Implemented support for UPnP

nat.go

@@ -0,0 +1,12 @@
+package eth
+
+import (
+	"net"
+)
+
+// protocol is either "udp" or "tcp"
+type NAT interface {
+	GetExternalAddress() (addr net.IP, err error)
+	AddPortMapping(protocol string, externalPort, internalPort int, description string, timeout int) (mappedExternalPort int, err error)
+	DeletePortMapping(protocol string, externalPort, internalPort int) (err error)
+}