[ILUG] [OT] - One for the IPv6 guys

[Chris Higgins]

On Fri, 13 Oct 2006 11:11:18 +0000
Conor Daly <conor.daly_ilug at cod.homelinux.org> wrote:

> On Fri, Oct 13, 2006 at 10:52:37AM +0100 or so it is rumoured
> hereabouts,  paul at clubi.ie thought:
> > On Fri, 13 Oct 2006, Dave Rynne wrote:
> > 
> > >Also - you can replace the trailing '0:0:0:0:0' with '::'
> > 
> > You may replace any series of zero quads in an IPv6 address with ::,
> > 
> > once.
> 
> _Any_ series or only a _trailing_ series?  eg. can:
> 
> 2002:7ef2:1:0:0:0:0:1
> 
> be replaced with:
> 
> 2002:7ef2:1::1
> 
> assuming such an address is valid in the first place?

Any *SINGLE* series of 0:0:0 can be replaced with ::

So 2002:0:0:1:0:0:0:1
can become

2002::1:0:0:0:1

or

2002:0:0:1::1

but not

2002::1::1

Otherwise you can't reverse the shrinking in a predictable manner...

Is it 
2002:0:1:0:0:0:0:1 or 2002:0:0:0:1:0:1 etc..

> 
> Conor
> 
> -- 
> Conor Daly <conor.daly at cod.homelinux.org>
> -----BEGIN GEEK CODE BLOCK-----
> Version: 3.1
> GCS/G/S/O d+(-) s:+ a+ C++(+) UL++++ US++ P>++ L+++>++++ E--- W++ !N
> PS+ PE Y+ PGP? tv(-) b+++(+) G e+++(*) h-- r+++ z++++ 
> ------END GEEK CODE BLOCK------
> http://www.geekcode.com/ http://www.ebb.org/ungeek/
> -- 
> Irish Linux Users' Group mailing list
> About this list : http://mail.linux.ie/mailman/listinfo/ilug
> Who we are : http://www.linux.ie/
> Where we are : http://www.linux.ie/map/


-- 
Chris Higgins
Darach Technology Ltd                      tel: +353-1-6204370
email: chris.higgins at darach.ie          fax: +353-1-6204371
http://www.darach.ie