How do i use nmap to scan ports other than the default syn method?
saolasosme last edited by
-sT (TCP connect scan) . TCP connect scan is the default TCP scan type when SYN scan is not an option. This is the case when a user does not have raw packet privileges. Instead of writing raw packets as most other scan types do, Nmap asks the underlying operating system to establish a connection with the target machine and port by issuing the connect system call. This is the same high-level system call that web browsers, P2P clients, and most other network-enabled applications use to establish a connection. It is part of a programming interface known as the Berkeley Sockets API. Rather than read raw packet responses off the wire, Nmap uses this API to obtain status information on each connection attempt.
$ nmap -sT localhost
-sV (Version detection) . Enables version detection, as discussed above. Alternatively, you can use -A, which enables version detection among other things. -sR. is an alias for -sV. Prior to March 2011, it was used to active the RPC grinder separately from version detection, but now these options are always combined.
$ nmap -sV localhost
By version detection, it is the versions of the protocols.
PORT STATE SERVICE VERSION 22/tcp open ssh OpenSSH 7.4 (protocol 2.0) 25/tcp open smtp Postfix smtpd 111/tcp open rpcbind 2-4 (RPC #100000) 631/tcp open ipp CUPS 1.6 Service Info: Host: centos-linux.shared
You can perform more aggressive version detection by using the option --version-intensity level.
$ nmap -sV --version-intensity 5 localhost
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