{"id":1797,"date":"2023-01-06T09:24:06","date_gmt":"2023-01-06T02:24:06","guid":{"rendered":"https:\/\/longvan.net\/cong-dong\/?p=1797"},"modified":"2026-11-04T14:27:43","modified_gmt":"2026-11-04T07:27:43","slug":"huong-dan-cai-dat-cau-hinh-ufw","status":"publish","type":"post","link":"https:\/\/longvan.net\/cong-dong\/huong-dan-cai-dat-cau-hinh-ufw\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn c\u00e0i \u0111\u1eb7t c\u1ea5u h\u00ecnh UFW tr\u00ean Ubuntu"},"content":{"rendered":"<h2>I. H\u01b0\u1edbng d\u1eabn c\u00e0i \u0111\u0103t<\/h2>\n<p>Th\u00f4ng th\u01b0\u1eddng ufw s\u1ebd \u0111\u01b0\u1ee3c c\u00e0i \u0111\u1eb7t m\u1eb7c \u0111\u1ecbnh tr\u00ean h\u1ec7 \u0111i\u1ec1u h\u00e0nh Ubuntu. Th\u1ef1c hi\u1ec7n l\u1ec7nh sau \u0111\u1ec3 ki\u1ec3m tra:<\/p>\n<pre># ufw version<\/pre>\n<p>Trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p, n\u1ebfu ch\u01b0a c\u00f3 ufw, Qu\u00fd kh\u00e1ch c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n theo c\u00e1c thao t\u00e1c d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n<ol>\n<li><strong>B\u01b0\u1edbc 1<\/strong>: Truy c\u1eadp \u0111\u1ebfn server v\u00e0 c\u1eadp nh\u1eadt h\u1ec7 th\u1ed1ng v\u00e0 ki\u1ec3m tra c\u00e0i \u0111\u1eb7t\n<pre class=\"body\"># sudo apt update\n# sudo apt upgrade<\/pre>\n<\/li>\n<li><strong>B\u01b0\u1edbc 2<\/strong>: C\u00e0i \u0111\u1eb7t ufw\n<ul>\n<li>Ch\u1ea1y l\u1ec7nh c\u00e0i \u0111\u0103t ufw\n<pre class=\"body\"># sudo apt-get install ufw\n<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1798 aligncenter\" src=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/a-e1672908422372.png\" alt=\"\" width=\"600\" height=\"219\" srcset=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/a-e1672908422372.png 705w, https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/a-e1672908422372-300x109.png 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li class=\"body\"><strong style=\"font-size: revert;color: initial\">B\u01b0\u1edbc 3<\/strong><span style=\"font-size: revert;color: initial\">: Ki\u1ec3m tra ho\u1ea1t \u0111\u1ed9ng<\/span>\n<ul>\n<li class=\"body\">N\u1ebfu k\u1ebft qu\u1ea3 ki\u1ec3m tra ok th\u00ec qu\u00e1 tr\u00ecnh c\u00e0i \u0111\u1eb7t ufw \u0111\u00e3 ho\u00e0n th\u00e0nh.<br \/><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1799 size-full aligncenter\" src=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/b-e1672908486894.png\" alt=\"\" width=\"459\" height=\"49\" srcset=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/b-e1672908486894.png 459w, https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/b-e1672908486894-300x32.png 300w\" sizes=\"auto, (max-width: 459px) 100vw, 459px\" \/><\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h2>II. H\u01b0\u1edbng d\u1eabn k\u00edch ho\u1ea1t UFW tr\u00ean server<\/h2>\n<ul>\n<li>K\u00edch ho\u1ea1t UFW sau khi c\u00e0i \u0111\u1eb7t<strong><strong><br \/><\/strong><\/strong>\n<pre class=\"body\"># sudo ufw enable<\/pre>\n<\/li>\n<li>Ki\u1ec3m tra khi k\u00edch ho\u1ea1t UFW\n<pre class=\"body\"># sudo ufw status<\/pre>\n<\/li>\n<li>Kh\u00f4i ph\u1ee5c firewall UFW v\u1ec1 c\u1ea5u h\u00ecnh m\u1eb7c \u0111\u1ecbnh\n<pre class=\"body\"># sudo ufw reset<\/pre>\n<h4><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1801 aligncenter\" src=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/v-e1672908673511.png\" alt=\"\" width=\"600\" height=\"351\" srcset=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/v-e1672908673511.png 614w, https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/v-e1672908673511-300x175.png 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/h4>\n<\/li>\n<\/ul>\n<h2>III. H\u01b0\u1edbng d\u1eabn c\u1ea5u h\u00ecnh UFW<\/h2>\n<ol>\n<li>C\u1ea5u h\u00ecnh rule m\u1eb7c \u0111\u1ecbnh:\n<ul>\n<li>S\u1eed d\u1ee5ng l\u1ec7nh <code>sudo ufw status verbose<\/code> \u0111\u1ec3 ki\u1ec3m tra c\u1ea5u h\u00ecnh firewall m\u1eb7c \u0111\u1ecbnh. Bao g\u1ed3m: <br \/><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1843 size-full aligncenter\" src=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2023\/01\/ufw.png\" alt=\"\" width=\"443\" height=\"133\" srcset=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2023\/01\/ufw.png 443w, https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2023\/01\/ufw-300x90.png 300w\" sizes=\"auto, (max-width: 443px) 100vw, 443px\" \/>\n<ul>\n<li>Ch\u1eb7n to\u00e0n b\u1ed9 k\u1ebft n\u1ed1i \u0111\u1ebfn : deny (incoming)<\/li>\n<li>Cho ph\u00e9p truy c\u1eadp ra b\u00ean ngo\u00e0i : allow (outgoing)<\/li>\n<li>Ch\u1eb7n c\u1ea5u h\u00ecnh routed: disable (routed)<\/li>\n<\/ul>\n<\/li>\n<li>\u0110\u1ec3 \u0111i\u1ec1u ch\u1ec9nh c\u1ea5u h\u00ecnh c\u1ea5u h\u00ecnh m\u1eb7c \u0111\u1ecbnh, th\u1ef1c hi\u1ec7n l\u1ec7nh sau:\n<pre># sudo ufw default [policy] [chain]<\/pre>\n<p>V\u00ed d\u1ee5: \u0111\u1ec3 cho ph\u00e9p truy c\u1eadp t\u1eeb b\u00ean ngo\u00e0i<\/p>\n<pre># sudo ufw default allow incoming<\/pre>\n<\/li>\n<\/ul>\n<\/li>\n<li>Cho ph\u00e9p c\u00e1c port c\u1ea7n truy c\u1eadp v\u00e0o server\n<ul>\n<li>M\u1eb7c \u0111\u1ecbnh firewall ufw s\u1ebd ch\u1eb7n to\u00e0n b\u1ed9 k\u1ebft n\u1ed1i \u0111\u1ebfn server.<\/li>\n<li>\u0110\u1ec3 th\u1ef1c hi\u1ec7n m\u1edf m\u1ed9t port (c\u1ed5ng) b\u1ea5t k\u1ef3 b\u1ea1n c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n c\u00fa ph\u00e1p l\u1ec7nh nh\u01b0 sau:\n<pre class=\"wp-block-preformatted\"># sudo ufw allow [port]\/[protocol]<\/pre>\n<p>V\u00ed d\u1ee5 : m\u1edf c\u00e1c port 80, 443, 3306 v\u00e0 8080<br \/><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1802 size-full aligncenter\" src=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/n-e1672909477209.png\" alt=\"\" width=\"509\" height=\"249\" srcset=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/n-e1672909477209.png 509w, https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/n-e1672909477209-300x147.png 300w\" sizes=\"auto, (max-width: 509px) 100vw, 509px\" \/><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>Ch\u1eb7n truy c\u1eadp \u0111\u1ebfn m\u1ed9t port.\n<ul>\n<li>C\u00e1c port kh\u00f4ng \u0111\u01b0\u1ee3c allow s\u1ebd t\u1ef1 \u0111\u1ed9ng ch\u1eb7n k\u1ebft n\u1ed1i t\u1eeb b\u00ean ngo\u00e0i.<\/li>\n<li>Ngo\u00e0i ra, \u0111\u1ec3 ch\u1eb7n m\u1ed9t port c\u1ee5 th\u1ec3 c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00fa ph\u00e1p v\u1edbi t\u00f9y ch\u1ecdn <code>deny<\/code> nh\u01b0 sau:\n<pre class=\"wp-block-preformatted\"># sudo ufw deny [port]\/[protocol]<\/pre>\n<p>V\u00ed d\u1ee5 : m\u00ecnh s\u1ebd \u0111\u00f3ng port 80, 443<br \/><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1803 aligncenter\" src=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/m.png\" alt=\"\" width=\"424\" height=\"129\" srcset=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/m.png 424w, https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/m-300x91.png 300w\" sizes=\"auto, (max-width: 424px) 100vw, 424px\" \/><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>Ngo\u00e0i ra ufw cho ph\u00e9p th\u1ef1c hi\u1ec7n l\u1ec7nh allow v\u00e0 deny v\u1edbi lo\u1ea1i service c\u1ee5 th\u1ec3. V\u00ed d\u1ee5: s\u1eed d\u1ee5ng mysql thay v\u00ec m\u1edfi port 3306, s\u1eed d\u1ee5ng http hay https thay v\u00ec c\u00e1c port 80, 443, c\u1ee5 th\u1ec3:<\/p>\n<pre># sudo ufw deny mysql<br \/># sudo ufw allow http<br \/># sudo ufw allow https<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1804 size-full aligncenter\" src=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/s-e1672910871158.png\" alt=\"\" width=\"449\" height=\"157\" srcset=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/s-e1672910871158.png 449w, https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/s-e1672910871158-300x105.png 300w\" sizes=\"auto, (max-width: 449px) 100vw, 449px\" \/><\/p>\n<\/li>\n<li>Cho ph\u00e9p m\u00f4t IP ho\u1eb7c m\u1ed9t range IP truy c\u1eadp \u0111\u1ebfn server.\n<ul>\n<li>Cho ph\u00e9p m\u1ed9t truy c\u1eadp\n<pre class=\"wp-block-preformatted\"># sudo ufw allow from $Your_IP<\/pre>\n<p>V\u00ed d\u1ee5:\u00a0 cho ph\u00e9p, m\u1edf IP 172.20.1.125 tr\u00ean ufw nh\u01b0 sau.<\/p>\n<pre class=\"body\"># sudo ufw allow from 172.20.1.125<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1808 aligncenter\" src=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/h-e1672971657812.png\" alt=\"\" width=\"440\" height=\"69\" srcset=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/h-e1672971657812.png 453w, https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/h-e1672971657812-300x47.png 300w\" sizes=\"auto, (max-width: 440px) 100vw, 440px\" \/><\/p>\n<\/li>\n<li>Ch\u1eb7n truy c\u1eadp t\u1eeb m\u1ed9t IP\n<pre><span style=\"white-space: pre-wrap\">sudo ufw deny from $Your_IP<br \/><\/span><\/pre>\n<p><span style=\"white-space: pre-wrap\">V\u00ed d\u1ee5:\u00a0 ch\u1eb7n truy c\u1eadp t\u1eeb IP 172.20.1.126 nh\u01b0 sau.<br \/><\/span><\/p>\n<pre><span style=\"white-space: pre-wrap\">sudo ufw deny from 172.20.1.126<\/span><\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1809 aligncenter\" src=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/j-e1672971678825.png\" alt=\"\" width=\"440\" height=\"62\" srcset=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/j-e1672971678825.png 439w, https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/j-e1672971678825-300x42.png 300w\" sizes=\"auto, (max-width: 440px) 100vw, 440px\" \/><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>Cho ph\u00e9p IP k\u00e8m port nh\u1ea5t \u0111\u1ecbnh v\u00e0o server<\/p>\n<ul>\n<li>L\u1ec7nh cho ph\u00e9p m\u1ed9t IP ho\u1eb7c m\u1ed9t range IP truy c\u1eadp \u0111\u1ebfn m\u1ed9t Port c\u1ee5 th\u1ec3 tr\u00ean server:<\/li>\n<li>C\u00fa ph\u00e1p:\n<pre>sudo ufw allow from [ip\/range-ip] to any port [port-number]<\/pre>\n<\/li>\n<li><span style=\"white-space: normal\">V\u00ed d\u1ee5: c\u00e2u l\u1ec7nh cho ph\u00e9p IP 192.168.72.1 truy c\u1eadp \u0111\u1ebfn port 22 v\u00e0 3306<\/span><span style=\"white-space: normal\"><br \/><\/span>\n<pre>sudo ufw allow from 192.168.72.1 to any port 22<br \/>sudo ufw allow from 192.168.72.1 to any port 3306<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1805 aligncenter\" src=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/d-e1672911213257.png\" alt=\"\" width=\"500\" height=\"84\" \/><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>X\u00f3a b\u1ecf rule firewall c\u1ea5u h\u00ecnh tr\u01b0\u1edbc \u0111\u00f3.\n<ul>\n<li>Ki\u1ec3m tra c\u00e1c rule hi\u1ec7n c\u00f3 v\u1edbi s\u1ed1 \u0111\u1ecbnh danh. L\u1ec7nh:\n<pre>sudo ufw status numbered<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1806 aligncenter\" src=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/f-e1672913005882.png\" alt=\"\" width=\"420\" height=\"333\" srcset=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/f-e1672913005882.png 444w, https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/f-e1672913005882-300x238.png 300w\" sizes=\"auto, (max-width: 420px) 100vw, 420px\" \/><\/p>\n<\/li>\n<li>X\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c rule mu\u1ed1n x\u00f3a v\u1edbi s\u1ed1 \u0111\u1ecbnh danh t\u01b0\u01a1ng \u1ee9ng<\/li>\n<li>Th\u1ef1c hi\u1ec7n l\u1ec7nh x\u00f3a rule v\u1edbi l\u1ec7nh:\n<pre>sudo ufw delele [number]<\/pre>\n<p>V\u00ed d\u1ee5: th\u1ef1c hi\u1ec7n x\u00f3a rule cho ph\u00e9p truy c\u1eadp \u0111\u1ebfn port SSH (22) v\u1edbi l\u1ec7nh<\/p>\n<pre>sudo ufw delete 7<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1807 aligncenter\" src=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/g-e1672913066911.png\" alt=\"\" width=\"430\" height=\"394\" srcset=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/g-e1672913066911.png 437w, https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/g-e1672913066911-300x275.png 300w\" sizes=\"auto, (max-width: 430px) 100vw, 430px\" \/><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>B\u1eadt ho\u1eb7c t\u1eaft ipv6 tr\u00ean firewal UFW<\/p>\n<ul>\n<li>Trong tr\u01b0\u1eddng h\u1ee3p server s\u1eed d\u1ee5ng IPv6, c\u1ea7n \u0111\u1ea3m b\u1ea3o r\u1eb1ng IPv6 \u0111\u01b0\u1ee3c b\u1eadt trong UFW.\u00a0<\/li>\n<li>M\u1edf file c\u1ea5u h\u00ecnh UFW \u1edf \/etc\/default\/ufw v\u00e0 ti\u1ebfn h\u00e0nh \u0111i\u1ec1u ch\u1ec9nh.\n<p>N\u1ebfu d\u00f2ng\u00a0<code>IPV6=no<\/code>\u00a0b\u1ea1n h\u00e3y chuy\u1ec3n sang\u00a0<code>YES<\/code> \u0111\u1ec3 k\u00edch ho\u1ea1t v\u00e0 ng\u01b0\u1ee3c l\u1ea1i n\u1ebfu mu\u1ed1n t\u1eaft th\u00ec ch\u1ecdn no.<br \/><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1812 aligncenter\" src=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/k-e1672969255449.png\" alt=\"\" width=\"500\" height=\"475\" srcset=\"https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/k-e1672969255449.png 563w, https:\/\/longvan.net\/cong-dong\/wp-content\/uploads\/2022\/12\/k-e1672969255449-300x285.png 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<\/li>\n<li>Sau c\u00f9ng s\u1eed d\u1ee5ng l\u1ec7nh sau \u0111\u1ec3 reload l\u1ea1i c\u1ea5u h\u00ecnh\n<pre># sudo ufw reload<\/pre>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n<p class=\"wp-block-paragraph\">Nh\u01b0 v\u1eady, Long V\u00e2n \u0111\u00e3 ho\u00e0n th\u00e0nh h\u01b0\u1edbng d\u1eabn Qu\u00fd kh\u00e1ch c\u00e1ch c\u00e0i \u0111\u1eb7t v\u00e0 c\u1ea5u h\u00ecnh firewall UFW, ch\u00fac Qu\u00fd kh\u00e1ch th\u00e0nh c\u00f4ng !<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I. H\u01b0\u1edbng d\u1eabn c\u00e0i \u0111\u0103t Th\u00f4ng th\u01b0\u1eddng ufw s\u1ebd \u0111\u01b0\u1ee3c c\u00e0i \u0111\u1eb7t m\u1eb7c \u0111\u1ecbnh tr\u00ean h\u1ec7 \u0111i\u1ec1u h\u00e0nh Ubuntu. Th\u1ef1c hi\u1ec7n l\u1ec7nh sau \u0111\u1ec3 ki\u1ec3m tra: # ufw version Trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p, n\u1ebfu ch\u01b0a c\u00f3 ufw, Qu\u00fd kh\u00e1ch c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n theo c\u00e1c thao t\u00e1c d\u01b0\u1edbi \u0111\u00e2y. B\u01b0\u1edbc 1: Truy c\u1eadp \u0111\u1ebfn [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_oasis_is_in_workflow":0,"_oasis_original":0,"footnotes":""},"categories":[4],"tags":[73,75,71,74,38,5,72,148,76],"class_list":["post-1797","post","type-post","status-publish","format-standard","hentry","category-linux","tag-allow-access","tag-blacklist","tag-csf","tag-deny-access","tag-firewall","tag-linux","tag-linux-firewall","tag-ubuntu","tag-whitelist"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>H\u01b0\u1edbng d\u1eabn c\u00e0i \u0111\u1eb7t c\u1ea5u h\u00ecnh UFW tr\u00ean Ubuntu - Long V\u00e2n<\/title>\n<meta name=\"description\" content=\"H\u01b0\u1edbng d\u1eabn chi ti\u1ebft c\u00e1ch c\u00e0i \u0111\u1eb7t v\u00e0 c\u1ea5u h\u00ecnh t\u01b0\u1eddng l\u1eeda UFW (Uncomplicated Firewall) tr\u00ean m\u00e1y ch\u1ee7 Linux gi\u00fap b\u1ea3o m\u1eadt server an to\u00e0n, hi\u1ec7u qu\u1ea3 t\u1eeb chuy\u00ean gia Long V\u00e2n.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/longvan.net\/cong-dong\/huong-dan-cai-dat-cau-hinh-ufw\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"H\u01b0\u1edbng d\u1eabn c\u00e0i \u0111\u1eb7t c\u1ea5u h\u00ecnh UFW tr\u00ean Ubuntu - 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