problem with Kickstart and network

[Pierre Etzel <petzel@xxxxxxxxxxxx>]

hi
I have got a little problem with kickstart, during the installation the 
pc don't ask me anything for the network and i don't understand why .
here is my ks.cfg
#Generated by Kickstart Configurator
lang en_US
langsupport en_US
keyboard fr
mouse none
timezone --utc Europe/Luxembourg
reboot
text
bootloader --useLilo --linear --location=mbr
install
cdrom
auth  --useshadow  --enablemd5
firewall --disabled
#Do not configure the X Window System
skipx
%packages
RTLlos

Thanks in advance for your help