NMAP scan problems

[Lord Doskias <lorddoskias () abv bg>]

I'm having some strange problems when I try to scan a machine. Nmap always replays that the host is down and I should 
try using the -P0 option. Alas, no luck with this. I tried all possible scanning methods. I'm using windows xp sp2, 
nmap 4.20 and winpcap 4.0 I'm having the same problem on my linux box ( connected to the same network). I think my ISP 
is doing filtrating nmap packets. When I scan with the -P0 option nmap always reports that all ports are closed, even 
for the scanme.nmap.org machine. But when I scan from an external machine it produces correct results. So what should I 
try to do in order to avoid the ISP's firellwa/ids/nids ? Any ideas. 


Regards

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