diff --git a/RNS/Interfaces/AutoInterface.py b/RNS/Interfaces/AutoInterface.py
index c20d553..7d62f13 100644
--- a/RNS/Interfaces/AutoInterface.py
+++ b/RNS/Interfaces/AutoInterface.py
@@ -33,6 +33,9 @@ import RNS
 
 
 class AutoInterface(Interface):
+    HW_MTU = 1196
+    FIXED_MTU = True
+
     DEFAULT_DISCOVERY_PORT = 29716
     DEFAULT_DATA_PORT      = 42671
     DEFAULT_GROUP_ID       = "reticulum".encode("utf-8")
@@ -103,8 +106,7 @@ class AutoInterface(Interface):
         super().__init__()
         self.netinfo = niwrapper
 
-        self.HW_MTU = 1064
-
+        self.HW_MTU = AutoInterface.HW_MTU
         self.IN  = True
         self.OUT = False
         self.name = name
diff --git a/RNS/Interfaces/Interface.py b/RNS/Interfaces/Interface.py
index 57bc989..ccf92b8 100755
--- a/RNS/Interfaces/Interface.py
+++ b/RNS/Interfaces/Interface.py
@@ -65,6 +65,7 @@ class Interface:
     IC_HELD_RELEASE_INTERVAL = 30
 
     AUTOCONFIGURE_MTU = False
+    FIXED_MTU         = False
 
     def __init__(self):
         self.rxb      = 0
diff --git a/RNS/Resource.py b/RNS/Resource.py
index f66b634..afff68c 100644
--- a/RNS/Resource.py
+++ b/RNS/Resource.py
@@ -185,7 +185,7 @@ class Resource:
             resource.window_min           = Resource.WINDOW_MIN
             resource.window_flexibility   = Resource.WINDOW_FLEXIBILITY
             resource.last_activity        = time.time()
-            resource.started_transferring = self.last_activity
+            resource.started_transferring = resource.last_activity
 
             resource.storagepath          = RNS.Reticulum.resourcepath+"/"+resource.original_hash.hex()
             resource.segment_index        = adv.i
diff --git a/RNS/Reticulum.py b/RNS/Reticulum.py
index 0b6d9f9..1ff7562 100755
--- a/RNS/Reticulum.py
+++ b/RNS/Reticulum.py
@@ -90,7 +90,7 @@ class Reticulum:
     the default value.
     """
 
-    LINK_MTU_DISCOVERY   = True
+    LINK_MTU_DISCOVERY   = False
     """
     Whether automatic link MTU discovery is enabled by default in this
     release. Link MTU discovery significantly increases throughput over
diff --git a/RNS/Transport.py b/RNS/Transport.py
index fcff7a1..8954a84 100755
--- a/RNS/Transport.py
+++ b/RNS/Transport.py
@@ -1336,7 +1336,7 @@ class Transport:
                                         RNS.log(f"No next-hop HW MTU, disabling link MTU upgrade", RNS.LOG_DEBUG) # TODO: Remove debug
                                         path_mtu = None
                                         new_raw  = new_raw[:-RNS.Link.LINK_MTU_SIZE]
-                                    elif not outbound_interface.AUTOCONFIGURE_MTU:
+                                    elif not outbound_interface.AUTOCONFIGURE_MTU and not outbound_interface.FIXED_MTU:
                                         RNS.log(f"Outbound interface doesn't support MTU autoconfiguration, disabling link MTU upgrade", RNS.LOG_DEBUG) # TODO: Remove debug
                                         path_mtu = None
                                         new_raw  = new_raw[:-RNS.Link.LINK_MTU_SIZE]
@@ -1799,7 +1799,7 @@ class Transport:
                     for destination in Transport.destinations:
                         if destination.hash == packet.destination_hash and destination.type == packet.destination_type:
                             path_mtu       = RNS.Link.mtu_from_lr_packet(packet)
-                            if packet.receiving_interface.AUTOCONFIGURE_MTU:
+                            if packet.receiving_interface.AUTOCONFIGURE_MTU or packet.receiving_interface.FIXED_MTU:
                                 nh_mtu     = packet.receiving_interface.HW_MTU
                             else:
                                 nh_mtu     = RNS.Reticulum.MTU
@@ -2280,7 +2280,7 @@ class Transport:
     def next_hop_interface_hw_mtu(destination_hash):
         next_hop_interface = Transport.next_hop_interface(destination_hash)
         if next_hop_interface != None:
-            if next_hop_interface.AUTOCONFIGURE_MTU:
+            if next_hop_interface.AUTOCONFIGURE_MTU or next_hop_interface.FIXED_MTU:
                 return next_hop_interface.HW_MTU
             else:
                 return None