docker/docs/behind-nat.md

Note if you use a Firewall / NAT

Kurento binds somehow always to the external IP instead of the local one or 0.0.0.0. For that reason you need to add your external IP to your interface.

Temporary way (until next reboot)

$ ip addr add 144.76.97.34/32 dev ens3

Permanent way

Specific to your linux distribution. Use a search engine of your choice. ;)

Ports

Also don't forget to forward all necassary ports listed in http://docs.bigbluebutton.org/2.2/configure-firewall.html