The actual dhcp.conf is this:
host memos {
    hardware ethernet xx:xx:xx:xx:xx:xx;
    option root-path 
"xx.xx.xx.xx:/nfsroots/memos-testing,rw,intr,hard,tcp,wsize=32768,rsize=65536";
    fixed-address xx.xx.xx.xx;
}
The first i sended was from an older setup and the server runs with squeeze.