Difference between revisions of "Talk:Port knocking"

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For me the supplied script did not work.
 
Instead of
 
  
 
nmap -P0 --host_timeout 201 -p $2 $1 &> /dev/null
 
 
nmap -P0 --host_timeout 201 -p $3 $1 &> /dev/null
 
 
 
I use
 
 
 
nmap -PN --host_timeout 201 --max-retries 0 -p $2 $1 &> /dev/null
 
 
nmap -PN --host_timeout 201 --max-retries 0 -p $3 $1 &> /dev/null
 
 
 
The Flag P0 seems to have been renamed to PN in a more recent nmap version.
 
But the important part is max-retries. If it is not set to 0 nmap sends several TCP SYN packets to the target host. This then causes serveral knocks on Port 1 and 2 instead of just one - thus knocking 'out of order'.
 
 
Please edit if you agree - I'm not an 'expert' by all means, this are just my thoughts after examining iptables logs.
 
I'll edit the page in a few days if there is no respone - I just wanted to have feedback before I do.
 

Revision as of 13:39, 27 August 2013