why the external ips are different in router and other sites of tests

Hi, nikil did you see the difference of external ip in both the figures. The first has 100 in router whereas 117 in websites, the ip we see it.
In the latest picture, i sent, you could see that both the router and external ip tally. in this connection, i asked the query , what could bnsl would have done it
 
I am not sure what you are trying to understand here. BSNL was testing something obviously and now they appear to have put you back in the original config.

A non publicly routable IP address ie 100.64.x.x as the WAN side IP address on the customer premises equipment would mean CG NAT being used. Now it being replaced with a publicly routable IP address mean, they have put you back to the previous configuration.

As to why they did that, we wouldn't know, the best guess is that it was for testing.
 
Nice reply. Would you say more on routable, non routable ips. is it non routable ip ,i.e., cg-nat.denotes the same Ips to more no of persons.
Is it also that if a computer affected or compromized in the case of a computer in getting more than one ip also affect the other computer logged on to the same ip.
What is actually cg nat. Please nikhil
 
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