Why is there private ip address in place of default gateway ip?

[WATER_the_life]

Thank you @vignesh_venkatesa to point in right direction. It is CGN . Now it is confirmed that BSNL using CGN because of less IPv4 addresses.

@varkey Thank you .You are right it is routing but it need more effort to do port forwarding.

Thank you @AgentX for trace result if possible check this link http://172.30.139.25:9090/ssssportal/ , is it show real time data usage ?

 

[varkey]

@WATER_the_life I'm not sure I follow, where is carrier grade NAT being used? I still get a public IP address and all sorts of port forward still work.

 

[WATER_the_life]

varkey , read the following link article

How to check if the ISP uses Carrier-grade NAT (CGN) | Remoterig.com,

As per my and AgentX trace results it shows private ip 10.x.x.x range so i conclude it but i am not expert so may be i am wrong , i am just curious to know change BSNL made . I haven't tested port forwarding as of now ,i may be wrong on port forwarding also.My real concern is real time data usage. BSNL officer told your internet is working so why do you go deep, in-place of solve it.So just trying to find solution by help of this forum.

 

[AgentX]

Thank you @vignesh_venkatesa to point in right direction. It is CGN . Now it is confirmed that BSNL using CGN because of less IPv4 addresses.

@varkey Thank you .You are right it is routing but it need more effort to do port forwarding.

Thank you @AgentX for trace result if possible check this link http://172.30.139.25:9090/ssssportal/ , is it show real time data usage ?

Port forwarding continues to work for me, this is not CG NAT. They're using private IPs for gateways only - you still get a fully routable public IPv4.

I can't get real-time data usage to work - it never worked for me though.

 

[varkey]

Yep, there is no NAT. This is just an internal routing related change.

 

[vignesh_venkatesan]

The Only time that I have seen a private ip as an gateway is the time when they disconnect the internet if you didn't pay the bill.
But I have never seen either a private ip allocation or a gateway in my ADSL connection. PING times here in Chennai is not very bad due to the location and presence of international gateways.
In your case I guess BSNL is either testing CGNAT or is in process of implementing a CGNAT on ADSL.
Maybe as it's in early stage it might be One to One NAT
I have seen CGNAT in Thier mobile 3G service as early as thier 3G launch.

 

[WATER_the_life]

Agentx , Ok fine so it is not CGN .

varkey sorry to question you but i am just trusting you as well that article ,learned my lesson. Careful next time.

vignesh_venkatesa thank you for clarification.