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How do they do it? How does carrier actually know that traffic is coming from tethered device rather than phone itself?
by KptMarchewa 6y ago
How do they do it? How does carrier actually know that traffic is coming from tethered device rather than phone itself?
- boomlinde 6y agoThe carrier can inspect TTL (or hop limit in IPv6) values which decrease with every hop, so TTL at the point your packet reaches the carrier is typically lower when you are tethering. Of course it is easy to circumvent by changing TTL on the terhered device from 64 to 65 or something like that, but I guess the solution is esoteric enough that carriers still make money doing crap like this.
- unixhero 6y agoThanks for the brilliant analysis. I didn't know this.
- toyg 6y agoin iOS the whole "mobile hotspot" feature can be disabled in carrier-locked phones.