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<p class="MsoNormal">Mark, colleagues,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">A quick update regarding the state of the nameservers in the
gTLD space, I have been monitoring the nameservers of the gTLDs, and across
time between 99.9% and 100% nameservers do not present any of the EDNS issues
described in https://tools.ietf.org/html/draft-ietf-dnsop-no-response-issue-04.
Registries have solved the issues reported by ICANN in a timely manner.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Finally, a handful of name servers are copying the Z flag bit from the query header (see 8.1.3.3 of draft-ietf-dnsop-no-response-issue-04) and
this is related to a bug that has now been fixed now in Knot (see. https://gitlab.labs.nic.cz/labs/knot/issues/476). We expect that in the near future the MBZ
issue should be solved in the gTLD space as Registries roll out the new version.<o:p></o:p></p><p class="MsoNormal"><br></p><p class="MsoNormal">Regards,</p><p class="MsoNormal">Gustavo</p>
<!--EndFragment--></div><div><br></div></div><div><br></div><div>On 7/26/16, 15:59, "Gustavo Lozano" <<a href="mailto:gustavo.lozano@icann.org">gustavo.lozano@icann.org</a>> wrote:</div><div><br></div><blockquote id="MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style="BORDER-LEFT: #b5c4df 5 solid; PADDING:0 0 0 5; MARGIN:0 0 0 5;"><div>Thank you Mark,</div><div><br></div><div>In the past we worked with a few gTLD backends to solve these issues. I</div><div>think that the massive improvement that you mentioned is related to this</div><div>effort. I will review your latest report and work with the affected gTLD</div><div>backends to solve any new issue.</div><div><br></div><div>Regards,</div><div><br></div><div>Gustavo Lozano</div><div>ICANN</div><div><br></div><div>On 7/25/16, 21:01, "<a href="mailto:gtld-tech-bounces@icann.org">gtld-tech-bounces@icann.org</a> on behalf of Mark Andrews"</div><div><<a href="mailto:gtld-tech-bounces@icann.org">gtld-tech-bounces@icann.org</a> on behalf of <a href="mailto:marka@isc.org">marka@isc.org</a>> wrote:</div><div><br></div><blockquote id="MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style="BORDER-LEFT: #b5c4df 5 solid; PADDING:0 0 0 5; MARGIN:0 0 0 5;"><div><br></div><div>In message <<a href="mailto:0EDF3BC2-6E1E-4A2B-B264-3972B5E994B2@icann.org">0EDF3BC2-6E1E-4A2B-B264-3972B5E994B2@icann.org</a>>, Francisco</div><div>Arias writes:</div><blockquote id="MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style="BORDER-LEFT: #b5c4df 5 solid; PADDING:0 0 0 5; MARGIN:0 0 0 5;"><div> Hi Mark,</div><div><br></div><div> Are you suggesting there is an issue with TLD servers or second-level</div><div> names, or both?</div></blockquote><div><br></div><div>There are issues with both though the TLD servers have show a massive</div><div>improvement [1] and the GTLD subset are supposed to be RFC compliant</div><div>with DNSSEC, EDNS(0) and STD 13 as per their contracts. The root</div><div>servers also need to meet the same level of compliance.</div><div><br></div><div>[2] shows that most of the TLD and root servers are basically</div><div>compliant. The tests used are described in [3].</div><div><br></div><div>The second level names are a entirely different matter with only</div><div>~60% [1] of servers actually passing just the EDNS(0) subset of the</div><div>tests above.</div><div><br></div><div>Everytime new features (EDNS, DNSSEC, DNS COOKIES, AD=1 in queries)</div><div>have been deployed in the DNS resolver vendors have had to work</div><div>around non compliant servers where possible or just live with the</div><div>fact that you can't do reliable signaling because the broken servers</div><div>were not removed from the ecosystem in a timely enough manner (AD</div><div>is echoed back by too many servers despite this being explicting</div><div>prohibited by STD13). This could have been avoided if nameservers</div><div>were actually checked for protocol compliance and operators with</div><div>non-compliant servers informed that their servers are broken.</div><div><br></div><div>Some of this will improve as operators use F1 [4] load balancers</div><div>and Checkpoint Firewalls upgrade (Unknown EDNS version and Unknown</div><div>EDNS Flags will no longer cause the DNS message to be dropped based</div><div>on correspondence with a Checkpoint developer.) This won't cover</div><div>all cases of packets being dropped. Nor will it address the servers</div><div>returning inappropriate responses.</div><div><br></div><div>To be able to use the extensions mechanisms specified in EDNS(0)</div><div>the deployed server need to be well behaved when they see a message</div><div>using a extensions mechanisms. This is very much not the case</div><div>today.</div><div><br></div><div>Mark</div><div><br></div><div>[1] <a href="https://ednscomp.isc.org/compliance/summary.html">https://ednscomp.isc.org/compliance/summary.html</a></div><div>[2] <a href="https://ednscomp.isc.org/compliance/tld-fullreport.txt">https://ednscomp.isc.org/compliance/tld-fullreport.txt</a></div><div>[3] <a href="https://tools.ietf.org/html/draft-ietf-dnsop-no-response-issue-03">https://tools.ietf.org/html/draft-ietf-dnsop-no-response-issue-03</a>.</div><div>[4] </div><div><a href="https://support.f5.com/kb/en-us/solutions/public/16000/200/sol16240.html">https://support.f5.com/kb/en-us/solutions/public/16000/200/sol16240.html</a></div><div><br></div><div>Mark</div><div><br></div><blockquote id="MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style="BORDER-LEFT: #b5c4df 5 solid; PADDING:0 0 0 5; MARGIN:0 0 0 5;"><div> Regards,</div><div><br></div><div> --</div><div> Francisco</div><div> On 7/18/16, 2:07 PM, "<a href="mailto:gtld-tech-bounces@icann.org">gtld-tech-bounces@icann.org</a> on behalf of Mark</div><div> Andrews" <<a href="mailto:gtld-tech-bounces@icann.org">gtld-tech-bounces@icann.org</a> on behalf of <a href="mailto:marka@isc.org">marka@isc.org</a>> wrote:</div><div><br></div><div><br></div><div> As part of preparations for shipping nameservers that support DNS</div><div> COOKIES (RFC 7873) I have been measuring EDNS Compliance in a number</div><div> data sets the results of which are available at</div><div> <a href="https://ednscomp.isc.org">https://ednscomp.isc.org</a></div><div> along with a online tester. We wanted how much will break when we</div><div> ship BIND 9.11.0 which has DNS COOKIES on by default.</div><div><br></div><div> We found there were zones that could no longer resolve if validation</div><div> was enabled. Named falls back to plain DNS on certain detected</div><div> errors as there isn't time to probe exact failure causes by trial</div><div> and error. Even if trial and error worked for DNS COOKIEs the</div><div> problem will get worse as more EDNS features get used.</div><div><br></div><div> We found zones that were taking multiple seconds to resolve. We</div><div> were back to the sort of resolution times we saw when EDNS was first</div><div> introduced for some zones.</div><div><br></div><div> We saw increased queries being needed to be made as servers didn't</div><div> correctly ignore unknown EDNS options.</div><div><br></div><div> All these errors are easily determinable by running a handful of</div><div> queries against each server.</div><div><br></div><div> RFC 1034 and RFC 1035 were written assuming that servers delegated</div><div> to would be RFC compliant. Currently GTLD servers are checked and</div><div> there is no reason that servers delegated to by the GTLD servers</div><div> can't also be checked and the operators asked to fix the faults</div><div> detected. This can be done at both the RFC 1034 and RFC 1035 level</div><div> and at the EDNS level. It is not a actionable condition if all the</div><div> EDNS tests fail in a way that indicated the EDNS is not supported.</div><div><br></div><div> I would suggest that {E}DNS compliance checking be done within a</div><div> week of a new server being registered and delegated to and 1/2</div><div> yearly thereafter. If a server fails a test that the operator /</div><div> registrant be informed and the server be retested in a month. I</div><div> would also suggest that compliance testing results and test date</div><div> should be record in whois or similar so there is no need to retest</div><div> too frequently.</div><div><br></div><div> Mark</div><div> --</div><div> Mark Andrews, ISC</div><div> 1 Seymour St., Dundas Valley, NSW 2117, Australia</div><div> PHONE:<span class="Apple-tab-span" style="white-space:pre"> </span>+61 2 9871 4742<span class="Apple-tab-span" style="white-space:pre"> </span><span class="Apple-tab-span" style="white-space:pre"> </span> INTERNET: <a href="mailto:marka@isc.org">marka@isc.org</a></div><div><br></div><div><br></div></blockquote><div><br></div><div>-- </div><div>Mark Andrews, ISC</div><div>1 Seymour St., Dundas Valley, NSW 2117, Australia</div><div>PHONE: +61 2 9871 4742 INTERNET: <a href="mailto:marka@isc.org">marka@isc.org</a></div></blockquote><div><br></div></blockquote></body></html>