On a Windows host (tried Windows 7 圆4 with VirtualBox 4.3.31-101940 and Windows 10 圆4 with versions up to and including 5.0.51-102781) the PXE boot ROM successfully gets an IP address from the DHCP server but the guest Linux kernel doesn't it just sits sending DHCP requests which never get responded to. The Linux kernel boots, gets the same IP address allocated again and mounts the correct NFS file system. Configuration file specifies the guest Linux kernel command line to include ip=dhcp along with a bunch of NFS root file system stuff. On a Linux host (CentOS 6.7 running VirtualBox 4.3.31-101940 the boot process proceeds as follows: PXE Boot ROM gets IP address from DHCP server, runs the pxelinux.0 file to get the correct configuration file. A virtual machine is setup with a bridged Ethernet adapter (Intel Pro/1000 MT Desktop) and configured to remote boot using the PXE boot ROM.
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