{"id":1563,"date":"2025-05-06T06:43:48","date_gmt":"2025-05-06T06:43:48","guid":{"rendered":"https:\/\/sintesi.inscastellbisbal.net\/offtube\/?p=1563"},"modified":"2025-05-06T06:45:58","modified_gmt":"2025-05-06T06:45:58","slug":"dm","status":"publish","type":"post","link":"https:\/\/sintesi.inscastellbisbal.net\/offtube\/2025\/05\/06\/dm\/","title":{"rendered":"DMZ i LAN"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1563\" class=\"elementor elementor-1563\">\n\t\t\t\t<div class=\"elementor-element elementor-element-884d8e0 e-flex e-con-boxed e-con e-parent\" data-id=\"884d8e0\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e7453d8 elementor-widget elementor-widget-image\" data-id=\"e7453d8\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"784\" height=\"667\" src=\"https:\/\/sintesi.inscastellbisbal.net\/offtube\/wp-content\/uploads\/sites\/11\/2025\/05\/imagen.png\" class=\"attachment-large size-large wp-image-1564\" alt=\"\" srcset=\"https:\/\/sintesi.inscastellbisbal.net\/offtube\/wp-content\/uploads\/sites\/11\/2025\/05\/imagen.png 784w, https:\/\/sintesi.inscastellbisbal.net\/offtube\/wp-content\/uploads\/sites\/11\/2025\/05\/imagen-300x255.png 300w, https:\/\/sintesi.inscastellbisbal.net\/offtube\/wp-content\/uploads\/sites\/11\/2025\/05\/imagen-768x653.png 768w, https:\/\/sintesi.inscastellbisbal.net\/offtube\/wp-content\/uploads\/sites\/11\/2025\/05\/imagen-600x510.png 600w\" sizes=\"(max-width: 784px) 100vw, 784px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ff48524 e-con-full e-flex e-con e-parent\" data-id=\"ff48524\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3769cc2 elementor-widget elementor-widget-text-editor\" data-id=\"3769cc2\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"traductor-textarea form-group\"><div class=\"textarea-desti col-xs-12 col-sm-6\"><h4 class=\"form-control second-textarea\"><img decoding=\"async\" class=\"emoji\" role=\"img\" draggable=\"false\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/svg\/1f539.svg\" alt=\"\ud83d\udd39\" \/> Secci\u00f3 de Filtrat (filter)<br \/>Aquesta part gestiona les regles de control de tr\u00e0nsit en les cadenes INPUT, FORWARD i OUTPUT, que regulen quins paquets poden entrar, sortir o ser reexpedits a trav\u00e9s del firewall.<\/h4><h4 class=\"form-control second-textarea\"><br \/><img decoding=\"async\" class=\"emoji\" role=\"img\" draggable=\"false\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/svg\/31-20e3.svg\" alt=\"1\ufe0f\u20e3\" \/> Pol\u00edtiques per Defecte<br \/>: INPUT ACCEPT \u2192 Accepta tot el tr\u00e0nsit entrant. Aix\u00f2 significa que qualsevol paquet que no coincideixi amb una regla espec\u00edfica ser\u00e0 acceptat.<br \/>: FORWARD ACCEPT\u2192 Accepta tot el tr\u00e0nsit de reexpedici\u00f3 entre interf\u00edcies de xarxa.<br \/>: OUTPUT ACCEPT \u2192 Permet tot el tr\u00e0nsit sortint sense restriccions.<\/h4><h4 class=\"form-control second-textarea\"><br \/><br \/><img decoding=\"async\" class=\"emoji\" role=\"img\" draggable=\"false\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/svg\/32-20e3.svg\" alt=\"2\ufe0f\u20e3\" \/> Regles d&#8217;Entrada (INPUT)<br \/>Aquestes regles controlen el tr\u00e0nsit entrant cap al dispositiu (encaminador). Vegem algunes espec\u00edfiques:<\/h4><h4 class=\"form-control second-textarea\">-A INPUT -i ho -j ACCEPT\u2192 Permet tot el tr\u00e0nsit en la interf\u00edcie de loopback (el), necess\u00e0ria per al funcionament local del sistema.<br \/>-A INPUT -p tcp -m tcp &#8211;dport 21 -j ACCEPT \u2192 Permet tr\u00e0nsit FTP en el port 21.<br \/>-A INPUT -p tcp -m tcp &#8211;dport 20 -j ACCEPT\u2192 Permet tr\u00e0nsit FTP-DATA en el port 20.<br \/>-A INPUT -p tcp -m tcp &#8211;dport 1024:1048 -j ACCEPT \u2192 Permet connexions en els ports din\u00e0mics 1024-1048.<\/h4><h4 class=\"form-control second-textarea\"><br \/><br \/><img decoding=\"async\" class=\"emoji\" role=\"img\" draggable=\"false\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/svg\/33-20e3.svg\" alt=\"3\ufe0f\u20e3\" \/> Regles de Reexpedici\u00f3 (FORWARD)<br \/>Aqu\u00ed es configura el tr\u00e0nsit que passa a trav\u00e9s de l&#8217;encaminador, \u00e9s a dir, els paquets que s&#8217;envien entre interf\u00edcies de xarxa:<\/h4><h4 class=\"form-control second-textarea\"><br \/>-A FORWARD -i enp1s0.10 -o enp1s0.20 -j ACCEPT \u2192 Permet tr\u00e0nsit entre les subxarxes enp1s0.10 i enp1s0.20.<br \/>-A FORWARD -i enp1s0 -o enp2s0 -j ACCEPT \u2192 Permet tr\u00e0nsit des de enp1s0 a enp2s0 (probablement la interf\u00edcie de sortida a Internet).<br \/>-A FORWARD -i enp2s0 -o enp1s0 -m state &#8211;state RELATED,ESTABLISHED -j ACCEPT \u2192 Permet paquets de resposta des d&#8217;Internet cap a la xarxa interna, assegurant que nom\u00e9s siguin connexions iniciades des de dins.<br \/>-A FORWARD -i enp2s0 -o enp1s0 -j REJECT &#8211;reject-*with icmp-*port-*unreachable \u2192 Bloqueja tot tr\u00e0nsit no autoritzat des d&#8217;Internet cap a la xarxa interna.<\/h4><h4 class=\"form-control second-textarea\"><br \/><img decoding=\"async\" class=\"emoji\" role=\"img\" draggable=\"false\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/svg\/1f4cc.svg\" alt=\"\ud83d\udccc\" \/> L&#8217;important aqu\u00ed:\u00a0\u00a0<br \/><img decoding=\"async\" class=\"emoji\" role=\"img\" draggable=\"false\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/svg\/2714.svg\" alt=\"\u2714\" \/> Es protegeix la xarxa interna en permetre sol tr\u00e0nsit de retorn.\u00a0\u00a0<br \/><img decoding=\"async\" class=\"emoji\" role=\"img\" draggable=\"false\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/svg\/2714.svg\" alt=\"\u2714\" \/> Les regles permeten comunicaci\u00f3 entre les VLANs (enp1s0.10, enp1s0.20, enp1s0.30).\u00a0\u00a0<br \/><img decoding=\"async\" class=\"emoji\" role=\"img\" draggable=\"false\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/svg\/2714.svg\" alt=\"\u2714\" \/> Es bloqueja acc\u00e9s directe des d&#8217;Internet a la xarxa interna, la qual cosa \u00e9s una bona pr\u00e0ctica de seguretat.<\/h4><h4 class=\"form-control second-textarea\"><br \/><img decoding=\"async\" class=\"emoji\" role=\"img\" draggable=\"false\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/svg\/34-20e3.svg\" alt=\"4\ufe0f\u20e3\" \/> Regles de Sortida (OUTPUT)<br \/>-A OUTPUT -o ho -j ACCEPT \u2192 Permet tr\u00e0nsit en la interf\u00edcie el, que \u00e9s important per a processos interns del sistema.<\/h4><p>\u00a0<\/p><h4>\u00a0<img decoding=\"async\" class=\"emoji\" role=\"img\" draggable=\"false\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/svg\/1f539.svg\" alt=\"\ud83d\udd39\" \/> Secci\u00f3 de NAT (nat)<br \/>Aquesta part configura la traducci\u00f3 d&#8217;adreces de xarxa, necess\u00e0ria perqu\u00e8 els dispositius interns accedeixin a Internet.<\/h4><h4><br \/><img decoding=\"async\" class=\"emoji\" role=\"img\" draggable=\"false\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/svg\/31-20e3.svg\" alt=\"1\ufe0f\u20e3\" \/> Regla de MASQUERADE<br \/>-A POSTROUTING -o enp2s0 -j MASQUERADE<\/h4><h4><br \/><img decoding=\"async\" class=\"emoji\" role=\"img\" draggable=\"false\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/svg\/1f4a1.svg\" alt=\"\ud83d\udca1\" \/> Qu\u00e8 fa aquesta regla?\u00a0\u00a0<br \/>Aquesta regla oculta les adreces IP privades dels dispositius interns i les reempla\u00e7a amb la IP p\u00fablica de l&#8217;encaminador quan salin per enp2s0. \u00c9s essencial per a permetre la navegaci\u00f3 en \u00a1nternet.<\/h4><h4><br \/>\u00a0<img decoding=\"async\" class=\"emoji\" role=\"img\" draggable=\"false\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/svg\/1f539.svg\" alt=\"\ud83d\udd39\" \/> Resum de Funcionament<br \/><img decoding=\"async\" class=\"emoji\" role=\"img\" draggable=\"false\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/svg\/2705.svg\" alt=\"\u2705\" \/> Filtrat de tr\u00e0nsit: Es permet tr\u00e0nsit essencial en la xarxa interna i es bloquegen accessos directes des d&#8217;Internet.\u00a0\u00a0<br \/><img decoding=\"async\" class=\"emoji\" role=\"img\" draggable=\"false\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/svg\/2705.svg\" alt=\"\u2705\" \/> Comunicaci\u00f3 entre VLANs: Es permet el tr\u00e0nsit entre les diferents subxarxes internes (enp1s0.10, enp1s0.20, enp1s0.30).\u00a0\u00a0<br \/><img decoding=\"async\" class=\"emoji\" role=\"img\" draggable=\"false\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/svg\/2705.svg\" alt=\"\u2705\" \/> Protecci\u00f3 de l&#8217;encaminador: Es permet sol tr\u00e0nsit de retorn des d&#8217;Internet i es bloqueja acc\u00e9s directe a la xarxa interna.\u00a0\u00a0<br \/><img decoding=\"async\" class=\"emoji\" role=\"img\" draggable=\"false\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/svg\/2705.svg\" alt=\"\u2705\" \/> Traducci\u00f3 de direccions (NAT): S&#8217;usa MASQUERADE per a permetre que els dispositius interns naveguin per Internet.<\/h4><\/div><\/div><div class=\"traductor-checkbox form-group\"><div class=\"row\">\u00a0<\/div><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Secci\u00f3 de Filtrat (filter)Aquesta part gestiona les regles de control de tr\u00e0nsit en les cadenes INPUT, FORWARD i OUTPUT, que regulen quins paquets poden entrar, sortir o ser reexpedits a trav\u00e9s del firewall. Pol\u00edtiques per Defecte: INPUT ACCEPT \u2192 Accepta tot el tr\u00e0nsit entrant. Aix\u00f2 significa que qualsevol paquet que no coincideixi amb una regla &#8230; <a title=\"DMZ i LAN\" class=\"read-more\" href=\"https:\/\/sintesi.inscastellbisbal.net\/offtube\/2025\/05\/06\/dm\/\" aria-label=\"Read more about DMZ i LAN\">Read more<\/a><\/p>\n","protected":false},"author":33,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1563","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>DMZ i LAN - S\u00cdNTESI 25 | OFFTUBE<\/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:\/\/sintesi.inscastellbisbal.net\/offtube\/2025\/05\/06\/dm\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DMZ i LAN - S\u00cdNTESI 25 | OFFTUBE\" \/>\n<meta property=\"og:description\" content=\"Secci\u00f3 de Filtrat (filter)Aquesta part gestiona les regles de control de tr\u00e0nsit en les cadenes INPUT, FORWARD i OUTPUT, que regulen quins paquets poden entrar, sortir o ser reexpedits a trav\u00e9s del firewall. Pol\u00edtiques per Defecte: INPUT ACCEPT \u2192 Accepta tot el tr\u00e0nsit entrant. Aix\u00f2 significa que qualsevol paquet que no coincideixi amb una regla ... 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