Mailinglist Archive: opensuse (888 mails)

["David C. Rankin" <drankinatty@xxxxxxxxxxxxxxxxxx>]

On 12/31/2010 02:55 AM, Per Jessen wrote:
> David C. Rankin wrote:
>
> > Guys,
> >
> > What is the proper entry for 127.0.0.1 in /etc/hosts? 
>
> My systems all have:
>
> 127.0.0.1 localhost
>
> > I have seen discussion that 127.0.0.2 is deprecated 
>
> Like John says, 127.0.0.0/8 are usually assigned to the loopback
> interface, and are usually = localhost. 

Well,

        The documentation shows (man hosts):

IP_address canonical_hostname [aliases...]

showing you can have any number of aliases for a given IP_address
canonical_hostname pair. So I have always included the hostname as an alias
after localhost:

127.0.0.1       localhost phoenix

which provides resolution for localhost as well as your hostname on loopback. I
have run across several web apps that want to be able to resolve the loopback
address with the hostname. The 127.0.0.2 SuSE has used is a hack and there is
talk about doing away with it completely.

The real problem is with dnsdomainname (or hostname -d) which will not resolve
to anything unless you include the full canonical_hostname in /etc/hosts:

127.0.0.1           providence.rlfpllc.com      localhost providence

This works fine for dnsdomainname (or hostname -d). Also, since it provides the
definition for localhost on loopback, it does what it is supposed to as far as I
can tell. I can't see any downside to this approach, but I'm skeptical enough to
ask and see if anybody else knows of any gotchas or side-effects from doing 
this?



-- 
David C. Rankin, J.D.,P.E.
Rankin Law Firm, PLLC
510 Ochiltree Street
Nacogdoches, Texas 75961
Telephone: (936) 715-9333
Facsimile: (936) 715-9339
www.rankinlawfirm.com
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