GNS3 : ping PC, but cannot ping gateway... on win7

GNS3 : ping PC, but cannot ping gateway on win7... 

I'm running GNS3 0.8.3 on windows 7 64 bits and I have a problem to access my gateway. 

The topology is very simple and I use all ip address within same network.. 

However, I am able to ping my pc from a router in GNS3, cannot ping gateway from the router. 

in order to solve the problem, follow up these steps... 

1. if you use wire NIC, 

 In Windows, go to Control Panel->Network and Internet -> Network and Sharing Center,

 click Local Area Connection Link of the connection to change 

 then choose 'Properties' button. Press the 'Configure...' button, 

 choose the 'Advanced' tab to modify 

• "IP V4 Checksum Offload" 
• "TCP Checksum Offload (IPV4)" 
• "UDP Checksum Offload (IPV4)"

 change the setting from "RX and TX Enable" to "Disabled" 

 so that the OS will compute the checksum. 

Note: I had to reboot my machine after the setting changes. 

Hope this works for you as it did for me!

2. if you use wireless NIC, 

watching the following video. 

  make the ms-loopback interface with ip address 192.168.137.1 

  and share the network between wireless network adapter and ms-loopback interface. 

  then, connect cloud to loopback interface. 

  Now, you can use a router within 192.168.137.0/24 network