Hi all, I solved the DHCP Problem by an older mail from Stephane Enten. The trick is to add "ip=255.255.255.255:autoconf" to /boot/fai/pxelinux.cfg/CONFFILE.
This is my (working) config file: /boot/fai/pxelinux.cfg/8D53 PROMPT 0 DEFAULT linux LABEL linux KERNEL vmlinuz-2.2.20 APPEND auto rw root=/dev/nfs nfsroot=/usr/lib/fai/nfsroot nfsaddrs=kernel ip=255.255.255.255:autoconf joerg
