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hmmm worth a try i suppose but I didnt encounter the behaviour mccarrick posts. I have ntl cable broadband with a linksys wireless router. Had been working away for months with it on cable, got the router just after xmas, plugged in and had it working in 5 minutes without it having to release any addresses. If what hes saying is true the ntl modem wouldnt have picked up the mac address of my router.
Also,when accessing the www via cable, is the cable coming from the 3 com router after going through the ntl box? that would further dispove the theory. (not trying to knock his suggestion, i just cant see how its true based on my experience)
One other thing he notes that I did too, and it that could be key, was to set it up intially without any security and then build your level up from there.
Post back anyway, always interested to see probs i may encounter myself.