%include "default.mgp" %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %page %nodefault %size 7, font "standard", fore "white", center Issues in SMTP over IPv4/v6 %size 4 Kazuhiko Yamamoto WIDE Project v6@wide.ad.jp %font "typewriter" http://www.v6.wide.ad.jp/ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %page Toward SMTP over IPv4/v6 IPv4/v6 MTAs -- patches are ready IPv4/v6 MUAs -- almost okay (pop6) Impact of %cont, font "typewriter" "IN AAAA" %cont, font "standard" record on DNS database, to legacy MTAs/DNS servers %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %page Experiment Asked to send test emails toward the following address, to public %size 3 To: test@a.v6.wide.ad.jp To: test@b.v6.wide.ad.jp %font "typewriter", size 3 a.v6.wide.ad.jp. IN A 203.178.137.73 a.v6.wide.ad.jp. IN AAAA 3ffe:0501:1000::1 b.v6.wide.ad.jp. IN MX 10 c.v6.wide.ad.jp. b.v6.wide.ad.jp. IN MX 20 a.v4.wide.ad.jp. c.v6.wide.ad.jp. IN AAAA 3ffe:0501:1000::1 c.v4.wide.ad.jp. IN A 203.178.137.73 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %page Results 1380 emails sent from 1256 subdomains 33 emails are with invalid From: field 2 "MX loopback to myself" error (due to senders' misconfiguration?) 1 "no route to host" error (due to old named - 4.8.3) Old softwares are not happy with AAAA Sendmail before x.x.x bind before x.x.x %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %page What should we do now Let people know the problem Senders must update their software Informational document -> to be done For safety, use "v6" prefix in domain name for experiment v6.wide.ad.jp