diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 83aa9836579..ddaa8a5a1cf 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -110,6 +110,10 @@ struct lo_driver_s
 
 static struct lo_driver_s g_loopback;
 
+#ifdef CONFIG_NET_MULTIBUFFER
+static uint8_t g_iobuffer[[MAX_NET_DEV_MTU + CONFIG_NET_GUARDSIZE];
+#endif
+
 /****************************************************************************
  * Private Function Prototypes
  ****************************************************************************/
@@ -507,18 +511,21 @@ int localhost_initialize(void)
   /* Initialize the driver structure */
 
   memset(priv, 0, sizeof(struct lo_driver_s));
-  priv->lo_dev.d_ifup    = lo_ifup;     /* I/F up (new IP address) callback */
-  priv->lo_dev.d_ifdown  = lo_ifdown;   /* I/F down callback */
-  priv->lo_dev.d_txavail = lo_txavail;  /* New TX data callback */
+  priv->lo_dev.d_ifup    = lo_ifup;      /* I/F up (new IP address) callback */
+  priv->lo_dev.d_ifdown  = lo_ifdown;    /* I/F down callback */
+  priv->lo_dev.d_txavail = lo_txavail;   /* New TX data callback */
 #ifdef CONFIG_NET_IGMP
-  priv->lo_dev.d_addmac  = lo_addmac;   /* Add multicast MAC address */
-  priv->lo_dev.d_rmmac   = lo_rmmac;    /* Remove multicast MAC address */
+  priv->lo_dev.d_addmac  = lo_addmac;    /* Add multicast MAC address */
+  priv->lo_dev.d_rmmac   = lo_rmmac;     /* Remove multicast MAC address */
 #endif
-  priv->lo_dev.d_private = (void*)priv; /* Used to recover private state from dev */
+#ifdef CONFIG_NET_MULTIBUFFER
+  priv->lo_dev.d_buf     = g_iobuffer;   /* Attach the IO buffer */
+#endif
+  priv->lo_dev.d_private = (void*)priv;  /* Used to recover private state from dev */
 
   /* Create a watchdog for timing polling for and timing of transmissions */
 
-  priv->lo_polldog       = wd_create();   /* Create periodic poll timer */
+  priv->lo_polldog       = wd_create();  /* Create periodic poll timer */
 
   /* Register the loopabck device with the OS so that socket IOCTLs can b
    * performed.
diff --git a/include/nuttx/net/netconfig.h b/include/nuttx/net/netconfig.h
index 8b182b0b821..f65b1c478d3 100644
--- a/include/nuttx/net/netconfig.h
+++ b/include/nuttx/net/netconfig.h
@@ -62,6 +62,14 @@
  * Public Type Definitions
  ****************************************************************************/
 
+#ifndef MAX
+#  define MAX(a,b) ((a) > (b) ? (a) : (b))
+#endif
+
+#ifndef MIN
+#  define MIN(a,b) ((a) < (b) ? (a) : (b))
+#endif
+
 /* Layer 2 Configuration Options ********************************************/
 
 /* The default data link layer for uIP is Ethernet.  If CONFIG_NET_SLIP is
@@ -125,20 +133,28 @@
 #    define _MAX_ETH_MTU   0
 #  endif
 
-#  ifdef CONFIG_NET_SLIP
-#    define _MIN_SLIP_MTU  MIN(_MIN_ETH_MTU,CONFIG_NET_SLIP_MTU)
-#    define _MAX_SLIP_MTU  MAX(_MAX_ETH_MTU,CONFIG_NET_SLIP_MTU)
+#  ifdef CONFIG_NET_LOOPBACK
+#    define _MIN_LO_MTU    MIN(_MIN_ETH_MTU,1518)
+#    define _MAX_LO_MTU    MAX(_MAX_ETH_MTU,574)
 #  else
-#    define _MIN_SLIP_MTU  _MIN_ETH_MTU
-#    define _MAX_SLIP_MTU  _MAX_ETH_MTU
+#    define _MIN_LO_MTU   _MIN_ETH_MTU
+#    define _MAX_LO_MTU   _MAX_ETH_MTU
+#  endif
+
+#  ifdef CONFIG_NET_SLIP
+#    define _MIN_SLIP_MTU  MIN(_MIN_LO_MTU,CONFIG_NET_SLIP_MTU)
+#    define _MAX_SLIP_MTU  MAX(_MAX_LO_MTU,CONFIG_NET_SLIP_MTU)
+#  else
+#    define _MIN_SLIP_MTU  _MIN_LO_MTU
+#    define _MAX_SLIP_MTU  _MAX_LO_MTU
 #  endif
 
 #  define MIN_NET_DEV_MTU  _MIN_SLIP_MTU
 #  define MAX_NET_DEV_MTU  _MAX_SLIP_MTU
 
-/* For the loopback device, we will use the largest representable MTU */
+/* For the loopback device, we will use the largest MTU */
 
-#  define NET_LO_MTU        UINT16_MAX
+#  define NET_LO_MTU        MAX_NET_DEV_MTU
 
 #elif defined(CONFIG_NET_SLIP)
    /* There is no link layer header with SLIP */