hello from austria!

i use a internet connection from upc (http://business.upc.at/produkte/interne ... r-internet) 100/10 MBit.

This connection includes 8 public ip addresses over a public ip via dhcp (router with multi-nat).
I suppose, that I do it also with a router board RB2011L RM.

I'm new. what should I do? how do I do that? how do I secure the router board from (firmware, Gui)internet?

thanks
rosi