{"id":510,"date":"2026-06-20T07:13:40","date_gmt":"2026-06-20T07:13:40","guid":{"rendered":"https:\/\/ahoraeg.com\/tecnobits\/?p=510"},"modified":"2026-06-20T07:13:43","modified_gmt":"2026-06-20T07:13:43","slug":"que-es-un-firewall","status":"publish","type":"post","link":"https:\/\/ahoraeg.com\/tecnobits\/conceptode\/que-es-un-firewall\/","title":{"rendered":"\u00bfQu\u00e9 es\u00a0un\u00a0firewall? Tipos de firewall y c\u00f3mo funciona"},"content":{"rendered":"\n<h2 id=\"h-que-es-nbsp-un-nbsp-firewall\" class=\"wp-block-heading\">\u00bfQu\u00e9 es&nbsp;un&nbsp;<em>firewall<\/em>?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">En inform\u00e1tica, y m\u00e1s espec\u00edficamente en las telecomunicaciones, se entiende por <strong><em>firewall<\/em><\/strong>\u00a0(en ingl\u00e9s) o\u00a0cortafuegos\u00a0a un sistema o dispositivo capaz de permitir, limitar, cifrar o decodificar el tr\u00e1fico de comunicaciones entre un computador (o una red local) y el resto de la <a href=\"https:\/\/ahoraeg.com\/tecnobits\/conceptode\/que-es-internet\/\" type=\"post\" id=\"323\">Internet<\/a>, impidiendo que usuarios o sistemas no autorizados tengan acceso.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un\u00a0firewall\u00a0puede bien ser de tipo f\u00edsico o digital, es decir, un aparato o una pieza de <a href=\"https:\/\/ahoraeg.com\/tecnobits\/conceptode\/que-es-un-software\/\" type=\"post\" id=\"332\">software<\/a>, y en ambos casos <strong>constituye apenas un primer paso de defensa en el mundo de las redes inform\u00e1ticas<\/strong>, indispensable pero no suficiente para garantizar la seguridad frente a ataques cibern\u00e9ticos e intromisiones de terceros.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Este tipo de tecnolog\u00edas toman su nombre prestado del mecanismo para la prevenci\u00f3n de incendios que suele aplicarse en \u00e1reas verdes o en edificaciones vulnerables, y que consiste en un muro o en un \u00e1rea bald\u00eda, libre de cualquier contenido inflamable, que limita la expansi\u00f3n indefinida del fuego en caso de incendio.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Los precursores del&nbsp;firewall&nbsp;<strong>surgieron durante la d\u00e9cada de 1980<\/strong>, cuando Internet era todav\u00eda un campo reciente del saber y&nbsp;no se hab\u00eda considerado a\u00fan el margen de da\u00f1o posible a trav\u00e9s del&nbsp;<em>hackeo<\/em>&nbsp;o terrorismo cibern\u00e9tico.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Desde los primeros ataques cibern\u00e9ticos masivos por parte de virus y gusanos digitales a principios de la d\u00e9cada siguiente, <strong>la protecci\u00f3n digital ha ido extrem\u00e1ndose y perfeccion\u00e1ndose<\/strong>, al ritmo en que aparecen nuevas piezas de software perjudicial, conocidas como\u00a0<em>malware<\/em>.<\/p>\n\n\n\n<h2 id=\"h-para-que-sirve-un-firewall\" class=\"wp-block-heading\">\u00bfPara qu\u00e9 sirve un firewall?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Un firewall sirve, dicho sencillamente, para interrumpir las conexiones no autorizadas o sospechosas entre un sistema inform\u00e1tico o computador, e Internet. De esta manera se corta la comunicaci\u00f3n remota entre usuarios malintencionados (<em>hackers<\/em>) y el sistema local, o entre piezas de malware instaladas furtivamente en el sistema y el exterior del mismo, impidi\u00e9ndole as\u00ed operar como punta de lanza en la invasi\u00f3n cibern\u00e9tica.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Se trata, pues, de <strong>un vigilante que impide la entrada o salida de comunicaciones no autorizadas o sospechosas<\/strong>, en base a criterios de discernimiento que se actualizan cada cierto tiempo.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00bfC\u00f3mo funciona un firewall?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Los cortafuegos distinguen entre las conexiones permitidas y las peligrosas o sospechosas, en base a diferentes procedimientos, tales como:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Pol\u00edticas de firewall.<\/strong> Empleando los n\u00fameros de IP y otros sistemas de identificaci\u00f3n,\u00a0el cortafuegos\u00a0suspende cualquier petici\u00f3n de comunicaci\u00f3n que no provenga de la red interna o del propio sistema, disfrazando detr\u00e1s de un IP propio el conjunto de los recursos internos, de modo que nadie pueda monitorearlos desde afuera.<\/li>\n\n\n\n<li><strong>Filtrado de contenido.<\/strong> A trav\u00e9s de un sistema de reglas de exclusi\u00f3n en el que el usuario puede tener la \u00faltima palabra, el firewall distingue entre los contenidos problem\u00e1ticos, sospechosos o inseguros, y aquellos que quedan a discrecionalidad del usuario. As\u00ed, se puede bloquear el acceso a <a href=\"https:\/\/ahoraeg.com\/tecnobits\/conceptode\/que-es-una-pagina-web\/\" type=\"post\" id=\"469\">p\u00e1ginas Web<\/a> o servidores enteros como precauci\u00f3n.<\/li>\n\n\n\n<li><strong>Servicios de\u00a0antimalware.<\/strong> Muchos firewall tienen incorporadas definiciones de virus y malware provistas por diversos programas defensivos, de modo de tambi\u00e9n ayudar a tener la expansi\u00f3n de estos programas perniciosos.<\/li>\n\n\n\n<li><strong>Servicios de\u00a0DPI.<\/strong> Se llama as\u00ed a los procedimientos de Inspecci\u00f3n Profunda de Paquetes (DPI por sus siglas en ingl\u00e9s: <em>Deep Packet Inspection<\/em>), que a\u00f1ade una segunda capa de seguridad al sistema, revisando el contenido profundo de los paquetes de informaci\u00f3n recibidos.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Tipos de firewall<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Existen los siguientes tipos de firewall:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Nivel de aplicaci\u00f3n de pasarela.\u00a0<\/strong>Aplica solamente para aplicaciones espec\u00edficas consideradas riesgosas, como servidores FTP o de intercambio libre de informaci\u00f3n entre usuarios (P2P). Suele ser muy eficaz, pero impone una merma en los recursos del sistema.<\/li>\n\n\n\n<li><strong>Circuito a nivel de pasarela.\u00a0<\/strong>Vigila el establecimiento de conexiones TCP o UDP a trav\u00e9s de sesiones de seguridad.<\/li>\n\n\n\n<li><strong>Cortafuegos de capa de red.\u00a0<\/strong>Opera en base a la inspecci\u00f3n de las direcciones IP y el intercambio de paquetes IP, empleando para ello datos alternos como la direcci\u00f3n MAC.<\/li>\n\n\n\n<li><strong>Cortafuegos de capa de aplicaci\u00f3n.<\/strong> Opera ya en base a las aplicaciones, controlando su manera de alcanzar la Internet, por ejemplo, mediante Proxys.<\/li>\n\n\n\n<li><strong>Cortafuegos personal.\u00a0<\/strong>Cortafuegos elegidos por el usuario e instalados en el sistema para atender a los requerimientos individuales de uso del sistema.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Firewall de Windows<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">El c\u00e9lebre <a href=\"https:\/\/ahoraeg.com\/tecnobits\/conceptode\/que-es-el-sistema-operativo\/\" type=\"post\" id=\"335\">sistema operativo<\/a> de Microsoft, llamado Windows, incluye un software cortafuegos entre sus opciones de defensa autom\u00e1tica. Esta opci\u00f3n fue incluida en el Centro de Seguridad del sistema<strong> a partir de su versi\u00f3n XP\u00a0Service\u00a0Pack 2<\/strong>, buscando ofrecer un mayor control y defensa de la estabilidad del sistema para sus usuarios.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Este\u00a0cortafuegos\u00a0se actualiza junto con las otras aplicaciones de Windows para estar al d\u00eda en materia de\u00a0ciberamenazas, y <strong>se activa autom\u00e1ticamente<\/strong> a menos que haya alg\u00fan otro software antivirus o firewall que posea los privilegios de administraci\u00f3n de la conexi\u00f3n, en cuyo caso el firewall de Windows permanecer\u00e1 desactivado.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Te explicamos qu\u00e9 es un firewall, para qu\u00e9 sirve y c\u00f3mo funciona este sistema. Adem\u00e1s, los tipos que existen y el firewall de Windows.<\/p>\n","protected":false},"author":1,"featured_media":511,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[],"tmauthors":[8],"class_list":["post-510","post","type-post","status-publish","format-standard","has-post-thumbnail","category-conceptode"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.7 (Yoast SEO v27.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>\u00bfQu\u00e9 es\u00a0un\u00a0firewall? Tipos de firewall y c\u00f3mo funciona<\/title>\n<meta name=\"description\" content=\"Te explicamos qu\u00e9 es un firewall, para qu\u00e9 sirve y c\u00f3mo funciona este sistema. 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