Linux IPTables -> is it possible?

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http://www.unix.com – Hi! I have a dedicated hosting working with 2 ips. Is it possible to block all connections but 1 in all existing ports for only 1 of my ips? I mean like, I have 2 ips for example: 190.x.x.5 and 190.x.x.6 I want that all the connections going to 190.x.x.6 in all ports get rejected but only 1 connection, my laptop ip which is (example) 80.x.x.1 (HowTos)