Re: Re: IPv6 with 'a' or do we need 'aaaa' ?

On Thu, 2005-05-26 at 13:38 +0200, Frank Ellermann wrote:
> Jeroen Massar wrote:
<SNIP>
> > what about host.example.com/24 IPv4 or IPv6?
> It depends on the connection, either IPv4 or IPv6.  If you
> have both A and AAAA with different CIDRs you'd use the
> "dual-cidr-length" notation, e.g. a:host.example.com/24//48
>
> You almost always have //nn to identify an IPv6 CIDR, only
> for ip6: you'd use one slash /nn for an IPv6 CIDR, because
> then it's clear.
>
> Your original a:host.example.com/24 is in fact the same as
> a:host.example.com/24//128 (24 for A, default 128 for AAAA)
It is a really odd way to write it, but then it is at least defined.

Thus: "v=spf1 a:host.example.com// -all"

Means host.example.com/32 in IPv4 + host.example.com/128 in IPv6 is
allowed to send and not anything else?

The big remaining question then still is, what happens with the above
when host.example.com sends a mail outbound and the receiving end
doesn't have IPv6 SPF capabilities...

Greets,
 Jeroen

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