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What is the need for firewall to be in "stealth mode"?

If the attacker knows the firewall model, it's easier to find exploits to it and bypass it. If the version is known, the job is even easier. On a stealth firewall, the attacker may not even suspect ...
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What are the drawbacks of a stealthy port scan?

TCP SYN scan needs to create a raw socket that requires root access. As Nmap document says: SYN scan may be requested by passing the -sS option to Nmap. It requires raw-packet privileges, and is the ...
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