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GNU/Linux Command-Line Tools Summary

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   GNU/Linux Command-Line Tools Summary
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Chapter 13. Network Commands

The network commands chapter explains various tools which can be useful when networking with other computers both within the network and accross the internet, obtaining more information about other computers. This chapter also includes information on tools for network configuration, file transfer and working with remote machines.

  • netstat
  •    

    Displays contents of /proc/net files. It works with the Linux Network Subsystem, it will tell you what the status of ports are ie. open, closed, waiting, masquerade connections. It will also display various other things. It has many different options.


  • tcpdump
  •    

    This is a sniffer, a program that captures packets off a network interface and interprets them for you. It understands all basic internet protocols, and can be used to save entire packets for later inspection.


  • ping
  •    

    The ping command (named after the sound of an active sonar system) sends echo requests to the host you specify on the command line, and lists the responses received their round trip time.

    You simply use ping as:


       

 ping ip_or_host_name 

Note to stop ping (otherwise it goes forever) use CTRL -C (break).


       Please note
        

Using ping/smbmount/ssh or other UNIX system programs with a computer name rather than IP address will only work if you have the computer listed in your /etc/hosts file. Here is an example:


   

 192.168.1.100 new 

This line says that their is a computer called "new" with IP address 192.168.1.100. Now that it exists in the /etc/hosts file I don't have to type the IP address anymore, just the name "new".


  • hostname
  •    

    Tells the user the host name of the computer they are logged into. Note: may be called host.


  • traceroute
  •    

    traceroute will show the route of a packet. It attempts to list the series of hosts through which your packets travel on their way to a given destination. Also have a look at xtraceroute (one of several graphical equivalents of this program).

    Command syntax:


       

     traceroute machine_name_or_ip 


  • tracepath
  •    

    tracepath performs a very simlar function to traceroute the main difference is that tracepath doesn't take complicated options.

    Command syntax:


       

     tracepath machine_name_or_ip 


  • findsmb
  •    

    findsmb is used to list info about machines that respond to SMB name queries (for example windows based machines sharing their hard disk's).

    Command syntax:


       

     findsmb 

    This would find all machines possible, you may need to specify a particular subnet to query those machines only...


  • nmap
  •    

    " network exploration tool and security scanner". nmap is a very advanced network tool used to query machines (local or remote) as to whether they are up and what ports are open on these machines.

    A simple usage example:


       

     nmap machine_name 

    This would query your own machine as to what ports it keeps open. nmap is a very

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