Can't ping a Windows XP machine

I have a Windows XP (SP2) machine, two other Windows XP machines and a Linux box. The first XP box can ping, and connect to all the shares, on the network. None of the other machines can ping the first XP box, and although they can see the XP machine, they can't browse it or connect to the shares. The other machines can ping, browse and access shares amongst themselves quite happily, but since the printer is attached to the first machine, this doesn't help.

I have tried most of the obvious things - I have Norton Internet Security running on the 1st XP box, but I removed it and disabled the XP firewall, no joy. I removed all the services except TCP/IP from the network card, no difference. I have run Windows XP network diagnostics, it says it's fine. I have upgraded the network card driver - a Realtek RTL8139, no improvement. However, I don't think it's a network card issue since I plugged in a wireless network card after disabling the Realtek and exactly the same thing happened.

I believe the incoming ping requests are making it through to the Realtek network interface because if I look at the status while pinging, the number of incoming packets goes up by one with each ping, but there is nothing going out.

I'm out of ideas.

Regards,
Ian.
.

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