Have you Enabled the init.d script to start up automatically in the right sequence on boot? There has to be a link to that script in the /etc/rc.d directory, with name S##announce where ## is the sequence number for execution after other dependencies have started.

There is a LuCI->System->Startup webpage to set up script startups (I am going by memory and am not 100% sure if that is the location of the webpage).

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