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Old 02-02-2008, 09:00 PM   #1
Registered: May 2007
Location: California
Distribution: Slackware/Ubuntu
Posts: 609

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What is loopback? And what is it for regarding networking?

I sort of understand it it the computer talking to itself.

When using client/server on the same computer such as hylafax. Are you using the loop back to talk to itself?

Or when connecting to the local host, http://localhost:631/, are you using the loop back?

Could someone please elaborate and explain in simple terms?
Old 02-02-2008, 09:14 PM   #2
Registered: Sep 2005
Location: Baltimore, MD, USA
Distribution: Fedora, Gentoo, Debian, Slackware, IRIX, OS X
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Loopback is a special network device that points to the system itself, and works with the IP address When you connect to localhost, that usually points to the loopback network device. Basically, it gives the computer a network device to talk to itself without the need for ethernet, wifi, token ring, etc.


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