How can you assign two IP addresses to one network card using the Windows 98 OS?
Generally, you can't. Each network card has it's own unique physical MAC address imprinted on it by the manufacturer (kind of like a fingerprint or Social Security number). Although, many types of ethernet cards available today support changing the MAC address assigned to the card. The address is how a network device recognizes 'your' machine. When you log-on, a DHCP server assigns your MAC an IP address. It's not going to assign 2 IP's to the same MAC address (though on many OSs you can do this yourself).
You can, however, assign a 'static' (unchanging) IP to your machine. I suppose you could change between two IP's. Static IP's are normally for businesses that own their own server (and the IP ranges assigned to it). Your normal ISP won't allow you static IPs without a formal request.
you can however have two cards with the same ip
you can assign two ip addresses to a single interface in a Linux OS, no idea of Win 98 though.
[As mentioned above, multiple IP addresses may be assigned to a single interface in a Unix or Linux operating system (I have machines with a dozen or more IP addresses assigned to a single physical network interface), however I'm not sure such "virtual or aliased interfaces" can be created in Windows 98.
This is useful on Linux machine so that each different "virtual" IP address can be assigned a unique DNS name and accessed by that DNS name, even though, in reality, the client machine is actually just talking to the same server that is hosting dozens or thousands of other web sites under other domain names. I really don't know anything about Windows whatever, I haven't used a Windows machine since Windows 95 and I very seldom even turned that machine on. Linux worked for me then and it works for me now. *Shrug*
We can not provide the one MAC address to two PC. It is used only for the one PC per IP address.
This is a restriction with Windows98, unless you can find "special" drivers for certain network cards. WindowsXP, as well as Linux, has these facilities built in.
edit:the MAC address is unique to every network device and set at the time of manufacture.