diff -urp netvsc/hv_netvsc_drv_freebsd.c netvsc_mod/hv_netvsc_drv_freebsd.c
--- netvsc/hv_netvsc_drv_freebsd.c	2015-10-16 15:06:18.757227000 +0800
+++ netvsc_mod/hv_netvsc_drv_freebsd.c	2015-10-16 15:10:39.106963000 +0800
@@ -340,18 +340,10 @@ netvsc_attach(device_t dev)
 	 */
 	ifp->if_data.ifi_hdrlen = sizeof(struct ether_vlan_header);
 	ifp->if_capabilities |=
-	    IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_MTU | IFCAP_HWCSUM | IFCAP_TSO;
+	    IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_MTU | IFCAP_TSO;
 	ifp->if_capenable |=
-	    IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_MTU | IFCAP_HWCSUM | IFCAP_TSO;
-	/*
-	 * Only enable UDP checksum offloading when it is on 2012R2 or
-	 * later. UDP checksum offloading doesn't work on earlier
-	 * Windows releases.
-	 */
-	if (hv_vmbus_protocal_version >= HV_VMBUS_VERSION_WIN8_1)
-		ifp->if_hwassist = CSUM_TCP | CSUM_UDP | CSUM_TSO;
-	else
-		ifp->if_hwassist = CSUM_TCP | CSUM_TSO;
+	    IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_MTU | IFCAP_TSO;
+	ifp->if_hwassist = CSUM_TSO;
 
 	ret = hv_rf_on_device_add(device_ctx, &device_info);
 	if (ret != 0) {
diff -urp netvsc/hv_rndis_filter.c netvsc_mod/hv_rndis_filter.c
--- netvsc/hv_rndis_filter.c	2015-08-12 22:21:57.000000000 +0800
+++ netvsc_mod/hv_rndis_filter.c	2015-10-16 15:11:42.928970000 +0800
@@ -823,7 +823,7 @@ hv_rf_on_device_add(struct hv_device *de
 	int ret;
 	netvsc_dev *net_dev;
 	rndis_device *rndis_dev;
-	rndis_offload_params offloads;
+	//rndis_offload_params offloads;
 	netvsc_device_info *dev_info = (netvsc_device_info *)additl_info;
 	device_t dev = device->device;
 
@@ -867,6 +867,7 @@ hv_rf_on_device_add(struct hv_device *de
 		/* TODO: shut down rndis device and the channel */
 	}
 
+#if 0
 	/* config csum offload and send request to host */
 	memset(&offloads, 0, sizeof(offloads));
 	offloads.ipv4_csum = RNDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
@@ -882,6 +883,7 @@ hv_rf_on_device_add(struct hv_device *de
 		device_printf(dev,
 		    "hv_rf_send_offload_request failed, ret=%d\n", ret);
 	}
+#endif
 	
 	memcpy(dev_info->mac_addr, rndis_dev->hw_mac_addr, HW_MACADDR_LEN);