如何检查Linux中的开放端口列表？

虽然 Nmap 通常用于安全审计，但许多系统和网络管理员发现它对于日常工作也非常有用，例如网络资产清点、管理服务升级计划以及监控主机或服务正常运行时间。

# nmap -sTU -O localhost
 
Starting Nmap 6.40 ( http://nmap.org ) at 2019-03-20 09:57 CDT
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00028s latency).
Other addresses for localhost (not scanned): 127.0.0.1
Not shown: 1994 closed ports
 
PORT    STATE SERVICE
22/tcp  open  ssh
25/tcp  open  smtp
80/tcp  open  http
199/tcp open  smux
123/udp open  ntp
161/udp open  snmp
 
Device type: general purpose
Running: Linux 3.X
OS CPE: cpe:/o:linux:linux_kernel:3
OS details: Linux 3.7 - 3.9
Network Distance: 0 hops
 
OS detection performed. Please report any incorrect results at http://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 1.93 seconds

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