Proxmox VLAN + Unifi - VMs don't get IP when VLAN tagged

[Len]

Hello everyone,

Happy New Year!!

I know, not another VLAN in Proxmox thread! But I have genuinely tried to tackle this for the past 4 days and will detail below what I've tried in the hopes that it genuinely is something silly that I've overlooked.

Background

System versions:
Proxmox VE version: 8.0.3
Unifi OS: 3.1.16
Unifi Network: 8.0.7

The baremetal pc has 1 NIC that I'm using for the bridge, and to be VLAN aware

Here are the resources that I have tried and tested:

1. https://www.reddit.com/r/Proxmox/comments/15ijbbi/vlan_tagging_proxmox_unifi/
2. https://www.youtube.com/watch?v=ljq6wlzn4qo&t=692s
3. https://www.wundertech.net/how-to-configure-vlans-in-proxmox/
4. And the documentation source (which the above are also based on): https://pve.proxmox.com/pve-docs/pve-admin-guide.html#sysadmin_network_configuration


This is a simplified overview of what I'm trying to achieve (everything except the VMs sections are live and working):





Actual steps I have tried:

1. Enabled cross talk of the management vlan with all other vlans (via Unifi firewall settings)

2. Under port manager, for the port that the proxmox server is connected to, I have set the Native VLAN/Network to the management network (eg vLAN 10). And I have changed the "Tagged VLAN Management" setting from 'Block All' to 'Allow All'


3. Set my Proxmox linux bridge to be 'VLAN Aware' via the GUI, then tested a VLAN TAG id on a VM. But it keeps giving me the following network error and it wouldn't even get an ip address:




4. After restoring the interfaces file via the shell, I then tried editing the interfaces file according to resources links 1 & 4.

It looked like the below, then after I saved the file. I could no longer access the server remotely. I also checked on my unifi controller, it didn't even show up as being able to connect to it. So I logged in physically at the pc and then restored the back-up interface file I made




I don't know what else to try or what other settings to test or change?

Any help or guidance will be very much appreciated!

thanks in advance!
Len

 

[Len]

some additional info/testing I did:

The IP range that the VM's default to are on the management VLAN, ie they get assigned IPs like 10.0.10.138 etc.

If I DO NOT set a VLAN tag on the VMs, then it works, and the VMs get assigned an IP address and work as expected.
BUT, even if I assign it a VLAN Tag of 10 (ie, a range that I know it works as default), then it doesn't get assigned an IP address and it doesn't work

Which suggests that, as soon as there is a VLAN Tag in the network setting of the VM, it doesn't know what to do and can't even broadcast to receive an IP?

 

[Len]

I've also seen a few forums posts here which suggested to turn off all VMs, and reboot and then try assigning the vlan tags - that didn't work

also noticed a few other interface config files which had the netmask, so i added that as well, but still didn't work


I also noticed that my DNS, hosts and certificate were based on a previous IP that I had before changing it - so i updated those and forced renew the certs - tried all the above testing again - but still didn't work


I am using my onboard NIC, so wondering if that might be throwing up any issues?

I have an asus x79 deluxe. Looking at specs, these are the 2 nics:

running lshw - class network -businfo

I get the following:


The NIC that is being used in the linux bridge is enp10s0



EDIT - I did change the connected NIC to the intel one (And updated the linux bridge port reference) - removed the network device on the VM, tried again - but still didn't work!

 

[WarOriole13]

Wish I could help you however I am in the same boat and have tried the same steps as you. I am commenting in hopes somebody else can help

 

[jgross433]

I'm having the same issue. Migrating from a machine with dedicated NICs for each subnet to a mini pc with a single NIC and trying to make the bridge VLAN-aware. Nothing is working. Configurating a VLAN on the host itself works, however it doesn't seem to translate to the VMs.

 

[niekco]

Also having the same issue. Coming from ESXi and trying Proxomox. All works fine or even better, but VLAN's don't seem to work.

 

[niekco]

Solved my problem: Aruba instant on switch uplink port did not pass VLAN. After enabling, Proxmox VLAN's worked fine.

 

[Crashman]

In Unifi Network you could set the native VLAN for the USW Port the bare metal server is attached to and block all other VLAN. Using a static route for communication to/from IOT and PC in other VLAN via bridge cold be working?