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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.
>
> > [EMAIL PROTECTED]:~> 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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