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A place to cache linked articles (think custom and personal wayback machine)
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larlet-fr-david-cache/cache/32c925bdf02776ae768591623d2.../index.html

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  1. <!doctype html><!-- This is a valid HTML5 document. -->

  2. <!-- Screen readers, SEO, extensions and so on. -->

  3. <html lang=fr>

  4. <!-- Has to be within the first 1024 bytes, hence before the <title>

  5.   See: https://www.w3.org/TR/2012/CR-html5-20121217/document-metadata.html#charset -->

  6. <meta charset=utf-8>

  7. <!-- Why no `X-UA-Compatible` meta: https://stackoverflow.com/a/6771584 -->

  8. <!-- The viewport meta is quite crowded and we are responsible for that.

  9.   See: https://codepen.io/tigt/post/meta-viewport-for-2015 -->

  10. <meta name=viewport content="width=device-width,minimum-scale=1,initial-scale=1,shrink-to-fit=no">

  11. <!-- Required to make a valid HTML5 document. -->

  12. <title>A warm welcome to DNS (archive) — David Larlet</title>

  13. <!-- Generated from https://realfavicongenerator.net/ such a mess. -->

  14. <link rel="apple-touch-icon" sizes="180x180" href="/static/david/icons/apple-touch-icon.png">

  15. <link rel="icon" type="image/png" sizes="32x32" href="/static/david/icons/favicon-32x32.png">

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  19. <link rel="shortcut icon" href="/static/david/icons/favicon.ico">

  20. <meta name="apple-mobile-web-app-title" content="David Larlet">

  21. <meta name="application-name" content="David Larlet">

  22. <meta name="msapplication-TileColor" content="#da532c">

  23. <meta name="msapplication-config" content="/static/david/icons/browserconfig.xml">

  24. <meta name="theme-color" content="#f0f0ea">

  25. <!-- That good ol' feed, subscribe :p. -->

  26. <link rel=alternate type="application/atom+xml" title=Feed href="/david/log/">

  27. 

  28.   <meta name="robots" content="noindex, nofollow">

  29.   <meta content="origin-when-cross-origin" name="referrer">

  30.   <!-- Canonical URL for SEO purposes -->

  31.   <link rel="canonical" href="https://powerdns.org/hello-dns/">

  32. 

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  35. html, body, div, span,

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  55. article, aside, details, figcaption, figure,

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  58. blockquote, q { quotes: none; }

  59. blockquote:before, blockquote:after,

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  100.        url('/static/david/css/fonts/concourse_t3_regular-webfont-20190806.woff') format('woff');

  101.   font-weight: 300;

  102.   font-style: normal;

  103.   font-display: swap;

  104. }

  105. 

  106. 

  107. /* http://practice.typekit.com/lesson/caring-about-opentype-features/ */

  108. body {

  109.   /* http://www.cssfontstack.com/ Palatino 99% Win 86% Mac */

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  163.   h1 span {

  164.     position: absolute;

  165.     top: 1vh;

  166.     left: 20%;

  167.     line-height: 0;

  168.   }

  169.     h1 span a {

  170.       line-height: 1.7;

  171.       padding: 1rem 1.2rem .6rem 1.2rem;

  172.       border-radius: 0 0 6% 6%;

  173.       background: #2d7474;

  174.       font-size: 1.3rem;

  175.       color: white;

  176.       text-decoration: none;

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  178. h2 {

  179.   margin: 4rem 0 1rem;

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  181.   padding-top: 1vh;

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  183. h3 {

  184.   text-align: center;

  185.   margin: 3rem 0 .75em;

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  191.   background: #07486c;

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  193. }

  194. time {

  195.   display: bloc;

  196.   margin-left: 0 !important;

  197. }

  198. ul, ol {

  199.   margin: 2rem;

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  201. ul {

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  206.   text-decoration-thickness: 0.05em;

  207.   text-underline-offset: 0.09em;

  208. }

  209. article {

  210.   max-width: 50rem;

  211.   display: flex;

  212.   flex-direction: column;

  213.   margin: 2rem auto;

  214. }

  215.   article.single {

  216.     border-top: .2vh dotted #2d7474;

  217.     margin: -6rem auto 1rem auto;

  218.     background: #f0f0ea;

  219.     padding: 2rem;

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  221.   article p:last-child {

  222.     margin-bottom: 1rem;

  223.   }

  224. p {

  225.   padding: 0 .5rem;

  226.   margin-left: 3rem;

  227. }

  228.   p + p,

  229.   figure + p {

  230.     margin-top: 2rem;

  231.   }

  232. 

  233. blockquote {

  234.   background-color: #e3e1e1;

  235.   border-left: .5vw solid #2d7474;

  236.   display: flex;

  237.   flex-direction: column;

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  239.   padding: 1rem;

  240.   margin: 1.5rem;

  241. }

  242.   blockquote cite {

  243.     font-style: italic;

  244.   }

  245.   blockquote p {

  246.     margin-left: 0;

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  248. 

  249. figure {

  250.   border-top: .2vh solid #2d7474;

  251.   background-color: #e3e1e1;

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  255.   font-size: 1.5rem;

  256.   width: 100%;

  257. }

  258.   figure img {

  259.     max-width: 250px;

  260.     max-height: 250px;

  261.     border: .5vw solid #323a45;

  262.     padding: 1px;

  263.   }

  264. figcaption {

  265.   padding: 1rem;

  266.   line-height: 1.4;

  267. }

  268. aside {

  269.   display: flex;

  270.   flex-direction: column;

  271.   background-color: #e3e1e1;

  272.   padding: 1rem 0;

  273.   border-bottom: .2vh solid #07486c;

  274. }

  275.   aside p {

  276.     max-width: 50rem;

  277.     margin: 0 auto;

  278.   }

  279. 

  280. /* https://fvsch.com/code/css-locks/ */

  281. p, li, pre, code, kbd, samp, var, tt, time, details, figcaption {

  282.   font-size: 1rem;

  283.   line-height: calc( 1.5em + 0.2 * 1rem );

  284. }

  285. h1 {

  286.   font-size: 1.9rem;

  287.   line-height: calc( 1.2em + 0.2 * 1rem );

  288. }

  289. h2 {

  290.   font-size: 1.6rem;

  291.   line-height: calc( 1.3em + 0.2 * 1rem );

  292. }

  293. h3 {

  294.   font-size: 1.35rem;

  295.   line-height: calc( 1.4em + 0.2 * 1rem );

  296. }

  297. @media (min-width: 20em) {

  298.   /* The (100vw - 20rem) / (50 - 20) part

  299.      resolves to 0-1rem, depending on the

  300.      viewport width (between 20em and 50em). */

  301.   p, li, pre, code, kbd, samp, var, tt, time, details, figcaption {

  302.     font-size: calc( 1rem + .6 * (100vw - 20rem) / (50 - 20) );

  303.     line-height: calc( 1.5em + 0.2 * (100vw - 50rem) / (20 - 50) );

  304.     margin-left: 0;

  305.   }

  306.   h1 {

  307.     font-size: calc( 1.9rem + 1.5 * (100vw - 20rem) / (50 - 20) );

  308.     line-height: calc( 1.2em + 0.2 * (100vw - 50rem) / (20 - 50) );

  309.   }

  310.   h2 {

  311.     font-size: calc( 1.5rem + 1.5 * (100vw - 20rem) / (50 - 20) );

  312.     line-height: calc( 1.3em + 0.2 * (100vw - 50rem) / (20 - 50) );

  313.   }

  314.   h3 {

  315.     font-size: calc( 1.35rem + 1.5 * (100vw - 20rem) / (50 - 20) );

  316.     line-height: calc( 1.4em + 0.2 * (100vw - 50rem) / (20 - 50) );

  317.   }

  318. }

  319. @media (min-width: 50em) {

  320.   /* The right part of the addition *must* be a

  321.      rem value. In this example we *could* change

  322.      the whole declaration to font-size:2.5rem,

  323.      but if our baseline value was not expressed

  324.      in rem we would have to use calc. */

  325.   p, li, pre, code, kbd, samp, var, tt, time, details, figcaption {

  326.     font-size: calc( 1rem + .6 * 1rem );

  327.     line-height: 1.5em;

  328.   }

  329.   p, li, pre, details {

  330.     margin-left: 3rem;

  331.   }

  332.   h1 {

  333.     font-size: calc( 1.9rem + 1.5 * 1rem );

  334.     line-height: 1.2em;

  335.   }

  336.   h2 {

  337.     font-size: calc( 1.5rem + 1.5 * 1rem );

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  340.   h3 {

  341.     font-size: calc( 1.35rem + 1.5 * 1rem );

  342.     line-height: 1.4em;

  343.   }

  344.   figure img {

  345.     max-width: 500px;

  346.     max-height: 500px;

  347.   }

  348. }

  349. 

  350. figure.unsquared {

  351.   margin-bottom: 1.5rem;

  352. }

  353.   figure.unsquared img {

  354.     height: inherit;

  355.   }

  356. 

  357. 

  358. 

  359. @media print {

  360.   body { font-size: 100%; }

  361.   a:after { content: " (" attr(href) ")"; }

  362.   a, a:link, a:visited, a:after {

  363.     text-decoration: underline;

  364.     text-shadow: none !important;

  365.     background-image: none !important;

  366.     background: white;

  367.     color: black;

  368.   }

  369.   abbr[title] { border-bottom: 0; }

  370.   abbr[title]:after { content: " (" attr(title) ")"; }

  371.   img { page-break-inside: avoid; }

  372.   @page { margin: 2cm .5cm; }

  373.   h1, h2, h3 { page-break-after: avoid; }

  374.   p3 { orphans: 3; widows: 3; }

  375.   img {

  376.     max-width: 250px !important;

  377.     max-height: 250px !important;

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  379.   nav, aside { display: none; }

  380. }

  381. 

  382. ul.with_columns {

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  384. }

  385. @media (min-width: 20em) {

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  390. @media (min-width: 50em) {

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  406.   }

  407. }

  408. 

  409. .gallery {

  410.   display: flex;

  411.   flex-wrap: wrap;

  412.   justify-content: space-around;

  413. }

  414.   .gallery figure img {

  415.     margin-left: 1rem;

  416.     margin-right: 1rem;

  417.   }

  418.   .gallery figure figcaption {

  419.     font-family: 'ConcourseT3'

  420.   }

  421. 

  422. footer {

  423.   font-family: 'ConcourseT3';

  424.   display: flex;

  425.   flex-direction: column;

  426.   border-top: 3px solid white;

  427.   padding: 4rem 0;

  428.   background-color: #07486c;

  429.   color: white;

  430. }

  431.   footer > * {

  432.     max-width: 50rem;

  433.     margin: 0 auto;

  434.   }

  435.   footer a {

  436.     color: #f1c40f;

  437.   }

  438.   footer .avatar {

  439.     width: 200px;

  440.     height: 200px;

  441.     border-radius: 50%;

  442.     float: left;

  443.     -webkit-shape-outside: circle();

  444.     shape-outside: circle();

  445.     margin-right: 2rem;

  446.     padding: 2px 5px 5px 2px;

  447.     background: white;

  448.     border-left: 1px solid #f1c40f;

  449.     border-top: 1px solid #f1c40f;

  450.     border-right: 5px solid #f1c40f;

  451.     border-bottom: 5px solid #f1c40f;

  452.   }

  453. </style>

  454. 

  455. <h1>

  456.   <span><a id="jumper" href="#jumpto" title="Un peu perdu ?">?</a></span>

  457.   A warm welcome to DNS (archive)

  458.   <time>Pour la pérennité des contenus liés. Non-indexé, retrait sur simple email.</time>

  459. </h1>

  460. <section>

  461.   <article>

  462.     <h3><a href="https://powerdns.org/hello-dns/">Source originale du contenu</a></h3>

  463.     <p>This series of documents attempts to provide a correct introduction to the

  464. Domain Name System as of 2018.  The original RFCs remain the authoritative

  465. source of normative text, but this document tries to make this venerable

  466. protocol more accessible, while maintaining full alignment with all relevant

  467. and useful RFCs.</p>

  468. <p>This effort is developed cooperatively on GitHub, the repository can be

  469. found <a href="here">https://github.com/ahupowerdns/hello-dns/</a> and help is highly

  470. welcome!  Feedback can also be sent to bert.hubert@powerdns.com or

  471. <a href="https://twitter.com/PowerDNS_Bert">@PowerDNS_Bert</a>.</p>

  472. <p>Although we start from relatively basic principles, the reader is expected

  473. to know what IP addresses are, what a (stub) resolver is and what an

  474. authoritative server is supposed to do.  When in doubt: authoritative

  475. servers 'host' DNS data, 'resolvers' look up things over at authoritative

  476. servers and clients run 'stub resolvers' to look things up over at

  477. resolvers.  This document is aimed at developers, but may also be of aid for

  478. administrators.</p>

  479. <p>DNS was originally written down in August 1979 in '<a href="https://www.rfc-editor.org/ien/ien116.txt">IEN

  480. 116</a>', part of a parallel

  481. series of documents describing the Internet.  IEN 116-era DNS is not

  482. compatible with today's DNS.  In 1983, RFC 882 and 883 were released,

  483. describing a version of the DNS very similar but not quite interoperable

  484. with the one we have today.</p>

  485. <p>DNS attained its modern form in 1987 when RFC 1034 and 1035 were published.

  486. Although much of 1034/1035 remains valid, these standards are not that easy

  487. to read because they were written in a very different time. There are 100s

  488. of pages of updates that can only be found in later documents.</p>

  489. <p>The main goal of this effort is not to contradict the DNS RFCs but to

  490. provide an easier entrypoint into understanding the Domain Name System.</p>

  491. <p>If you will, the goal is to be a mini "<a href="https://en.wikipedia.org/wiki/TCP/IP_Illustrated">TCP/IP

  492. Illustrated</a>" of DNS. For

  493. more about the philosophy of these documents, and how to contribute, please read

  494. <a href="meta.md.html">meta.md</a>.

  495. Your help &amp; insights are highly welcome!</p>

  496. <p>I want to thank Ólafur Guðmundsson and Job Snijders for their input and

  497. enthusiasm for improving the state of DNS.</p>

  498. <h2>Layout</h2>

  499. <p>The content is spread out over several documents:</p>

  500. <ul>

  501. <li><a href="basic.md.html">The core of DNS</a></li>

  502. <li><a href="stub.md.html">Relevant to stub resolvers and applications</a></li>

  503. <li><a href="auth.md.html">Relevant to authoritative servers</a></li>

  504. <li><a href="tdns/README.md.html">tdns: a 'from scratch' teaching authoritative server, implementing all of basic DNS in 1100 lines of code</a></li>

  505. <li><a href="resolver.md.html">Relevant to resolvers</a></li>

  506. <li>Optional elements: <a href="optional.md.html">EDNS, TSIG, Dynamic Updates, DNAME, DNS Cookies</a></li>

  507. <li><a href="privacy.md.html">Privacy related</a>: QName minimization, DNS-over-TLS, DNS-over-HTTPS, EDNS Padding</li>

  508. <li><a href="dnssec.md.html">DNSSEC</a></li>

  509. <li><a href="non-ietf.md.html">non-IETF standards</a>: RRL and RPZ</li>

  510. <li><a href="rare.md.html">Rare parts of DNS</a> - not obsolete, but not frequently encountered in production</li>

  511. </ul>

  512. <p>We start off with a general introduction of DNS basics: what is a resource

  513. record, what is an RRSET, what is a zone, what is a zone-cut, how are packets

  514. laid out. This part is required reading for anyone ever wanting to query a

  515. nameserver or emit a valid response.</p>

  516. <p>We then specialize into what applications can expect when they send

  517. questions to a resolver, or what a stub-resolver can expect.</p>

  518. <p>The next part is about what an authoritative server is supposed to do. On

  519. top of this, we describe in slightly less detail how a resolver could

  520. operate. Finally, there is a section on optional elements like EDNS, TSIG,

  521. Dynamic Updates and DNSSEC</p>

  522. <p>RFCs, especially earlier ones, tend to describe servers that perform both

  523. authoritative and resolver functions. This turns out to make both code and

  524. troubleshooting harder. Therefore, in these documents, the authoritative and

  525. caching functions are described separately.</p>

  526. <p>Next up: <a href="basic.md.html">DNS Basics</a>.</p>

  527.   </article>

  528. </section>

  529. 

  530. 

  531. <nav id="jumpto">

  532.   <p>

  533.     <a href="/david/blog/">Accueil du blog</a> |

  534.     <a href="https://powerdns.org/hello-dns/">Source originale</a> |

  535.     <a href="/david/stream/2019/">Accueil du flux</a>

  536.   </p>

  537. </nav>

  538. 

  539. <footer>

  540.   <div>

  541.     <img src="/static/david/david-larlet-avatar.jpg" loading="lazy" class="avatar" width="200" height="200">

  542.     <p>

  543.       Bonjour/Hi!

  544.       Je suis <a href="/david/" title="Profil public">David&nbsp;Larlet</a>, je vis actuellement à Montréal et j’alimente cet espace depuis 15 ans. <br>

  545.       Si tu as apprécié cette lecture, n’hésite pas à poursuivre ton exploration. Par exemple via les <a href="/david/blog/" title="Expériences bienveillantes">réflexions bimestrielles</a>, la <a href="/david/stream/2019/" title="Pensées (dés)articulées">veille hebdomadaire</a> ou en t’abonnant au <a href="/david/log/" title="S’abonner aux publications via RSS">flux RSS</a> (<a href="/david/blog/2019/flux-rss/" title="Tiens c’est quoi un flux RSS ?">so 2005</a>).

  546.     </p>

  547.     <p>

  548.       Je m’intéresse à la place que je peux avoir dans ce monde. En tant qu’humain, en tant que membre d’une famille et en tant qu’associé d’une coopérative. De temps en temps, je fais aussi des <a href="https://github.com/davidbgk" title="Principalement sur Github mais aussi ailleurs">trucs techniques</a>. Et encore plus rarement, <a href="/david/talks/" title="En ce moment je laisse plutôt la place aux autres">j’en parle</a>.

  549.     </p>

  550.     

  551.     <p>

  552.       Voici quelques articles choisis :

  553.       <a href="/david/blog/2019/faire-equipe/" title="Accéder à l’article complet">Faire équipe</a>,

  554.       <a href="/david/blog/2018/bivouac-automnal/" title="Accéder à l’article complet">Bivouac automnal</a>,

  555.       <a href="/david/blog/2018/commodite-effondrement/" title="Accéder à l’article complet">Commodité et effondrement</a>,

  556.       <a href="/david/blog/2017/donnees-communs/" title="Accéder à l’article complet">Des données aux communs</a>,

  557.       <a href="/david/blog/2016/accompagner-enfant/" title="Accéder à l’article complet">Accompagner un enfant</a>,

  558.       <a href="/david/blog/2016/senior-developer/" title="Accéder à l’article complet">Senior developer</a>,

  559.       <a href="/david/blog/2016/illusion-sociale/" title="Accéder à l’article complet">L’illusion sociale</a>,

  560.       <a href="/david/blog/2016/instantane-scopyleft/" title="Accéder à l’article complet">Instantané Scopyleft</a>,

  561.       <a href="/david/blog/2016/enseigner-web/" title="Accéder à l’article complet">Enseigner le Web</a>,

  562.       <a href="/david/blog/2016/simplicite-defaut/" title="Accéder à l’article complet">Simplicité par défaut</a>,

  563.       <a href="/david/blog/2016/minimalisme-esthetique/" title="Accéder à l’article complet">Minimalisme et esthétique</a>,

  564.       <a href="/david/blog/2014/un-web-omni-present/" title="Accéder à l’article complet">Un web omni-présent</a>,

  565.       <a href="/david/blog/2014/manifeste-developpeur/" title="Accéder à l’article complet">Manifeste de développeur</a>,

  566.       <a href="/david/blog/2013/confort-convivialite/" title="Accéder à l’article complet">Confort et convivialité</a>,

  567.       <a href="/david/blog/2013/testament-numerique/" title="Accéder à l’article complet">Testament numérique</a>,

  568.       et <a href="/david/blog/" title="Accéder aux archives">bien d’autres…</a>

  569.     </p>

  570.     <p>

  571.       On peut <a href="mailto:david%40larlet.fr" title="Envoyer un courriel">échanger par courriel</a>. Si éventuellement tu souhaites que l’on travaille ensemble, tu devrais commencer par consulter le <a href="http://larlet.com">profil dédié à mon activité professionnelle</a> et/ou contacter directement <a href="http://scopyleft.fr/">scopyleft</a>, la <abbr title="Société coopérative et participative">SCOP</abbr> dont je fais partie depuis six ans. Je recommande au préalable de lire <a href="/david/blog/2018/cout-site/" title="Attention ce qui va suivre peut vous choquer">combien coûte un site</a> et pourquoi je suis plutôt favorable à une <a href="/david/pro/devis/" title="Discutons-en !">non-demande de devis</a>.

  572.     </p>

  573.     <p>

  574.       Je ne traque pas ta navigation mais mon

  575.       <abbr title="Alwaysdata, 62 rue Tiquetonne 75002 Paris, +33.184162340">hébergeur</abbr>

  576.       conserve des logs d’accès.

  577.     </p>

  578.   </div>

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