Re: Port Scanning Issues

[Vijay <zion.den@gmail.com>]

Hi Chaidre,

You could use the Connect scan option in nmap to get a more reliable 
scan. saying that i just realize that there are firewalls/load balancers 
that will respond with a SYN-ACK for every port, in that case i would 
say only when you send a data part of the connection after the ACK will 
you know if the port is really open. (people correct me if i am wrong). 
Hope it was of some help.
Regards
Vijay

crumdub12@gmail.com wrote:
> A Chairde,
>
>
>    Havin, some issues with scanning stacks on my system.
>
>
> 1. Using Superscan4 ,  I scan stack UDP-TCP 1-65534 , Sometimes I 
>
> get no ports open , another time I get 49159 UDP Ports open, only get port 
> report, no attempt made to open any ports ... , when get open ports , I always 
> get 49159 UDP Ports ...... , use the scanner at 250msecs , takes around 16 
> hours to finish.
>
>
> 2. Using Languard, Nessus and Retina , get different scans from each tool, any 
> ideas why, how do I find out real ports open.. differences can be 10,000 ports
>
>
>
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