diff --git a/RNS/Interfaces/BackboneInterface.py b/RNS/Interfaces/BackboneInterface.py
index 158aa1c..6d1ad7a 100644
--- a/RNS/Interfaces/BackboneInterface.py
+++ b/RNS/Interfaces/BackboneInterface.py
@@ -173,16 +173,20 @@ class BackboneInterface(Interface):
 
     @staticmethod
     def register_in(fileno):
-        # TODO: Remove debug
-        # RNS.log(f"Registering EPOLL_IN for {fileno}", RNS.LOG_DEBUG)
+        if fileno < 0:
+            RNS.log(f"Attempt to register invalid file descriptor {fileno}", RNS.LOG_ERROR)
+            return
+
         try: BackboneInterface.epoll.register(fileno, select.EPOLLIN)
         except Exception as e:
             RNS.log(f"An error occurred while registering EPOLL_IN for file descriptor {fileno}: {e}", RNS.LOG_ERROR)
 
     @staticmethod
     def deregister_fileno(fileno):
-        # TODO: Remove debug
-        # RNS.log(f"Deregistering {fileno}", RNS.LOG_DEBUG)
+        if fileno < 0:
+            RNS.log(f"Attempt to deregister invalid file descriptor {fileno}", RNS.LOG_ERROR)
+            return
+
         try: BackboneInterface.epoll.unregister(fileno)
         except Exception as e:
             RNS.log(f"An error occurred while deregistering file descriptor {fileno}: {e}", RNS.LOG_DEBUG)
@@ -223,7 +227,7 @@ class BackboneInterface(Interface):
                                 spawned_interface = BackboneInterface.spawned_interface_filenos[fileno]
                                 client_socket = spawned_interface.socket
                                 if client_socket and fileno == client_socket.fileno() and (event & select.EPOLLIN):
-                                    try: received_bytes = client_socket.recv(4096)
+                                    try: received_bytes = client_socket.recv(spawned_interface.HW_MTU)
                                     except Exception as e:
                                         RNS.log(f"Error while reading from {spawned_interface}: {e}", RNS.LOG_DEBUG)
                                         received_bytes = b""
@@ -647,9 +651,6 @@ class BackboneClientInterface(Interface):
 
 
     def __str__(self):
-        if ":" in self.target_ip:
-            ip_str = f"[{self.target_ip}]"
-        else:
-            ip_str = f"{self.target_ip}"
-
+        if ":" in self.target_ip: ip_str = f"[{self.target_ip}]"
+        else: ip_str = f"{self.target_ip}"
         return "BackboneInterface["+str(self.name)+"/"+ip_str+":"+str(self.target_port)+"]"
\ No newline at end of file
diff --git a/RNS/Interfaces/Interface.py b/RNS/Interfaces/Interface.py
index 9918ea2..41583c5 100755
--- a/RNS/Interfaces/Interface.py
+++ b/RNS/Interfaces/Interface.py
@@ -128,7 +128,7 @@ class Interface:
     def optimise_mtu(self):
         if self.AUTOCONFIGURE_MTU:
             if self.bitrate   > 500_000_000:
-                self.HW_MTU = 1048576
+                self.HW_MTU = 524288
             elif self.bitrate > 16_000_000:
                 self.HW_MTU = 262144
             elif self.bitrate > 8_000_000:
diff --git a/RNS/Transport.py b/RNS/Transport.py
index b35bf92..0dd6c1d 100755
--- a/RNS/Transport.py
+++ b/RNS/Transport.py
@@ -1744,7 +1744,7 @@ class Transport:
                             if hasattr(packet.receiving_interface, "tunnel_id") and packet.receiving_interface.tunnel_id != None:
                                 tunnel_entry = Transport.tunnels[packet.receiving_interface.tunnel_id]
                                 paths = tunnel_entry[IDX_TT_PATHS]
-                                paths[packet.destination_hash] = path_table_entry
+                                paths[packet.destination_hash] = [now, received_from, announce_hops, expires, random_blobs, None, packet.packet_hash]
                                 expires = time.time() + Transport.DESTINATION_TIMEOUT
                                 tunnel_entry[IDX_TT_EXPIRES] = expires
                                 RNS.log("Path to "+RNS.prettyhexrep(packet.destination_hash)+" associated with tunnel "+RNS.prettyhexrep(packet.receiving_interface.tunnel_id), RNS.LOG_DEBUG)
@@ -2045,7 +2045,7 @@ class Transport:
                 received_from = path_entry[1]
                 announce_hops = path_entry[2]
                 expires = path_entry[3]
-                random_blobs = path_entry[4]
+                random_blobs = list(set(path_entry[4]))
                 receiving_interface = interface
                 packet_hash = path_entry[6]
                 new_entry = [time.time(), received_from, announce_hops, expires, random_blobs, receiving_interface, packet_hash]