I'm sorry, I should have given more details in the first post.
I'm planning to set up a linux-based Internet gateway to my Comcast ISP (through a cable modem), but the PC I have in mind (Dell Dimension 4500, which I equipped with a DVD drive) has only one NIC (an on-board one).
I already have a 50' CAT 6 UTP crossover cable (an orange one, manufactured by cablesunlimited.com; I can describe it in more detail later today if needed), so I will need to buy just one more NIC and should be ok. I'm not sure what kind of NIC to buy either; a "10/100" or a "10/100/1000" (gigabit) one.
The other PC is a HP Pavilion a1330n with Windows XP Pro on it (but I'm thinking of making it dual-bootable later on; my university relies heavily on Microsoft's software), and it also has only one on-board NIC, so I want to connect it to the Dell Dimension PC via the crossover cable.
I'm guessing that if one of the on-bard cards is 10/100 than all the LAN will be 10/100 regardless of whether I buy a regular 10/100 or a gigabit NIC. Am I correct here?
As for the NIC described by Fry's as: "TRENDnet PCITXR 32-bit 10/100/1000Mbps PCI adapter", can anyone confirm it's the one described here?