{"id":570,"date":"2018-07-02T10:57:20","date_gmt":"2018-07-02T03:57:20","guid":{"rendered":"https:\/\/lagonet.vn\/?p=570"},"modified":"2018-07-02T10:57:20","modified_gmt":"2018-07-02T03:57:20","slug":"statefull-firewall","status":"publish","type":"post","link":"https:\/\/kb.lagonet.vn\/?p=570","title":{"rendered":"STATEFULL FIREWALL"},"content":{"rendered":"<p>Stateful firewall ch\u1ec9 ra m\u1ed9t lo\u1ea1i firewall c\u00f3 kh\u1ea3 n\u0103ng duy tr\u00ec c\u00e1c th\u00f4ng tin v\u1ec1 c\u00e1c k\u1ebft n\u1ed1i \u0111ang \u0111i xuy\u00ean qua n\u00f3. Lo\u1ea1i fw n\u00e0y c\u00f3 th\u1ec3 cho ph\u00e9p ho\u1eb7c lo\u1ea1i b\u1ecf c\u00e1c g\u00f3i tin d\u1ef1a v\u00e0o g\u00f3i tin tr\u01b0\u1edbc \u0111\u00f3 trong m\u1ed9t d\u00f2ng d\u1eef li\u1ec7u ho\u1eb7c trong m\u1ed9t k\u1ebft n\u1ed1i. K\u1ef9 thu\u1eadt n\u00e0y c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 l\u1ecdc g\u00f3i tin \u0111\u1ed9ng (dynamic packet filtering).<br \/>\nK\u1ef9 thu\u1eadt n\u00e0y th\u00ec \u00edt ph\u1ee9c t\u1ea1p h\u01a1n, tuy nhi\u00ean l\u1ea1i m\u1ea1nh h\u01a1n ki\u1ec3u l\u1ecdc g\u00f3i tin th\u00f4ng th\u01b0\u1eddng (v\u00ed d\u1ee5 nh\u01b0 d\u00f9ng ACL).<\/p>\n<p>Ch\u1ee9c n\u0103ng n\u00e0y gi\u00fap cho router c\u00f3 nhi\u1ec1u t\u00ednh n\u0103ng b\u1ea3o m\u1eadt h\u01a1n, v\u00ec b\u00ecnh th\u01b0\u1eddng, c\u00e1c router kh\u00f4ng c\u00f3 duy tr\u00ec c\u00e1c th\u00f4ng tin tr\u1ea1ng th\u00e1i. Ngh\u0129a l\u00e0, router ki\u1ec3m tra t\u1eebng g\u00f3i tin \u0111i qua n\u00f3 m\u1ed9t c\u00e1ch ri\u00eang l\u1ebb m\u00e0 kh\u00f4ng c\u00f3 tham kh\u1ea3o \u0111\u1ebfn c\u00e1c g\u00f3i tin \u0111\u00e3 t\u1ed3n t\u1ea1i tr\u01b0\u1edbc \u0111\u00f3.<\/p>\n<p>Stateful fw d\u00f9ng c\u00e1c b\u1ea3ng tr\u1ea1ng th\u00e1i \u0111\u1ec3 ph\u00e2n t\u00edch m\u1ed9t c\u00e1ch th\u00f4ng minh c\u00e1c g\u00f3i tin. V\u00ed d\u1ee5, m\u1ed9t ng\u01b0\u1eddi d\u00f9ng g\u1eedi ra m\u1ed9t g\u00f3i tin FTP request. FW s\u1ebd ph\u00e2n t\u00edch c\u00e1c c\u00e1c g\u00f3i tin FTP \u0111ang \u0111i v\u00e0o \u0111\u1ec3 ki\u1ec3m tra xem c\u00e1c g\u00f3i tin n\u00e0y c\u00f3 li\u00ean quan \u0111\u1ebfn g\u00f3i tin FTP request tr\u01b0\u1edbc \u0111\u00e2y hay kh\u00f4ng.<\/p>\n<p>Th\u00f4ng tin th\u00eam v\u1ec1 stateful firewall, b\u1ea1n tham kh\u1ea3o \u1edf \u0111\u00e2y:<br \/>\n<a href=\"http:\/\/en.wikipedia.org\/wiki\/Stateful_firewall\" target=\"_blank\" rel=\"noopener\">http:\/\/en.wikipedia.org\/wiki\/Stateful_firewall<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Stateful firewall ch\u1ec9 ra m\u1ed9t lo\u1ea1i firewall c\u00f3 kh\u1ea3 n\u0103ng duy tr\u00ec c\u00e1c th\u00f4ng tin v\u1ec1 c\u00e1c k\u1ebft n\u1ed1i \u0111ang [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[29,25,16,28,21,6],"tags":[],"class_list":["post-570","post","type-post","status-publish","format-standard","hentry","category-ccie-rs","category-cisco","category-courses","category-jncip","category-juniper","category-networking"],"_links":{"self":[{"href":"https:\/\/kb.lagonet.vn\/index.php?rest_route=\/wp\/v2\/posts\/570","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kb.lagonet.vn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kb.lagonet.vn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kb.lagonet.vn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kb.lagonet.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=570"}],"version-history":[{"count":0,"href":"https:\/\/kb.lagonet.vn\/index.php?rest_route=\/wp\/v2\/posts\/570\/revisions"}],"wp:attachment":[{"href":"https:\/\/kb.lagonet.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=570"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kb.lagonet.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=570"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kb.lagonet.vn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=570"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}