{"id":1101,"date":"2023-07-24T10:13:14","date_gmt":"2023-07-24T13:13:14","guid":{"rendered":"http:\/\/www.tech-nico.com\/blog\/?p=1101"},"modified":"2023-07-24T10:13:16","modified_gmt":"2023-07-24T13:13:16","slug":"routeros-controlar-filtrar-contenido-por-dns-2023","status":"publish","type":"post","link":"http:\/\/www.tech-nico.com\/blog\/routeros-controlar-filtrar-contenido-por-dns-2023\/","title":{"rendered":"RouterOS &#8211; Controlar \/ Filtrar contenido por DNS 2023"},"content":{"rendered":"<div id=\"advads-266222606\" class=\"advads-antes-de-contenido advads-entity-placement\" style=\"float: left;\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-0513087877342686\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block; text-align:center;\" data-ad-client=\"ca-pub-0513087877342686\" \ndata-ad-slot=\"6331524197\" \ndata-ad-layout=\"in-article\"\ndata-ad-format=\"fluid\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div><br style=\"clear: both; display: block; float: none;\"\/>\n<p class=\"wp-block-paragraph\">En muchas ocasiones he tenido que controlar mediante QoS algunas cuestiones como las actualizaciones de windows, o las redes sociales, y en otros casos filtra Whatsapp. <br><a href=\"https:\/\/www.opendns.com\/\">OpenDNS<\/a> de Cisco permite mediante un dashboard poder ir tildando y destildando contenidos a filtrar. <br>Anda bien pero no te deja discriminar. Por ejemplo filtra \u00abRedes Sociales\u00bb pero el termino es muy grande y termina cometiendo errores. Si tildas por ejemplo \u00abFile Sharing\u00bb los audios de Whatsapp no se envian. <br>Entonces para evitar este tipo de problemas lo que hacemos es armar nuestro script que marque por nombre de dominio. <\/p><div id=\"advads-19056690\" class=\"advads-contenido-de-la-entrada advads-entity-placement\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-0513087877342686\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block; text-align:center;\" data-ad-client=\"ca-pub-0513087877342686\" \ndata-ad-slot=\"6331524197\" \ndata-ad-layout=\"in-article\"\ndata-ad-format=\"fluid\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Te deja utilizar los filtros de manera gratuita para 1 direccion IP por cuenta. Es decir que para 1 red nateada andaria bien. Tiene para tildar por defecto redes bogon, sitios que propagan malware, pornografia, etc.<\/p>\n<cite>OpenDNS<\/cite><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">El script<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Para que funcione correctamente tenemos que habilitar el cache de DNS de nuestro router y hacer resolver a nuestos clientes con los DNS del router. Luego siempre dropear el DNS input en el firewall para que no nos ataquen los DNS desde afuera.  <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lo que hace el script es buscar una palabra que coincida en el nombre del dominio. <\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># Use DNS Entrys and add Address to the Firewall Address-list #\n:foreach i in=&#91;\/ip dns cache all find where ( (name~\"instagram\") || (name~\"facebook\") || (name~\"twitter\") || (name~\"twitch\") ) &amp;&amp; (type=\"A\") &amp;&amp; (data!=0.0.0.0) ] do={\n:local tmpAddress &#91;\/ip dns cache get $i data];\ndelay delay-time=10ms;\n# prevent script from using all cpu time #\n:if ( &#91;\/ip firewall address-list find where address=$tmpAddress] = \"\") do={ \n:local cacheName &#91;\/ip dns cache get $i name] ;\n#:log info (\"added entry: $cacheName $tmpAddress\");\n\/ip firewall address-list add address=$tmpAddress list=RedesSociales comment=$cacheName timeout=6d;\n}\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Si se fijan donde dice: <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">(name~\u00bb<strong>instagram<\/strong>\u00ab) || (name~\u00bb<strong>facebook<\/strong>\u00ab) || (name~\u00bb<strong>twitter<\/strong>\u00ab) || (name~\u00bb<strong>twitch<\/strong>\u00ab) <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Modificamos a nuestro antojo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Y mas abajo le damos el nombre al Address-List:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\/ip firewall address-list add address=$tmpAddress list=<strong>RedesSociales<\/strong> comment=$cacheName <strong>timeout=6d<\/strong>;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tambien pueden modificar el <strong>timeout<\/strong>: Todas las direcciones nuevas que resuelva las va agregando al AddressList (en este caso las mantiene por 6 dias), esto hace que tengamos un segundo cache que se vaya limpiando cada 6 dias y las direcciones IP viejas se vayan eliminando automaticamente.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Luego solo nos queda hacer algo con ese address list. Podemso dropearlo en el firewall. <br>O bien crear un mangle que marque la conexion con destino a esas IP y luego usarlo en Queues.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Por ejemplo:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/ip firewall filter\nadd action=drop chain=forward dst-address-list=RedesSociales in-interface=bridge_alumnos\nadd action=drop chain=output dst-address-list=RedesSociales out-interface=bridge_alumnos<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Ojo que en mi caso ademas le digo en que interfaz eliminar las redes sociales. Elijan la interfaz para su caso.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">origen: <a href=\"http:\/\/tech-nico.com\">tech-nico.com<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>En muchas ocasiones he tenido que controlar mediante QoS algunas cuestiones como las actualizaciones de windows, o las redes sociales, y en otros casos filtra Whatsapp. OpenDNS de Cisco permite mediante un dashboard poder ir tildando y destildando contenidos a &hellip; <a href=\"http:\/\/www.tech-nico.com\/blog\/routeros-controlar-filtrar-contenido-por-dns-2023\/\">Sigue leyendo <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":600,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[74,73,3],"tags":[],"class_list":["post-1101","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mikrotik","category-scripts","category-trucos"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>RouterOS - Controlar \/ Filtrar contenido por DNS 2023 &#183; 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