In message <20090306095645.ga19...@nic.fr>, Stephane Bortzmeyer writes: > On Wed, Mar 04, 2009 at 11:55:39AM -0500, > Andrew Sullivan <a...@shinkuro.com> 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 u...@1.2.3.4. 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 > _______________________________________________ > DNSOP mailing list > DNSOP@ietf.org > https://www.ietf.org/mailman/listinfo/dnsop -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: mark_andr...@isc.org _______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop