I am experiencing a very odd problem.

I am running KDE on a Lenovo T530 laptop with debian wheezy.

Wenn I connect it to my network (basically a fritzbox router) via cable everything is OK.
But when I connect via WLAN I get access to the internet, but I have no access to my router. A ping breaks with "no available host".
I also cannot ping to any address, neither IP nor named in the internet. But the browsers (FF, Konqerer) works OK.

I use static IP-Adresses at the moment, but even with DHCP-Server on, the problems persist.

I searched the net, but nobody seems to have a similar problem.

Any ideas are appreciated.

Edit: Maybe it's worth mentioning that I do not only have a dual boot setup with Win 7 (UEFI Legacy), but also have installed Gnome as a second DE. And I am currently using GDM.

When using a wired connection, access your router settings and check for a "isolated client" mode or similar. If present, it needs to be disabled.

Thanks for the advice, but neither mode changed anything.

But I found out, that the installation left an eth0 entry in /etc/network/interfaces. That seemed to collide with the networkmanager.
After commenting it out, everything is running smooth again.