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Docker networking help (vlans)
(programming.dev)
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this post was submitted on 05 Apr 2026
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Thanks, that's a great write up. One thing I didn't ubderstand however is in your Docker macvlan, you set the parent to br0.10 and br0.20, where are those parents defined?
Maybe I misunderstood the macvlan documents but what I did was defining a vlan in server netplan vlan0.100 and set the macvlan parent to that vlan0.100. Is that not how it's supposed to be?
The .10 or .20 just advises Docker to create that specific Subinterface automatically. In my example
ip linkwill show new interfaces called br0.10 and br0.20 after creating the macvlan networks for VLAN IDs 10 and 20. You do not need to adjust your Netplan config when doing it like that. I would even assume that you are not allowed to define VLAN ID 10 and 20 in that particular case also in Netplan. I would expect that this will cause issues. Also see https://docs.docker.com/engine/network/drivers/macvlan/ in the 802.1Q trunk bridge mode section.There are probably multiple ways to do all of this, but this is how I did it and it works for me since a few years without touching it again. All VLANs are separated from each other and no VLAN has access to the LAN side. Everything is forced to go through tagged VLANs via the switch to the Firewall, where I then create rules to allow / deny traffic from / to all my networks and the Internet.
For me, this setup is very simple to re-implement should my Host go down. No special configuration in Netplan is needed. Only create the Docker Networks and start up my stacks again.