是否可以检查ubuntu服务器上的远程系统的端口是否打开？
我应该能够检查我的机器上的端口(例如：ssh)是否为远程机器打开.
使用好旧的telnet：
原文链接：https://www.f2er.com/ubuntu/349082.html[user@lappie ~]$telnet host 22 Trying ip.adr.tld ... Connected to host (ip.addr.tld). Escape character is '^]'. SSH-2.0-OpenSSH_5.1p1 Debian-5
这是一次成功的尝试.不成功的应该是这样的;
[user@lappie ~]$telnet host 23 Trying ip.adr.tld ... telnet: connect to address ip.adr.tld: Connection refused telnet: Unable to connect to remote host: Connection refused
或者使用nmap
[user@lappie ~]$nmap host Starting Nmap 5.21 ( http://nmap.org ) at 2010-10-07 11:25 CEST Nmap scan report for host (ip.adr.tld) Host is up (0.0052s latency). rDNS record for ip.adr.tld : host.domain.tld Not shown: 995 closed ports PORT STATE SERVICE 22/tcp open ssh 80/tcp open http 111/tcp open rpcbind 3000/tcp open ppp 5666/tcp open nrpe Nmap done: 1 IP address (1 host up) scanned in 0.18 seconds
