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Is there a way to have the same domain point to a local IP and remote depending on network? (halubilo.social)

submitted 2 years ago* (last edited 2 years ago) by [email protected] to c/selfhosted

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EDIT: Thanks for the info guys! Very excited to get this all set up

At the moment I have a bunch of self-hosting services hosted in the cloud. I plan to get rid of my cloud resources entirely and run stuff on some server hardware I acquired recently but my ISP doesn't give me a static IP and I'm behind a NAT or whatever it's called (the thing that makes multiple people's home connections be behind a single public IP) so I don't think I can even expose directly to the internet. So my plan is to have a very small and cheap server at a data center and proxy my actual server behind that.

My question is, is there a way that I can set things up so that the same domain can connect directly to the server when I'm at home, and to the proxy when I'm not? The difference would be what connection I'm connected to (my home WiFi vs 5G/others' WiFi). I'm thinking I could maybe run DNS on the server and configure my router to use that as a DNS server, but wouldn't my phone/laptop cache DNS entries? So it'd still try to connect to the local IP even when I'm out.

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[–] witten 1 points 2 years ago (1 children)

There's some great advice here on how to accomplish this, but a note of caution: If you're doing this split DNS on a device that you expect to be able to walk out the door with and continue working properly.. Some apps will cache DNS lookups even beyond the configured TTL. Meaning that a running app that thinks your server has a particular IP might stop working as soon as you walk outside of WiFi range and that IP is no longer reachable. And it might stay not working for quite a while. Ask me how I know this. :D

[–] [email protected] 1 points 2 years ago (1 children)

I feel like I know the answer already but how do you know this?

[–] witten 1 points 2 years ago

Because I tried this exact scenario with the Home Assistant app. Local IP for my HA server's hostname configured on my home router, public IP for the hostname elsewhere. I walk out my front door with the HA android app running on my phone, boom, loses connectivity to the HA server as soon as I'm out of wifi range and never recovers.. The local IP is no longer reachable and the app isn't smart enough to look up the new one.