diff --git a/network/connection_interface.py b/network/connection_interface.py
new file mode 100644
index 00000000..356c2aba
--- /dev/null
+++ b/network/connection_interface.py
@@ -0,0 +1,26 @@
+from abc import ABC, abstractmethod
+
+class IConnection(ABC):
+
+    @abstractmethod
+    def get_observed_addrs(self):
+        """
+        retrieve observed addresses from underlying transport
+        :return: list of multiaddrs
+        """
+        pass
+
+    @abstractmethod
+    def get_peer_info(self):
+        """
+        retrieve peer info object that the connection connects to
+        :return: a peer info object
+        """
+        pass
+
+    @abstractmethod
+    def set_peer_info(self, peer_info):
+        """
+        :param peer_info: a peer info object that contains info of peer
+        :return: true if successful
+        """
diff --git a/network/tcp.py b/network/tcp.py
new file mode 100644
index 00000000..e69de29b
diff --git a/network/transport_interface.py b/network/transport_interface.py
new file mode 100644
index 00000000..e69de29b