Dhcp problem...what is the msitake?

[Jesus arteche]

hey,

I've implemented a dhcp server,  I want to cretae several subnets inside the
same subnet using net mask, at teh same time i want to give the ip by mac.
The problem is that when  the server get the mac dont give the correct ip to
the client, its like i didnt define it in conf file. The syslog shows how
the petition arrives but later the server dont give it the correct ip. Thats
my conf, can someone help me?:


server-identifier servidor;
option domain-name "loquesea.es";
#option nis-domain "loquesea.es";
option routers 192.168.5.3;
#option subnet-mask 255.255.255.0;
#option nis-servers <IP servidor NIS, si tienes>;
option domain-name-servers 192.168.5.3;
#option ntp-servers <IP NTP server>; # pool.ntp.org
default-lease-time 8640000;
next-server 192.168.5.3;
filename "pxelinux.0";
#filename "boot.bin"
subnet 192.168.5.0 netmask 255.255.255.192 {range 192.168.5.1 192.168.5.63;
    option broadcast-address 192.168.5.255;
    option routers 192.168.5.3;
    option domain-name-servers 192.168.5.3;
    next-server 192.168.5.3;
    filename "pxelinux.0";
#filename "boot.bin";

    default-lease-time 600;
    max-lease-time 71200;}

subnet 192.168.5.64 netmask 255.255.255.192 {range 192.168.5.65
192.168.5.123;
    option broadcast-address 192.168.5.255;
    option routers 192.168.5.3;
    option domain-name-servers 192.168.5.3;
    next-server 192.168.5.3;
    filename "pxelinux.0";
#filename "boot.bin";

    default-lease-time 600;
    max-lease-time 71200;}

group {
    host prueba1
    {
         #KUBUNTU
         hardware ethernet xx:xx:xx:xx:xx:50;
         fixed-address 192.168.5.7;
         option domain-name-servers 192.168.5.3;
         option host-name "prueba1";
    }

  host prueba2
    {

         hardware ethernet xx:xx:xx:xx:xx:51;
         fixed-address 192.168.5.2;
         option domain-name-servers 192.168.5.3;
         option host-name "prueba2";
    }

}

group {
    host prueba3
    {
         #KUBUNTU
         hardware ethernet xx:xx:xx:xx:xx:54;
         fixed-address 192.168.5.66;
         option domain-name-servers 192.168.5.3;
         option host-name "prueba3";
    }

  host prueba4
    {

         hardware ethernet xx:xx:xx:xx:xx:55;
         fixed-address 192.168.5.2;
         option domain-name-servers 192.168.5.3;
         option host-name "prueba4";
    }

}

thanks