In message <[email protected]>, Stephane Bortzmeyer writes:
> On Wed, Mar 04, 2009 at 11:55:39AM -0500,
> Andrew Sullivan <[email protected]> wrote
> a message of 22 lines which said:
>
> > There's a strong technical reason to ban any numeric TLD name that
> > could be interpreted as part of a dotted-quad,
>
> They cannot be "interpreted as part of a dotted-quad" if everyone
> follows RFC 1123 section 2.1 "The host SHOULD check the string
> syntactically for a dotted-decimal number before looking it up in the
> Domain Name System".
If I put this record into the DNS "1.2.3.4. A 4.3.2.1"
and email to [email protected]. Where does the email go?
Next I telnet to 1.2.3.4 port 25. Where does that connection
go?
If 1.2.3.4 is a legal hostname / mail domain then the first will
go to 4.3.2.1 port 25 and the second to 1.2.3.4 port 25.
To send email to a IP address I need to use "u...@[1.2.3.4]".
The MTA knows 1.2.3.4 is a hostname not a IP address.
Put 1.2.3.4 into the rdata of a MX/SRV record. Similar
problem at the client knows these are name and not addresses.
Mark
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--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: [email protected]
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