I’ve been running my server without a firewall for quite some time now, I have a piped instance and snikket running on it. I’ve been meaning to get UFW on it but I’ve been too lazy to do so. Is it a necessary thing that I need to have or it’s a huge security vulnerability? I can only SSH my server from only my local network and must use a VPN if I wanna SSH in outside so I’d say my server’s pretty secure but not the furthest I could take it. Opinions please?
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.