a gigabit lan connection between 2 pc's on a 6 pc network

I have a network with 4 pc's and 2 laptops.
I will refer Laptop 1, 2 and PC 1, 2 as A
I will refer PC 3 as B
I will refer PC 4 as C

On my network i want the computers B and C to have a special bond through a gigabit lan connection (none of the other computers support gigabit lan). Maybe an additional network between the two of them? I still want all the computers (A, B, C) on the same network, and for all of them to be able to connect to each other.

The router is D-link DL-624
Both B and C have two network cards each.
All computers have windows XP

I will use computer B as a storage computer that should always be switched on and computer C as my main computer. The other computers aren’t actually mine and must therefore not be affected the special connection between B and C.

Thank you for your ideas.

Connect a crossover cable ebtween B & C's GbE ports, assign each a static IP from a network not being used anywhere else on the LAN. Modify the hosts file on B and C with the GbE IP addresses for each. This will force them to talk over the GbE to each other, and they will still use the 100mbps to talk to everything else.

Just to let you know, that the ways that were suggested here will work. But if you have a gigabit router and have a 100MB NIC hooked up to it, then it will make ALL ports auto negotiate to 100MBs. Ya, it sucks but that is routers for you...

But yes, if you want your two gigabit computers to have a special bond then you will have to give them both an extra NIC card and assine an UNUSED IP in the network to them. That can prove to be difficult though, but I don't think that you will have any problems.

Not true in general. I've tried a number of GbE switches (unmanaged and managed) and a GbE router (which is essentially a router with a GbE switch), and have not had this problem. If you have this behaviour, you probably have a badly designed switch; it's not the norm.

There are some reports of switches having this behaviour in the past, a fair bit of misinformation out in the field and problems due to bad cables / autonegotiation / settings issues, etc. -- these are my guesses as to why this comes up from time to time.

If someone cares to mention specific switches and revisions (and testing details) showing this problem, it might help. The consumer D-Links and Netgears that I've tried have not had this problem, and I've specifically tested throughput to check this.