Hi LordWigo,
just out of interest … what happens if you give a container the following parameters at the start command:
--net=bridge
This should cause Docker to start the container in bridge mode instead of NAT mode.
This should result in this container then being assigned an IP in the 10.0.0.X range by your router.
Then set rules on the router, which forward your desired ports TCP and UDP to the IP of your Docker container (10.0.0.X) on port 28967.
best regards
Vossi