Networking :: setenv DISPLAY

I have a slight problem with my network connection. I want to use my DSL box as a remote terminal on my desktop (SuSE9.2).

On my DSL-box I type :
>> ssh user@192.168.2.127  # IP of SUSE box
>> ////password////
>> xterm

An xterm duly opens on the screen of my SUSE box

When I type :
>> ssh user@192.168.2.127
>> /////password////
>> setenv DISPLAY 192.168.2.1:0.0  # IP of DSL box
>> xterm

I get the message :
xterm Xt error : Can't open display : 192.168.2.1:0.0


In the other direction it is the same problem : from SUSE I can open an xterm on DSL, but not redirect it back to SUSE.

It all used to work between 2 SUSE boxes. What is different with DSL ?

Thanks for suggestions.