Hi @luisbauti92,
Part of the response is in this https://github.com/kobotoolbox/kobo-docker/issues/251. kobo-docker does not support IP addresses (anymore), and so does kobo-install.
If you choose to install on a workstation, domain names will be added to your /etc/hosts to let your browser recognize them.
When it’s installed in server mode, it assumes that domain names are publicly accessible (even if it’s only on a local DNS).