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thanks for your reply. This is how it is defined in the docker compose file I used. AFAIK When using the internal network, the ports are exposed to an internal subnet and no port mapping is necessary.
no no internal: true mans the network is isolated from the outside and is irrelevant to needing port mapping or not, poet mapping is only needed to bring traffic into the docker virtual network
for my setup I have only one container with port mapping running traefik reverse proxying to my other sevices which use the external:true network because it is managed by the traefik docker compose file, in the traefik compose I do not say external: or internal: