work for anything.

File /etc/.pve-ignore.resolv.conf:

# https://forum.proxmox.com/threads/how-to-disable-auto-updates-of-etc-hostsname-etc-resolv-conf-maybe-others.76186/
# https://pve.proxmox.com/wiki/Linux_Container#_guest_operating_system_configuration
# DO NOT let Proxmox VE Update /etc/resolv.conf automatically

There is also a newer Discussion around, although not sure how well it works (didn't test it yet):

W

Thread 'How to setup Proxmox for IPv6 in my HomeNet?'

Oct 25, 2023

Hi there,
I have with the help of the great tutorials here but also on the Internet and Youtube set up the following setup.

You can see here my home network based on IPv4, which then edits the DNS server of my web hoster through a small php script and cron and thus also realizes an own dynDNS. Because now the dark time of the year has begun, I have set in my head my connection and the HomeNet also with IPv6 to provide. Unfortunately, my provider gives me only a dynamic prefix with IPv6 /56. After now 1 week of searching and reading, I still have not managed to realize a...

• Willi_H
• Replies: 12
• Forum: Proxmox VE: Networking and Firewall