diff --git a/src/main/java/carpet/network/ClientNetworkHandler.java b/src/main/java/carpet/network/ClientNetworkHandler.java
index 8d77dc5b..4d3cc1ad 100644
--- a/src/main/java/carpet/network/ClientNetworkHandler.java
+++ b/src/main/java/carpet/network/ClientNetworkHandler.java
@@ -1,9 +1,11 @@
 package carpet.network;
 
 import carpet.CarpetServer;
+import carpet.CarpetExtension;
 import carpet.CarpetSettings;
 import carpet.helpers.TickSpeed;
 import carpet.settings.ParsedRule;
+import carpet.settings.SettingsManager;
 import io.netty.buffer.Unpooled;
 import net.minecraft.client.network.ClientPlayerEntity;
 import net.minecraft.nbt.AbstractNumberTag;
@@ -19,36 +21,62 @@ import java.util.function.BiConsumer;
 
 public class ClientNetworkHandler
 {
-    private static Map<String, BiConsumer<ClientPlayerEntity, Tag>> dataHandlers = new HashMap<String, BiConsumer<ClientPlayerEntity, Tag>>(){{
-        put("Rules", (p, t) -> {
+    private static Map<String, BiConsumer<ClientPlayerEntity, Tag>> dataHandlers = new HashMap<String, BiConsumer<ClientPlayerEntity, Tag>>();
+    static
+    {
+        dataHandlers.put("Rules", (p, t) -> {
             CompoundTag ruleset = (CompoundTag)t;
-            for (String ruleName: ruleset.getKeys())
+            for (String ruleKey: ruleset.getKeys())
             {
-                ParsedRule<?> rule = CarpetServer.settingsManager.getRule(ruleName);
-                if (rule == null)
-                    CarpetSettings.LOG.error("Received unknown rule: "+ruleName);
-                else
+                CompoundTag ruleNBT = (CompoundTag) ruleset.get(ruleKey);
+                SettingsManager manager = null;
+                String ruleName;
+                if (ruleNBT.contains("Manager"))
+                {
+                    ruleName = ruleNBT.getString("Rule");
+                    String managerName = ruleNBT.getString("Manager");
+                    if (managerName.equals("carpet"))
+                    {
+                        manager = CarpetServer.settingsManager;
+                    }
+                    else
+                    {
+                        for (CarpetExtension extension: CarpetServer.extensions) {
+                            SettingsManager eManager = extension.customSettingsManager();
+                            if (eManager != null && managerName.equals(eManager.getIdentifier()))
+                            {
+                                manager = eManager;
+                                break;
+                            }
+                        }
+                    }
+                }
+                else // Backwards compatibility
+                {
+                    manager = CarpetServer.settingsManager;
+                    ruleName = ruleKey;
+                }
+                ParsedRule<?> rule = (manager != null) ? manager.getRule(ruleName) : null;
+                if (rule != null)
                 {
-                    CompoundTag ruleNBT = (CompoundTag) ruleset.get(ruleName);
                     String value = ruleNBT.getString("Value");
                     rule.set(null, value);
                 }
             }
         });
-        put("TickRate", (p, t) -> TickSpeed.tickrate(((AbstractNumberTag)t).getFloat(), false));
-        put("scShape", (p, t) -> { // deprecated
+        dataHandlers.put("TickRate", (p, t) -> TickSpeed.tickrate(((AbstractNumberTag)t).getFloat(), false));
+        dataHandlers.put("scShape", (p, t) -> { // deprecated
             if (CarpetClient.shapes != null)
                 CarpetClient.shapes.addShape((CompoundTag)t);
         });
-        put("scShapes", (p, t) -> {
+        dataHandlers.put("scShapes", (p, t) -> {
             if (CarpetClient.shapes != null)
                 CarpetClient.shapes.addShapes((ListTag) t);
         });
-        put("clientCommand", (p, t) -> {
+        dataHandlers.put("clientCommand", (p, t) -> {
             CarpetClient.onClientCommand(t);
         });
-    }};
-
+    };
 
     public static void handleData(PacketByteBuf data, ClientPlayerEntity player)
     {
diff --git a/src/main/java/carpet/network/ServerNetworkHandler.java b/src/main/java/carpet/network/ServerNetworkHandler.java
index 8af2e19d..5971e93d 100644
--- a/src/main/java/carpet/network/ServerNetworkHandler.java
+++ b/src/main/java/carpet/network/ServerNetworkHandler.java
@@ -4,6 +4,7 @@ import carpet.CarpetServer;
 import carpet.CarpetSettings;
 import carpet.helpers.TickSpeed;
 import carpet.settings.ParsedRule;
+import carpet.settings.SettingsManager;
 import io.netty.buffer.Unpooled;
 import net.minecraft.nbt.CompoundTag;
 import net.minecraft.nbt.ListTag;
@@ -78,6 +79,12 @@ public class ServerNetworkHandler
             CarpetSettings.LOG.warn("Player "+playerEntity.getName().getString()+" joined with another carpet version: "+clientVersion);
         DataBuilder data = DataBuilder.create().withTickRate();
         CarpetServer.settingsManager.getRules().forEach(data::withRule);
+        CarpetServer.extensions.forEach(e -> {
+            SettingsManager eManager = e.customSettingsManager();
+            if (eManager != null) {
+                eManager.getRules().forEach(data::withRule);
+            }
+        });
         playerEntity.networkHandler.sendPacket(new CustomPayloadS2CPacket(CarpetClient.CARPET_CHANNEL, data.build() ));
     }
 
@@ -234,9 +241,14 @@ public class ServerNetworkHandler
                 rules = new CompoundTag();
                 tag.put("Rules", rules);
             }
+            String identifier = rule.settingsManager.getIdentifier();
+            String key = rule.name;
+            while (rules.contains(key)) { key = key+"2";}
             CompoundTag ruleNBT = new CompoundTag();
             ruleNBT.putString("Value", rule.getAsString());
-            rules.put(rule.name, ruleNBT);
+            ruleNBT.putString("Manager",identifier);
+            ruleNBT.putString("Rule",rule.name);
+            rules.put(key, ruleNBT);
             return this;
         }