Mailinglist Archive: opensuse (1632 mails)

["Carlos E. R." <robin.listas@xxxxxxxxxxxxxx>]

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The Sunday 2007-07-15 at 11:52 +0200, Theo v. Werkhoven wrote:

> > Wrong.
> > 
> > Ipv6 addresses can be written in several different formats. The "::ffff" 
> > part is equivalent to :0:0:0:0:ffff.
> 
> Right. But there is no valid (public) address range in IPv6 that starts with
> ::ffff , so this address can never be resolved by an Internet DNS.
> 
> >   cer@nimrodel:~> host ::ffff:195.135.221.135
> >   Host 7.8.d.d.7.8.3.c.f.f.f.f.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa not found: 3(NXDOMAIN)
> > 
> > 
> > See? The host command knows how to read and interpret it, so it is 
> > standard notation.
> 
> You were right there, but not by trying to reverse resolve it,
> that's just wrong.

It is an IPv4 address converted to IPv6, so it must be resolvable. In 
fact, you can see in the header that they resolved it:

] Received-SPF: none (Address does not pass the Sender Policy Framework)
]  SPF=HELO; sender=lists4.suse.de; remoteip=::ffff:195.135.221.135;
                                    ^^^^^^^^
]  remotehost=lists4.suse.de; helo=lists4.suse.de; 
   ^^^^^^^^
] receiver=exa.billmerriam.com;

So, if they did, why can't I? That's the question.


- -- 
Cheers,
       Carlos E. R.
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