iPXE commandchain http://mirror1.ipfire.org/releases/ipfire-boot/latest/undionly.kpxechain http://mirror1.ipfire.org/releases/ipfire-boot/latest/gpxe.kpxe
Links
http://wiki.ipfire.org/de/installation/pxe
http://mirror1.ipfire.org/releases/ipfire-boot/latest/
http://planet.ipfire.org/post/introduction-to-boot-ipfire-org
Update pxe configuration
wget http://installit.googlecode.com/hg/preseed/preseed.squeeze.amd64.conf -O /var/lib/tftpboot/pxelinux.cfg/preseed.squeeze.amd64.conf
wget http://installit.googlecode.com/hg/preseed/preseed.wheezy.amd64.conf -O /var/lib/tftpboot/pxelinux.cfg/preseed.wheezy.amd64.conf
wget http://installit.googlecode.com/hg/preseed/preseed.precise.i386.conf -O /var/lib/tftpboot/pxelinux.cfg/preseed.precise.i386.conf
wget http://installit.googlecode.com/hg/preseed/preseed.precise.amd64.conf -O /var/lib/tftpboot/pxelinux.cfg/preseed.precise.amd64.conf