08-17-2015
127.0.0.1 vs 0.0.0.0
Which one should I use in '/etc/hosts'?
Please explain in details.
Random quotes on the topic:
Quote:
When you use the 0.0.0.0 method it doesnt try connect anywhere. But if you use 127.0.0.1 it actually tries to connect to a service on your computer which makes it take longer and use up more resources. Also you might run a webserver that it ask for invalid requests. Therefore it is better to use 0.0.0.0 than 127.0.0.1 as you want to kill the connection not to loop it back to your computer
Quote:
Why is it better? 0.0.0.0 doesn't connect anywhere. 127.0.0.1 does. If I run a web server that has a virtual host with the same domain name, it would serve the request.
Quote:
What does that have to do with 0.0.0.0? 0.0.0.0 has NO meaning on Linux, FreeBSD, or Mac OS-X and causes problems on those operating systems. The added benefit of using 127.0.0.1 is that the top phttpd (Pseudo HTTP Daemon) and Homer log what is being stopped and why.
Quote:
I have tested both ways in Windows XP and Windows Server 2003 only, and all I can tell so far is that using a template in this form:
127.0.0.1 google-analytics.com
127.0.0.1 ssl.google-analytics.com
is not good at all for my system, and it can slow down even the most common operations.
But I have found that using a template in this form:
0.0.0.0 google-analytics.com
0.0.0.0 ssl.google-analytics.com
seems to be ok as far as system stability is concerned, and even the webpages are loading faster.
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LEARN ABOUT MINIX
ppmtopgm
ppmtopgm(1) General Commands Manual ppmtopgm(1)
NAME
ppmtopgm - convert a portable pixmap into a portable graymap
SYNOPSIS
ppmtopgm [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Produces a portable graymap as output. The output is a "black and white" rendering of the original
image, as in a black and white photograph. The quantization formula used is .299 r + .587 g + .114 b.
Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any ppm program can
read pgm (and pbm ) files automatically. pgmtoppm is for colorizing a pgm file. Also, see ppmtorgb3 for a different way of converting
color to gray. And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate the original
colors, not necessarily a way that looks like a black and white photograph.
QUOTE
Cold-hearted orb that rules the night
Removes the colors from our sight
Red is gray, and yellow white
But we decide which is right
And which is a quantization error.
SEE ALSO
pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)
AUTHOR
Copyright (C) 1989 by Jef Poskanzer.
10 April 2000 ppmtopgm(1)