Make Proxmox accessible on multiple vlans

[FesterJester]

I am sure this may have been answered somewhere already, I just have not found it yet.
So, I am going to start this post in the hopes that someone can help me while I continue to search.

I will try to explain my setup.

• VLAN1
  • 192.168.1.0/24
    • Router = 192.168.1.1
    • Proxmox = 192.168.1.10 (Proxmox version 8.3.5)
• VLAN10
  • 10.1.10.0/24
    • Router = 10.1.10.1
• VLAN20
  • 10.1.20.0/24
    • Router = 10.1.20.1

On the network switch:

• Router port
  • VLAN1 = untagged
  • VLAN10 = tagged
  • VLAN20 = tagged
• Proxmox port
  • VLAN1 = untagged
  • VLAN10 = tagged
  • VLAN20 = tagged

Right now, I have access to Proxmox from only VLAN1 and Proxmox is unable to reach devices on the other vlans.
My end goal:

1. Be able to access the web interface from at least VLAN10.
2. Proxmox can talk to devices on all VLANs.
3. Define which VLAN(s) a virtual machine or container is connected to.

 

[SInisterPisces]

Hello, there! The good news is this isn't hard once you know how to do it.

It's just not easy to figure out how to do it on your own.

I recommend this entire playlist for learning how to do things in Proxmox. A lot of the videos are for PVE 7, but they still apply to PVE 8. He assumes you don't know anything about the subject matter of each video, so they're great teaching tools.

https://www.youtube.com/watch?v=sHWYUt0V-c8&list=PLOUG593yAwIGuwYRdnACJaZEzOHMythiM

For your specific issue, watch the single NIC VLAN setup video all the way through. He covers adding IP addresses to different interfaces and virtual machines. For additional detail, he did a second video that also covers how to set up a LAG/bonded ethernet link. Even if you don't want to do that, I suggest watching both of them so you get a view of how the entire PVE network stack (minus SDN) works. I did, and it made everything much easier.

Single NIC VLAN setup: https://www.youtube.com/watch?v=ljq6wlzn4qo&list=PLOUG593yAwIGuwYRdnACJaZEzOHMythiM&index=3
Dual NIC in Bond VLAN setup: https://www.youtube.com/watch?v=nIip66Rzt4I&list=PLOUG593yAwIGuwYRdnACJaZEzOHMythiM&index=4

I'd suggest starting with getting the web GUI on whichever VLANs you want and making sure that works, before putting various LXCs and VMs into whichever VLANs you want.

Upstream, check the firewall rules on your firewall. Unless you've enabled the firewall in Proxmox at the cluster or node level, which is off by default, if you can't get to Proxmox across VLANs it sounds like there's an upstream firewall rule preventing inter-VLAN routing.