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this post was submitted on 10 Aug 2023
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How do they detect that you are using a hotspot? Isn't the phone using NAT internally? Like, with NAT they don't know whether a request comes from your phone or from the hotspot
The carrier can look at the packets TTL and assume if it's not what they expect then it must have originated from another device via the hotspot. Verizon did, or maybe still does, use this to throttle hotspot traffic but not data originating from the phone.
This is correct. I pay for the unlimited plan with Verizon, but it only has 5GB of hotspot data. I use an
iptablesrule to increment the TTL by one, giving me unlimited data on my laptop.T-Mobile used to work the same way when I used it back in 2016.
Very nice. Unfortunately in Windows so no iptables for me. Nice to know this is possible...may have to see if I can do this with vbox or inside WSL.
Surely there is some way to configure this on Windows. I'm so unfamiliar with Windows software anymore, but I'm sure that any firewall worth it's salt would be able to increase the TTL on outbound packets.
I think on windows you can set that in the network driver options irrc. Either in the nic configuration or the ip stack config. I've at least seen it while I was diagnosing network issues a few years back.
iptables on your tethered machine or your android phone?
iptableson my laptop (not tethered, but using the phone's wifi hotspot). I don't even have a jailbroken android phone anymore because my banking app stopped working on custom ROMs and fighting with it wasn't a good use of my time.Doesn't that violate net neutrality?
I'm curious about this as well.
it depends on the carrier; (ime) most of the ones in north america use some kind packet encapsulation technique to find out if you request originated from a phone and auto reject it.