Nmap Development mailing list archives
Re: Speeding up single ports scans over large networks
From: Fyodor <fyodor () insecure org>
Date: Thu, 18 Sep 2003 18:29:45 -0700
On Fri, Sep 19, 2003 at 12:35:51AM +0100, testic wrote:
I have recently been wanting to scan largest networks to discover if a single port is open. I have found that this seems to be exceedingly slow,
I'm not sure if it is documented, but Nmap has a special turbo mode to do this quickly. Do: nmap -PS[portno] -sS[portno] -T4 -n [network addresses] Where 'portno' is the port you wish to scan. In this case, the 'ping scan' is sending a SYN to the port anyway, and so Nmap is smart enough to skip the SYN scan because it already has the results from the ping scan. Cheers, -F --------------------------------------------------------------------- For help using this (nmap-dev) mailing list, send a blank email to nmap-dev-help () insecure org . List run by ezmlm-idx (www.ezmlm.org).
Current thread:
- Speeding up single ports scans over large networks testic (Sep 18)
- Re: Speeding up single ports scans over large networks Fyodor (Sep 18)
- Re: Speeding up single ports scans over large networks Fyodor (Sep 18)
- <Possible follow-ups>
- Re: Speeding up single ports scans over large networks testic (Sep 18)
- Re[2]: Speeding up single ports scans over large networks Bo Cato (Sep 18)
- Re: Speeding up single ports scans over large networks testic (Sep 18)
- Re: Speeding up single ports scans over large networks Fyodor (Sep 18)