1.使用nmap檢測開放埠，可檢測遠端伺服器[root@localhost ~]# nmap localhost
starting nmap 6.40 ( ) at 2020-06-09 01:40 cst
nmap scan report for localhost (127.0.0.1)
host is up (0.000023s latency).
other addresses for localhost (not scanned): 127.0.0.1
not shown: 998 closed ports
port state service
22/tcp open ssh
25/tcp open smtp
nmap done: 1 ip address (1 host up) scanned in 2.01 seconds
2.使用netstat檢測本地埠
[root@localhost ~]# netstat -tunlp
active internet connections (only servers)
proto recv-q send-q local address foreign address state pid/program name
tcp 0 0 0.0.0.0:22 0.0.0.0:* listen 6741/sshd
tcp 0 0 127.0.0.1:25 0.0.0.0:* listen 7053/master
tcp6 0 0 :::22 :::* listen 6741/sshd
tcp6 0 0 ::1:25 :::* listen 7053/master
udp 0 0 0.0.0.0:68 0.0.0.0:*
3.使用lsof檢測開放埠
[root@localhost ~]# lsof -i:22
command pid user fd type device size/off node name
sshd 6741 root 3u ipv4 37912 0t0 tcp *:ssh (listen)
sshd 6741 root 4u ipv6 37914 0t0 tcp *:ssh (listen)
sshd 17129 root 3u ipv4 48317 0t0 tcp localhost.localdomain:ssh->192.168.100.1:65379 (established)
4.使用netcat檢測埠
[root@localhost ~]# nc -zv localhost 22
ncat: version 7.50 ( )
ncat: connected to ::1:22.
ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.
5.使用telnet檢測埠，只能檢測tcp埠。telnet+ip/網域名稱+埠
[root@localhost ~]# telnet localhost 22
trying ::1...
connected to localhost.
escape character is '^]'.
ssh-2.0-openssh_7.4
6.curl檢測埠，curl +ip:埠
[root@localhost ~]# curl localhost:22
ssh-2.0-openssh_7.4
protocol mismatch.
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