Actually u only really have 5 ips since 3 are unusable. The previous poster thinks you only
have one IP and he is recommending a broadband router. They have some benefits but you don’t need to spend that much. All you need to buy is a simple network hub.
There are two speeds - 10MB hubs and 10/100MB hubs and # of ports vary depending on how many machines u wish to connect - a 4 port is good enough in your case (really it is 5 ports but the uplink port doesn’t really count since that is the port that the ADSL line connects to).
The 10MB 4/5 port hub will be the cheapest since windows can’t transfer that fast anyway. You should be looking for a price under NT$1,000 nowadays.
If you prefer to buy the broadband router I suggest you reduce your 8 IP connection down
to a single IP connection and save some dosh.