When CentOS 6 is booted through PXE, in diskless environment for example, Dracut generates an automatic network configuration file (/etc/sysconfig/network-scripts/ifcfg-*), corresponding to the PXE interface. When invoked during boot process, /etc/init.d/network script restarts configuration of all interfaces, including the PXE one, even if the rootfs is based on NFS.
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