Thanks to you both for the suggestions. In fact I'd already tried the 192.168.X.X addresses before setting them to 10.0.0.1 and 10.0.0.2. I've used subnet masks of 255.0.0.0 and 255.255.255.0 but still no joy.
The actual hardware link seems to be working. For example, I can set the link speed on either machine (to 10Mb/s or 100Mb/s) and both machines report the correct link speed. Also, if I remove the cable, both machines report the cable as unplugged and both of them respond when the cable is plugged back in again. The only oddity which I discovered after my original post is that if I ping machine 1 from machine 2, the 'transmit' icon on machine 2's system tray will immediately light up. However, nothing at all happens if I try to ping machine 2 from machine 1. It's as though the hardware is working but somehow, the software can't communicate with it.
I found some info on another forum from someone who described the same problem and said he had fixed it by uninstalling TCP/IP and then re-installing it. Althouh he described a procedure for doing this, he reckons that it won't work for Windows XP. Do either of you know how to do this for XP?
Thanks,
John
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