Can I use pxelinux to boot from an ISOs over the network?

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http://unix.stackexchange.com – I have a server which hosts mirrors for FreeBSD, CentOS and Scientific Linux. It includes .iso files. Is it possible to use pxelinux to boot this ISO over the network? Must I use gPXE or iPXE instead? I have seen some indication that this is possible, but I'm not sure that I trust that forum post, as I have not gotten this to work. I have the following configuration: LABEL freebsd-install-net MENU LABEL Netboot FreeBSD-8.2-RELEASE-amd64-disc1.iso KERNEL memdisk APPEND iso raw initrd= But pxelinux tells me the following: Loading memdisk.... C (HowTos)