then finally a rounter using IP c to enable another three computers sharing internet connection.
All three IP addresses are in the same network.
My questions, how can I enable all the three computer under the router to sharing the printer that connected to computer A? Is it possible?
Rockape, my assumption on the location of three of the PCs in a different subnet was based on the above quote. The three PCs are sharing a single IP (c) through the router and so must be in a different subnet to the other PCs and indeed the printer.
piglet, if you do not have a print server device or are not willing to get one, you can restructure your network by putting all the computers behind the router so that they all share one address. That way they will all be on the same subnet and you will not have any NETBIOS problems.
This should not be a problem unless you want to isolate the PCs from each other for some reason. I know this will mean only one of your three allocated IP addresses, but if all you're doing is accessing the internet, a basic NAT router should do the job.
