Modification of LAA (Locally Administered Address) on iSCSI booted system results in Stop 0x7B on next boot

Source: Microsoft Support

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Consider the following scenario:

• You start�a computer from an iSCSI boot device.
• Change the MAC (Media Access Control)address for the network adapter used for the iSCSI boot in the Advanced tab of the adapter Properties. The field used to modify the MAC address can vary by device manufacturer, but may be called "Local Address", "Locally Administered Address", or similar.
• Reboot the computer using the same iSCSI connection.

In this scenario, you receive the following Stop error message:�

����Stop 0x0000007B (parameter1, parameter2, parameter3, parameter4)
����INACCESSIBLE_BOOT_DEVICE

When you start�a computer�from iSCSI, the configuration details for iSCSI are passed to Windows from the iSCSI boot solution (using an iSCSI boot compliant network adapter)�through the iSCSI Boot Firmware Table (iBFT) data structure. When the local address is changed, there is no mechanism to modify it on the firmware of the iSCSI boot adapter, so the two address no longer match. When this happens, a connection between the iSCSI boot initiator and the iSCSI target system cannot be established, which results in the 0x7B stop code.

Do not modify the local MAC address on an iSCSI booted port.

For more details on iSCSI boot, and the iBFT, please review the following KB article:

953528 � You may experience unpredictable results in Windows Server 2003 when you start the operating system from iSCSI

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