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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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Can a server's eth & wifi share the same IP address? (lemmy.world)

submitted 11 hours ago by ReluctantMuskrat@lemmy.world to c/linux@lemmy.ml

18 comments fedilink hide all child comments

I'm running Linux Mint on a home server that happens to run pihole. Since it's both a dhcp and dns server for my network, it has a static ip address. It has an ethernet connection as well as wifi and it's always been my understanding that you can't have two network interfaces sharing the same IP address, so I've been looking into ways to have one network adapter enabled and the other disabled and then if the network connection of the active device is lost, the other re-enables with the same IP address and disables the other device. This mostly work.

However while debugging one bit of software that seems to have a problem with me disabling my wifi adapter, I inadvertently enabled both the eth and wifi connections while each have the same, manually assigned ip address and everything so far just seems to work. I didn't think this was possible and I'm wondering, should I expect problems? I can connect to the machine remotely fine, pihole and dvr services installed on the box work. Is there any reason to believe this won't work?

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[–] ReluctantMuskrat@lemmy.world 1 points 8 hours ago (1 children)

Will UDP packets produce an error when sent or will they simply be received twice, potentially causing errors/issues?

[–] pelya@lemmy.world 1 points 8 hours ago (1 children)

Nope. The server receives UDP packet from WiFi and sends reply over Ethernet, which simply gets lost in your router. From the Linux side there's no error, it sent the packet somewhere, and what happens next is your router's problem.

[–] ReluctantMuskrat@lemmy.world 1 points 5 hours ago* (last edited 1 hour ago) (1 children)

That's the thing about UDP packets... receipt isn't acknowledged as part of the protocol. It's send and forget. I'm not sure a UDP packet sent to my server would get lost but I'm not 100% certain there couldn't be situations where the packet is received by the server on both interfaces, essentially duplicated. It's been almost 30 years since I wrote programs that utilized UDP for communicating. I'm definitely a little rusty. 😄

[–] curbstickle@anarchist.nexus 1 points 5 hours ago

Unless its rudp.