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Linux Journal: Your Network's Secret Life, Part 2

Jun 10, 2001, 13:29 (0 Talkback[s])
(Other stories by Marcel Gagné)

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A series on network monitoring at Linux Journal continues this week with a look at some less glamorous informational tools: ping and etherape.

One of the things I tried to do in the last column was show that we shouldn't forget the basic tools that come with our systems. Many of those great flashy programs use these tools somewhere beneath their shiny surfaces--why shouldn't we do the same? We'll get flashy soon enough; right now though, I would like to look at a couple of other, less glamorous, network monitoring tools, and show you some of the power they possess. Then we'll do some flash, I promise.

Okay, you all know about the ping command. The official purpose of ping is to send ICMP ECHO_REQUEST packets to remote hosts. The name comes from radar pings sent by submarines to detect other subs or ships underwater. In its most basic form, ping lets us know whether a remote host can be reached. If I wanted to see whether www.linuxjournal.com was up (other than doing it the smart way and using a browser), I might use the following command:

$ ping -c 4 www.linuxjournal.com

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