Router will issue IP addressing to each computer. This is what DHCP does. If you don't have router, you can assign IP address to each computer. You need to make sure you use different IP for each computer. There are addressing rangers for LAN networks, one starting with 192.168.0.0 all the way to 192.168.0.254
or you can use 10.0.0.0 The subnet mask for this one is 255.0.0.0
The 192.168.0.1 subnet mask is 255.255.255.0
Depending on Operating system there are different ways to assign the IP addressing. Right click (and Properties) on the Network icon will get you started.
In a manner of speaking the router sort of "assigns" an IP address, but you still have the (static) IP your ISP gave you. This of course may depend on the ISP. Like most on a router, my "IP" is 192.168.**** but my real IP (74.******) still shows in sent email headers, and at any site that can record and display an IP. But in my case I didn't have to enter any of this IP info on XP. Once the router was hooked up, nothing had to be done, it was all setup automatically.
But until the OP shows up again with (much) requested info, I don't see the point in continuing further.![]()
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Without using a router internet connection can be shared by using two LANs. At that time your PC will be act like a router, got that?
And I am using a dial up USB modem but it needs not to be connect every time when I start my PC if I always plug in the USB modem. This ISP provides me two series of dynamic IPs. One 172.xxx.xxx.xxx and 180.xxx.xxx.xxx
We still need these questions answered:
- What networking interfaces do each of the 4 Desktop PCs, 2 Laptops, and one printer presently have?
- Will any of the machines be sufficiently close together and in fixed positions so as to make wired connections feasible?
- Which computers will need access to the printer?
- What operating systems are on each of the 6 computers.
As for I'net connectivity, you are not going to be able to have access from all machines using a single dial-up line without adding a multiplexer between them and the modem.