Wireless network connection validating identity firewalled
Before using Nmap on UNIX type systems (LINUX, BSD, and Mac OS X), you need to obtain root privileges via SUDO to use any features that cause Nmap to create custom packets.
Nmap can be run without administrative privileges, but some of the advanced scanning techniques such as SYN scanning and anything that needs to access the raw IP stack will fail.
One thing is certain about security auditing tools: The power and sophistication of tools that auditors have at their disposal increase exponentially every year.
If you execute Nmap with its default settings, and assuming you have root privileges, Nmap performs a SYN scan: Nmap sends a SYN to all of the ports listed in its services file (over 1,000 ports) and looks for a SYN/ACK response.
If it gets a response, it assumes that the port is open and immediately sends a RST (reset) to close the connection and then move on to the next port to be tested.
X OS details: Cisco Catalyst C2950 or 3750G switch (IOS 12.1 - 12.2) Network Distance: 1 hop Service Info: OS: IOS; Device: router Nmap done: 1 IP address (1 host up) scanned in 18.877 seconds Nmap provides several ways to mask your identity when scanning.
One of the more popular mechanisms is through an idle scan.
There's more to network security than just penetration testing.