Echo topic from a docker container from another machine in the same network

edit

I just came back to ROS after a long while and now I'm learning ROS2. My objective is simply to echo or see a topic broadcasted inside a docker container from Machine 1 to Machine 2. Machine 1 and Machine 2 are both in the same network. Some basic things I tried is adding the parameter of --net=host to spin up my docker container like the following:

Machine 1:

$ docker run -it --name ros2_container --net=host ros_foxy_image

Inside the container:

$ source /opt/ros/foxy/install/setup.bash

ros2 run demo_nodes_cpp talker

Machine 2:

$ source /opt/ros/foxy/setup.bash

I expect to at least see /chatter from using ros2 topic list however I only see /parameter_events and /rosout

Some context:

Machine 1 is a jetson_nano and I installed the foxy docker image as stated in their repos.

Machine 2 is running on a Ubuntu 20 VM with foxy installed from the debian package.

I can see the topics being broadcasted from Machine 1 just fine but I can't see the topics from Machine 2.