If KickStart is told to configure via DHCP, the "nfs --server" has no effect and always tries to mount from the DHCP server.
I could not get this to fail on our test network with a standard 6.0 install. Here is the kickstart file that I used. lang en network --bootproto dhcp nfs --server 10.0.0.1 --dir /mnt/dist/6.0/i386 device ethernet tulip keyboard us clearpart --all zerombr yes part / --size 500 part swap --size 128 part /usr --size 2 --grow part /home --size 2 --grow install mouse --kickstart generic3ps/2 timezone --utc US/Eastern xconfig --monitor "tatung cm14uhe" rootpw password auth --useshadow --enablemd5 lilo --location mbr %packages @ Workstation #autofs #portmap #ypbind #yp-tools #rsync #open #xntp3 %post echo 'Kickstart $Revision: 1.2 $' `date` > /etc/motd