Reverse proxy?
(It's useful when you have only one Public IP on RED and you have at least 2 servers on ORANGE that use in the same time http or https (E-mail Server with Webmail and Web Hosting, ...). It's nice to do this from UI). - From here: http://community.nethserver.org/t/my-wishes-list-or-letter-to-santa/1840/14
Merry Christmas to all!