WiFi connected, cannot ping the home router

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Senior Member
Jun 24, 2012
Sometimes I am connected to the home network but with no internet access.
In terminal I tried to ping my router, but with no success. I can use wireless home network/have internet access from other devices at the same time.

If I turn off WiFi and I can reach the internet by mobile network.

Looks like the phone thinks that it is connected to the network but it isn't.
I have solved the problem by forgetting the network and afterwards connecting to it again, but I would like to know why and how it happened.