Nmap Pingscan - ignore reset

[Simon Gfeller <simu () simuonline ch>]

Hello together,

I had a problem with the pingscan already a few times when I had to 
discover hosts in a subnet. I use -PS with a few top ports like 80, 443 
etc.
But sometimes, if there is a firewall which sends tcp resets on specific 
ports even if there is no host, I have a lot of fals positives, because 
nmap recognises hosts with a tcp reset as online.

Is there a way to ignore reset packages during a ping/discovery scan? If 
not, is it possible to add such an option or was it already discussed? 
Or do you know alternatives?

Thank you!

Best regards,
Simon
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