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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. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (GNU/Linux) Comment: Made with pgp4pine 1.76 iD8DBQFGmgzrtTMYHG2NR9URAn1nAJ4heuLH4eytvz7sdpv8G/XlVRXGVgCfeNt/ blhN8DuV5+/R49AnHpNSH0g= =1EFP -----END PGP SIGNATURE----- -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]