diff --git a/apps/mobility/pom.xml b/apps/mobility/pom.xml
new file mode 100644
index 0000000..a919ff2
--- /dev/null
+++ b/apps/mobility/pom.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.onlab.onos</groupId>
+        <artifactId>onos-apps</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+    <artifactId>onos-app-mobility</artifactId>
+    <packaging>bundle</packaging>
+
+    <description>ONOS simple Mobility app</description>
+
+</project>
diff --git a/apps/mobility/src/main/java/org/onlab/onos/mobility/HostMobility.java b/apps/mobility/src/main/java/org/onlab/onos/mobility/HostMobility.java
new file mode 100644
index 0000000..cb60405
--- /dev/null
+++ b/apps/mobility/src/main/java/org/onlab/onos/mobility/HostMobility.java
@@ -0,0 +1,118 @@
+package org.onlab.onos.mobility;
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.util.Collection;
+import java.util.List;
+
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.onlab.onos.ApplicationId;
+import org.onlab.onos.net.Device;
+import org.onlab.onos.net.Host;
+import org.onlab.onos.net.device.DeviceService;
+import org.onlab.onos.net.flow.FlowRule;
+import org.onlab.onos.net.flow.FlowRuleService;
+import org.onlab.onos.net.flow.criteria.Criteria.EthCriterion;
+import org.onlab.onos.net.flow.criteria.Criterion;
+import org.onlab.onos.net.flow.criteria.Criterion.Type;
+import org.onlab.onos.net.host.HostEvent;
+import org.onlab.onos.net.host.HostListener;
+import org.onlab.onos.net.host.HostService;
+import org.onlab.packet.MacAddress;
+import org.slf4j.Logger;
+
+import com.google.common.collect.Lists;
+
+
+/**
+ * Sample reactive forwarding application.
+ */
+@Component(immediate = true)
+public class HostMobility {
+
+    private final Logger log = getLogger(getClass());
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected HostService hostService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected FlowRuleService flowRuleService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected DeviceService deviceService;
+
+    private ApplicationId appId;
+
+    @Activate
+    public void activate() {
+        appId = ApplicationId.getAppId();
+        hostService.addListener(new InternalHostListener());
+        log.info("Started with Application ID {}", appId.id());
+    }
+
+    @Deactivate
+    public void deactivate() {
+        flowRuleService.removeFlowRulesById(appId);
+        log.info("Stopped");
+    }
+
+    public class InternalHostListener
+    implements HostListener {
+
+        @Override
+        public void event(HostEvent event) {
+            switch (event.type()) {
+                case HOST_ADDED:
+                case HOST_REMOVED:
+                case HOST_UPDATED:
+                    // don't care if a host has been added, removed.
+                    break;
+                case HOST_MOVED:
+                    log.info("Host {} has moved; cleaning up.", event.subject());
+                    cleanup(event.subject());
+                    break;
+
+                default:
+                    break;
+
+            }
+
+        }
+
+        private void cleanup(Host host) {
+            Iterable<Device> devices = deviceService.getDevices();
+            List<FlowRule> flowRules = Lists.newLinkedList();
+            for (Device device : devices) {
+                   flowRules.addAll(cleanupDevice(device, host));
+            }
+            FlowRule[] flows = new FlowRule[flowRules.size()];
+            flows = flowRules.toArray(flows);
+            flowRuleService.removeFlowRules(flows);
+        }
+
+        private Collection<? extends FlowRule> cleanupDevice(Device device, Host host) {
+            List<FlowRule> flowRules = Lists.newLinkedList();
+            MacAddress mac = host.mac();
+            for (FlowRule rule : flowRuleService.getFlowEntries(device.id())) {
+                for (Criterion c : rule.selector().criteria()) {
+                    if (c.type() == Type.ETH_DST || c.type() == Type.ETH_SRC) {
+                        EthCriterion eth = (EthCriterion) c;
+                        if (eth.mac().equals(mac)) {
+                            flowRules.add(rule);
+                            break;
+                        }
+                    }
+                }
+            }
+            //TODO: handle ip cleanup
+            return flowRules;
+        }
+
+    }
+
+}
+
+
diff --git a/apps/mobility/src/main/java/org/onlab/onos/mobility/package-info.java b/apps/mobility/src/main/java/org/onlab/onos/mobility/package-info.java
new file mode 100644
index 0000000..ea5bdf0
--- /dev/null
+++ b/apps/mobility/src/main/java/org/onlab/onos/mobility/package-info.java
@@ -0,0 +1,4 @@
+/**
+ * Trivial application that provides simple form of reactive forwarding.
+ */
+package org.onlab.onos.mobility;
diff --git a/apps/pom.xml b/apps/pom.xml
index de9faa7..f16783f 100644
--- a/apps/pom.xml
+++ b/apps/pom.xml
@@ -20,6 +20,7 @@
         <module>tvue</module>
         <module>fwd</module>
         <module>foo</module>
+        <module>mobility</module>
     </modules>
 
     <properties>
diff --git a/core/net/src/main/java/org/onlab/onos/net/flow/impl/FlowRuleManager.java b/core/net/src/main/java/org/onlab/onos/net/flow/impl/FlowRuleManager.java
index 4babb50..89c3399 100644
--- a/core/net/src/main/java/org/onlab/onos/net/flow/impl/FlowRuleManager.java
+++ b/core/net/src/main/java/org/onlab/onos/net/flow/impl/FlowRuleManager.java
@@ -161,7 +161,7 @@
             switch (stored.state()) {
             case ADDED:
             case PENDING_ADD:
-                frp.applyFlowRule(flowRule);
+                frp.applyFlowRule(stored);
                 break;
             case PENDING_REMOVE:
             case REMOVED:
diff --git a/core/store/trivial/src/main/java/org/onlab/onos/net/trivial/impl/SimpleFlowRuleStore.java b/core/store/trivial/src/main/java/org/onlab/onos/net/trivial/impl/SimpleFlowRuleStore.java
index 38e94aa..6b6c157 100644
--- a/core/store/trivial/src/main/java/org/onlab/onos/net/trivial/impl/SimpleFlowRuleStore.java
+++ b/core/store/trivial/src/main/java/org/onlab/onos/net/trivial/impl/SimpleFlowRuleStore.java
@@ -105,11 +105,9 @@
          */
 
         if (flowEntries.containsEntry(did, f)) {
-            //synchronized (flowEntries) {
             flowEntries.remove(did, f);
             flowEntries.put(did, f);
             flowEntriesById.remove(rule.appId(), rule);
-            //}
         }
     }
 
diff --git a/features/features.xml b/features/features.xml
index c32bc3d..63511fd 100644
--- a/features/features.xml
+++ b/features/features.xml
@@ -116,6 +116,14 @@
         <bundle>mvn:org.onlab.onos/onos-app-fwd/1.0.0-SNAPSHOT</bundle>
     </feature>
 
+    <feature name="onos-app-mobility" version="1.0.0"
+             description="ONOS sample forwarding application">
+        <feature>onos-api</feature>
+        <bundle>mvn:org.onlab.onos/onos-app-mobility/1.0.0-SNAPSHOT</bundle>
+    </feature>
+
+
+
     <feature name="onos-app-foo" version="1.0.0"
              description="ONOS sample playground application">
         <feature>onos-api</feature>
diff --git a/providers/openflow/flow/src/main/java/org/onlab/onos/provider/of/flow/impl/FlowModBuilder.java b/providers/openflow/flow/src/main/java/org/onlab/onos/provider/of/flow/impl/FlowModBuilder.java
index 2822f02..efe436f 100644
--- a/providers/openflow/flow/src/main/java/org/onlab/onos/provider/of/flow/impl/FlowModBuilder.java
+++ b/providers/openflow/flow/src/main/java/org/onlab/onos/provider/of/flow/impl/FlowModBuilder.java
@@ -93,7 +93,7 @@
         OFFlowMod fm = factory.buildFlowDelete()
                 .setCookie(U64.of(cookie.value()))
                 .setBufferId(OFBufferId.NO_BUFFER)
-                .setActions(actions)
+                //.setActions(actions)
                 .setMatch(match)
                 .setFlags(Collections.singleton(OFFlowModFlags.SEND_FLOW_REM))
                 .setPriority(priority)
@@ -104,6 +104,9 @@
 
     private List<OFAction> buildActions() {
         List<OFAction> acts = new LinkedList<>();
+        if (treatment == null) {
+            return acts;
+        }
         for (Instruction i : treatment.instructions()) {
             switch (i.type()) {
             case DROP:
diff --git a/providers/openflow/packet/src/main/java/org/onlab/onos/provider/of/packet/impl/OpenFlowPacketProvider.java b/providers/openflow/packet/src/main/java/org/onlab/onos/provider/of/packet/impl/OpenFlowPacketProvider.java
index cb7f1f9..41cb586 100644
--- a/providers/openflow/packet/src/main/java/org/onlab/onos/provider/of/packet/impl/OpenFlowPacketProvider.java
+++ b/providers/openflow/packet/src/main/java/org/onlab/onos/provider/of/packet/impl/OpenFlowPacketProvider.java
@@ -106,10 +106,6 @@
         for (Instruction inst : packet.treatment().instructions()) {
             if (inst.type().equals(Instruction.Type.OUTPUT)) {
                 p = portDesc(((OutputInstruction) inst).port());
-                /*if (!sw.getPorts().contains(p)) {
-                    log.warn("Tried to write out non-existent port {}", p.getPortNo());
-                    continue;
-                }*/
                 OFPacketOut po = packetOut(sw, eth, p.getPortNo());
                 sw.sendMsg(po);
             }