@@ -582,6 +582,7 @@ func (container *Container) Start() (err error) {

 		params = append(params,

 			"-g", network.Gateway,

 			"-i", fmt.Sprintf("%s/%d", network.IPAddress, network.IPPrefixLen),

+			"-mtu", "1500",

 		)

 	}

@@ -14,7 +14,6 @@ lxc.network.type = empty

 lxc.network.type = veth

 lxc.network.link = {{.NetworkSettings.Bridge}}

 lxc.network.name = eth0

-lxc.network.mtu = 1500

 {{end}}

 # root filesystem

@@ -25,3 +25,7 @@ func AddDefaultGw(ip net.IP) error {

 	return fmt.Errorf("Not implemented")

 }

+

+func NetworkSetMTU(iface *net.Interface, mtu int) error {

+	return fmt.Errorf("Not implemented")

+}

@@ -328,7 +328,6 @@ func AddDefaultGw(ip net.IP) error {

 	}

 	return s.HandleAck(wb.Seq)

-

 }

 // Bring up a particular network interface

@@ -354,6 +353,37 @@ func NetworkLinkUp(iface *net.Interface) error {

 	return s.HandleAck(wb.Seq)

 }

+func NetworkSetMTU(iface *net.Interface, mtu int) error {

+	s, err := getNetlinkSocket()

+	if err != nil {

+		return err

+	}

+	defer s.Close()

+

+	wb := newNetlinkRequest(syscall.RTM_SETLINK, syscall.NLM_F_ACK)

+

+	msg := newIfInfomsg(syscall.AF_UNSPEC)

+	msg.Type = syscall.RTM_SETLINK

+	msg.Flags = syscall.NLM_F_REQUEST

+	msg.Index = int32(iface.Index)

+	msg.Change = 0xFFFFFFFF

+	wb.AddData(msg)

+

+	var (

+		b      = make([]byte, 4)

+		native = nativeEndian()

+	)

+	native.PutUint32(b, uint32(mtu))

+

+	data := newRtAttr(syscall.IFLA_MTU, b)

+	wb.AddData(data)

+

+	if err := s.Send(wb); err != nil {

+		return err

+	}

+	return s.HandleAck(wb.Seq)

+}

+

 // Add an Ip address to an interface. This is identical to:

 // ip addr add $ip/$ipNet dev $iface

 func NetworkLinkAddIp(iface *net.Interface, ip net.IP, ipNet *net.IPNet) error {

@@ -25,6 +25,7 @@ type DockerInitArgs struct {

 	privileged bool

 	env        []string

 	args       []string

+	mtu        int

 }

 func setupHostname(args *DockerInitArgs) error {

@@ -50,6 +51,9 @@ func setupNetworking(args *DockerInitArgs) error {

 		if err := netlink.NetworkLinkAddIp(iface, ip, ipNet); err != nil {

 			return fmt.Errorf("Unable to set up networking: %v", err)

 		}

+		if err := netlink.NetworkSetMTU(iface, args.mtu); err != nil {

+			return fmt.Errorf("Unable to set MTU: %v", err)

+		}

 		if err := netlink.NetworkLinkUp(iface); err != nil {

 			return fmt.Errorf("Unable to set up networking: %v", err)

 		}

@@ -227,6 +231,7 @@ func SysInit() {

 	ip := flag.String("i", "", "ip address")

 	workDir := flag.String("w", "", "workdir")

 	privileged := flag.Bool("privileged", false, "privileged mode")

+	mtu := flag.Int("mtu", 1500, "interface mtu")

 	flag.Parse()

 	// Get env

@@ -250,6 +255,7 @@ func SysInit() {

 		privileged: *privileged,

 		env:        env,

 		args:       flag.Args(),

+		mtu:        *mtu,

 	}

 	if err := executeProgram(args); err != nil {