william at elan
Nov 28, 2006, 11:28 AM
Views: 3073
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Re: New poll on the IP4 mapped IP6 connection controversy
[In reply to]
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On Tue, 28 Nov 2006, wayne wrote:
> What should happen when you get an SPF check using example.com and
> 72.81.252.18:
>
> example.com TXT "v=spf1 ip6:::FFFF:72.81.252.18 -all"
>
>
> 1) The SPF result is well defined and the result is Fail. An ip6:
> mechanism that lists an IPv4-mapped IPv6 address is effectively a
> no-op and will never be matched.
>
> 2) The SPF result is well defined and the result is Pass. All SPF
> implementations must check both ip4: and ip6: mechanisms.
>
> 3) The SPF result is well defined and it depends on whether the
> connecting SMTP session is on an IPv6 socket or an IPv4 socket. If
> it is on an IPv4 socket, the result is Fail, if it is on an IPv6
> socket, the result is Pass.
>
> 4) The SPF result is undefined and implementations can choose to match
> or not match this.
3 if you want to be that precise and actually mention it, otherwise 4
--
William Leibzon
Elan Networks
william [at] elan
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