<html><head></head><body><div style="color:#000; background-color:#fff; font-family:lucida console, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1540905454428_33968"><span>John,</span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1540905454428_34130"><span id="yui_3_16_0_ym19_1_1540905454428_34129">Thanks for the response. The article and video helped some. We are still looking into the issue. </span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1540905454428_34058"><span><br></span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1540905454428_34059"><span>Re: stub zones</span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1540905454428_34061"><span id="yui_3_16_0_ym19_1_1540905454428_34060">All our zones with exception of one is hosted in Route53. So would Unbound be hitting the recursory servers then?</span></div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: lucida console, sans-serif; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font size="2" face="Arial"> On Tuesday, October 30, 2018 9:56 AM, John Peacock <jpeacock@messagesystems.com> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv2093843448"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div class="yiv2093843448gmail_default">We've hit several un[der]documented limits when using AWS, see the first two entries here:</div><div class="yiv2093843448gmail_default"><br clear="none"> <a rel="nofollow" shape="rect" target="_blank" href="https://www.sparkpost.com/blog/?s=dns">https://www.sparkpost.com/blog/?s=dns</a></div><div class="yiv2093843448gmail_default"><br clear="none"></div><div class="yiv2093843448gmail_default">Our Principal Operations Engineer did a more technical presentation at several Usenix conferences:</div><div class="yiv2093843448gmail_default"><br clear="none"></div><div class="yiv2093843448gmail_default"> <a rel="nofollow" shape="rect" target="_blank" href="https://www.usenix.org/conference/srecon18americas/presentation/blosser">https://www.usenix.org/conference/srecon18americas/presentation/blosser</a></div><div class="yiv2093843448gmail_default"><br clear="none"></div><div class="yiv2093843448gmail_default">I don't know if any of that will help you; we are fully in the cloud and so our usage pattern is likely very different from yours (since you have an on-prem resolver).</div><div class="yiv2093843448gmail_default"><br clear="none"></div><div class="yiv2093843448gmail_default">I normally prefer stub zones over forward zones for this kind of configuration, since the AWS zones are authoritative and you don't need to use forward (which is implicitly a recursive query).</div><div class="yiv2093843448gmail_default"><br clear="none"></div><div class="yiv2093843448gmail_default">HTH</div><div class="yiv2093843448gmail_default"><br clear="none"></div><div class="yiv2093843448gmail_default">John</div><input type="hidden" name="virtru-metadata" value="{"></div></div><div class="yiv2093843448yqt7090773869" id="yiv2093843448yqt08997"><div class="yiv2093843448gmail_extra"><br clear="none"><div class="yiv2093843448gmail_quote" style="">On Tue, Oct 30, 2018 at 9:52 AM, Andrew Meyer via Unbound-users <span dir="ltr"><<a rel="nofollow" shape="rect" ymailto="mailto:unbound-users@nlnetlabs.nl" target="_blank" href="mailto:unbound-users@nlnetlabs.nl">unbound-users@nlnetlabs.nl</a>></span> wrote:<br clear="none"><blockquote class="yiv2093843448gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div><div style="color:#000;background-color:#fff;font-family:lucida console, sans-serif;font-size:16px;"><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6569">I have recently setup unbound on CentOS 7 (latest) running version 1.6.6. So far unbound has been chugging away for about a month. In my configuration I have an on premise server configured with lots of internal forwarded domains going to Amazon Route53. As of yesterday unbound started to flip/flop resolution from the internal/private zones to the external zones. I'm not sure why. I have turned up the logging verbosity to see if there was an apparent issue. I though at one point we hit a wall with number of packets per request. My colleague and I thought we hit a resource records maximum limit. We have opened a ticket with Amazon to get more information on their side. </div><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6569"><br clear="none"></div><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6569">In my config file:</div><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6569">num-threads: 4 </div><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6736">so-rcvbuf: 4m</div><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6737">so-sndbuf: 4m</div><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6779">cache-max-negative-ttl: 10</div><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6815">do-ip4: yes</div><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6819">do-ip6: yes</div><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6862">do-udp: yes</div><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6866">do-tcp: yes</div><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6866"><br clear="none"></div><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6866"><br clear="none"></div><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6866">Everything in my zones config file is a forward-zone and not a stub-zone, not sure if that matters.</div><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6866"><br clear="none"></div><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6866">Any help is greatly appreciated.</div><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6866"><br clear="none"></div><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6866">Regards,</div><div dir="ltr" id="yiv2093843448m_4005829941136748415yui_3_16_0_ym19_1_1540905454428_6866">Andrew</div></div></div></blockquote></div><br clear="none"></div></div></div></div></div><br><br></div> </div> </div> </div></div></body></html>