On Mon, Jul 25, 2011 at 11:12:46AM +1000, Mark Andrews wrote: > > > But, do current webbrosers resolve names using anything but DNS A? > > > (well, I know that they use /etc/hosts). Anyhow, WINS / NIS /etc/hosts > > > and such stuff just maps a hostname into a single IP. It's the > > > equivalent of a DNS A resource record. Think about locating a mail > > > server (MX is required), you need a DNS server. > > > > ... or a static entry (the "Smart Relay host" entry you see in on the DS > > line in sendmail.cf). That's the case of any mail client in a campus, they > > don't use DNS to send outgoing mail. And even within the mail relays and > > servers, it's quite common to have a relaydomains file to map domains to > > servers. > > > > Willy > > But the Smart Relay host uses MX records. The Smart Relay host should > be seen as the same as a HTTP proxy. Exactly, which means that the browser can't be required to rely on any information from the DNS since it does not necessarily have access to it and other components which are not under our control might behave in a different manner than what we'd like. Regards, Willy _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf