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Segregating Docker Services on Separate VLANs

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I have a question related to network segregation of Docker containers. Hopefully the picture below illustrates the issue.

I am using UniFi equipment on my network which is currently managed on default/native/unspecified/vlan1 VLAN. I have a pfSense VM (router/firewall) as well as a Linux VM on my Proxmox server that runs a couple of network related services in Docker containers.

Since one of these services is the UniFi Controller application I would like this (and I guess it makes sense) to communicate on the management network (vlan1). The other services I would like to have segregated on a different VLAN.

Considering Docker networks, host network configuration, hypervisor network configuration and/or firewall .... what is the best approach to this? I am not very familiar with messing around with iptables in Linux so hopefully there is a solution that stays clear of this unless it is straight forward.

enter image description here

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