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?
To follow up on this, I’d look to network segmentation as another useful security barrier. I’ve just started playing around with VLANs, but the way I plan on setting things up is to have individual VLANs for services, management and IoT, with the LAN for all other user-land devices. On top of this you add strict firewall rules to what can talk to what, on which ports, etc. So all devices on the network can do DNS queries to my two DNS servers, for instance, but things from my services VLAN can’t reach anything outside of this VLAN…