cain & abel full routing

[Alex <quick.touch () gmail com>]

why when i use cain&abel and try to perform a man-in-the-middle-attack between the gateway and a test host, i only get 
half-routing and i only see what the test host transmits to the gateway, but not what the gateway transmits to the test 
host? 

IP are allocated after MAC addresses, so the server knows exactly what mac address is allocated to the ip that i'm 
using as a test host.
i thought that a possibility to get what the gateway sends to the test host is to change my mac (i used smac) into the 
mac of the test host, but it didn't work as a full routing (i'm not sure but i think i was able to see what the gateway 
sent to the test host, but not what the test host sent to the gateway). 
is there any way of performing a full man-in-the-middle attack in this scenario?

i saw this example http://shsc.info/ARPPoisoning and he achieved there a full routing between a host on the network and 
one that's over Internet.. (or i might be wrong, because lower in the WAN View he is doing a half-routing with hosts 
that are over Internet) 


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