# How can I receive Genicam packets from a device in a docker container?

I installed a command line tool which accepts genicam packets from a device as input into a docker image. If I use the option --network host in the run command for the container the packets are received. If I use -p 3956:3956/udp to expose the Genicam default port 3956 (e.g. stated here: RoboRealm - GenICam - Instructions) in the run command of the container I don't get packets. What did I wrong? Could the port be different from the default? How could I get the changed port then?

Because Genicam will actually use another 2 random ports to establish the connection. You are supposed to be able to force those to a specific value but that's not well documented. The way I tried to solve it was by creating a macvlan network. https://docs.docker.com/network/macvlan/

If you are networking with unfamiliar protocols Wireshark is always a good place to start. It lets you see every single packet that passes in/out/between your computer.