I've seen variants of this question get asked a lot, but I haven't found a solution that works for me. Maybe that means it's not possible, but I want to confirm before I give up on it. I don't have much networking knowledge, so I'm sure that's limiting me in my search.
I have a docker container running on unraid v7.0.1 (network br0), and I want to be able to talk to a docker container (network host). I don't want every container on br0 to be able to talk to the host, just a specific one. "Docker custom network type" is ipvlan, and "Host access to custom networks" is Disabled. I know that that second option would allow me to talk to the host, but that would also let all my other containers do it as well, right?
I've seen some problems with macvlan in the past, so I'm not sure that is the right direction to go (but I've also seen mentions that those have been resolved). Any help or pointing me to better documentation would be appreciated! I would not only like to understand how to do it but also why it works that way, if that's possible. Thank you!