Maurice - 12:14 pm on Jul 28, 2010 (gmt 0)
You can do round robin dns but the problem is you appear to be using completely the wrong approach for this. You appear to be using consumer grade dsl that optimised for downloading and not uploading
what you need to do is use an exterior routing protocol to advertise routes from both of your routers to your system.
This means that the internet knows there is two ways to get to your system if one route goes out of service the internet will use the other one.
However you need to run what in network terminology is called an AS (autonomous system) - you need to talk to your ISP to see if they offer this service and I doubt that on consumer dsl connections they will. A business SDSL ISP they might.