You can set your connection as Public then. DD-wrt is actually a software or better a firmware which will overwrite your routers default one and provides more functions. Comodo or OA would be sufficient i suppose.

I am not really a network guy anyway as I said pls check how to geek.com as they have a lot of guides for router configs.

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Senior Raul I am not sure which router are u planning to buy can you explicitly specify pls. ?