Thanks to all for the replies. Will try what you said flash.
Also i teste the card on an old laptop i have to discard a defective card, but the card works flawlessy in this laptop and i managed to get into my lan at first attempt so the card is working, phew!.
I'm thinking that the problem could be on the amiga software(miami), that is doing anything that f*** the whole thing.
Are there some default settings that miami leave active and should be disabled?. Also i tried with the gateway option of miami on and off without luck.
Still seeking a solution, thanks guys, i hope with your help it gets connected once for all.