diff --git a/RNS/Interfaces/I2PInterface.py b/RNS/Interfaces/I2PInterface.py
index acd8a2c..9f3384e 100644
--- a/RNS/Interfaces/I2PInterface.py
+++ b/RNS/Interfaces/I2PInterface.py
@@ -829,6 +829,7 @@ class I2PInterfacePeer(Interface):
 
 class I2PInterface(Interface):
     BITRATE_GUESS      = 256*1000
+    DEFAULT_IFAC_SIZE  = 16
 
     def __init__(self, owner, configuration):
         super().__init__()
diff --git a/RNS/Interfaces/SerialInterface.py b/RNS/Interfaces/SerialInterface.py
index 89f73c6..0672ed0 100755
--- a/RNS/Interfaces/SerialInterface.py
+++ b/RNS/Interfaces/SerialInterface.py
@@ -42,6 +42,7 @@ class HDLC():
 
 class SerialInterface(Interface):
     MAX_CHUNK = 32768
+    DEFAULT_IFAC_SIZE = 8
 
     owner    = None
     port     = None
@@ -51,7 +52,7 @@ class SerialInterface(Interface):
     stopbits = None
     serial   = None
 
-    def __init__(self, owner, name, port, speed, databits, parity, stopbits):
+    def __init__(self, owner, configuration):
         import importlib
         if importlib.util.find_spec('serial') != None:
             import serial
@@ -62,6 +63,17 @@ class SerialInterface(Interface):
 
         super().__init__()
 
+        c = configuration
+        name = c["name"]
+        port = c["port"] if "port" in c else None
+        speed = int(c["speed"]) if "speed" in c else 9600
+        databits = int(c["databits"]) if "databits" in c else 8
+        parity = c["parity"] if "parity" in c else "N"
+        stopbits = int(c["stopbits"]) if "stopbits" in c else 1
+
+        if port == None:
+            raise ValueError("No port specified for serial interface")
+
         self.HW_MTU = 564
         
         self.pyserial = serial
diff --git a/RNS/Reticulum.py b/RNS/Reticulum.py
index 8acf5e0..0a071e0 100755
--- a/RNS/Reticulum.py
+++ b/RNS/Reticulum.py
@@ -615,39 +615,8 @@ class Reticulum:
                                     interface_post_init(interface)
 
                                 if c["type"] == "SerialInterface":
-                                    port = c["port"] if "port" in c else None
-                                    speed = int(c["speed"]) if "speed" in c else 9600
-                                    databits = int(c["databits"]) if "databits" in c else 8
-                                    parity = c["parity"] if "parity" in c else "N"
-                                    stopbits = int(c["stopbits"]) if "stopbits" in c else 1
-
-                                    if port == None:
-                                        raise ValueError("No port specified for serial interface")
-
-                                    interface = SerialInterface.SerialInterface(
-                                        RNS.Transport,
-                                        name,
-                                        port,
-                                        speed,
-                                        databits,
-                                        parity,
-                                        stopbits
-                                    )
-
-                                    if "outgoing" in c and c.as_bool("outgoing") == False:
-                                        interface.OUT = False
-                                    else:
-                                        interface.OUT = True
-
-                                    interface.mode = interface_mode
-
-                                    interface.announce_cap = announce_cap
-                                    if configured_bitrate:
-                                        interface.bitrate = configured_bitrate
-                                    if ifac_size != None:
-                                        interface.ifac_size = ifac_size
-                                    else:
-                                        interface.ifac_size = 8
+                                    interface = SerialInterface.SerialInterface(RNS.Transport, interface_config)
+                                    interface_post_init(interface)
 
                                 if c["type"] == "PipeInterface":
                                     command = c["command"] if "command" in c else None