I am just wondering if its possible that linux (fedora core 5) dhcp server could do reservations? if so how does one go about setting it up ?

first of all

1.) install the dhcpd service
2.) edit the dhcpd.conf like:

option routers xx.xx.xx.xx;
option netbios-name-servers xx.xx.xx.xx;
option netbios-dd-server xx.xx.xx.xx;
option netbios-node-type 8;
option ntp-servers xx.xx.xx.xx;


subnet 10.0.0.0 netmask 255.0.0.0 {
default-lease-time 432000;
max-lease-time 604800;

pool {
deny dynamic bootp clients;
range 10.40.40.1 10.40.40.254;
filename "pxelinux.0";

}
}

ddns-update-style ad-hoc;

3.) If you want to fix a host use:

host hostname {
hardware ethernet MAC-address;
fixed-address ip-address; }

thanks very much