<div dir="ltr">I'd caution against assuming that a significant spike in requests per second to affected Dyn servers was definitely part of the attack. As long as resolvers were receiving SERVFAILs and timeouts, they'll be generating an abnormally large amount of retries.<div><br></div><div>Andrew</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Oct 24, 2016 at 12:04 PM, Outages <span dir="ltr"><<a href="mailto:virendra.rode@outages.org" target="_blank">virendra.rode@outages.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div>See if this helps,</div><div id="m_-4225744770285174047AppleMailSignature"><br></div><div id="m_-4225744770285174047AppleMailSignature"><a href="https://labs.ripe.net/Members/massimo_candela/a-quick-look-at-the-attack-on-dyn" target="_blank">https://labs.ripe.net/Members/<wbr>massimo_candela/a-quick-look-<wbr>at-the-attack-on-dyn</a><br><br>--<div>regards,</div><div>/vrode </div></div><div><br>On Oct 22, 2016, at 6:48 PM, Charles Sprickman <<a href="mailto:spork@bway.net" target="_blank">spork@bway.net</a>> wrote:<br><br></div><blockquote type="cite"><div><span>I wanted to poke through our netflow data from Friday to see if any customers were involved.  Do we have any idea which Dyn IPs were being hit in the east coast attack?</span><br><span></span><br><span>I’ve been poking around with sorting by packet count to UDP 53, but I’m not even sure this was an application level or volumetric attack.   Nothing is standing out (yet)…</span><br><span></span><br><span>Thanks,</span><br><span></span><br><span>Charles</span><span class="HOEnZb"><font color="#888888"><br><span>-- </span><br><span>Charles Sprickman</span><br><span>NetEng/SysAdmin</span><br><span><a href="http://Bway.net" target="_blank">Bway.net</a> - New York's Best Internet <a href="http://www.bway.net" target="_blank">www.bway.net</a></span><br><span><a href="mailto:spork@bway.net" target="_blank">spork@bway.net</a> - <a href="tel:212.982.9800" value="+12129829800" target="_blank">212.982.9800</a></span><br><span></span><br><span></span><br><span></span><br><span>______________________________<wbr>_________________</span><br><span>Outages-discussion mailing list</span><br><span><a href="mailto:Outages-discussion@outages.org" target="_blank">Outages-discussion@outages.org</a></span><br><span><a href="https://puck.nether.net/mailman/listinfo/outages-discussion" target="_blank">https://puck.nether.net/<wbr>mailman/listinfo/outages-<wbr>discussion</a></span><br></font></span></div></blockquote></div><br>______________________________<wbr>_________________<br>
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