this post was submitted on 09 Jul 2025
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[Help] Advertise Hostname IP for 2 different Interfaces (LAN and Tailscale) (lemmy.world)
submitted 5 days ago* (last edited 5 days ago) by Coki91@lemmy.world to c/linux@lemmy.world
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Hello everyone, I have I guess a bit tricky situation on hand

I have 4 devices (2 computers, 2 cellphones) on my home network, they're all connected on the same LAN, and additionally, all are also running Tailscale (rather out of the box configuration except specific IPv4 addresses given by me)

When going out of home, I normally take up to 2 devices with me and connect to the ones at home through the Tailscale IP

Usually I do this by typing the IP address manually on either scenario, if I'm home I connect typing the LAN IP Addresses for the devices, otherwise I manually type the Tailscale IP addresses

I would like to now optimize this process using Host Names; I would like to type in say, SSH pc1 and that connect via LAN IP if available, and otherwise fallback to Tailscale IP if not

Result being I can just type the one singular host name, and connect successfully regardless if I'm home or not, also using the best possible connection (LAN preferred over Tailscale)

I am aware Tailscale has a feature that it does this out of the box using the Tailscale IP on the same LAN, but this doesn't seem to work on all devices (the phones) and additionally that generates some noticeable overhead given their age too

I have been reading about Avahi and thinking of using it on each device, advertising the same host name with both it's IPs, which I am yet to try but figured I could use more input on solutions if anyone has experience with it, I'd appreciate any

Thanks for reading, and I hope you have a nice day

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[–] MysteriousSophon21@lemmy.world 2 points 10 hours ago

You could solve this with a lightweight DNS server like dnsmasq on one of your home computers that stays powered on, it'll handle both LAN and Tailscale requests and can be configred to return the appropriate IPs based on where the request comes from - I've been using this setup for years and it works flawlessly.