Wifi Packet Sniffer

Hi,
I am trying to find a solution to read the packet destination for an internet connection through wifi. I am able to do the same for a lan connection using packet sniffer example. But the same is not working for wifi connection.

Code:

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  mainSocket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.IP);

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The above code is used for LAN . what is to be done for Wifi Packet Sniffer

I found it that the connection for which i am trying to read packet is a WCDMA (PPP) type. Is there a way to read the destination ip originated from this type of connection