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I have used NMAP in past and know very well that how problematic it can become. in some cases it can be too late too. Anyway i will check the tutorial section for that.

thank you all.

Thanks a lot to all of you. I understood the fact. Now can someone tell me if it fine to use it for scanning my home network with it?

Will using it to scan external IPs be against Law? I wanted...

I know that this may be this may be quite annoying for some experts ... hopefully annoying enough to flame me. But I have heard too much about nessus. This thing comes along with many Linux distros....