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Re: 127.0.1.1 in /etc/hosts, why?

From: Derek Broughton <news(at)pointerstop.ca>
Date: Fri Aug 10 2007 - 09:15:07 EDT


Gerald Dachs wrote:

> Quoting Casey Stamper <casey.stamper@gmail.com>:
>

>> I will admit my ignorance as to why that entry is in there but I DO
>> know that if you add mycomputer.mydomain mycomputer to the first line
>> as well, your name resolution speed increases and DNS lookups are much
>> faster.

>
> Yes, I have read this too when I searched for a reason for this 127.0.1.1
> IP. This makes it even more questionable. Is this a bug?
> I have seen this only in Ubuntu and I have seen many Linux and Unix
> installations.

Is which a bug? If domain name resolution is really slowed, I'd think that's a bug. Using 127.0.1.1 is not a bug. It can be quite handy to use different IPs for different ways to name the local machine, and 127.* is always the local machine. I really don't see how using multiple 127 addresses should slow down my name resolution.

My /etc/hosts has:

$ cat /etc/hosts

127.0.0.1 localhost
127.0.1.1 othello.pointerstop.ca othello
127.0.0.2 unix
127.0.0.3 plonevdc

127.0.1.1 is my real host
127.0.0.2 is to work around a bug in NX (may not even still be present) that tried to use Unix sockets over TCP - so if you define "unix" as your current system, you can get a TCP socket to it. 127.0.0.3 ensures that a test HTTP server has a unique IP address.

Strictly, they could all be on 127.0.0.1, and the HTTP server can be identified as a virtual host by Apache, but I find this convenient and cost-free.

-- 
derek


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Received on Fri Aug 10 09:29:57 2007

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