4. If you use IPv6, select  Internet Protocol Version 6 (TCP/IPv6)  and click  Properties .  Otherwise, select  Internet Protocol Version 4 (TCP/IPv4)  and click  Properties  to  configure an IPv4 address. 5. For IPv4, the window that is shown in Figure 5-16 opens. To manually set the IP, select  Use the following address  and enter an IP address, subnet mask, and gateway. Set the  DNS server address, if required. Click  OK  to confirm. 6. Repeat these steps for each port that you want to configure for iSCSI attachment. 1. In the search field of the Windows Start window, enter  regedit  and click  regedit.exe . 2. In the registry editor, locate the following key: 3. In the registry editor, locate the following key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E97B-E325-11CE-B FC1-08002BE10318}\< bus ID >\Parameters\MaxRequestHoldTime Confirm that the value for the  MaxRequestHoldTime  key is  120  (decimal value) and, if not,  change the value to  120 . Confirm that the value for the  LinkDownTime  key is  120  (decimal value) and, if not, change  the value to  120 . HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E97B-E325-11CE-B FC1-08002BE10318}\< bus ID >\Parameters\LinkDownTime Complete the following steps to modify the system registry so that your iSCSI operations are  more reliable: The Ethernet ports are now prepared for iSCSI attachment. Figure 5-16 Configuring an IPv4 address in Windows 2012 R2 Setting the Windows registry keys Chapter 5. Host configuration  231