Index: /trunk/include/VBox/intnet.h
===================================================================
--- /trunk/include/VBox/intnet.h	(revision 29490)
+++ /trunk/include/VBox/intnet.h	(revision 29491)
@@ -648,4 +648,31 @@
 
     /**
+     * Notifies when the MAC address of an interface is set or changes.
+     *
+     * @param   pIfPort     Pointer to this structure.
+     * @param   hIf         The handle of the network interface.
+     * @param   pMac        Pointer to the MAC address of the connecting VM NIC.
+     */
+    DECLR0CALLBACKMEMBER(void, pfnNotifyMacAddress,(PINTNETTRUNKIFPORT pIfPort, INTNETIFHANDLE hIf, PCRTMAC pMac));
+
+    /**
+     * Called when an interface is connected to the network.
+     *
+     * @returns IPRT status code.
+     * @param   pIfPort     Pointer to this structure.
+     * @param   hIf         The handle of the network interface.
+     */
+    DECLR0CALLBACKMEMBER(int, pfnConnectInterface,(PINTNETTRUNKIFPORT pIfPort, INTNETIFHANDLE hIf));
+
+    /**
+     * Called when an interface is disconnected from the network.
+     *
+     * @returns IPRT status code.
+     * @param   pIfPort     Pointer to this structure.
+     * @param   hIf         The handle of the network interface.
+     */
+    DECLR0CALLBACKMEMBER(int, pfnDisconnectInterface,(PINTNETTRUNKIFPORT pIfPort, INTNETIFHANDLE hIf));
+
+    /**
      * Waits for the interface to become idle.
      *
Index: /trunk/src/VBox/Devices/Network/SrvIntNetR0.cpp
===================================================================
--- /trunk/src/VBox/Devices/Network/SrvIntNetR0.cpp	(revision 29490)
+++ /trunk/src/VBox/Devices/Network/SrvIntNetR0.cpp	(revision 29491)
@@ -3622,5 +3622,11 @@
         }
 
+        PINTNETTRUNKIF pTrunk = pNetwork->MacTab.pTrunk;
         RTSpinlockReleaseNoInts(pNetwork->hAddrSpinlock, &Tmp);
+        if (pTrunk && pTrunk->pIfPort)
+        {
+            Log(("IntNetR0IfSetMacAddress: pfnNotifyMacAddress hIf=%RX32\n", hIf));
+            pTrunk->pIfPort->pfnNotifyMacAddress(pTrunk->pIfPort, hIf, pMac);
+        }
     }
     else
@@ -3964,4 +3970,12 @@
     ASMAtomicWriteBool(&pIf->fDestroying, true);
 
+    PINTNETNETWORK pNetwork = pIf->pNetwork;
+    PINTNETTRUNKIF pTrunk = pNetwork->MacTab.pTrunk;
+    if (pTrunk && pTrunk->pIfPort)
+    {
+        Log(("intnetR0IfDestruct: pfnDisconnectInterface hIf=%RX32\n", pIf->hIf));
+        pTrunk->pIfPort->pfnDisconnectInterface(pTrunk->pIfPort, pIf->hIf);
+    }
+
     /*
      * Delete the interface handle so the object no longer can be used.
@@ -3979,5 +3993,4 @@
      * of cleanup order we might have been orphaned by the network destructor.
      */
-    PINTNETNETWORK pNetwork = pIf->pNetwork;
     if (pNetwork)
     {
@@ -4079,5 +4092,5 @@
         intnetR0IfAddrCacheDestroy(&pIf->aAddrCache[i]);
 
-     pIf->pvObj = NULL;
+    pIf->pvObj = NULL;
     RTMemFree(pIf);
 }
@@ -4200,4 +4213,12 @@
                     pNetwork->MacTab.cEntries = iIf + 1;
                     pIf->pNetwork = pNetwork;
+
+                    /** @todo handle failure of pfnConnectInterface */
+                    PINTNETTRUNKIF pTrunk = pNetwork->MacTab.pTrunk;
+                    if (pTrunk && pTrunk->pIfPort)
+                    {
+                        Log(("intnetR0NetworkCreateIf: pfnConnectInterface hIf=%RX32\n", pIf->hIf));
+                        pTrunk->pIfPort->pfnConnectInterface(pTrunk->pIfPort, pIf->hIf);
+                    }
 
                     RTSpinlockReleaseNoInts(pNetwork->hAddrSpinlock, &Tmp);
Index: /trunk/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFlt.c
===================================================================
--- /trunk/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFlt.c	(revision 29490)
+++ /trunk/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFlt.c	(revision 29491)
@@ -535,4 +535,70 @@
 
 /**
+ * @copydoc INTNETTRUNKIFPORT::pfnNotifyMacAddress
+ */
+static DECLCALLBACK(void) vboxNetFltPortNotifyMacAddress(PINTNETTRUNKIFPORT pIfPort, INTNETIFHANDLE hIf, PCRTMAC pMac)
+{
+    PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
+
+    /*
+     * Input validation.
+     */
+    AssertPtr(pThis);
+    AssertPtr(pSG);
+    Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
+
+    vboxNetFltRetain(pThis, false /* fBusy */);
+    vboxNetFltPortOsNotifyMacAddress(pThis, hIf, pMac);
+    vboxNetFltRelease(pThis, false /* fBusy */);
+}
+
+
+/**
+ * @copydoc INTNETTRUNKIFPORT::pfnConnectInterface
+ */
+static DECLCALLBACK(int) vboxNetFltPortConnectInterface(PINTNETTRUNKIFPORT pIfPort,  INTNETIFHANDLE hIf)
+{
+    PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
+    int rc = VINF_SUCCESS;
+
+    /*
+     * Input validation.
+     */
+    AssertPtr(pThis);
+    AssertPtr(pSG);
+    Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
+
+    vboxNetFltRetain(pThis, false /* fBusy */);
+    rc = vboxNetFltPortOsConnectInterface(pThis, hIf);
+    vboxNetFltRelease(pThis, false /* fBusy */);
+
+    return rc;
+}
+
+
+/**
+ * @copydoc INTNETTRUNKIFPORT::pfnDisconnectInterface
+ */
+static DECLCALLBACK(int) vboxNetFltPortDisconnectInterface(PINTNETTRUNKIFPORT pIfPort, INTNETIFHANDLE hIf)
+{
+    PVBOXNETFLTINS pThis = IFPORT_2_VBOXNETFLTINS(pIfPort);
+    int rc = VINF_SUCCESS;
+
+    /*
+     * Input validation.
+     */
+    AssertPtr(pThis);
+    AssertPtr(pSG);
+    Assert(pThis->MyPort.u32Version == INTNETTRUNKIFPORT_VERSION);
+
+    vboxNetFltRetain(pThis, false /* fBusy */);
+    rc = vboxNetFltPortOsDisconnectInterface(pThis, hIf);
+    vboxNetFltRelease(pThis, false /* fBusy */);
+
+    return rc;
+}
+
+
+/**
  * @copydoc INTNETTRUNKIFPORT::pfnDisconnectAndRelease
  */
@@ -933,4 +999,7 @@
     pNew->MyPort.pfnWaitForIdle         = vboxNetFltPortWaitForIdle;
     pNew->MyPort.pfnXmit                = vboxNetFltPortXmit;
+    pNew->MyPort.pfnNotifyMacAddress    = vboxNetFltPortNotifyMacAddress;
+    pNew->MyPort.pfnConnectInterface    = vboxNetFltPortConnectInterface;
+    pNew->MyPort.pfnDisconnectInterface = vboxNetFltPortDisconnectInterface;    
     pNew->MyPort.u32VersionEnd          = INTNETTRUNKIFPORT_VERSION;
     pNew->pSwitchPort                   = pSwitchPort;
Index: /trunk/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFltInternal.h
===================================================================
--- /trunk/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFltInternal.h	(revision 29490)
+++ /trunk/src/VBox/HostDrivers/VBoxNetFlt/VBoxNetFltInternal.h	(revision 29491)
@@ -380,4 +380,30 @@
 
 /**
+ * This is called when a network interface has obtained a new MAC address.
+ *
+ * @param   pThis           The instance.
+ * @param   hIf             The handle to the network.
+ * @param   pMac            Pointer to the new MAC address.
+ */
+DECLHIDDEN(void) vboxNetFltPortOsNotifyMacAddress(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf, PCRTMAC pMac);
+
+/**
+ * This is called when an interface is connected to the network.
+ *
+ * @return IPRT status code.
+ * @param   pThis           The instance.
+ * @param   hIf             The handle to the network.
+ */
+DECLHIDDEN(int) vboxNetFltPortOsConnectInterface(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf);
+
+/**
+ * This is called when a VM host disconnects from the network.
+ *
+ * @param   pThis           The instance.
+ * @param   hIf             The handle to the network.
+ */
+DECLHIDDEN(int) vboxNetFltPortOsDisconnectInterface(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf);
+
+/**
  * This is called to when disconnecting from a network.
  *
Index: /trunk/src/VBox/HostDrivers/VBoxNetFlt/darwin/VBoxNetFlt-darwin.cpp
===================================================================
--- /trunk/src/VBox/HostDrivers/VBoxNetFlt/darwin/VBoxNetFlt-darwin.cpp	(revision 29490)
+++ /trunk/src/VBox/HostDrivers/VBoxNetFlt/darwin/VBoxNetFlt-darwin.cpp	(revision 29491)
@@ -1191,2 +1191,24 @@
 }
 
+
+void vboxNetFltPortOsNotifyMacAddress(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf, PCRTMAC pMac)
+{
+    NOREF(pThis); NOREF(hIf); NOREF(pMac);
+}
+
+
+int vboxNetFltPortOsConnectInterface(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf)
+{
+    /* Nothing to do */
+    NOREF(pThis); NOREF(hIf);
+    return VINF_SUCCESS;
+}
+
+
+int vboxNetFltPortOsDisconnectInterface(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf)
+{
+    /* Nothing to do */
+    NOREF(pThis); NOREF(hIf);
+    return VINF_SUCCESS;
+}
+
Index: /trunk/src/VBox/HostDrivers/VBoxNetFlt/freebsd/VBoxNetFlt-freebsd.c
===================================================================
--- /trunk/src/VBox/HostDrivers/VBoxNetFlt/freebsd/VBoxNetFlt-freebsd.c	(revision 29490)
+++ /trunk/src/VBox/HostDrivers/VBoxNetFlt/freebsd/VBoxNetFlt-freebsd.c	(revision 29491)
@@ -745,2 +745,22 @@
     return VINF_SUCCESS;
 }
+
+void vboxNetFltPortOsNotifyMacAddress(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf, PCRTMAC pMac)
+{
+    NOREF(pThis); NOREF(hIf); NOREF(pMac);
+}
+
+int vboxNetFltPortOsConnectInterface(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf)
+{
+    /* Nothing to do */
+    NOREF(pThis); NOREF(hIf);
+    return VINF_SUCCESS;
+}
+
+int vboxNetFltPortOsDisconnectInterface(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf)
+{
+    /* Nothing to do */
+    NOREF(pThis); NOREF(hIf);
+    return VINF_SUCCESS;
+}
+
Index: /trunk/src/VBox/HostDrivers/VBoxNetFlt/linux/VBoxNetFlt-linux.c
===================================================================
--- /trunk/src/VBox/HostDrivers/VBoxNetFlt/linux/VBoxNetFlt-linux.c	(revision 29490)
+++ /trunk/src/VBox/HostDrivers/VBoxNetFlt/linux/VBoxNetFlt-linux.c	(revision 29491)
@@ -1765,2 +1765,24 @@
 }
 
+
+void vboxNetFltPortOsNotifyMacAddress(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf, PCRTMAC pMac)
+{
+    NOREF(pThis); NOREF(hIf); NOREF(pMac);
+}
+
+
+int vboxNetFltPortOsConnectInterface(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf)
+{
+    /* Nothing to do */
+    NOREF(pThis); NOREF(hIf);
+    return VINF_SUCCESS;
+}
+
+
+int vboxNetFltPortOsDisconnectInterface(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf)
+{
+    /* Nothing to do */
+    NOREF(pThis); NOREF(hIf);
+    return VINF_SUCCESS;
+}
+
Index: /trunk/src/VBox/HostDrivers/VBoxNetFlt/solaris/VBoxNetFlt-solaris.c
===================================================================
--- /trunk/src/VBox/HostDrivers/VBoxNetFlt/solaris/VBoxNetFlt-solaris.c	(revision 29490)
+++ /trunk/src/VBox/HostDrivers/VBoxNetFlt/solaris/VBoxNetFlt-solaris.c	(revision 29491)
@@ -3705,4 +3705,26 @@
 
 
+void vboxNetFltPortOsNotifyMacAddress(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf, PCRTMAC pMac)
+{
+    NOREF(pThis); NOREF(hIf); NOREF(pMac);
+}
+
+
+int vboxNetFltPortOsConnectInterface(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf)
+{
+    /* Nothing to do */
+    NOREF(pThis); NOREF(hIf);
+    return VINF_SUCCESS;
+}
+
+
+int vboxNetFltPortOsDisconnectInterface(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf)
+{
+    /* Nothing to do */
+    NOREF(pThis); NOREF(hIf);
+    return VINF_SUCCESS;
+}
+
+
 int vboxNetFltPortOsXmit(PVBOXNETFLTINS pThis, PINTNETSG pSG, uint32_t fDst)
 {
Index: /trunk/src/VBox/HostDrivers/VBoxNetFlt/solaris/VBoxNetFltBow-solaris.c
===================================================================
--- /trunk/src/VBox/HostDrivers/VBoxNetFlt/solaris/VBoxNetFltBow-solaris.c	(revision 29490)
+++ /trunk/src/VBox/HostDrivers/VBoxNetFlt/solaris/VBoxNetFltBow-solaris.c	(revision 29491)
@@ -1094,2 +1094,22 @@
 }
 
+
+void vboxNetFltPortOsNotifyMacAddress(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf, PCRTMAC pMac)
+{
+    LogRel((DEVICE_NAME ":vboxNetFltPortOSNotifyMacAddress %s %.6Rhxs\n", pThis->szName, pMac));
+}
+
+
+int vboxNetFltPortOsConnectInterface(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf)
+{
+    LogRel((DEVICE_NAME ":vboxNetFltPortOsConnectInterface\n"));
+    return VINF_SUCCESS;
+}
+
+
+int vboxNetFltPortOsDisconnectInterface(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf)
+{
+    LogRel((DEVICE_NAME ":vboxNetFltPortOsDisconnectInterface\n"));
+    return VINF_SUCCESS;
+}
+
Index: /trunk/src/VBox/HostDrivers/VBoxNetFlt/win/VBoxNetFlt-win.c
===================================================================
--- /trunk/src/VBox/HostDrivers/VBoxNetFlt/win/VBoxNetFlt-win.c	(revision 29490)
+++ /trunk/src/VBox/HostDrivers/VBoxNetFlt/win/VBoxNetFlt-win.c	(revision 29491)
@@ -3777,2 +3777,21 @@
 }
 
+void vboxNetFltPortOsNotifyMacAddress(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf, PCRTMAC pMac)
+{
+    NOREF(pThis); NOREF(hIf); NOREF(pMac);
+}
+
+int vboxNetFltPortOsConnectInterface(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf)
+{
+    /* Nothing to do */
+    NOREF(pThis); NOREF(hIf);
+    return VINF_SUCCESS;
+}
+
+int vboxNetFltPortOsDisconnectInterface(PVBOXNETFLTINS pThis, INTNETIFHANDLE hIf)
+{
+    /* Nothing to do */
+    NOREF(pThis); NOREF(hIf);
+    return VINF_SUCCESS;
+}
+