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4.2.3. Multiple NICs and PXE Installation

Some servers with multiple network interfaces may not assign eth0 to the first network interface as BIOS knows it, which can cause the installer to try using a different network interface than was used by PXE. To change this behavior, use the following in pxelinux.cfg/* config files:
IPAPPEND 2 
APPEND ksdevice=bootif

The configuration options above causes the installer to use the same network interface as BIOS and PXE use. You can also use the following option:
ksdevice=link

This option causes the installer to use the first network device it finds that is linked to a network switch.