I'm trying to understand what On-Prem gateways do.
1) It would seem that in this context, "On-Prem" means "Behind the firewall." I would assume an On-Prem gateway isn't needed if the server was already accessible via the internet, whether it's on premises or not.
2) What does the Gateway do? I'd assume it uses something like reverse tunneling to allow acces to the Dataverse applications for servers that are behind a firewall?
3) What hardware/software is required? I'd assume the Gateway has to be installed on a Windows machine that's always on? If the data source is Linux, and there are no Windows machines, does that necessitate installing a Windows machine just to serve as the gateway?