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Hey again,
decided to solve the problem by using an embedded system along the way and a mini-usb cable to receive the data from my hokuyo since it looks like it's difficult for urg_node to communicate with my laser through a ethernet-to-usb converter. (Reads the data through /dev/ttyUSB0 but it has some weird troubles like not being able to shut the node down :? )
so just decided to give an update on this post and close it, feel free to ask any other related questions about urg_node and hokuyo connection from me :)

Best of luck to you all