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--></style></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:12.0pt'>Apologies for not answering sooner, travelling last week and then out of the office on Friday. I saw the post earlier, just couldn't respond.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>We've been tracking this issue. The measurements we relied upon were done some time ago, as Jaap mentions via Geoff Huston's work.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>What we have been doing in addition includes - tracking the existing deployment of large-ish key sets across Top Level Domains. (I.e., there's already operational experience with the situation.) <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>One of the tests done is described at the URL coming up. (It's not as extensive as a fleet of RIPE anchors though.)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>https://www.youtube.com/watch?v=sc2J5w4Zi2g&list=PLQziMT9GXafWAdedvzQYmqvW3N7SEo5_e&index=5<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>We've also been recommending, via talks at operator venues, to run TCP and have also presented DNS-OARC's and Verisign's response size tests.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>See slide 27 of https://ripe74.ripe.net/presentations/25-RIPE74-lewis-submission.pdf. BTW, slide 25, leading up to that, was inspired by Yoneya(-san) Yoshiro of JPRS.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><div><div><p class=MsoNormal style='margin-left:.5in'>On 8/2/17, 02:31, "<a href="mailto:ksk-rollover-bounces@icann.org">ksk-rollover-bounces@icann.org</a> on behalf of Davey Song(<span lang=ZH-CN style='font-family:"MS Mincho",serif'>宋林健</span>)" <<a href="mailto:ksk-rollover-bounces@icann.org">ksk-rollover-bounces@icann.org</a> on behalf of <a href="mailto:ljsong@biigroup.cn">ljsong@biigroup.cn</a>> wrote:<span style='font-size:11.0pt'><o:p></o:p></span></p></div></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><p class=MsoNormal style='margin-left:.5in'>Hi ICANN KSK rollover team, <o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> <o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'>For your information, I have an observation on large response impacts during Yeti KSK rollover. Please check the article.<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> <o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><a href="http://yeti-dns.org/yeti/blog/2017/08/02/large-packet-impact-during-yeti-ksk-rollover.html">http://yeti-dns.org/yeti/blog/2017/08/02/large-packet-impact-during-yeti-ksk-rollover.html</a> <o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> <o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'>Best regards,<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'>Davey<o:p></o:p></p></div></body></html>