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Re: IPv6 tracking assignments (OSS recommendations)

  • From: Crist Clark
  • Date: Thu Jan 03 18:57:04 2008

>>> Jeroen Massar <[email protected]> 1/2/2008 2:40 PM >>>
Deepak Jain wrote:
> > 
> >> I would think if you find something that tracks IPv6, that's all
> >> you need. You can represent the whole IPv4 space with IPv4-mapped
> >> IPv6 addresses, :ffff:a.b.c.d.
> >>
> > 
> > This is certainly true. Let's not forget that a simple thing that
> > the :ffff: and converts the remaining bits from hex to decimal (at
> > visually) would be needed to keep the clue impaired up and running.
> Any application which is visualizing IPv4 adresses using either
> ::ffff:x.x.x.x or ::x.x.x.x is wrong(tm). Those addresses should
> ever be shown to the user or used in any way as a textual
> (that includes for instance logfiles, XML files, and other such

I'll freely admit to only dabbling in IPv6 on my home network
and having done a very little bit of nosing around in the KAME
codebase, so I could you give some references for this stance.
Some RFCs or other docs delivered from the mount saying users
are never supposed to see these?

The fact that the RFCs specify special presentation formats
for these addresses kind of just made me assume that they were
meant for humans to see and use. But we all know assumptions
can be way off.

> If you find an application which does this, don't hesitate to kick
> coders to fix their stuff.

OK, so, is this,

  $ netstat -an | fgrep ::ffff:
  tcp        0     48 ::ffff:    
::ffff:   ESTABLISHED 
  $ uname -srvmo
  Linux 2.6.17-1.2142_FC4 #1 Tue Jul 11 22:41:14 EDT 2006 i686

On a plain ol' dual stack Linux box living on an IPv4-only network
kosher? Or does kicking need to be done?

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