Well he/she said is new to Ethical Hacking. The basic advice I can give you is the ethical definition. Bringing down a network doesn't proves anything. You could easily cross wires of the electric outlet and get exactly the same results, even more effective.

If you really want to be an ethical hacker notify the possible target, manufacturers and OS developers their vulnerabilities first and help them build a more secure network.

In reply to Re: ARP spoofing attack ---- Advice Needed by bluescreen
in thread ARP spoofing attack ---- Advice Needed by sagarkha

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