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There are no special instructions for configuring a Gateway. Some DDWRT builds are flawed, and the way to find out is to telnet the router and see if chilli is running. If it is not, then try to start it manually, if you get an error that most likely means the build is flawed. (this is provided you have configured the router properly as per the setup instructions)

You can find a plethora of information on DDWRT builds/compatibility issues on their forums: http://www.dd-wrt.com/phpBB2/