I can't use a rdr rules as solution because I don't know specific ports need to be open; so, I decided to use an external program (upnpd) and set in its conf that upnp was abilited only for 192.168.1.0/24 subnet. That resolved my problem, but I know it isn't an elegant solution. I can't do better :/
Thanks at all for helpin' me :°)
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"Non ex regula ius sumatur, sed ex iure quod est regula fiat."
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