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  2. Christmas tree packet - Wikipedia

    en.wikipedia.org/wiki/Christmas_tree_packet

    When used as part of scanning a system, the TCP header of a Christmas tree packet has the flags FIN, URG and PSH set. [1] Many operating systems implement their compliance with the Internet Protocol standards [2] [3] in varying or incomplete ways. By observing how a host responds to an odd packet, such as a Christmas tree packet, inferences can ...

  3. Idle scan - Wikipedia

    en.wikipedia.org/wiki/Idle_scan

    This script probes a host to classify its IP ID generation method, then prints the IP ID classification much like the OS detection does. Like most NSE scripts, ipidseq.nse can be run against many hosts in parallel, making it another good choice when scanning entire networks looking for suitable hosts. nmap -v -O -sS 192.168.1.0/24

  4. Penetration test - Wikipedia

    en.wikipedia.org/wiki/Penetration_test

    A penetration test can help identify a system's vulnerabilities to attack and estimate how vulnerable it is. [7] [5] Security issues that the penetration test uncovers should be reported to the system owner. [8] Penetration test reports may also assess potential impacts to the organization and suggest countermeasures to reduce the risk. [8]

  5. Nmap - Wikipedia

    en.wikipedia.org/wiki/Nmap

    Nmap (Network Mapper) is a network scanner created by Gordon Lyon (also known by his pseudonym Fyodor Vaskovich). [5] Nmap is used to discover hosts and services on a computer network by sending packets and analyzing the responses.

  6. TCP/IP stack fingerprinting - Wikipedia

    en.wikipedia.org/wiki/TCP/IP_stack_fingerprinting

    "don't fragment" flag (1 bit) "sackOK" flag (1 bit) "nop" flag (1 bit) These values may be combined to form a 67-bit signature, or fingerprint, for the target machine. [1] Just inspecting the Initial TTL and window size fields is often enough to successfully identify an operating system, which eases the task of performing manual OS ...

  7. TCP reset attack - Wikipedia

    en.wikipedia.org/wiki/TCP_reset_attack

    A TCP reset attack, also known as a forged TCP reset or spoofed TCP reset, is a way to terminate a TCP connection by sending a forged TCP reset packet. This tampering technique can be used by a firewall or abused by a malicious attacker to interrupt Internet connections.