2 internal nets, each one with its own provider

Linux Advanced Routing and Traffic Control

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  Hi, and good evening,

  I encountered a quite weird problem yersterday evening, and I wonder
if someone can explain the way of it. Anyway, there is goes :

 I have a client running two separate networks, NET-A (10.0.1.0/24) and
NET-B (10.0.2.0/24) and two providers P-A, with gateway 192.168.0.1 and
P-B with gateway 192.168.0.2. Now, as for the hardware part of it, there
is one linux router hosting 4 ethernet cards on it, each connection
having its on ethernet device, something like this :

              
                                         
                     		           +-------------+ P-A
                                      eth0 |
                            +------+-------+
                       eth2 |     if1      |                      
               NET-A -------+              |                      
	                    | Linux router |                        
                       eth3 |              |                      
	       NET-B -------+     if2      |                      
                            |		   |
			    +------+-------+   
                                      eth1 |    
                            		   +-------------+ P-B


 Hope you get the idea. As for the configuration, what I did was :
 setup 2 new routing tables, for P-A, and P-B, added the default gws to
those tables, and setup 2 snat rules for the two networks in order to
get each of them out on a separate provider. That does not seem to work,
and I wonder if anyone has any idea why.

  Excuse me for the large email, and thankyou for your patience :)

  Cezar
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