question would be better asked in the XP forum. I found the same thing as you by googling.
Sygate tells us that NTKernel System (ntoskrnl.exe) is trying to send ICMP Type 8 (Echo request) packet to our PC.
Do I want to allow this? What is it?
I did a google search and one of the links indicates it is critical in the bootup process of our PC.
If so, why is our PC booting up ok without it?