Hello Jan, thank you for your answer..

I have inserted rt_loopback module. 
That's ok. 
After that, on my windows box, I can ping : 
151.157.3.3 (which is my default gateway)
151.157.3.4 
152.157.1.1 
152.157.1.2 

But there is a problem.. In fact, when I ping 152.157.1.2, my board responds 
but not the destination host.. ping request are never sent to the destination 
box..  So how can I do for forwarding packets to the destination box?   
Have you got any idea about my problem? 

My configuration is the following : 
# rtroute
Host Routing Table
Hash    Destination     HW Address              Device
00      0.0.0.0         00:00:00:00:00:00       rtlo
00      151.157.1.128   00:0F:B5:42:73:4A       rteth0  =====> input interface 1
01      127.0.0.1       00:00:00:00:00:00       rtlo
01      152.157.1.1     00:00:00:00:00:00       rtlo
02      152.157.1.2     00:30:64:02:DC:1A       rteth2 ====> output interface 
03      151.157.3.3     00:00:00:00:00:00       rtlo
04      151.157.3.4     00:00:00:00:00:00       rtlo
3F      152.157.255.255 FF:FF:FF:FF:FF:FF       rteth2
3F      151.157.255.255 FF:FF:FF:FF:FF:FF       rteth1 ======> input interface 2

Network Routing Table
Hash    Destination     Mask                    Gateway
*       151.157.0.0     255.255.0.0             151.157.1.128
*       152.157.0.0     255.255.0.0             152.157.1.2



# rtifconfig
rteth0    Medium: Ethernet  Hardware address: 00:14:6C:8C:33:FA
          IP address: 151.157.3.3  Broadcast address: 151.157.255.255
          UP BROADCAST RUNNING  MTU: 1500

rteth1    Medium: Ethernet  Hardware address: 00:14:6C:8C:36:D0
          IP address: 151.157.3.4  Broadcast address: 151.157.255.255
          UP BROADCAST RUNNING  MTU: 1500

rteth2    Medium: Ethernet  Hardware address: 00:E0:0C:00:00:FD
          IP address: 152.157.1.1  Broadcast address: 152.157.255.255
          UP BROADCAST RUNNING  MTU: 1500

rtlo      Medium: Local Loopback
          IP address: 127.0.0.1
          UP LOOPBACK RUNNING  MTU: 1500

Here is the diagram of the test :
                                 _ _ _ _                   _ _ _ _ _
                                |       |                 |             |
                                |         | =======> 1|MPC 8560 |
       Windows box ===> |hub      | =======> 2| ADS     |4 ======>  Destination 
host  
          (non-rt)              |         |               |(rtnet)      |       
         
                                |_ _ _ _|                 |_ _ _ _ _|           
                                     


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