] From: Lanlan Pan <abby...@gmail.com> ] Give the choice to operators, time is the best witness, like IP surpassed ] ATM.
That is backwards. IP did not surpass ATM, because IP came long before ATM. Instead, end-to-end ATM was the last gasp of the end-to-end circuit switching point of view. End-to-end ATM was supposed to replace IP, but instead the new virtual circuits of ATM came far too late and did not solve the problems that packet switching had already solved. ATM has not yet died and is still common for some uses. For example, ATM is used as x.25 was used under IP in the early days of IP; many DSL installations use AMT VCs. A better and more relevant history is that of the SPF RR. The SPF RR was supposed to replace the use of the TXT rtype for SPF. The SPF RR was widely available in deployed DNS authoritative servers (via BIND). I think it was in milter modules for sendmail and postfix. Nevertheless, it died because it came late, was only a modest improvement, and required operators to do something more than they were doing. Vernon Schryver v...@rhyolite.com _______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
