diff --git a/RNS/Interfaces/AutoInterface.py b/RNS/Interfaces/AutoInterface.py
index 57634851..c136efdf 100644
--- a/RNS/Interfaces/AutoInterface.py
+++ b/RNS/Interfaces/AutoInterface.py
@@ -580,6 +580,7 @@ class AutoInterface(Interface):
                 spawned_interface.announce_rate_grace = self.announce_rate_grace
                 spawned_interface.announce_rate_penalty = self.announce_rate_penalty
                 spawned_interface.mode = self.mode
+                spawned_interface.gravity = self.gravity
                 spawned_interface.HW_MTU = self.HW_MTU
                 spawned_interface.online = True
                 RNS.Transport.add_interface(spawned_interface)
diff --git a/RNS/Interfaces/BackboneInterface.py b/RNS/Interfaces/BackboneInterface.py
index 89e2208d..048904f3 100644
--- a/RNS/Interfaces/BackboneInterface.py
+++ b/RNS/Interfaces/BackboneInterface.py
@@ -482,6 +482,7 @@ class BackboneInterface(Interface):
             spawned_interface.announce_rate_grace = self.announce_rate_grace
             spawned_interface.announce_rate_penalty = self.announce_rate_penalty
             spawned_interface.mode = self.mode
+            spawned_interface.gravity = self.gravity
             spawned_interface.HW_MTU = self.HW_MTU
             RNS.log("Spawned new BackboneClient Interface: "+str(spawned_interface), RNS.LOG_PATHING) if RNS.sl(RNS.LOG_PATHING) else None
             RNS.Transport.add_interface(spawned_interface)
diff --git a/RNS/Interfaces/I2PInterface.py b/RNS/Interfaces/I2PInterface.py
index 532fafcb..18a5bf2d 100644
--- a/RNS/Interfaces/I2PInterface.py
+++ b/RNS/Interfaces/I2PInterface.py
@@ -990,6 +990,7 @@ class I2PInterface(Interface):
         spawned_interface.announce_rate_grace = self.announce_rate_grace
         spawned_interface.announce_rate_penalty = self.announce_rate_penalty
         spawned_interface.mode = self.mode
+        spawned_interface.gravity = self.gravity
         spawned_interface.HW_MTU = self.HW_MTU
         RNS.log("Spawned new I2PInterface Peer: "+str(spawned_interface), RNS.LOG_VERBOSE)
         RNS.Transport.add_interface(spawned_interface)
diff --git a/RNS/Interfaces/Interface.py b/RNS/Interfaces/Interface.py
index e0f84937..996ed8bc 100755
--- a/RNS/Interfaces/Interface.py
+++ b/RNS/Interfaces/Interface.py
@@ -71,9 +71,8 @@ class Interface:
     # to hold at any given time.
     MAX_HELD_ANNOUNCES  = 256
 
-    # How long a spawned interface will be
-    # considered to be newly created. Two
-    # hours by default.
+    # Control parameters
+    DEFAULT_GRAVITY          = 0
     IC_NEW_TIME              = 2*60*60
     IC_BURST_FREQ_NEW        = 3
     IC_BURST_FREQ            = 10
diff --git a/RNS/Interfaces/TCPInterface.py b/RNS/Interfaces/TCPInterface.py
index 5559732f..90c9ea3b 100644
--- a/RNS/Interfaces/TCPInterface.py
+++ b/RNS/Interfaces/TCPInterface.py
@@ -636,6 +636,7 @@ class TCPServerInterface(Interface):
         spawned_interface.announce_rate_grace = self.announce_rate_grace
         spawned_interface.announce_rate_penalty = self.announce_rate_penalty
         spawned_interface.mode = self.mode
+        spawned_interface.gravity = self.gravity
         spawned_interface.HW_MTU = self.HW_MTU
         spawned_interface.online = True
         RNS.log("Spawned new TCPClient Interface: "+str(spawned_interface), RNS.LOG_VERBOSE)
diff --git a/RNS/Interfaces/WeaveInterface.py b/RNS/Interfaces/WeaveInterface.py
index 7f96fb45..33d00afb 100644
--- a/RNS/Interfaces/WeaveInterface.py
+++ b/RNS/Interfaces/WeaveInterface.py
@@ -961,6 +961,7 @@ class WeaveInterface(Interface):
             spawned_interface.announce_rate_grace = self.announce_rate_grace
             spawned_interface.announce_rate_penalty = self.announce_rate_penalty
             spawned_interface.mode = self.mode
+            spawned_interface.gravity = self.gravity
             spawned_interface.HW_MTU = self.HW_MTU
             spawned_interface._online = True
             RNS.Transport.add_interface(spawned_interface)