Index: sys/dev/virtio/network/if_vtnet.c
===================================================================
--- sys/dev/virtio/network/if_vtnet.c
+++ sys/dev/virtio/network/if_vtnet.c
@@ -207,6 +207,7 @@
 static void	vtnet_ifmedia_sts(struct ifnet *, struct ifmediareq *);
 static void	vtnet_get_hwaddr(struct vtnet_softc *);
 static void	vtnet_set_hwaddr(struct vtnet_softc *);
+static void	vtnet_get_mtu(struct vtnet_softc *sc);
 static void	vtnet_vlan_tag_remove(struct mbuf *);
 static void	vtnet_set_rx_process_limit(struct vtnet_softc *);
 static void	vtnet_set_tx_intr_threshold(struct vtnet_softc *);
@@ -268,6 +269,7 @@
 	{ VIRTIO_NET_F_CSUM,		"TxChecksum"	},
 	{ VIRTIO_NET_F_GUEST_CSUM,	"RxChecksum"	},
 	{ VIRTIO_NET_F_MAC,		"MacAddress"	},
+	{ VIRTIO_NET_F_MTU,		"MtuAdvice"	},
 	{ VIRTIO_NET_F_GSO,		"TxAllGSO"	},
 	{ VIRTIO_NET_F_GUEST_TSO4,	"RxTSOv4"	},
 	{ VIRTIO_NET_F_GUEST_TSO6,	"RxTSOv6"	},
@@ -635,6 +637,10 @@
 	if (virtio_with_feature(dev, VIRTIO_RING_F_EVENT_IDX))
 		sc->vtnet_flags |= VTNET_FLAG_EVENT_IDX;
 
+	if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) {
+		sc->vtnet_flags |= VTNET_FLAG_MTU;
+	}
+
 	if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) {
 		/* This feature should always be negotiated. */
 		sc->vtnet_flags |= VTNET_FLAG_MAC;
@@ -977,6 +983,10 @@
 
 	ether_ifattach(ifp, sc->vtnet_hwaddr);
 
+	/* Set intial MTU */
+	vtnet_get_mtu(sc);
+	ifp->if_mtu = sc->vtnet_mtu;
+
 	if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS))
 		ifp->if_capabilities |= IFCAP_LINKSTATE;
 
@@ -3682,6 +3692,22 @@
 		sc->vtnet_hwaddr[i] = virtio_read_dev_config_1(dev,
 		    offsetof(struct virtio_net_config, mac) + i);
 	}
+}
+
+static void
+vtnet_get_mtu(struct vtnet_softc *sc)
+{
+	device_t dev;
+
+	dev = sc->vtnet_dev;
+
+	if ((sc->vtnet_flags & VTNET_FLAG_MTU) == 0) {
+		sc->vtnet_mtu = ETHERMTU;
+		return;
+	}
+
+	sc->vtnet_mtu = virtio_read_dev_config_2(dev,
+			offsetof(struct virtio_net_config, mtu));
 }
 
 static void
Index: sys/dev/virtio/network/if_vtnetvar.h
===================================================================
--- sys/dev/virtio/network/if_vtnetvar.h
+++ sys/dev/virtio/network/if_vtnetvar.h
@@ -151,6 +151,7 @@
 #define VTNET_FLAG_MULTIQ	 0x0200
 #define VTNET_FLAG_INDIRECT	 0x0400
 #define VTNET_FLAG_EVENT_IDX	 0x0800
+#define VTNET_FLAG_MTU		 0x1000
 
 	int			 vtnet_link_active;
 	int			 vtnet_hdr_size;
@@ -180,6 +181,7 @@
 	struct mtx		 vtnet_mtx;
 	char			 vtnet_mtx_name[16];
 	char			 vtnet_hwaddr[ETHER_ADDR_LEN];
+	uint16_t		 vtnet_mtu;
 };
 
 /*
@@ -278,6 +280,7 @@
 /* Features desired/implemented by this driver. */
 #define VTNET_FEATURES \
     (VIRTIO_NET_F_MAC			| \
+     VIRTIO_NET_F_MTU			| \
      VIRTIO_NET_F_STATUS		| \
      VIRTIO_NET_F_CTRL_VQ		| \
      VIRTIO_NET_F_CTRL_RX		| \
Index: sys/dev/virtio/network/virtio_net.h
===================================================================
--- sys/dev/virtio/network/virtio_net.h
+++ sys/dev/virtio/network/virtio_net.h
@@ -36,6 +36,7 @@
 /* The feature bitmap for virtio net */
 #define VIRTIO_NET_F_CSUM	0x00001 /* Host handles pkts w/ partial csum */
 #define VIRTIO_NET_F_GUEST_CSUM 0x00002 /* Guest handles pkts w/ partial csum*/
+#define VIRTIO_NET_F_MTU	0x00008 /* Host has MTU advice */
 #define VIRTIO_NET_F_MAC	0x00020 /* Host has given MAC address. */
 #define VIRTIO_NET_F_GSO	0x00040 /* Host handles pkts w/ any GSO type */
 #define VIRTIO_NET_F_GUEST_TSO4	0x00080 /* Guest can handle TSOv4 in. */
@@ -68,6 +69,7 @@
 	 * Legal values are between 1 and 0x8000.
 	 */
 	uint16_t	max_virtqueue_pairs;
+	uint16_t	mtu;
 } __packed;
 
 /*