Sorry fella, had a busy week hence couldn't manage time...anyways coming to the issue., What IP address is your ADSL router assigning to the Windows BOX? (192.168.1.3 or 184.108.40.206). Also I believe Windows box has 2 nics.
Could you please elaborate
when proxy is up linux box can access internet but when it is down it can not. whether it is possible to access internet from linux when proxy is down.
Do you mean to say that when Window machine is running you are being able to access internet on Linux machine and when windows machine goes down you can't access internet on Linux box and you want to know a way to do so?
What is the IP address assigned to ADSL modem/router? How many lan ports does your router have?