I'm trying to implement peer-to-peer messaging and file sharing utility within LAN, So does WCF supports p2p? Does any one tried file sharing trough WCF?
Yes, it does. Please see How To Design State Sharing In A Peer Network:
When researching the various ways in which an election scenario might be implemented, I discovered that there is an attribute in WCF that allows you to indicate the maximum number of hops that a particular message will travel. After seeing this, it became obvious that there was a means for sharing state in a peer network that not only required no central server, but was resilient to node drop-off and did not require election. I call it Nearest Peer Synchronization.
Yes. Check out the NetPeerTCPBinding.
来源：https://stackoverflow.com/questions/2202301/does-wcf-supports-peer-to-peer-implementation