Comment 4 for bug 1763733

For sites that make use of fan networking, you need to return the fan address for containers to be able to interoperate with the other machines. My memory is a little bit hazy on the exact details, but for 2 application to interoperate where one is in a container and one is on the host machine, they both should use fan addresses in order to communicate.

We should certainly be consistent here, and it is unclear why one machine might return a fan address but not the other.

You should be able to disable fan networking entirely with model config
  container-networking-method: local
  fan-config: ""

With that setting, you won't be able to put applications into containers and have them accessible to the rest of the model, but you shouldn't get fan addresses anywhere.