Add darkfeline's change to set ifname if no interface is found.

Author: pborman

node.go

@@ -48,6 +48,7 @@ func setNodeInterface(name string) bool {
 	// does not specify a specific interface generate a random Node ID
 	// (section 4.1.6)
 	if name == "" {
+		ifname = "random"
 		randomBits(nodeID[:])
 		return true
 	}