扫描
sudo nmap 192.168.211.137 -p- -sS -sV -Pn
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 8.2p1 Ubuntu 4ubuntu0.1 (Ubuntu Linux; protocol 2.0)
25/tcp open smtp Postfix smtpd
80/tcp open http Apache httpd 2.4.41 ((Ubuntu))
110/tcp open pop3 Dovecot pop3d
143/tcp open imap Dovecot imapd (Ubuntu)
993/tcp open ssl/imap Dovecot imapd (Ubuntu)
995/tcp open ssl/pop3 Dovecot pop3