{"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":"2023-01-06T09:24:06","modified_gmt":"2023-01-06T02:24:06","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":"<h4>I. H\u01b0\u1edbng d\u1eabn c\u00e0i \u0111\u0103t:<\/h4>\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<h4>II. H\u01b0\u1edbng d\u1eabn k\u00edch ho\u1ea1t UFW tr\u00ean server:<\/h4>\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<h4>III. H\u01b0\u1edbng d\u1eabn c\u1ea5u h\u00ecnh UFW:<\/h4>\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>\nV\u00ed d\u1ee5: \u0111\u1ec3 cho ph\u00e9p truy c\u1eadp t\u1eeb b\u00ean ngo\u00e0i\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>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 v27.4 - 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=\"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 - Long V\u00e2n\" \/>\n<meta property=\"og:description\" content=\"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. 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