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If Nothing is Exposed, Am I Safe? (lemmy.dbzer0.com)

submitted 1 week ago* (last edited 1 week ago) by No_Bark@lemmy.dbzer0.com to c/selfhosted@lemmy.world

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Hello most excellent Selfhosted community,

I'm very new to this and am confused about how vulnerable my server and/or home network is with my current setup.

I just got a basic server up and running on a machine with proxmox and a DAS for 10tb of storage. I've got two LXCs running for a docker deployed arr stack and jellyfin+jellyseer stack. The proxmox server is connected to a router attached to a fiber ONT. Everything is accessed over the home LAN network and that's it.

Everything is working correctly and my containers are all talking to each other correctly via ip addresses (gluetun network on the arr stack container). I've been reading up on reverse proxies and tailscale to connect to the server from outside my LAN network, and it's mostly gone over my head, but it did make me concerned about my network security.

Is my current set up secure, assuming strong passwords were used for everything? I think it is for my current uses - but I could use a sanity check, I'm tired. I'm open to any suggestions or advice.

I own a domain that I don't use for anything, so it would be cool to get reverse proxy working, but my attempts so far have failed and I learned I'm behind a double NAT (ONT and router) - and attempts to bypass that by setting the ONT into bridge mode have also failed. I don't really need to access anything from outside my home network right now - but I would like to in the future.

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[–] 4am@lemm.ee 6 points 1 week ago

I had a double NAT setup like that. Run a firewall like OPNSense as a Proxmox VM, and give it a WAN interface on the ISP router’s IP range; then run everything else on a different subnet, using OPNSense as the gateway. On the ISP router, put OPNSense’s WAN IP in the DMZ. Then, do all your hardening using OPNSense’s firewall rules. Bonus points for setting up a VLAN on a physical switch to isolate the connection.

The ISP router will send everything to OPNSense’s WAN IP, and it will basically bypass the whole double NAT situation.