this post was submitted on 11 Jan 2025
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I have a complex Tailscale-based network setup that includes blocking all Google hostnames. Unfortunately RCS on iOS doesn’t work when sending photos.

I’ve scoured AT&T’s website and App Privacy Report on iOS (which doesn’t show DNS names for Messages, Phone apps) but I do know they switched to Google as their RCS provider at one point.

I’d like to set up a Tailscale App Connector using hostnames, but if they’re using IP addresses I can work with those as well (subnet routing).

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[–] ptz@dubvee.org 18 points 1 day ago* (last edited 1 day ago) (2 children)

RCS is a whole can of worms. It's presented like a carrier services (and carriers are in the mix, though often just for authentication), but it's really a Google service. With Android, RCS connects directly to google's mothership.

I believe on iOS those go to Apple's servers which "peers" with google. Maybe search the RCS endpoint for Apple and see what comes up?

[–] kalpol@lemmy.world 4 points 7 hours ago

Sooo Google is getting a taste of all MMS pics now?

[–] undefined@lemmy.hogru.ch 5 points 1 day ago

Good point, I’ll be on the lookout for that.