[SOLVED] Linux VLAN Bridge Problem


New Member
Sep 7, 2023
Hello to the community,
I hope you are doing well.
I would like to explain the issue I've been facing for the past few days, and it's starting to become concerning.
To better understand the situation, I have created a small diagram:


In summary, currently, pve01 and pve02 can communicate with each other thanks to the configuration of their interfaces on Proxmox with VLAN. There is no firewall between these two machines.
However, when I create a virtual machine inside pve01, this virtual machine cannot even ping its gateway or its host.
I hope someone can help me resolve this issue.
Here is the network interface configuration file:

auto lo
iface lo inet loopback

auto eno49
iface eno49 inet manual

iface eno1 inet manual

iface eno2 inet manual

iface eno3 inet manual

iface eno4 inet manual

auto eno49.100
iface eno49.100 inet static
        post-up echo 1 > /proc/sys/net/ipv4/ip_forward

iface eno50 inet manual

auto vmbr0
iface vmbr0 inet static
        bridge-ports none
        bridge-stp off
        bridge-fd 0
        bridge-vlan-aware yes
        bridge-vids 100-100
        post-up ip route add via

Thanks for all !
Last edited:
Good evening,

After two nights of persistence, I've found the solution :)

Just recreate a vmbr with the vlan and leave the origin clean as a basic interface configuration.

Have a great evening, community! ;)


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