Theo v. Werkhoven wrote:
Sun, 15 Jul 2007, by robin.listas@telefonica.net:
The Sunday 2007-07-15 at 01:24 +0200, Theo v. Werkhoven wrote:
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;
I noticed the ipv6 address, and I was curious to check who it was:
That is not an IPv6 address. IPv6 addresses are written with hex notation, e.g. 2001:888:10:90f::2 i.e. 8193.2184.16.2319.0.0.0.2 when written in decimal. What the meaning is of the '::ffff:' part I don't know, but it has nothing to do with IPv6 afaik. So your analysis has no meaning.
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.
Actually there is, it's called an IPv4 mapped address.
From the IBM TCP/IP Tutorial and Technical Overview redbook"
"IPv4-mapped address (::FFFF: