Someone

ddns-update-style             ad-hoc;

option subnet-mask            255.255.255.0;
option broadcast-address      192.168.0.255;
option routers                192.168.0.1;
option domain-name-servers    192.168.0.1;
option domain-name            "ltsp";   # You really should fix this
option option-128 code 128 = string;
option option-129 code 129 = text;


get-lease-hostnames           true;

next-server                   192.168.0.1;
option root-path              "192.168.0.1:/opt/ltsp/i386";

subnet 192.168.0.0 netmask 255.255.255.0 {
    range   192.168.0.100   192.168.0.199;
   if substring (option vendor-class-identifier, 0, 9) = "PXEClient" {
        filename "lts/2.6.17.3-ltsp-1/pxelinux.0";
    }
    else{
        filename "lts/vmlinuz-2.6.17.3-ltsp-1";
    }
}