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