LXC Container with VLAN Tag - No GW Connectivity

zimeon

New Member
Aug 11, 2025
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Hello,

I've been trying to figure this one out but simply can't. I have a bond0 interface on the proxmox host (Active-Standby), and a vmbr0 vlan aware linux bridge. I use the same vmbr for proxmox management on vlan 10.

1) I have three VMs on this same vmbr0 with vlan tag 20. All three VMs work and have network connectivity outside the host. In below output as tap adapters.
2) I create a Debian 13 trixie LXC container, using same vmbr0 with vlan tag 20. I can ping the other VMs on the host, but nothing works outside the proxmox host. Arp remains empty for the gw address.

I'm running proxmox 9.1.2, and my bridge vlan output looks as below;

# bridge vlan show vmbr0
port vlan-id
bond0 1 PVID Egress Untagged
10
20
vmbr0 1 PVID Egress Untagged
10
tap101i0 20 PVID Egress Untagged
tap102i0 20 PVID Egress Untagged
tap103i0 20 PVID Egress Untagged
veth104i0 20 PVID Egress Untagged


I've tried running as privileged and unprivileged container. Firewall and no firewall. Nothing seems to make a difference.... Any idea what to check next?
 
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