port

[kaushik016]

is there any command to check whether internet connection is available at a certain port or not??

[GreenSkyChris]

is there any command to check whether internet connection is available at a certain port or not??

What are you trying to achieve?

You could try using "nmap" . First you need to install it by typing either "yum install nmap" or "apt-get install nmap" depending if you are running red hat based or debian based distro.

Then type " nmap -v -sT 127.0.0.1" where 127.0.0.1 is an ip address of your choice. My output is as below.

Starting Nmap 5.00 ( http://nmap.org ) at 2011-02-01 14:33 GMT
NSE: Loaded 0 scripts for scanning.
Initiating Connect Scan at 14:33
Scanning localhost (127.0.0.1) [1000 ports]
Discovered open port 80/tcp on 127.0.0.1
Discovered open port 631/tcp on 127.0.0.1
Completed Connect Scan at 14:33, 0.07s elapsed (1000 total ports)
Host localhost (127.0.0.1) is up (0.00066s latency).
Interesting ports on localhost (127.0.0.1):
Not shown: 998 closed ports
PORT    STATE SERVICE
80/tcp  open  http
631/tcp open  ipp

Read data files from: /usr/share/nmap
Nmap done: 1 IP address (1 host up) scanned in 0.30 seconds
           Raw packets sent: 0 (0B) | Rcvd: 0 (0B)