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Howto verify linux open port

This is a discussion on Howto verify linux open port within the Getting started tutorials forums, part of the Linux Getting Started category; Simply use following command: Code: netstat -tulp OR Code: netstat -tulpn Sampleoutput: Code: Proto Recv-Q Send-Q Local Address Foreign Address ...

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Howto verify linux open port

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05-18-2007, 01:49 AM

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Howto verify linux open port

Simply use following command:

Code:

netstat -tulp

Code:

netstat -tulpn

Sampleoutput:

Code:

Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name   
tcp        0      0 *:ssh                       *:*                         LISTEN      3224/sshd           
tcp        0      0 *:10000                     *:*                         LISTEN      30042/(squid)       
tcp        0      0 localhost:smtp              *:*                         LISTEN      3836/master         
udp        0      0 *:56315                     *:*                                     30042/(squid)       
udp        0      0 *:icpv2                     *:*                                     30042/(squid)

Look out for 4th column Local Address it shows open ports ssh (22) ,smtp(25) and others. For more info see:
Linux: Scanning network for open ports | nixCraft
How do I find out what ports are listening/open on my Linux/FreeBSD server? | Frequently Asked Questions

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Howto verify linux open port

Howto verify linux open port

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