Hi guys,
I have an issue with my Proxmox server setup and hope you can help me to identify where this may come from. I already tried some articles from this forum, but none of them helped to solve my issue so far. Since I added two more disks to my Proxmox Server and restarted the server, I have the issue, that I can't pass vlans to host VMs anymore. Maybe there was an update activated by the reboot and as I thought it may be a bug, I updated Proxmox to 7.3.4. But the issue still remains.
On my Unifi Devices (Switch US-16-150, Firewall Unifi USG) I configured a port profile with native VLAN 100 and multiple tagged networks (VLANs 10, 20, 98,101,102, 103, 200) and assigned this profile to the port the Proxmox NIC is connected to. Within each network DHCP is activated, VLAN ID is assigned and fixed IPs of different network ranges (192.168.100.0/24, 192.168.101.0/24, etc.) are assigned to each host. To keep the troubleshooting simple, I reduced my current config in Proxmox to VLAN 100 (native) and VLAN 102 as an example.
In Proxmox I set up a Linux Bridge vmbr0 and set the flag "VLAN aware" and assigned this bridge to eno1 (the NIC were the Unifi port profile is assigned to). The vmbr1 holds the management IP and gateway, which is in native VLAN 100. Also I created for each VLAN an own Linux VLAN in my Proxmox network configuration. The VMs network device (virtio) is assigned to bridge vmbr0 and VLAN Tag is set, in this example to 102. Here is my current config of Proxmox network:
If I logon to a VM which should receive an IP from VLAN 102 the network adapter ens18 doesn't show any IP. When I run ifdown ens18 && ifup ens18, it tries to receive an IP via DHCP but fails after several attempts (message: No DHCPOFFERS reveceid).
When I remove the VLAN Tag from the VMs network config and run ifdown ens18 && ifup ens18 on the VM again, I receive immediately an IP of the native VLAN 100 network range.
Do I oversee something, do I have a wrong understanding or a mistake in my config? Problem could also caused by Unifi side, but I first want to check if my Proxmox network setup is correct.
I highly appreciate any hints or advice to improve my config, that VLANs and DHCP are available again.
Thanks, and kind regards
Michael
I have an issue with my Proxmox server setup and hope you can help me to identify where this may come from. I already tried some articles from this forum, but none of them helped to solve my issue so far. Since I added two more disks to my Proxmox Server and restarted the server, I have the issue, that I can't pass vlans to host VMs anymore. Maybe there was an update activated by the reboot and as I thought it may be a bug, I updated Proxmox to 7.3.4. But the issue still remains.
On my Unifi Devices (Switch US-16-150, Firewall Unifi USG) I configured a port profile with native VLAN 100 and multiple tagged networks (VLANs 10, 20, 98,101,102, 103, 200) and assigned this profile to the port the Proxmox NIC is connected to. Within each network DHCP is activated, VLAN ID is assigned and fixed IPs of different network ranges (192.168.100.0/24, 192.168.101.0/24, etc.) are assigned to each host. To keep the troubleshooting simple, I reduced my current config in Proxmox to VLAN 100 (native) and VLAN 102 as an example.
In Proxmox I set up a Linux Bridge vmbr0 and set the flag "VLAN aware" and assigned this bridge to eno1 (the NIC were the Unifi port profile is assigned to). The vmbr1 holds the management IP and gateway, which is in native VLAN 100. Also I created for each VLAN an own Linux VLAN in my Proxmox network configuration. The VMs network device (virtio) is assigned to bridge vmbr0 and VLAN Tag is set, in this example to 102. Here is my current config of Proxmox network:
iface lo inet loopback
auto eno1
iface eno1 inet manual
auto eno2
iface eno2 inet manual
iface eno3 inet manual
iface eno4 inet manual
auto vmbr0
iface vmbr0 inet static
address 192.168.100.11/24
gateway 192.168.100.1
bridge-ports eno1
bridge-stp off
bridge-fd 0
bridge-vlan-aware yes
bridge-vids 10 20 98 100 101 102 103 200
auto vmbr0.100
iface vmbr0.100 inet manual
auto vmbr0.102
iface vmbr0.102 inet manual
If I logon to a VM which should receive an IP from VLAN 102 the network adapter ens18 doesn't show any IP. When I run ifdown ens18 && ifup ens18, it tries to receive an IP via DHCP but fails after several attempts (message: No DHCPOFFERS reveceid).
When I remove the VLAN Tag from the VMs network config and run ifdown ens18 && ifup ens18 on the VM again, I receive immediately an IP of the native VLAN 100 network range.
Do I oversee something, do I have a wrong understanding or a mistake in my config? Problem could also caused by Unifi side, but I first want to check if my Proxmox network setup is correct.
I highly appreciate any hints or advice to improve my config, that VLANs and DHCP are available again.
Thanks, and kind regards
Michael
Last edited:
