There have been a few threads of late where people are having problems getting DSL/Cable routers to work behind ADSL modems or routers. I have tried to help a few times but appreciate typed instructions of required configurations can be very confusing! On the principle "a picture paints a thousand words", I have put a diagram on my webspace:
This all came about because the manufacturer's helpdesk for my Belkin Wireless DSL/Cable Router told me it was not possible to use it behind an existing ADSL router. Once I had drawn it all out the penny soon dropped as to how to configure it!
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