two computers on same network cannot ping eachother nor view NetBios resources

I'd like to find out the problem of my network configuration

I have network configuration is like in this diagram:

The problem is between laptop1 and laptop2. At first I thought it was samba server problem. I was configuring samba server on one of the laptops and I wasn't able to access the shares from the second laptop no matter what I was doing. After installing/removing/configuring samba-server a couple of times I realized that the problem resides somewhere else.

Laptop configurations:

- Laptop1: ubuntu 12.04 
- Laptop2: Windows 7/ ubuntu 12.04 ( dual boot )
- Server : ubuntu 12.04

When I do "ping 192.168.0.10" from laptop2, I get "Destination host unreachable". The same situation is when I ping in other direction. When I access Laptop1 shares from Laptop2, having windows 7 loaded, I get the error message: "Error code: 0x80070035 The network path was not found."

When I ping "server" or "router" or "wifi router" from any of laptops I get a reply. The same with windows shares, I am able to access "server"s shares from Windows and Ubuntu, from any of my laptops.

Netbios can't function correctly, that's obvious, I am unable to access windows shares between laptops. I assume that on "wifi router" is a miss-configuration, but I can't find what specifically. The "Wifi router" works as Hub + wifi, it is connected to "router" not in WAN port but in LAN1.

Please, help me correctly configure the router to make them see each-other, or at least make NetBios work correctly, between laptops, to be able to access windows shares.

Thanks!

The router has client isolation turned on, prohibiting its WiFi clients from talking to each other. Just turn it off. If you specify the make, model, and firmware (if non-standard) of the router, we can tell you the exact location and name of this option.