Wifi connected but no Internet topic

Hey I've a little problem and I'm almost thinking my device might be damaged.
I bought a tablet (blaupunkt polaris 803-android 4.4.2) and as mentioned above i can get access to my router but it won't let me download/upload anything.

When trying to connect to an open hot spot (my phone) I'll have the same problem.

I downloaded the app network signal info and it says following:

Ip : 192.168.0.1
Netmask: 255.255.255.0
Gateway: 192.168.0.1
Dhcp-server: 192.168.0.1
DNS1: 192.168.0.1
DNS2: 0.0.0.0
DHCP lease 168.00.00 (hh:mm:ss)
External ip: can not get external ip

I guess the last line might be the problem but I got no idea what to do...


All other devices (2 notebooks and 3 android phones can connect without problem to the router)


Hope someone can help?