ipconfig: eth0: SIOCGIFINDEX: No such device
ipconfig: no devices to configure
/init: .: 1: can't open /tmp/net-eth0.conf

pxelinux.cfg below

LABEL linux
       kernel vmlinuz-2.6.22-14-generic
 append root=/dev/nfs nfsroot=192.168.1.10:/core2frontend/nfsroot ip=dhcp initrd=initrd.img-2.6.22-14-generic rw

TIMEOUT 0