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Configure iPhone to see cell Internet and local non-Internet LAN at the same time? (programming.dev)

submitted 4 months ago* (last edited 4 months ago) by CandleTiger@programming.dev to c/networking@sh.itjust.works

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I have an off-grid setup with a few devices on a local network that is not connected to the internet. I can tell my iPhone to use the non-internet wireless LAN to talk to those devices, OR I can tell it to use cellular data to talk to the Internet, but there’s no config on the iPhone side to let them be both live at the same time.

Is there any magic config on a wireless router e.g. certain DHCP settings or just disable DHCP, that will let the iPhone route to static 10.x IPs on the WLAN while the cellular internet is still active?

Any “advanced network settings” on the iPhone to manage multiple NICs?

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[–] catloaf@lemm.ee 6 points 4 months ago* (last edited 4 months ago)

I doubt this is possible, especially on iPhone. What are you trying to accomplish?

[–] Onomatopoeia@lemmy.cafe 6 points 4 months ago

That would be dual homing using both cell and wifi networking.

I don't think iOS can do this - and I'd be hard-pressed to make it happen on Android (honestly I don't think it can be done, maybe with root, even then, I'm not sure).

[–] vk6flab@lemmy.radio 3 points 4 months ago (1 children)

Set-up a cellular modem on your network and set your phone to WiFi?

[–] CandleTiger@programming.dev -1 points 4 months ago

😬

[–] possiblylinux127@lemmy.zip 2 points 4 months ago (1 children)

You would need to set your gateway to the cell service and then add a static route for your local subnet that points to the local WiFi.

[–] CandleTiger@programming.dev 1 points 4 months ago (1 children)

Yes, that l’s exactly what I’m asking for in this post — is there any actual exposed config on the iPhone, or any way to set up DHCP on the WiFi, that will convince the iPhone to use its own cell service as the gateway even while it’s connected to a WiFi?

[–] possiblylinux127@lemmy.zip 2 points 4 months ago

You can't do that with dhcp

[–] WolfLink@sh.itjust.works 2 points 4 months ago

You might be able to set something like this up if you turn on tethering