• what I would actually do is let the router do the DHCP , I used to have one of those routers and they run it well. However getting into the modem is obviously a problem to disable it! I would imagine that the router is handling your encryption as the modem isnt capable of that part.
    That might have a lot to do with your ip issues tho, the modems just arent built to run DHCP well. The setup I have is the modem plugs into the router, then all the internal IP addressing and encryption is handled on the router.
    Is there no way you can ring your ISP and get the password of the router - or failing that get the modem hard reset and putting the login details back in, that wouldnt be too hard.

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