{"id":372,"date":"2025-12-17T21:09:51","date_gmt":"2025-12-18T00:09:51","guid":{"rendered":"https:\/\/duvidaonline.com.br\/?p=372"},"modified":"2025-12-17T21:09:52","modified_gmt":"2025-12-18T00:09:52","slug":"windows-server-dns-com-priorizacao-de-subnet-e-round-robin","status":"publish","type":"post","link":"https:\/\/duvidaonline.com.br\/en\/blog\/2025\/12\/17\/windows-server-dns-com-priorizacao-de-subnet-e-round-robin\/","title":{"rendered":"Windows Server DNS with Subnet Prioritization and Round-Robin"},"content":{"rendered":"<p class=\"has-text-align-right\">A poorly planned subnet does not break during deployment. It breaks when the company grows.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p class=\"translation-block\">Hello!<br>Today we're going to talk about a <strong>behavior in Windows networks<\/strong> that you should <strong>ALWAYS take into consideration<\/strong> when designing or implementing your <strong>subnet plan<\/strong>, especially in any scope that involves <strong>at least two \/24 networks<\/strong>.<\/p>\n\n\n\n<p class=\"translation-block\">Giving a <em>spoiler<\/em> for those in a hurry:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>AVOID USING NON-SEQUENTIAL RANGES IN YOUR SUBNET DEFINITIONS AS MUCH AS POSSIBLE.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"translation-block\">This is not just a good organizational practice. It is a poorly documented internal characteristic of Windows Server DNS that directly impacts latency, authentication, GPO, DFS, LDAP, and the scalability of environments with distributed Active Directory.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Exemplos de planejamento de subnets<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 Correct (sequential) examples<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>10.0.0.0\/24<\/code> and <code>10.0.1.0\/24<\/code><\/li>\n\n\n\n<li><code>172.20.0.0\/24<\/code> and <code>172.20.1.0\/24<\/code><\/li>\n\n\n\n<li><code>192.168.50.0\/24<\/code> , <code>192.168.51.0\/24<\/code>, 192.168.52.0\/24, 192.168.53.0\/24<\/li>\n<\/ul>\n\n\n\n<p>These models allow:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>binary continuity<\/li>\n\n\n\n<li>logical summarization<\/li>\n\n\n\n<li>predictable growth<\/li>\n\n\n\n<li><strong>correct subnet prioritization in DNS<\/strong><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u274c Incorrect (non-sequential) examples<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>10.0.0.0\/24<\/code> and <code>192.168.0.0\/24<\/code><\/li>\n\n\n\n<li><code>172.40.0.0\/24<\/code> and <code>10.5.0.0\/24<\/code><\/li>\n\n\n\n<li><code>172.100.100.0\/24<\/code> and <code>192.168.100.0\/24<\/code><\/li>\n<\/ul>\n\n\n\n<p class=\"translation-block\">These scenarios create <strong>addressing islands<\/strong>, which:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>They cannot be represented by a single mask.<\/li>\n\n\n\n<li>They break the logic of proximity in DNS.<\/li>\n\n\n\n<li class=\"translation-block\">force the use of pure round-robin<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Network topology \u2014 why does this article exist?<\/h2>\n\n\n\n<p class=\"translation-block\">Before delving into advanced settings, it's essential to understand the problem this article solves.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Scenario 1 \u2014 Single site, single subnet<\/h3>\n\n\n\n<p class=\"translation-block\">You are at a workstation on a <strong>local<\/strong> network<\/strong>, at a <strong>single<\/strong> site<\/strong>, and you need to perform a DNS query.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/duvidaonline.com.br\/wp-content\/uploads\/2025\/12\/Topologia-de-redes-01.drawio.svg\" alt=\"\" class=\"wp-image-388\"\/><\/figure>\n\n\n\n<p>Fluxo:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The station asks which DNS servers are available.<\/li>\n\n\n\n<li>There is only one DNS server.<\/li>\n\n\n\n<li>The answer comes from him.<\/li>\n<\/ul>\n\n\n\n<p>&#x2705; Tudo funciona corretamente.<br>Nesse cen\u00e1rio, qualquer erro estrutural fica mascarado.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Scenario 2 \u2014 Forest with two sites and a single subnet in each site.<\/h3>\n\n\n\n<p class=\"translation-block\">Now the forest has <strong>two sites<\/strong>, each with its own DNS.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/duvidaonline.com.br\/wp-content\/uploads\/2025\/12\/Topologia-de-redes-02.drawio.svg\" alt=\"\" class=\"wp-image-389\"\/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"translation-block\">The station is <strong>on the same subnet as the local DNS<\/strong><\/li>\n\n\n\n<li>Active Directory correctly associates the subnet with the site.<\/li>\n\n\n\n<li>The local DNS responds<\/li>\n<\/ul>\n\n\n\n<p>&#x2705; Baixa lat\u00eancia<br>&#x2705; Comportamento previs\u00edvel<\/p>\n\n\n\n<p class=\"translation-block\">Still, the problem <strong>doesn't appear<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Scenario 3 \u2014 Two sites, different subnets between workstations, and local DNS.<\/h3>\n\n\n\n<p>Here is the critical scenario.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/duvidaonline.com.br\/wp-content\/uploads\/2025\/12\/Topologia-de-redes-03.drawio.svg\" alt=\"\" class=\"wp-image-390\"\/><\/figure>\n\n\n\n<p>You are at a workstation:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>in a different subnet than the local DNS subnet<\/li>\n\n\n\n<li>in a forest with two sites<\/li>\n\n\n\n<li>each website with its own DNS server<\/li>\n<\/ul>\n\n\n\n<p>In this case:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Both DNS servers are valid.<\/li>\n\n\n\n<li class=\"translation-block\">By default, Windows configuration does not guarantee priority.<\/li>\n<\/ul>\n\n\n\n<p>Result:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The answer depends.<\/li>\n\n\n\n<li class=\"translation-block\">The query can go to the local DNS.<\/li>\n\n\n\n<li class=\"translation-block\">Or you can go to a remote DNS server.<\/li>\n\n\n\n<li class=\"translation-block\">The decision is made in a round-robin format, seemingly at random.<\/li>\n<\/ul>\n\n\n\n<p>\ud83d\udc49 In the scenario above, the behavior becomes this:<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd34 When the DNS responds outside the correct website<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>&#x26a0;&#xfe0f; <strong>Aten\u00e7\u00e3o: este n\u00e3o \u00e9 um problema de falha, \u00e9 um problema de previsibilidade<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"translation-block\">When DNS in an Active Directory environment responds outside the correct site, the environment continues to function, but it begins to exhibit inconsistent behavior, which is difficult to diagnose and becomes increasingly costly as the infrastructure grows.<\/p>\n\n\n\n<p>The most common impacts are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Slow or inconsistent user logins<\/li>\n\n\n\n<li>Inconsistent authentication (sometimes local, sometimes remote)<\/li>\n\n\n\n<li>GPO application taking too long or failing intermittently.<\/li>\n\n\n\n<li>Failures to find resources\/hosts that only exist locally.<\/li>\n\n\n\n<li>DC Locator unpredictable<\/li>\n\n\n\n<li>DFS \/ latency-sensitive applications<\/li>\n\n\n\n<li>Intermittent problems that are difficult to diagnose.<\/li>\n\n\n\n<li>Difficulty in troubleshooting<\/li>\n\n\n\n<li>Unjustified increase in WAN dependency<\/li>\n\n\n\n<li>Loss of logical isolation between sites<\/li>\n\n\n\n<li>The need for unrestricted communication between all sites.<\/li>\n<\/ul>\n\n\n\n<p>&#x1f449; <strong>Nada quebra de vez \u2014 tudo fica imprevis\u00edvel.<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">The poorly documented feature of Windows DNS<\/h2>\n\n\n\n<p class=\"translation-block\">Windows Server DNS has a mechanism called <strong>DNS Subnet Prioritization<\/strong>, controlled by the following keys:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>HKLM\\SYSTEM\\CurrentControlSet\\Services\\DNS\\Parameters\\LocalNetPriority\nHKLM\\SYSTEM\\CurrentControlSet\\Services\\DNS\\Parameters\\LocalNetPriorityNetMask\n<\/code><\/pre>\n\n\n\n<p>\u26a0\ufe0f Important:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Does not use Sites and Services<\/li>\n\n\n\n<li>It does not use link costs.<\/li>\n\n\n\n<li>It does not use an AD subnet.<\/li>\n\n\n\n<li class=\"translation-block\">Uses <strong>only binary IP mask comparison<\/strong><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Configuring subnet prioritization in DNS<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1\ufe0f\u20e3 Enabling LocalNetPriority<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>Chave: LocalNetPriority\nTipo:  REG_DWORD\nValor: 1\n<\/code><\/pre>\n\n\n\n<p class=\"translation-block\">Enables DNS to <strong>prioritize records considered local<\/strong> before round-robin.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2\ufe0f\u20e3 Configuring LocalNetPriorityNetMask<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>Chave: LocalNetPriorityNetMask\nTipo:  REG_DWORD\nValor: m\u00e1scara em hexadecimal\n<\/code><\/pre>\n\n\n\n<p class=\"translation-block\">This mask defines which part of the IP address the DNS considers to be the local network.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">How to calculate the LocalNetPriorityNetMask mask<\/h2>\n\n\n\n<p class=\"translation-block\">The mask is <strong>not the traditional subnet mask<\/strong>.<\/p>\n\n\n\n<p>The calculation is done like this:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Start with <code>255.255.255.255<\/code><\/li>\n\n\n\n<li>Subtract the desired subnet mask.<\/li>\n\n\n\n<li>Convert the result to hexadecimal.<\/li>\n\n\n\n<li>Remove the stitches<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Example \/21 (255.255.248.0)<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>255 255 255 255\n255 255 248   0\n----------------\n0   0   7   255\n<\/code><\/pre>\n\n\n\n<p>Hexadecimal:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>000007ff\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Example \/20 (255.255.240.0)<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>255 255 255 255\n255 255 240   0\n----------------\n0   0   15  255\n<\/code><\/pre>\n\n\n\n<p>Hexadecimal:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>00000fff\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Example \/16 (255.255.0.0)<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>255 255 255 255\n255 255   0   0\n----------------\n0   0   255 255\n<\/code><\/pre>\n\n\n\n<p>Hexadecimal:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>0000ffff\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Example \/22 (255.255.252.0)<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>255 255 255 255\n255 255 252   0\n----------------\n0   0   3   255\n<\/code><\/pre>\n\n\n\n<p>Hexadecimal:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>000003ff\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Relationship between subnet prioritization and round-robin<\/h2>\n\n\n\n<p>The final behavior of DNS is:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li class=\"translation-block\">Prioritizes IPs considered <strong>local<\/strong><\/li>\n\n\n\n<li class=\"translation-block\">Within the local set, apply <strong>round-robin<\/strong><\/li>\n\n\n\n<li>Se n\u00e3o houver IP local:\n<ul class=\"wp-block-list\">\n<li>round-robin global<\/li>\n\n\n\n<li>ordem imprevis\u00edvel<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Why do non-sequential ranges break this logic?<\/h2>\n\n\n\n<p>If you use subnets like:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>10.0.10.0\/24<\/code><\/li>\n\n\n\n<li><code>10.0.20.0\/24<\/code><\/li>\n\n\n\n<li><code>10.0.30.0\/24<\/code><\/li>\n<\/ul>\n\n\n\n<p>&#x1f449; <strong>n\u00e3o existe m\u00e1scara bin\u00e1ria \u00fanica que represente esse padr\u00e3o<\/strong>, ou ser\u00e1 necess\u00e1rio <strong>utilizar uma m\u00e1scara excessivamente ampla<\/strong>, englobando endere\u00e7os que <strong>n\u00e3o deveriam ser considerados locais<\/strong>.<\/p>\n\n\n\n<p>Result:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>LocalNetPriority loses effect.<\/li>\n\n\n\n<li>DNS operates as pure round-robin.<\/li>\n\n\n\n<li>unpredictable behavior appears<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u2705 Symptom checklist \u2014 quick diagnosis in production<\/h2>\n\n\n\n<p class=\"translation-block\">Use this checklist as a practical confirmation of the problem described so far.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u2610 User login takes longer on some days than on others.<\/li>\n\n\n\n<li class=\"translation-block\">\u2610 <code>gpupdate \/force<\/code> delay for no apparent reason<\/li>\n\n\n\n<li class=\"translation-block\">\u2610 <code>nltest \/dsgetdc<\/code> returns DCs from other sites<\/li>\n\n\n\n<li>\u2610 Applications work locally, but fail randomly.<\/li>\n\n\n\n<li>\u2610 DFS Namespace points to remote servers<\/li>\n\n\n\n<li>\u2610 Replications seem slow with no clear error.<\/li>\n\n\n\n<li>\u2610 Scripts and automations are exhibiting erratic behavior.<\/li>\n\n\n\n<li>\u2610 Administrative tools connect to incorrect DCs<\/li>\n\n\n\n<li>\u2610 Firewalls need to allow excessive traffic between websites.<\/li>\n\n\n\n<li>\u2610 Diagnosis always begins with \u201cbut the DNS responds\u2026\u201d<\/li>\n<\/ul>\n\n\n\n<p>&#x1f449; <strong>Se parece aleat\u00f3rio, geralmente n\u00e3o \u00e9.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83e\udde0 Conclusion<\/h2>\n\n\n\n<p class=\"translation-block\">Subnet planning in Windows environments is not just routing. It's internal DNS behavior, based on binary masks, and not on administrative logic.<\/p>\n\n\n\n<p class=\"translation-block\">The biggest mistake in Active Directory is <strong>not creating something that doesn't work<\/strong>.<br>It's creating something that works <strong>without predictability<\/strong>.<\/p>\n\n\n\n<p>Windows Server DNS:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>does not understand administrative intent<\/li>\n\n\n\n<li>does not consider \"logical proximity\"<\/li>\n\n\n\n<li class=\"translation-block\">decides based on <strong>subnet, mask, and prioritization<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"translation-block\">When subnet planning is poorly done \u2014 especially with non-sequential ranges \u2014 the DNS loses the ability to correctly decide who is closest, and the environment becomes dependent on round-robin and luck.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"translation-block\"><strong>Active Directory architecture isn't about making it work today. <br>It's about ensuring it remains predictable tomorrow.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"translation-block\">Planning subnets correctly and configuring subnet prioritization in DNS <strong>is not optimization. <\/strong>.<br> <strong>It's the foundation.<\/strong>.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>A well-planned sequential subnet + a well-configured LocalNetPriority = predictable, fast, and scalable DNS.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>Ignoring this is a sure way to guarantee:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>problematic growth<\/li>\n\n\n\n<li>complex troubleshooting<\/li>\n\n\n\n<li>and incidents that are difficult to reproduce.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Author's note<\/h3>\n\n\n\n<p class=\"translation-block\">This article originated from real-world problems observed in production environments, throughout projects involving distributed Active Directory, multiple sites, and Windows Server DNS.<\/p>\n\n\n\n<p class=\"translation-block\">The main motivation was to document a behavior that is <strong>underexplored in the official documentation<\/strong>, but which directly impacts the <strong>latency, predictability, and scalability<\/strong> of Windows environments: <strong>subnet prioritization in DNS<\/strong>.<\/p>\n\n\n\n<p class=\"translation-block\">The goal here is not just to teach a configuration, but to explain the technical reasoning behind it, so that architects and administrators can correctly plan their networks before the problem arises.<\/p>\n\n\n\n<p>If this article prevents even a single unpredictable environment in the future, it has already fulfilled its purpose.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Subnet mal planejada n\u00e3o quebra na implanta\u00e7\u00e3o. Quebra quando a empresa cresce. Introdu\u00e7\u00e3o Ol\u00e1!Hoje vamos falar de um comportamento em redes Windows que voc\u00ea deveria SEMPRE levar em considera\u00e7\u00e3o ao projetar ou implementar o seu plano de subnets, principalmente em&#8230;<\/p>","protected":false},"author":1,"featured_media":391,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[43,45,44,42],"tags":[],"class_list":["post-372","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dns","category-network","category-redes","category-windows-server"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Windows Server DNS com prioriza\u00e7\u00e3o de subnet e round-robin - D\u00favida Online Informa\u00e7\u00e3o e Tecnologia<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/duvidaonline.com.br\/en\/blog\/2025\/12\/17\/windows-server-dns-com-priorizacao-de-subnet-e-round-robin\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Windows Server DNS com prioriza\u00e7\u00e3o de subnet e round-robin - D\u00favida Online Informa\u00e7\u00e3o e Tecnologia\" \/>\n<meta property=\"og:description\" content=\"Subnet mal planejada n\u00e3o quebra na implanta\u00e7\u00e3o. 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