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sps
Asked: 2015-10-26 19:14:30 +0800 CST

how to see which port

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We know that when we connect to a http server then port 80 is used in server and a random port number in the client (web server).

I have three tabs opened in firefox. I have opened google, amazon, and gmail in each of those tabs respectively.

How can I see what port number is each of the http connection using. I am assuming those three tabs in firefox have three different http connection.

I am using firefox in ubuntu 14.04.

networking

2 Answers

  1. The command "netstat -tp" without quotes will give you all of your current connection status information such as local/foreign address and ports, protocol, etc. If you expand your command terminal to the left/right to widen it out, the last column shows you the local program (and its PID) responsible for the connection.

    Screenshot of me running the command

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  2. The command lsof -i :80 will show all active connections on port 80

    enter image description here

    it looks good when you use the watch command 

    watch -n 0 lsof -i :80

    enter image description here

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