Exposing port is not necessary

[pdumais]

Do you really have to expose ports using "-p" in docker run? You are using net=host, I think this would be unnecessary. Can you confirm?

[pedrxd]

If you use net=host is not necesary expose ports as it give the same network of the host to the docker. The question is why if you don't use net=host it doesn't work. What ports are necesary?

[dolchi21]

has anyone tried bridge network and mapping ports 50000-60000 for example?

[e2jk]

The cause seems to be that Multicast is needed.
See https://wiki.archlinux.org/index.php/ReadyMedia#iptables (ReadyMedia is the new name of minidlna)
Not sure yet how to enable that in Docker (seems like we're going to have an issue with the ttl, by default set to ! but needed to be set to 2 if the multicast packets are to be reaching inside the container?)