Security Basics: Re: how to find out a list of available ftp servers on LAN

[Pranay Kanwar <warl0ck () metaeye org>]

Hi,

You can fine tune nmap's performance using the --max-parallelism,
--min-parallelism, --min-rtt-timeout, --host-timeout and
other few options i'll illustrate the --max-parallelism option

1. $ time nmap -sT --max-parallelism 1 172.31.1.15


Starting Nmap 4.20 ( http://insecure.org ) at 2007-05-05 01:29 IST
Interesting ports on iws15.iiita.ac.in (172.31.1.15):
Not shown: 1687 closed ports
PORT     STATE SERVICE
21/tcp   open  ftp
22/tcp   open  ssh
111/tcp  open  rpcbind
Nmap finished: 1 IP address (1 host up) scanned in 0.800 seconds

real    0m0.804s
user    0m0.023s
sys     0m0.157s

2. $time  nmap -sT --max-parallelism 5 172.31.1.15
Starting Nmap 4.20 ( http://insecure.org ) at 2007-05-05 01:31 IST
Interesting ports on iws15.iiita.ac.in (172.31.1.15):
Not shown: 1687 closed ports
PORT     STATE SERVICE
21/tcp   open  ftp
22/tcp   open  ssh
111/tcp  open  rpcbind

Nmap finished: 1 IP address (1 host up) scanned in 0.290 seconds

real    0m0.294s
user    0m0.016s
sys     0m0.132s

As you can see the amount of time taken for execution is clearly obvious.

Regards,

warl0ck // MSG
http://www.metaeye.org