Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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I only bind applications to ports on the Internet facing network interfaces that need to be reachable from outside, and have all other ports closed because nothing is listening on them. A firewall in this case would bring me no further protection from external threats, because all those ports have to be open in the firewall too.
But Linux comes with a firewall build in, so I use it even if it is not strictly needed with my strict port management regime for my services. And a firewall has the added benefit to limit outgoing network traffic to only allowed ports/applications.