{"id":531,"date":"2026-07-06T06:36:01","date_gmt":"2026-07-06T06:36:01","guid":{"rendered":"https:\/\/rufreevpn.org\/"},"modified":"2026-07-06T06:36:01","modified_gmt":"2026-07-06T06:36:01","slug":"what-is-openvpn","status":"publish","type":"post","link":"https:\/\/rufreevpn.org\/vi\/post\/what-is-openvpn\/","title":{"rendered":"OpenVPN l\u00e0 g\u00ec? H\u01b0\u1edbng d\u1eabn \u0111\u1ea7y \u0111\u1ee7 v\u1ec1 Giao th\u1ee9c VPN ph\u1ed5 bi\u1ebfn"},"content":{"rendered":"<p class=\"wp-block-paragraph\">OpenVPN l\u00e0 giao th\u1ee9c VPN ngu\u1ed3n m\u1edf h\u00e0ng \u0111\u1ea7u v\u00e0 b\u1ed9 ph\u1ea7n m\u1ec1m m\u1ea1nh m\u1ebd \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 thi\u1ebft l\u1eadp c\u00e1c k\u1ebft n\u1ed1i \u0111i\u1ec3m-\u0111i\u1ec3m ho\u1eb7c \u0111i\u1ec3m-\u0111\u1ebfn-\u0111i\u1ec3m c\u1ef1c k\u1ef3 an to\u00e0n qua internet c\u00f4ng c\u1ed9ng. K\u1ec3 t\u1eeb khi ra m\u1eaft v\u00e0o n\u0103m 2001 b\u1edfi James Yonan, n\u00f3 \u0111\u00e3 ph\u00e1t tri\u1ec3n th\u00e0nh ti\u00eau chu\u1ea9n c\u00f4ng nghi\u1ec7p to\u00e0n c\u1ea7u, \u0111\u01b0\u1ee3c ca ng\u1ee3i v\u00ec kh\u1ea3 n\u0103ng xuy\u00ean qua c\u00e1c m\u1ea1ng ph\u1ee9c t\u1ea1p v\u00e0 v\u01b0\u1ee3t qua c\u00e1c t\u01b0\u1eddng l\u1eeda h\u1ea1n ch\u1ebf.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img alt=\"\" fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"501\" src=\"https:\/\/rufreevpn.org\/wp-content\/uploads\/2026\/07\/imgi_8_open-vpn-1024x501-1.png\" class=\"wp-image-532\" srcset=\"https:\/\/rufreevpn.org\/wp-content\/uploads\/2026\/07\/imgi_8_open-vpn-1024x501-1.png 1024w, https:\/\/rufreevpn.org\/wp-content\/uploads\/2026\/07\/imgi_8_open-vpn-1024x501-1-600x294.png 600w, https:\/\/rufreevpn.org\/wp-content\/uploads\/2026\/07\/imgi_8_open-vpn-1024x501-1-300x147.png 300w, https:\/\/rufreevpn.org\/wp-content\/uploads\/2026\/07\/imgi_8_open-vpn-1024x501-1-768x376.png 768w, https:\/\/rufreevpn.org\/wp-content\/uploads\/2026\/07\/imgi_8_open-vpn-1024x501-1-18x9.png 18w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Kh\u00e1c v\u1edbi c\u00e1c giao th\u1ee9c \u0111\u1ed9c quy\u1ec1n \u0111\u01b0\u1ee3c duy tr\u00ec k\u00edn \u0111\u00e1o b\u1edfi c\u00e1c t\u1eadp \u0111o\u00e0n \u0111\u01a1n l\u1ebb, OpenVPN ph\u00e1t tri\u1ec3n d\u1ef1a tr\u00ean n\u1ec1n t\u1ea3ng c\u1ee7a s\u1ef1 minh b\u1ea1ch tri\u1ec7t \u0111\u1ec3. To\u00e0n b\u1ed9 m\u00e3 ngu\u1ed3n c\u1ee7a n\u00f3 \u0111\u01b0\u1ee3c c\u00f4ng khai, m\u1eddi g\u1ecdi s\u1ef1 gi\u00e1m s\u00e1t li\u00ean t\u1ee5c, ki\u1ec3m to\u00e1n nghi\u00eam ng\u1eb7t v\u00e0 c\u1ea3i ti\u1ebfn h\u1ee3p t\u00e1c t\u1eeb m\u1ed9t c\u1ed9ng \u0111\u1ed3ng chuy\u00ean gia b\u1ea3o m\u1eadt to\u00e0n c\u1ea7u. S\u1ef1 gi\u00e1m s\u00e1t t\u1eadp th\u1ec3 n\u00e0y \u0111\u1ea3m b\u1ea3o c\u00e1c l\u1ed7 h\u1ed5ng \u0111\u01b0\u1ee3c kh\u1eafc ph\u1ee5c nhanh ch\u00f3ng, c\u1ee7ng c\u1ed1 danh ti\u1ebfng l\u00e2u d\u00e0i c\u1ee7a OpenVPN nh\u01b0 m\u1ed9t trong nh\u1eefng gi\u1ea3i ph\u00e1p ki\u00ean c\u01b0\u1eddng, \u0111\u00e1ng tin c\u1eady v\u00e0 \u0111\u01b0\u1ee3c tin c\u1eady nh\u1ea5t trong l\u0129nh v\u1ef1c an ninh m\u1ea1ng hi\u1ec7n \u0111\u1ea1i.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OpenVPN l\u00e0m g\u00ec?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">OpenVPN ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t c\u00f4ng c\u1ee5 x\u00e2y d\u1ef1ng \u0111\u01b0\u1eddng h\u1ea7m b\u1ea3o m\u1eadt, t\u1ea1o ra m\u1ed9t \u0111\u01b0\u1eddng d\u1eabn \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 cho d\u1eef li\u1ec7u di chuy\u1ec3n qua internet c\u00f4ng c\u1ed9ng th\u01b0\u1eddng kh\u00f4ng an to\u00e0n. N\u00f3 s\u1eed d\u1ee5ng giao th\u1ee9c SSL\/TLS (Secure Sockets Layer\/Transport Layer Security)\u2014c\u00f9ng m\u1ed9t ti\u00eau chu\u1ea9n b\u1ea3o m\u1eadt \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho ng\u00e2n h\u00e0ng tr\u1ef1c tuy\u1ebfn\u2014\u0111\u1ec3 m\u00e3 h\u00f3a t\u1ea5t c\u1ea3 th\u00f4ng tin truy\u1ec1n gi\u1eefa thi\u1ebft b\u1ecb c\u1ee7a ng\u01b0\u1eddi d\u00f9ng v\u00e0 m\u00e1y ch\u1ee7 VPN.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng d\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m, ch\u1eb3ng h\u1ea1n nh\u01b0 th\u00f4ng tin \u0111\u0103ng nh\u1eadp, h\u1ed3 s\u01a1 t\u00e0i ch\u00ednh v\u00e0 th\u00f4ng tin li\u00ean l\u1ea1c c\u00e1 nh\u00e2n, ho\u00e0n to\u00e0n kh\u00f4ng th\u1ec3 nh\u00ecn th\u1ea5y \u0111\u1ed1i v\u1edbi b\u00ean th\u1ee9 ba, bao g\u1ed3m:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5 Internet (ISPs)<\/li>\n\n\n\n<li>T\u1ed9i ph\u1ea1m m\u1ea1ng v\u00e0 tin t\u1eb7c tr\u00ean Wi-Fi c\u00f4ng c\u1ed9ng<\/li>\n\n\n\n<li>C\u00e1c c\u01a1 quan gi\u00e1m s\u00e1t c\u1ee7a ch\u00ednh ph\u1ee7<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1eb1ng c\u00e1ch che gi\u1ea5u \u0111\u1ecba ch\u1ec9 IP th\u1ef1c c\u1ee7a ng\u01b0\u1eddi d\u00f9ng b\u1eb1ng \u0111\u1ecba ch\u1ec9 IP c\u1ee7a m\u00e1y ch\u1ee7 VPN, OpenVPN c\u0169ng h\u1ed7 tr\u1ee3 duy\u1ec7t web \u1ea9n danh v\u00e0 kh\u1ea3 n\u0103ng truy c\u1eadp n\u1ed9i dung b\u1ecb gi\u1edbi h\u1ea1n \u0111\u1ecba l\u00fd. D\u00f9 l\u00e0 k\u1ebft n\u1ed1i m\u1ed9t nh\u00e2n vi\u00ean t\u1eeb xa v\u1edbi m\u1ea1ng c\u00f4ng ty hay b\u1ea3o m\u1eadt k\u1ebft n\u1ed1i c\u1ee7a m\u1ed9t du kh\u00e1ch, n\u00f3 cung c\u1ea5p m\u1ed9t gi\u1ea3i ph\u00e1p linh ho\u1ea1t, \u0111\u1eb3ng c\u1ea5p doanh nghi\u1ec7p \u0111\u1ec3 duy tr\u00ec quy\u1ec1n ri\u00eang t\u01b0 k\u1ef9 thu\u1eadt s\u1ed1 v\u00e0 t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Giao th\u1ee9c OpenVPN ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img alt=\"\" decoding=\"async\" width=\"1024\" height=\"501\" src=\"https:\/\/rufreevpn.org\/wp-content\/uploads\/2026\/07\/imgi_9_Image_twk9lqtwk9lqtwk9-1024x501-1.png\" class=\"wp-image-533\" srcset=\"https:\/\/rufreevpn.org\/wp-content\/uploads\/2026\/07\/imgi_9_Image_twk9lqtwk9lqtwk9-1024x501-1.png 1024w, https:\/\/rufreevpn.org\/wp-content\/uploads\/2026\/07\/imgi_9_Image_twk9lqtwk9lqtwk9-1024x501-1-600x294.png 600w, https:\/\/rufreevpn.org\/wp-content\/uploads\/2026\/07\/imgi_9_Image_twk9lqtwk9lqtwk9-1024x501-1-300x147.png 300w, https:\/\/rufreevpn.org\/wp-content\/uploads\/2026\/07\/imgi_9_Image_twk9lqtwk9lqtwk9-1024x501-1-768x376.png 768w, https:\/\/rufreevpn.org\/wp-content\/uploads\/2026\/07\/imgi_9_Image_twk9lqtwk9lqtwk9-1024x501-1-18x9.png 18w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">OpenVPN ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch thi\u1ebft l\u1eadp m\u1ed9t \u0111\u01b0\u1eddng h\u1ea7m m\u00e3 h\u00f3a an to\u00e0n gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7, bao b\u1ecdc d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n trong m\u1ed9t l\u1edbp b\u1ea3o v\u1ec7 khi n\u00f3 di chuy\u1ec3n qua internet.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To\u00e0n b\u1ed9 v\u00f2ng \u0111\u1eddi k\u1ebft n\u1ed1i tu\u00e2n theo m\u1ed9t quy tr\u00ecnh nghi\u00eam ng\u1eb7t, c\u00f3 \u0111\u1ed9 b\u1ea3o m\u1eadt cao:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>B\u1eaft tay m\u1eadt m\u00e3:<\/strong> Qu\u00e1 tr\u00ecnh b\u1eaft \u0111\u1ea7u b\u1eb1ng m\u1ed9t b\u01b0\u1edbc b\u1eaft tay ban \u0111\u1ea7u, n\u01a1i m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7 trao \u0111\u1ed5i ch\u1ee9ng ch\u1ec9 b\u1ea3o m\u1eadt ho\u1eb7c kh\u00f3a chia s\u1ebb tr\u01b0\u1edbc \u0111\u1ec3 x\u00e1c minh danh t\u00ednh c\u1ee7a nhau. Giai \u0111o\u1ea1n x\u00e1c th\u1ef1c n\u00e0y s\u1eed d\u1ee5ng giao th\u1ee9c SSL\/TLS \u0111\u1ec3 thi\u1ebft l\u1eadp m\u1ed9t b\u1ed9 kh\u00f3a m\u00e3 h\u00f3a duy nh\u1ea5t cho phi\u00ean l\u00e0m vi\u1ec7c c\u1ee5 th\u1ec3 \u0111\u00f3.<\/li>\n\n\n\n<li><strong>T\u1ea1o giao di\u1ec7n \u1ea3o:<\/strong> Khi danh t\u00ednh \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn, OpenVPN t\u1ea1o m\u1ed9t giao di\u1ec7n m\u1ea1ng \u1ea3o\u2014\u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 b\u1ed9 \u0111i\u1ec1u h\u1ee3p TUN (\u0111\u01b0\u1eddng h\u1ea7m) ho\u1eb7c TAP (v\u00f2i m\u1ea1ng)\u2014tr\u00ean thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n. Giao di\u1ec7n \u1ea3o n\u00e0y ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t c\u1ed5ng k\u1ebft n\u1ed1i; b\u1ea5t k\u1ef3 d\u1eef li\u1ec7u n\u00e0o \u0111\u01b0\u1ee3c g\u1eedi qua n\u00f3 \u0111\u1ec1u \u0111\u01b0\u1ee3c ph\u1ea7n m\u1ec1m OpenVPN t\u1ef1 \u0111\u1ed9ng m\u00e3 h\u00f3a tr\u01b0\u1edbc khi r\u1eddi kh\u1ecfi ph\u1ea7n c\u1ee9ng c\u1ee7a b\u1ea1n.<\/li>\n\n\n\n<li><strong>\u0110\u00f3ng g\u00f3i g\u00f3i tin &amp; V\u1eadn chuy\u1ec3n:<\/strong> Sau khi m\u00e3 h\u00f3a, d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c \u0111\u00f3ng g\u00f3i v\u00e0o c\u00e1c g\u00f3i IP ti\u00eau chu\u1ea9n. \u0110\u00e2y l\u00e0 m\u1ed9t b\u01b0\u1edbc quan tr\u1ecdng v\u00ec n\u00f3 che gi\u1ea5u b\u1ea3n ch\u1ea5t g\u1ed1c c\u1ee7a l\u01b0u l\u01b0\u1ee3ng. M\u1ed9t ng\u01b0\u1eddi quan s\u00e1t b\u00ean ngo\u00e0i nh\u01b0 ISP ch\u1ec9 th\u1ea5y c\u00e1c g\u00f3i \u0111\u00e3 m\u00e3 h\u00f3a \u0111ang di chuy\u1ec3n \u0111\u1ebfn m\u00e1y ch\u1ee7 OpenVPN, thay v\u00ec c\u00e1c trang web c\u1ee5 th\u1ec3 b\u1ea1n \u0111ang truy c\u1eadp.<\/li>\n\n\n\n<li><strong>Gi\u1ea3i m\u00e3 &amp; Giao h\u00e0ng:<\/strong> Khi \u0111\u1ebfn \u0111\u01b0\u1ee3c m\u00e1y ch\u1ee7 VPN, quy tr\u00ecnh \u0111\u01b0\u1ee3c \u0111\u1ea3o ng\u01b0\u1ee3c: m\u00e1y ch\u1ee7 gi\u1ea3i m\u00e3 c\u00e1c g\u00f3i tin v\u00e0 chuy\u1ec3n ti\u1ebfp y\u00eau c\u1ea7u \u0111\u1ebfn \u0111\u00edch cu\u1ed1i c\u00f9ng c\u1ee7a n\u00f3 tr\u00ean internet, tr\u1ea3 l\u1ea1i k\u1ebft qu\u1ea3 qua c\u00f9ng m\u1ed9t \u0111\u01b0\u1eddng h\u1ea7m b\u1ea3o m\u1eadt.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">OpenVPN TCP vs. UDP: Giao th\u1ee9c n\u00e0o b\u1ea1n n\u00ean ch\u1ecdn?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Khi tri\u1ec3n khai OpenVPN, b\u1ea1n c\u00f3 s\u1ef1 linh ho\u1ea1t \u0111\u1ec3 ch\u1ea1y l\u01b0u l\u01b0\u1ee3ng qua hai giao th\u1ee9c t\u1ea7ng v\u1eadn chuy\u1ec3n ri\u00eang bi\u1ec7t: UDP ho\u1eb7c TCP. Vi\u1ec7c l\u1ef1a ch\u1ecdn gi\u1eefa ch\u00fang cho ph\u00e9p b\u1ea1n t\u00f9y ch\u1ec9nh k\u1ebft n\u1ed1i c\u1ee7a m\u00ecnh \u0111\u1ec3 c\u00e2n b\u1eb1ng t\u1ed1c \u0111\u1ed9 th\u1ef1c v\u1edbi kh\u1ea3 n\u0103ng ph\u1ee5c h\u1ed3i k\u1ebft n\u1ed1i.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">UDP (Giao th\u1ee9c truy\u1ec1n d\u1eef li\u1ec7u ng\u01b0\u1eddi d\u00f9ng) \u2014 Nhanh &amp; Hi\u1ec7u qu\u1ea3<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">UDP l\u00e0 m\u1eb7c \u0111\u1ecbnh c\u1ee7a ng\u00e0nh v\u00e0 l\u00e0 l\u1ef1a ch\u1ecdn \u01b0a th\u00edch c\u1ee7a h\u1ea7u h\u1ebft ng\u01b0\u1eddi d\u00f9ng. B\u1edfi v\u00ec n\u00f3 gi\u1ea3m b\u1edbt chi ph\u00ed li\u00ean quan \u0111\u1ebfn vi\u1ec7c s\u1eeda l\u1ed7i v\u00e0 x\u00e1c nh\u1eadn g\u00f3i tin, UDP mang l\u1ea1i \u0111\u1ed9 tr\u1ec5 th\u1ea5p c\u1ea7n thi\u1ebft cho c\u00e1c ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u su\u1ea5t cao.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>T\u1ed1t nh\u1ea5t d\u00f9ng cho:<\/strong> Ph\u00e1t tr\u1ef1c tuy\u1ebfn video \u0111\u1ed9 n\u00e9t cao, ch\u01a1i game tr\u1ef1c tuy\u1ebfn v\u00e0 cu\u1ed9c g\u1ecdi VoIP.<\/li>\n\n\n\n<li><strong>L\u1ee3i th\u1ebf ch\u00ednh:<\/strong> Duy\u1ec7t web t\u1ed5ng qu\u00e1t m\u01b0\u1ee3t m\u00e0 v\u00e0 ph\u1ea3n h\u1ed3i nhanh h\u01a1n.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">TCP (Transmission Control Protocol) \u2014 \u0110\u00e1ng tin c\u1eady &amp; T\u00e0ng h\u00ecnh<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">TCP nh\u1ea5n m\u1ea1nh \u0111\u1ed9 tin c\u1eady v\u00e0 \u0111\u1ea3m b\u1ea3o ph\u00e2n ph\u1ed1i g\u00f3i tin h\u01a1n hi\u1ec7u su\u1ea5t th\u00f4. M\u1eb7c d\u00f9 n\u00f3 ch\u1eadm h\u01a1n v\u1ec1 b\u1ea3n ch\u1ea5t do c\u00e1c c\u01a1 ch\u1ebf ki\u1ec3m tra l\u1ed7i v\u00e0 s\u1eafp x\u1ebfp th\u1ee9 t\u1ef1 g\u00f3i tin nghi\u00eam ng\u1eb7t, TCP l\u00e0 m\u1ed9t ph\u01b0\u01a1ng \u00e1n d\u1ef1 ph\u00f2ng thi\u1ebft y\u1ebfu trong c\u00e1c m\u00f4i tr\u01b0\u1eddng m\u1ea1ng h\u1ea1n ch\u1ebf.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>T\u1ed1t nh\u1ea5t d\u00f9ng cho:<\/strong> V\u01b0\u1ee3t qua ki\u1ec3m duy\u1ec7t nghi\u00eam ng\u1eb7t, t\u01b0\u1eddng l\u1eeda v\u00e0 \u0111i\u1ec1u ki\u1ec7n m\u1ea1ng kh\u00f4ng \u1ed5n \u0111\u1ecbnh.<\/li>\n\n\n\n<li><strong>L\u1ee3i th\u1ebf ch\u00ednh:<\/strong> N\u00f3 c\u00f3 th\u1ec3 ch\u1ea1y tr\u00ean C\u1ed5ng 443 (c\u1ed5ng ti\u00eau chu\u1ea9n cho l\u01b0u l\u01b0\u1ee3ng HTTPS), cho ph\u00e9p c\u00e1c k\u1ebft n\u1ed1i OpenVPN h\u00f2a tr\u1ed9n hi\u1ec7u qu\u1ea3 v\u1edbi ho\u1ea1t \u0111\u1ed9ng duy\u1ec7t web th\u00f4ng th\u01b0\u1eddng v\u00e0 v\u01b0\u1ee3t qua Ki\u1ec3m tra G\u00f3i tin S\u00e2u (DPI).<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u01afu \u0111i\u1ec3m v\u00e0 Nh\u01b0\u1ee3c \u0111i\u1ec3m C\u1ed1t l\u00f5i c\u1ee7a OpenVPN<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 cung c\u1ea5p cho b\u1ea1n m\u1ed9t c\u00e1i nh\u00ecn t\u1ed5ng quan nhanh v\u1ec1 giao th\u1ee9c n\u00e0y, \u0111\u00e2y l\u00e0 ph\u00e2n t\u00edch v\u1ec1 c\u00e1c \u0111i\u1ec3m m\u1ea1nh ch\u00ednh v\u00e0 c\u00e1c h\u1ea1n ch\u1ebf k\u1ef9 thu\u1eadt c\u1ed1 h\u1eefu c\u1ee7a OpenVPN&#8217;s:<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OpenVPN so v\u1edbi c\u00e1c Giao th\u1ee9c VPN kh\u00e1c<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Khi \u0111\u00e1nh gi\u00e1 OpenVPN so v\u1edbi c\u00e1c l\u1ef1a ch\u1ecdn thay th\u1ebf trong h\u1ec7 sinh th\u00e1i m\u1ea1ng, \u0111i\u1ec1u quan tr\u1ecdng l\u00e0 ph\u1ea3i c\u00e2n b\u1eb1ng gi\u1eefa t\u00ednh linh ho\u1ea1t v\u00f4 song c\u1ee7a n\u00f3 v\u1edbi t\u1ed1c \u0111\u1ed9 th\u00f4 c\u1ee7a c\u00e1c giao th\u1ee9c m\u1edbi h\u01a1n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">OpenVPN so v\u1edbi WireGuard<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">WireGuard l\u00e0 \u0111\u1ed1i th\u1ee7 hi\u1ec7n \u0111\u1ea1i ch\u00ednh th\u00e1ch th\u1ee9c s\u1ef1 th\u1ed1ng tr\u1ecb c\u1ee7a OpenVPN. Kh\u00f4ng gi\u1ed1ng nh\u01b0 m\u00e3 ngu\u1ed3n kh\u1ed5ng l\u1ed3 c\u1ee7a OpenVPN v\u1edbi h\u01a1n 100.000 d\u00f2ng m\u00e3, WireGuard ch\u1ec9 ch\u1ee9a kho\u1ea3ng 4.000 d\u00f2ng. S\u1ef1 \u0111\u01a1n gi\u1ea3n tri\u1ec7t \u0111\u1ec3 n\u00e0y gi\u00fap WireGuard nhanh h\u01a1n \u0111\u00e1ng k\u1ec3 v\u00e0 ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng h\u01a1n nhi\u1ec1u tr\u00ean c\u00e1c thi\u1ebft b\u1ecb di \u0111\u1ed9ng. Tuy nhi\u00ean, OpenVPN v\u1eabn gi\u1eef l\u1ee3i th\u1ebf v\u1ec1 t\u00f9y ch\u1ec9nh quy\u1ec1n ri\u00eang t\u01b0 v\u00e0 kh\u1ea3 n\u0103ng t\u00e0ng h\u00ecnh ch\u1ed1ng ki\u1ec3m duy\u1ec7t, v\u00ec n\u00f3 c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp \u0111\u1ec3 v\u01b0\u1ee3t qua c\u00e1c r\u00e0o ch\u1eafn t\u01b0\u1eddng l\u1eeda v\u1ed1n d\u1ec5 d\u00e0ng ch\u1eb7n ki\u1ebfn tr\u00fac UDP c\u1ed1 \u0111\u1ecbnh c\u1ee7a WireGuard.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">OpenVPN vs. IKEv2\/IPSec<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">IKEv2 (Internet Key Exchange version 2) \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn r\u1ed9ng r\u00e3i v\u00ec hi\u1ec7u su\u1ea5t v\u01b0\u1ee3t tr\u1ed9i tr\u00ean m\u1ea1ng di \u0111\u1ed9ng. L\u1ee3i th\u1ebf ch\u00ednh c\u1ee7a n\u00f3 l\u00e0 kh\u1ea3 n\u0103ng MOBIKE (Mobility and Multihoming), cho ph\u00e9p chuy\u1ec3n \u0111\u1ed5i gi\u1eefa m\u1ea1ng Wi-Fi v\u00e0 m\u1ea1ng di \u0111\u1ed9ng g\u1ea7n nh\u01b0 t\u1ee9c th\u1eddi m\u00e0 kh\u00f4ng l\u00e0m \u0111\u1ee9t \u0111\u01b0\u1eddng h\u1ea7m VPN. M\u1eb7c d\u00f9 IKEv2 th\u01b0\u1eddng nhanh h\u01a1n tr\u00ean c\u00e1c h\u1ec7 th\u1ed1ng di \u0111\u1ed9ng c\u0169 h\u01a1n c\u00f3 t\u00edch h\u1ee3p t\u0103ng t\u1ed1c AES, nh\u01b0ng n\u00f3 d\u1ec5 b\u1ecb qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng ch\u1eb7n h\u01a1n nhi\u1ec1u. OpenVPN v\u1eabn \u0111\u01b0\u1ee3c \u01b0a chu\u1ed9ng \u0111\u1ec3 v\u01b0\u1ee3t qua ki\u1ec3m tra g\u00f3i tin s\u00e2u trong c\u00e1c m\u00f4i tr\u01b0\u1eddng b\u1ecb ki\u1ec3m duy\u1ec7t n\u1eb7ng n\u1ec1.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">OpenVPN so v\u1edbi c\u00e1c Giao th\u1ee9c K\u1ebf th\u1eeba (PPTP v\u00e0 L2TP)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">So v\u1edbi c\u00e1c giao th\u1ee9c c\u0169 nh\u01b0 PPTP ho\u1eb7c L2TP\/IPSec, OpenVPN v\u01b0\u1ee3t tr\u1ed9i h\u01a1n h\u1eb3n. PPTP hi\u1ec7n \u0111\u00e3 ho\u00e0n to\u00e0n l\u1ed7i th\u1eddi do c\u00e1c l\u1ed7 h\u1ed5ng m\u1eadt m\u00e3 nghi\u00eam tr\u1ecdng c\u00f3 th\u1ec3 b\u1ecb khai th\u00e1c trong v\u00e0i ph\u00fat. M\u1eb7c d\u00f9 L2TP cung c\u1ea5p b\u1ea3o m\u1eadt t\u1ed1t h\u01a1n PPTP, nh\u01b0ng n\u00f3 thi\u1ebfu t\u00ednh linh ho\u1ea1t m\u00e3 h\u00f3a tinh vi v\u00e0 t\u00ednh minh b\u1ea1ch m\u00e3 ngu\u1ed3n m\u1edf v\u1ed1n \u0111\u1ecbnh h\u00ecnh n\u00ean OpenVPN.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OpenVPN c\u00f3 an to\u00e0n kh\u00f4ng?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>V\u00e2ng, OpenVPN c\u1ef1c k\u1ef3 an to\u00e0n.<\/strong> H\u1ed3 s\u01a1 an to\u00e0n \u0111\u1eb3ng c\u1ea5p th\u1ebf gi\u1edbi c\u1ee7a n\u00f3 \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh t\u1eeb s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa m\u00e3 h\u00f3a c\u1ea5p c\u00f4ng nghi\u1ec7p, t\u00ednh minh b\u1ea1ch m\u00e3 ngu\u1ed3n m\u1edf v\u00e0 th\u00e0nh t\u00edch \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng minh v\u1ec1 kh\u1ea3 n\u0103ng ch\u1ed1ng ch\u1ecbu tr\u01b0\u1edbc c\u00e1c m\u1ed1i \u0111e d\u1ecda m\u1ea1ng hi\u1ec7n \u0111\u1ea1i.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ti\u00eau chu\u1ea9n m\u00e3 h\u00f3a c\u1ea5p c\u00f4ng nghi\u1ec7p<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">OpenVPN \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng d\u1ef1a tr\u00ean th\u01b0 vi\u1ec7n OpenSSL, cho ph\u00e9p n\u00f3 s\u1eed d\u1ee5ng nhi\u1ec1u thu\u1eadt to\u00e1n m\u00e3 h\u00f3a tinh vi. Tri\u1ec3n khai ph\u1ed5 bi\u1ebfn nh\u1ea5t l\u00e0 AES-256-GCM, m\u1ee9c m\u00e3 h\u00f3a ch\u00ednh x\u00e1c \u0111\u01b0\u1ee3c c\u00e1c t\u1ed5 ch\u1ee9c t\u00e0i ch\u00ednh, qu\u00e2n \u0111\u1ed9i v\u00e0 c\u01a1 quan ch\u00ednh ph\u1ee7 s\u1eed d\u1ee5ng \u0111\u1ec3 b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u t\u1ed1i m\u1eadt. N\u00f3 c\u0169ng h\u1ed7 tr\u1ee3 Perfect Forward Secrecy (PFS), \u0111\u1ea3m b\u1ea3o r\u1eb1ng ngay c\u1ea3 khi m\u1ed9t kh\u00f3a phi\u00ean c\u1ee5 th\u1ec3 b\u1ecb x\u00e2m ph\u1ea1m trong t\u01b0\u01a1ng lai, t\u1ea5t c\u1ea3 c\u00e1c phi\u00ean trong qu\u00e1 kh\u1ee9 v\u00e0 t\u01b0\u01a1ng lai v\u1eabn \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a ho\u00e0n to\u00e0n v\u00e0 an to\u00e0n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">An ninh c\u1ee7a s\u1ef1 minh b\u1ea1ch tri\u1ec7t \u0111\u1ec3<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Kh\u00f4ng gi\u1ed1ng nh\u01b0 c\u00e1c giao th\u1ee9c VPN \u0111\u1ed9c quy\u1ec1n n\u01a1i m\u00e3 ngu\u1ed3n l\u00e0 b\u00ed m\u1eadt kinh doanh \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 ch\u1eb7t ch\u1ebd, b\u1ea3n ch\u1ea5t m\u00e3 ngu\u1ed3n m\u1edf c\u1ee7a OpenVPN&#8217;s c\u00f3 ngh\u0129a l\u00e0 c\u01a1 s\u1edf m\u00e3 c\u1ee7a n\u00f3 lu\u00f4n \u0111\u01b0\u1ee3c c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u b\u1ea3o m\u1eadt \u0111\u1ed9c l\u1eadp v\u00e0 hacker m\u0169 tr\u1eafng gi\u00e1m s\u00e1t li\u00ean t\u1ee5c tr\u00ean to\u00e0n th\u1ebf gi\u1edbi. M\u1ecdi l\u1ed7 h\u1ed5ng ho\u1eb7c khai th\u00e1c ti\u1ec1m \u1ea9n \u0111\u1ec1u \u0111\u01b0\u1ee3c c\u1ed9ng \u0111\u1ed3ng x\u00e1c \u0111\u1ecbnh v\u00e0 v\u00e1 tr\u01b0\u1edbc khi ch\u00fang c\u00f3 th\u1ec3 b\u1ecb c\u00e1c t\u00e1c nh\u00e2n \u0111\u1ed9c h\u1ea1i l\u1ee3i d\u1ee5ng.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Kh\u1ea3 n\u0103ng ph\u1ee5c h\u1ed3i v\u00e0 X\u00e1c th\u1ef1c \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng minh<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Trong su\u1ed1t hai th\u1eadp k\u1ef7 t\u1ed3n t\u1ea1i, OpenVPN \u0111\u00e3 tr\u1ea3i qua nhi\u1ec1u cu\u1ed9c ki\u1ec3m to\u00e1n chuy\u00ean nghi\u1ec7p t\u1eeb b\u00ean th\u1ee9 ba, li\u00ean t\u1ee5c ch\u1ee9ng minh t\u00ednh to\u00e0n v\u1eb9n ki\u1ebfn tr\u00fac c\u1ee7a n\u00f3. Ngo\u00e0i vi\u1ec7c che gi\u1ea5u l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp, n\u00f3 c\u00f2n cung c\u1ea5p c\u00e1c ph\u01b0\u01a1ng ph\u00e1p x\u00e1c th\u1ef1c m\u1ea1nh m\u1ebd \u0111\u1ec3 ng\u0103n ch\u1eb7n truy c\u1eadp tr\u00e1i ph\u00e9p, bao g\u1ed3m h\u1ed7 tr\u1ee3 cho:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ch\u1ee9ng ch\u1ec9 k\u1ef9 thu\u1eadt s\u1ed1<\/li>\n\n\n\n<li>X\u00e1c th\u1ef1c \u0111a y\u1ebfu t\u1ed1\/X\u00e1c th\u1ef1c hai y\u1ebfu t\u1ed1 (2FA)<\/li>\n\n\n\n<li>Th\u1ebb th\u00f4ng minh ph\u1ea7n c\u1ee9ng<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Kh\u1ea3 n\u0103ng \u0111\u1ed9c \u0111\u00e1o c\u1ee7a n\u00f3 trong vi\u1ec7c ng\u1ee5y trang d\u1ea5u v\u1ebft c\u1ee7a m\u00ecnh nh\u01b0 l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp web th\u00f4ng th\u01b0\u1eddng khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh m\u1ed9t trong nh\u1eefng giao th\u1ee9c an to\u00e0n nh\u1ea5t d\u00e0nh cho ng\u01b0\u1eddi d\u00f9ng c\u1ea7n duy tr\u00ec t\u00ednh \u1ea9n danh m\u00e0 kh\u00f4ng k\u00edch ho\u1ea1t c\u00e1c c\u1ea3nh b\u00e1o tr\u00ean h\u1ec7 th\u1ed1ng gi\u00e1m s\u00e1t m\u1ea1ng.<\/p>","protected":false},"excerpt":{"rendered":"<p>OpenVPN is a premier open-source VPN protocol and robust software suite engineered to establish highly secure point-to-point or site-to-site connections across the public internet. Since its debut in 2001 by James Yonan, it has evolved into a global industry standard, lauded for its ability to traverse complex networks and bypass restrictive firewalls. Unlike proprietary protocols [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":532,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"What Is OpenVPN? The Ultimate Guide to the Trusted VPN Protocol","_seopress_titles_desc":"Learn how the OpenVPN protocol works. 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