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[Thiago Macieira]

On Thursday 04 December 2008 09:54:08 James Richard Tyrer wrote:
> Stefanos Harhalakis wrote:
> > On Wednesday 03 December 2008, Richard Moore wrote:
> >> On Mon, Dec 1, 2008 at 12:12 PM, James Richard Tyrer <tyrerj at acm.org> 
wrote:
> >>> That is the loop back IP address.  IIUC, the IP address for your system
> >>> is defined as 127.0.0.0.  I don't know if you can use an IP address
> >>> there.  It says Host/Domain. but the IP address might be acceptable.
> >>
> >> Anything within the 127.0.0.0/24 network is a valid localhost address.
> >> I have seen some distros using 127.0.0.2 for some reason for example.
> >> 127.0.0.0 itself is the address of the loopback network, so while it
> >> might work for somethings, it probably wouldn't work for everything.
> >
> > Minor correction: The whole 127.0.0.0/8 network is reserved for
> > loopback(s). See: http://www.rfc-editor.org/rfc/rfc3330.txt
>
> Gee, I hate to get picky, but:
>
> "This is ordinarily implemented using only 127.0.0.1/32 for loopback"
>
> So, 127.0.0.0 normally is the IP address for localhost and 127.0.0.1 is
> a loopback address.  I am not an expert, only that that is what I read
> in a Linux manual.

$ /sbin/ip route | grep ' lo '
127.0.0.0/8 dev lo  scope link

The whole 127.0.0.0/8 network is reserved for loopback. Many programs also 
rely on the fact that 127.x.y.z will loop back and can be used (for example, 
NTP).

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Software Engineer - Nokia, Qt Software
  Qt Software is hiring - ask me
      PGP/GPG: 0x6EF45358; fingerprint:
      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358
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