Xen users - Aug 2007 - Can''t get NAT access to internet from Dom U in my small network

I have followed the nat advice from this guide:
http://wiki.kartbuilding.net/index.php/Xen_Networking#Routed_Networking_with_NAT_2

I have googled internet for weeks and read almost every thread in this forum
without getting a working NAT on my system.
My main question is how exactly will the  iptable rules with MASQUERADE or
POSTROUTING  look like if you want access to the internet from Dom U , Dom 0
and  computer 2.

My setup
Dom 0 #Host computer with internet access
Dom U # Virtual image Debian GNU/Linux 3.1 
computer 2 # Host computer with internet access only through Dom 0

xend-config.spx
(network-script network-nat)
(vif-script     vif-nat)


 vm01.cfg  
# Network
hostname = ''rush''
vif = [''ip=10.0.0.1'']
dhcp = ''off''
ip = ''10.0.0.1''
netmask = ''255.255.255.255'' #Is this the correct netmask ?
gateway = ''10.0.0.254''

Dom U : /etc/network/interfaces

 # The primary network interface
 auto eth0
 iface eth0 inet static

address  10.0.0.1
netmask  255.255.255.0
gateway  10.0.0.254


ifconfig Dom 0
eth0   inet addr:239.324.35.24  Bcast:239.324.35.255  Mask:255.255.255.0        
eth1    inet addr:192.168.0.1  Bcast:192.168.0.255  Mask:255.255.255.0          
vif6.0    inet addr:10.0.0.128  Bcast:0.0.0.0  Mask:255.255.255.255

    
netstat -rn Dom 0
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt
Iface
10.0.0.1        0.0.0.0         255.255.255.255 UH        0 0          0
vif6.0
192.168.0.0     0.0.0.0         255.255.255.0   U         0 0          0
eth0
 239.324.35.0    0.0.0.0         255.255.255.0   U         0 0          0
eth0
 0.0.0.0        239.324.35.1       0.0.0.0         UG        0 0          0
eth0


ifconfig Dom U
eth0      inet addr:10.0.0.1  Bcast:10.0.0.255  Mask:255.255.255.0     
lo          inet addr:127.0.0.1  Mask:255.0.0.0
 
netstat -rn Dom U
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt
Iface
10.0.0.0        0.0.0.0         255.255.255.0   U         0 0          0
eth0
0.0.0.0         10.0.0.254      0.0.0.0         UG        0 0          0
eth0

    

ps. Believe me  I have tried every tips  I have read about this, but they
where very advanced.I have tried with different netmasks without
success.Help would be deeply appreciated!


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