diff --git a/container.go b/container.go
index 707872187a..1e44ddd76c 100644
--- a/container.go
+++ b/container.go
@@ -1188,10 +1188,18 @@ func (container *Container) allocateNetwork() error {
 			portJob.Setenv("Proto", port.Proto())
 			portJob.Setenv("ContainerPort", port.Port())
 
+			portEnv, err := portJob.Stdout.AddEnv()
+			if err != nil {
+				return err
+			}
 			if err := portJob.Run(); err != nil {
 				eng.Job("release_interface", container.ID).Run()
 				return err
 			}
+			b.HostIp = portEnv.Get("HostIP")
+			b.HostPort = portEnv.Get("HostPort")
+
+			binding[i] = b
 		}
 		bindings[port] = binding
 	}
diff --git a/networkdriver/lxc/driver.go b/networkdriver/lxc/driver.go
index 84e7b3ef95..ab7a18808b 100644
--- a/networkdriver/lxc/driver.go
+++ b/networkdriver/lxc/driver.go
@@ -50,10 +50,10 @@ var (
 		"192.168.44.1/24",
 	}
 
-	bridgeIface      string
-	defaultBindingIP net.IP
-	bridgeNetwork    *net.IPNet
+	bridgeIface   string
+	bridgeNetwork *net.IPNet
 
+	defaultBindingIP  = net.ParseIP("0.0.0.0")
 	currentInterfaces = make(map[string]*networkInterface)
 )
 
@@ -72,7 +72,9 @@ func InitDriver(job *engine.Job) engine.Status {
 		bridgeIP       = job.Getenv("BridgeIP")
 	)
 
-	defaultBindingIP = net.ParseIP(job.Getenv("DefaultBindingIP"))
+	if defaultIP := job.Getenv("DefaultBindingIP"); defaultIP != "" {
+		defaultBindingIP = net.ParseIP(defaultIP)
+	}
 
 	bridgeIface = job.Getenv("BridgeIface")
 	if bridgeIface == "" {
@@ -382,6 +384,8 @@ func Release(job *engine.Job) engine.Status {
 // Allocate an external port and map it to the interface
 func AllocatePort(job *engine.Job) engine.Status {
 	var (
+		err error
+
 		ip            = defaultBindingIP
 		id            = job.Args[0]
 		hostIP        = job.Getenv("HostIP")
@@ -396,7 +400,7 @@ func AllocatePort(job *engine.Job) engine.Status {
 	}
 
 	// host ip, proto, and host port
-	hostPort, err := portallocator.RequestPort(ip, proto, hostPort)
+	hostPort, err = portallocator.RequestPort(ip, proto, hostPort)
 	if err != nil {
 		job.Error(err)
 		return engine.StatusErr
@@ -423,6 +427,14 @@ func AllocatePort(job *engine.Job) engine.Status {
 	}
 	network.PortMappings = append(network.PortMappings, host)
 
+	out := engine.Env{}
+	out.Set("HostIP", ip.String())
+	out.SetInt("HostPort", hostPort)
+
+	if _, err := out.WriteTo(job.Stdout); err != nil {
+		job.Error(err)
+		return engine.StatusErr
+	}
 	return engine.StatusOK
 }
 
diff --git a/networkdriver/portallocator/portallocator.go b/networkdriver/portallocator/portallocator.go
index 2566ea8500..71cac82703 100644
--- a/networkdriver/portallocator/portallocator.go
+++ b/networkdriver/portallocator/portallocator.go
@@ -51,7 +51,7 @@ func RequestPort(ip net.IP, proto string, port int) (int, error) {
 	}
 
 	// If the user requested a specific port to be allocated
-	if port != 0 {
+	if port > 0 {
 		if err := registerSetPort(ip, proto, port); err != nil {
 			return 0, err
 		}