Jio 4G - Strange public IPv4 address assigned behind NAT

varkey

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^ It will show the IP address in the About Phone --> Status section on Android when connected to 4G.

In Bangalore I still see the 10.x.x.x IP address on my phone, the above random public IP address thing is happening in Ernakulam, Kerala.
 

Sushubh

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I use this on my phone.

 

Nikhil Sharma

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I’m using an iPhone though. Sadly can’t see the IP. Will try on an Android device.

Nevermind: Got a soluchan.
 


varkey

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@Sushubh That is not what we want in this case. Jio is assigning random (as it appears) public IPv4 IP addresses (which is not even their own) to users behind NAT, so the publicly visible IP address would be Jio's and different from the one assigned to the device itself.
 


elepton

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Exactly, it's only a /29 so the number of unreachable hosts are just 8 or so. Plus it's all UK Defence department's so not somewhere I'd want to reach. 🤣🤣
The /29 subnet is an implementation bug; 3GPP data bearers are point-to-point links to the gateway. With slightly complicated routing rules, the only unreachable host would be the one with the same IP as yours i.e. 25.33.186.52.

You can do a traceroute to nearby IPs and subnets to see if packets are going to their actual destination or are getting routed inside Jio network.
 

elepton

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With slightly complicated routing rules, the only unreachable host would be the one with the same IP as yours i.e. 25.33.186.52.
And the other 7 IPs in the same /29 subnet because of the implementation peculiarity on Linux-based devices.
 
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