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How come my browser knows to find "openmediavault.local" and how can I do that for other services like Radarr? (sh.itjust.works)
submitted 2 weeks ago by to c/asklemmy@lemmy.world
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So I recently got pisession kf a nas with OMV on it. That has a webinterface that I can reach from my laptoo via "openmediavault.local". But I never defined anywhere that that adress leads to the IP of my server. Better still, if I restart my server an DHCP gives it a new IP, "openemdiavault.local" still works.

How does that work? And can I make an andress like "radar.local" that automatically points to my radarr webinterface no matter hwat it's IP is?

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[–] 6 points 2 weeks ago*

I assume that your browser computer is set up to use mDNS, and that's how it's resolving it.

https://en.wikipedia.org/wiki/Multicast_DNS

Multicast DNS (mDNS) is a computer networking protocol that resolves hostnames to IP addresses within small networks that do not include a local name server. It is a zero-configuration service, using essentially the same programming interfaces, packet formats and operating semantics as unicast Domain Name System (DNS). It was designed to work as either a stand-alone protocol or compatible with standard DNS servers.[1]

mDNS uses IP multicast and User Datagram Protocol (UDP) packets and is implemented by Apple, Microsoft and most Linux distributions.

mDNS can work in conjunction with DNS Service Discovery (DNS-SD), a companion zero-configuration networking technique specified separately in RFC 6763.[2]

By default, mDNS exclusively resolves hostnames ending with the .local top-level domain.

Your browser tries to resolve it, browser computer sends out a multicast query to the local network, target "openmediavault" machine responds.

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