[SOLVED] Debian 13 LXC networking.service failed

I made these updates yesterday and now I can create an LXC without any further intervention! Like you, I tried calling setup_systemd_preset() to disable networking.service, but I discovered that it did not disable as intended. That's where I got stuck. I am glad that you were able to take the next step.
 
I was wondering if there has been any progress towards a more permanent solution? I don't want to upgrade all my debian containers to trixie to have to manually manage the networking from then on.
 
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I lost approx. 1h this evening with the Error dhcpcd[139]: eth0: ipv6_start: Cannot assign requested address.

Nothing worked. I tried Managed Host Configuration (checked), Unmanaged Host configuration (unchecked), DHCPv6, SLAAC, Static. Nothing worked.

In desperation and seeing this Post

A

[SOLVED] Post in thread 'LXC Container Will Not Start'

remark said:
Logs shows follows:
And then container failed to start.
Make sure you have no same MAC address on your host/CT/VM.
Click to expand...

So I stumbled onto the solution using your insight. Turns out that the MAC address used was unique, however it was typed in with lowercase letters. Changing to uppercase did the trick. Something I have never had a problem with before, but apparently it is a problem in this instance.

Thank you for your help!

(in my Case the MAC Address was already all uppercase though)

I just stopped the LXC Container & cleared the MAC Address for net0. That caused Proxmox VE to automatically generate a new MAC Address.

That did the Trick. After reboot, the error was gone, and I got all 4 IPv6 addresses (ULA, GUA_WAN1, GUA__WAN2, Link-Local) assigned now with DHCPCD :).

Currently the Configuration is still set to "Host-Managed" with Static IPv4 and Static IPv6 (in PVE Configuration Dialog), /etc/network/interfaces with only IPv4 enabled (as suggested by this Thread) and touch /etc/network/.pve-ignore.interfaces
 
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