Maximum Transmission Unit (MTU) specifies the largest packet of data that can be transmitted on a network and ranges from 1280 to 8888 in the unit of byte. If the MTU values of two hosts are different, the transmission may be interrupted, or packet loss may occur. This section uses Windows Server 2012 R2 as an example to describe how to change the MTU value of a Windows BMS NIC.

1. Enable Jumbo Packet on the NIC.
   1. Click in the lower left corner to start Control Panel.
      Figure 1 Control Panel
      
   2. Click View network status and tasks under Network and Internet.
      Figure 2 Network and Sharing Center
      
   3. In the View your active networks area, click the target NIC, for example, Ethernet 15 shown in Figure 2.

      The page showing the Ethernet 15 NIC status is displayed.

   4. Click Properties.

      The page showing the Ethernet 15 NIC properties is displayed.

   5. Click Configure. In the displayed dialog box, click the Advanced tab.
      Figure 3 Inter(R) 82599 Virtual Function #13 Properties
      
   6. In the Settings area, select Jumbo Packet. In the Value area, select 9014 Bytes.
   7. Click OK.
2. Change the MTU value.
   1. Click in the lower left corner, choose Windows PowerShell, and run the following command to query the MTU value of the current NIC:

      netsh interface ipv4 show subinterfaces

   2. Obtain the result. The MTU value of the NIC with Jumbo Packet enabled is 9000.
      Figure 4 Obtaining the NIC MTU value
      
   3. Run the following command to change the NIC MTU value:

      netsh interface ipv4 set interface "NIC name" mtu=Changed MTU value store=persistent

      For example, to change the MTU value of the Ethernet 15 NIC to 8888, run the following command:

      netsh interface ipv4 set interface "Ethernet 15" mtu=8888 store=persistent

   4. Run the following command to query the changed MTU value:

      netsh interface ipv4 show subinterfaces

      Figure 5 Obtaining the changed MTU value