nmap 5.21 sends protocol unreachable

[Derek <depierjack () msn com>]

Hi, 

I am running Windows 7 64-bit and I was curious about how internet hosts would respond to the three different ICMP 
pings that nmap supports, I also had wireshark running while performing these pings. I noticed that after receiving a 
reply, I would see ICMP Protocol Unreachable packets being sent to the replying host from my machine, while using the 
windows ping program this did not happen so I am assuming nmap is sending these packets. So my question is why is nmap 
doing this and if not nmap, why is it happening. I have the nmap network scanning book and I don't recall reading 
anything about nmap sending this type of packet, but actually looking for this type of response when performing an IP 
protocol scan. Any thoughts would be appreciated.
 
Derek                                     
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