Do your apps complain about SSL certs?

Traefik serves DNS challenge certificates

Nope. SSL certs are pinned to the hostname, not the IP address. I can change the IP address in DNS and it will still work.

Ahh, OK I see. I don’t know why I didn’t realize that before.

Would you have any recommendations to resources where I can read about setting something like this up? I’ve recently picked up a managed switch and set up a computer to act as a router, and I’ve been learning how VLANs be. I don’t have things fully working on my home network yet, though, but I’m very interested!

I’ll admit I dont have one.

I’ve been meaning to write one myself on how I use things. As how I’ve gotten it to work has really been from a decade of doing this professionally. And I have opnions.

I’ll for sure post links to this community when I have them.

I don’t know how the others set theirs up, but I use “views” in bind 9 kb.isc.org/docs/aa-00851

Essentially, the DNS I run on a router-like box much like you describe uses a different database depending on whether you query from an internal IP address or a public address. For me, the advantages are that I can let devices on my local network declare their own names to DHCP and enter them in DNS without worrying about the outside world. Mu internal network doesn’t crash if my ISP changes my address, Certbot happily requests certs for any site with a public address, and that cert works seamlessly on the corresponding internal address, no wildcards or DNS challenge required.

That’s so sick! That’s definitely above my skill level at the moment, but I will save this for when I’m more knowledgeable—thank you much!

What are you running on your router? If you use opnsense, I’m pretty sure it has a GUI for DNS stuff. Been a while since I’ve used it.

If you use pihole for DNS, you can set it up in there too, but it’s not the same process as most other systems.

I right now have an ISP router, but I’ve got an OpenWRT Pi5 and some Lenovo Tinys I can install OpnSense on when I know more things about stuff!

That’s exactly what I’m doing.

If you host your own internal dns server like a pihole, you can just add them in as local names.

Careful of something called split brain dns though.

For reference, I use AWS Route53 to host my dns domain publicly and internally I use pihole and Traefik. Traefik deals with getting certificates for my internal resources.

Thank you! I currently do run a PiHole, which I’ve been running for like six years? I really need to get that updated as well hahaha. I’ll look into doing it they way!

I’ve also got a completely different DNS config for WAN and LAN traffic. WAN devices can only resolve PTR records for my mail server. My LAN devices have DDNS so internally they a get allocated DNS entries by hostname. Even my guest network has a different config for isolation.

They definitely all need to be kept separate.

A router shouldn’t be sending that traffic outside. It should already have routes to send it right back, either regular or NAT rules.

It still has to hit the ISP router?

Depends on the IP. I have a static block, so the other IPs have to hit the public IP and come back, because the router doesn’t hold those IPs, itnjust forwards the traffic.