{"id":524,"date":"2026-07-06T06:08:30","date_gmt":"2026-07-06T06:08:30","guid":{"rendered":"https:\/\/rufreevpn.org\/"},"modified":"2026-07-06T06:29:46","modified_gmt":"2026-07-06T06:29:46","slug":"what-is-a-vpn-protocol","status":"publish","type":"post","link":"https:\/\/rufreevpn.org\/vi\/post\/what-is-a-vpn-protocol\/","title":{"rendered":"Giao th\u1ee9c VPN l\u00e0 g\u00ec?"},"content":{"rendered":"

Giao th\u1ee9c VPN l\u00e0 m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c quy t\u1eafc v\u00e0 h\u01b0\u1edbng d\u1eabn chu\u1ea9n h\u00f3a quy\u1ebft \u0111\u1ecbnh c\u00e1ch d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n ch\u00ednh x\u00e1c gi\u1eefa thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n v\u00e0 m\u00e1y ch\u1ee7 VPN. H\u00e3y coi n\u00f3 nh\u01b0 “s\u00e1ch h\u01b0\u1edbng d\u1eabn” cho \u0111\u01b0\u1eddng h\u1ea7m b\u1ea3o m\u1eadt, x\u00e1c \u0111\u1ecbnh c\u00e1c ph\u01b0\u01a1ng ph\u00e1p ch\u00ednh x\u00e1c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 m\u00e3 h\u00f3a, x\u00e1c th\u1ef1c v\u00e0 \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u. Trong khi b\u1ea3n th\u00e2n VPN thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i, giao th\u1ee9c quy\u1ebft \u0111\u1ecbnh s\u1ef1 c\u00e2n b\u1eb1ng quan tr\u1ecdng gi\u1eefa t\u1ed1c \u0111\u1ed9, b\u1ea3o m\u1eadt v\u00e0 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh. V\u00ed d\u1ee5, m\u1ed9t s\u1ed1 giao th\u1ee9c \u01b0u ti\u00ean m\u00e3 h\u00f3a m\u1ea1nh \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o quy\u1ec1n ri\u00eang t\u01b0 t\u1ed1i \u0111a, trong khi nh\u1eefng giao th\u1ee9c kh\u00e1c gi\u1ea3m thi\u1ec3u chi ph\u00ed \u0111\u1ec3 mang l\u1ea1i t\u1ed1c \u0111\u1ed9 nhanh nh\u1ea5t c\u00f3 th\u1ec3 cho vi\u1ec7c ph\u00e1t tr\u1ef1c tuy\u1ebfn ho\u1eb7c ch\u01a1i game.<\/p>\n\n\n\n

\n

C\u00e1c giao th\u1ee9c VPN ph\u1ed5 bi\u1ebfn<\/h3>\n

C\u00e1c giao th\u1ee9c kh\u00e1c nhau s\u1eed d\u1ee5ng c\u00e1c k\u1ef9 thu\u1eadt m\u00e3 h\u00f3a kh\u00e1c nhau \u0111\u1ec3 x\u1eed l\u00fd d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 ph\u00e2n t\u00edch v\u1ec1 nh\u1eefng k\u1ef9 thu\u1eadt \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i nh\u1ea5t:<\/p>\n \n

\n \n \n \n \n \n \n \n \n
Giao th\u1ee9c<\/th>\n \u0110\u1eb7c \u0111i\u1ec3m ch\u00ednh & Tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng<\/th>\n <\/tr>\n <\/thead>\n
\n WireGuard<\/a>\n <\/td>\n Ti\u00eau chu\u1ea9n hi\u1ec7n \u0111\u1ea1i \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn v\u1edbi m\u00e3 ngu\u1ed3n g\u1ecdn nh\u1eb9 v\u00e0 t\u1ed1c \u0111\u1ed9 v\u01b0\u1ee3t tr\u1ed9i. L\u00fd t\u01b0\u1edfng cho m\u1ea1ng hi\u1ec7u su\u1ea5t cao v\u00e0 \u0111\u1ed9 tr\u1ec5 th\u1ea5p.<\/td>\n <\/tr>\n
\n OpenVPN<\/a>\n <\/td>\n M\u1ed9t giao th\u1ee9c m\u00e3 ngu\u1ed3n m\u1edf, c\u1ef1c k\u1ef3 linh ho\u1ea1t, \u0111\u01b0\u1ee3c coi r\u1ed9ng r\u00e3i l\u00e0 ti\u00eau chu\u1ea9n \u0111\u00e1ng tin c\u1eady c\u1ee7a ng\u00e0nh v\u1ec1 kh\u1ea3 n\u0103ng b\u1ea3o m\u1eadt v\u00e0 v\u01b0\u1ee3t t\u01b0\u1eddng l\u1eeda.<\/td>\n <\/tr>\n
\n IKEv2\/IPsec<\/a>\n <\/td>\n Tuy\u1ec7t v\u1eddi cho c\u00e1c thi\u1ebft b\u1ecb di \u0111\u1ed9ng v\u00ec n\u00f3 c\u00f3 hi\u1ec7u qu\u1ea3 cao trong vi\u1ec7c thi\u1ebft l\u1eadp l\u1ea1i k\u1ebft n\u1ed1i khi chuy\u1ec3n \u0111\u1ed5i gi\u1eefa Wi-Fi v\u00e0 d\u1eef li\u1ec7u di \u0111\u1ed9ng.<\/td>\n <\/tr>\n
\n L2TP\/IPsec<\/a>\n <\/td>\n M\u1ed9t giao th\u1ee9c c\u0169 h\u01a1n th\u01b0\u1eddng ch\u1eadm h\u01a1n nh\u01b0ng v\u1eabn \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u01b0\u01a1ng th\u00edch c\u01a1 b\u1ea3n tr\u00ean c\u00e1c h\u1ec7 th\u1ed1ng k\u1ebf th\u1eeba v\u00e0 ph\u1ea7n c\u1ee9ng c\u0169.<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n<\/div>\n\n\n\n

WireGuard: Ti\u00eau chu\u1ea9n Hi\u1ec7n \u0111\u1ea1i cho \u0110\u01b0\u1eddng h\u1ea7m B\u1ea3o m\u1eadt<\/h2>\n\n\n\n

WireGuard \u0111\u00e1nh d\u1ea5u b\u01b0\u1edbc ti\u1ebfn v\u01b0\u1ee3t b\u1eadc trong l\u0129nh v\u1ef1c m\u1ea1ng an to\u00e0n, n\u1ed5i l\u00ean nh\u01b0 m\u1ed9t gi\u1ea3i ph\u00e1p thay th\u1ebf hi\u1ec7n \u0111\u1ea1i, tinh g\u1ecdn cho c\u00e1c giao th\u1ee9c c\u0169 nh\u01b0 IPsec v\u00e0 OpenVPN. \u0110\u01b0\u1ee3c t\u1ea1o ra b\u1edfi Jason Donenfeld, s\u1ee9 m\u1ec7nh c\u1ee7a n\u00f3 r\u1ea5t \u0111\u01a1n gi\u1ea3n: lo\u1ea1i b\u1ecf nh\u1eefng ki\u1ebfn tr\u00fac c\u1ed3ng k\u1ec1nh c\u1ee7a qu\u00e1 kh\u1ee9. Trong khi c\u00e1c giao th\u1ee9c truy\u1ec1n th\u1ed1ng b\u1ecb k\u00ecm h\u00e3m b\u1edfi nh\u1eefng codebase kh\u1ed5ng l\u1ed3 l\u00ean t\u1edbi h\u00e0ng tr\u0103m ngh\u00ecn d\u00f2ng, WireGuard ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng v\u1edbi kho\u1ea3ng 4.000 d\u00f2ng code. S\u1ef1 t\u1ed1i gi\u1ea3n n\u00e0y l\u00e0 m\u1ed9t chi\u1ebfn l\u01b0\u1ee3c b\u1ea3o m\u1eadt tuy\u1ec7t v\u1eddi\u2014m\u1ed9t codebase g\u1ecdn nh\u1eb9 h\u01a1n \u0111\u1ed3ng ngh\u0129a v\u1edbi b\u1ec1 m\u1eb7t t\u1ea5n c\u00f4ng nh\u1ecf h\u01a1n \u0111\u00e1ng k\u1ec3, gi\u00fap vi\u1ec7c ki\u1ec3m to\u00e1n \u0111\u1ed9c l\u1eadp tr\u1edf n\u00ean \u0111\u01a1n gi\u1ea3n v\u00e0 c\u00e1c b\u1ea3n v\u00e1 b\u1ea3o m\u1eadt nhanh nh\u01b0 ch\u1edbp.<\/p>\n\n\n\n

\"WireGuard\"
WireGuard<\/figcaption><\/figure>\n\n\n\n

WireGuard kh\u00f4ng ch\u1ec9 an to\u00e0n; n\u00f3 \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng cho hi\u1ec7u su\u1ea5t th\u00f4. B\u1eb1ng c\u00e1ch ch\u1ea1y tr\u1ef1c ti\u1ebfp trong kh\u00f4ng gian nh\u00e2n Linux, n\u00f3 b\u1ecf qua chi ph\u00ed hi\u1ec7u su\u1ea5t n\u1eb7ng n\u1ec1 v\u00e0 chuy\u1ec3n \u0111\u1ed5i ng\u1eef c\u1ea3nh l\u00e0m ch\u1eadm c\u00e1c giao th\u1ee9c kh\u00f4ng gian ng\u01b0\u1eddi d\u00f9ng c\u0169. Thay v\u00ec m\u00e3 h\u00f3a l\u1ed7i th\u1eddi, n\u00f3 d\u1ef1a v\u00e0o m\u1ed9t \"b\u1ed9 m\u00e3 h\u00f3a\" ti\u00ean ti\u1ebfn bao g\u1ed3m ChaCha20, Curve25519 v\u00e0 Poly1305. C\u00e1c thu\u1eadt to\u00e1n hi\u1ec7n \u0111\u1ea1i n\u00e0y c\u1ef1c k\u1ef3 hi\u1ec7u qu\u1ea3 tr\u00ean h\u1ea7u h\u1ebft m\u1ecdi ph\u1ea7n c\u1ee9ng, ngay c\u1ea3 khi kh\u00f4ng c\u00f3 t\u0103ng t\u1ed1c AES t\u00edch h\u1ee3p. K\u1ebft qu\u1ea3? Ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1eddi gian k\u1ebft n\u1ed1i g\u1ea7n nh\u01b0 t\u1ee9c th\u00ec, chuy\u1ec3n \u0111\u1ed5i li\u1ec1n m\u1ea1ch gi\u1eefa c\u00e1c m\u1ea1ng v\u00e0 hi\u1ec7u su\u1ea5t kh\u00f4ng ai s\u00e1nh k\u1ecbp.<\/p>\n\n\n\n

Di s\u1ea3n v\u00e0 s\u1ee9c m\u1ea1nh c\u1ee7a OpenVPN<\/h2>\n\n\n\n

Trong g\u1ea7n hai th\u1eadp k\u1ef7, OpenVPN \u0111\u00e3 \u0111\u00f3ng vai tr\u00f2 l\u00e0 ti\u00eau chu\u1ea9n ng\u00e0nh c\u00f4ng nghi\u1ec7p d\u1ee9t kho\u00e1t \u0111\u1ec3 t\u1ea1o ra c\u00e1c k\u1ebft n\u1ed1i \u0111i\u1ec3m-\u0111i\u1ec3m v\u00e0 \u0111i\u1ec3m-\u0111i\u1ec3m-\u0111i\u1ec3m an to\u00e0n. \u0110\u01b0\u1ee3c ph\u00e1t h\u00e0nh v\u00e0o n\u0103m 2001, giao th\u1ee9c m\u00e3 ngu\u1ed3n m\u1edf n\u00e0y \u0111\u00e3 c\u00e1ch m\u1ea1ng h\u00f3a ng\u00e0nh c\u00f4ng nghi\u1ec7p b\u1eb1ng c\u00e1ch cung c\u1ea5p m\u1ed9t c\u00e1ch minh b\u1ea1ch v\u00e0 c\u00f3 th\u1ec3 t\u00f9y ch\u1ec9nh cao \u0111\u1ec3 b\u1ea3o m\u1eadt d\u1eef li\u1ec7u. Tu\u1ed5i th\u1ecd c\u1ee7a n\u00f3 ph\u1ea7n l\u1edbn l\u00e0 do b\u1ea3n ch\u1ea5t “\u0111\u00e3 \u0111\u01b0\u1ee3c ki\u1ec3m ch\u1ee9ng qua th\u1ef1c chi\u1ebfn”; b\u1edfi v\u00ec m\u00e3 ngu\u1ed3n \u0111\u01b0\u1ee3c m\u1edf cho b\u1ea5t k\u1ef3 ai ki\u1ec3m tra, n\u00f3 \u0111\u00e3 tr\u1ea3i qua nhi\u1ec1u th\u1eadp k\u1ef7 ki\u1ec3m to\u00e1n \u0111\u1ed9c l\u1eadp nghi\u00eam ng\u1eb7t. S\u1ef1 minh b\u1ea1ch n\u00e0y \u0111\u00e3 x\u00e2y d\u1ef1ng m\u1ed9t m\u1ee9c \u0111\u1ed9 tin c\u1eady m\u00e0 \u00edt giao th\u1ee9c kh\u00e1c c\u00f3 th\u1ec3 s\u00e1nh k\u1ecbp, khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh l\u1ef1a ch\u1ecdn y\u00eau th\u00edch c\u1ee7a c\u00e1c t\u1ed5 ch\u1ee9c c\u00f3 \u00fd th\u1ee9c v\u1ec1 quy\u1ec1n ri\u00eang t\u01b0 v\u00e0 ng\u01b0\u1eddi d\u00f9ng c\u00e1 nh\u00e2n \u01b0u ti\u00ean th\u00e0nh t\u00edch \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng minh h\u01a1n t\u1ed1c \u0111\u1ed9 th\u1eed nghi\u1ec7m.<\/p>\n\n\n\n

\"OpenVPN
OpenVPN ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/figcaption><\/figure>\n\n\n\n

M\u1ed9t trong nh\u1eefng l\u1ee3i th\u1ebf quan tr\u1ecdng nh\u1ea5t c\u1ee7a OpenVPN l\u00e0 t\u00ednh linh ho\u1ea1t v\u01b0\u1ee3t tr\u1ed9i trong vi\u1ec7c v\u01b0\u1ee3t qua c\u00e1c t\u01b0\u1eddng l\u1eeda h\u1ea1n ch\u1ebf v\u00e0 ki\u1ec3m duy\u1ec7t m\u1ea1ng. Kh\u00f4ng gi\u1ed1ng nh\u01b0 nhi\u1ec1u giao th\u1ee9c b\u1ecb gi\u1edbi h\u1ea1n \u1edf c\u00e1c c\u1ed5ng c\u1ee5 th\u1ec3, OpenVPN c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh \u0111\u1ec3 ch\u1ea1y tr\u00ean c\u1ea3 UDP \u0111\u1ec3 \u0111\u1ea1t t\u1ed1c \u0111\u1ed9 t\u1ed1i \u0111a v\u00e0 TCP \u0111\u1ec3 \u0111\u1ea1t \u0111\u1ed9 tin c\u1eady t\u1ed1i \u0111a. B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u1ed5ng TCP 443\u2014c\u1ed5ng gi\u1ed1ng nh\u01b0 c\u1ed5ng d\u00f9ng cho l\u01b0u l\u01b0\u1ee3ng HTTPS ti\u00eau chu\u1ea9n\u2014OpenVPN c\u00f3 th\u1ec3 ng\u1ee5y trang hi\u1ec7u qu\u1ea3 d\u1eef li\u1ec7u VPN th\u00e0nh duy\u1ec7t web th\u00f4ng th\u01b0\u1eddng. \u0110i\u1ec1u n\u00e0y khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh c\u00f4ng c\u1ee5 m\u1ea1nh m\u1ebd cho ng\u01b0\u1eddi d\u00f9ng trong m\u00f4i tr\u01b0\u1eddng ki\u1ec3m duy\u1ec7t cao, n\u01a1i c\u00e1c d\u1ea5u hi\u1ec7u nh\u1eadn d\u1ea1ng VPN kh\u00e1c d\u1ec5 b\u1ecb ph\u00e1t hi\u1ec7n v\u00e0 ch\u1eb7n b\u1edfi Deep Packet Inspection (DPI).<\/p>\n\n\n\n

N\u1ec1n t\u1ea3ng b\u1ea3o m\u1eadt c\u1ee7a OpenVPN \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng d\u1ef1a tr\u00ean th\u01b0 vi\u1ec7n OpenSSL, cho ph\u00e9p n\u00f3 truy c\u1eadp v\u00e0o m\u1ed9t lo\u1ea1t c\u00e1c thu\u1eadt to\u00e1n m\u00e3 h\u00f3a c\u1ea5p cao. N\u00f3 th\u01b0\u1eddng s\u1eed d\u1ee5ng m\u00e3 h\u00f3a AES-256, m\u1ed9t ti\u00eau chu\u1ea9n an to\u00e0n \u0111\u1ebfn m\u1ee9c \u0111\u01b0\u1ee3c c\u00e1c ch\u00ednh ph\u1ee7 v\u00e0 t\u1ed5 ch\u1ee9c qu\u00e2n s\u1ef1 tr\u00ean to\u00e0n th\u1ebf gi\u1edbi s\u1eed d\u1ee5ng. Ngo\u00e0i m\u00e3 h\u00f3a \u0111\u01a1n gi\u1ea3n, OpenVPN h\u1ed7 tr\u1ee3 nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p x\u00e1c th\u1ef1c kh\u00e1c nhau, bao g\u1ed3m ch\u1ee9ng ch\u1ec9 s\u1ed1, kh\u00f3a chia s\u1ebb tr\u01b0\u1edbc v\u00e0 x\u00e1c th\u1ef1c \u0111a y\u1ebfu t\u1ed1.<\/p>\n\n\n\n

Tuy nhi\u00ean, s\u1ee9c n\u1eb7ng c\u1ee7a s\u1ef1 \u0111a n\u0103ng n\u00e0y \u0111i k\u00e8m v\u1edbi m\u1ed9t c\u00e1i gi\u00e1 v\u1ec1 hi\u1ec7u su\u1ea5t. OpenVPN s\u1edf h\u1eefu m\u1ed9t c\u01a1 s\u1edf m\u00e3 kh\u1ed5ng l\u1ed3 v\u1edbi h\u01a1n 100.000 d\u00f2ng, khi\u1ebfn n\u00f3 kh\u00f3 b\u1ea3o tr\u00ec v\u00e0 ki\u1ec3m to\u00e1n h\u01a1n \u0111\u00e1ng k\u1ec3 so v\u1edbi c\u00e1c giao th\u1ee9c m\u1edbi h\u01a1n, g\u1ecdn nh\u1eb9 h\u01a1n. Ngo\u00e0i ra, do OpenVPN ho\u1ea1t \u0111\u1ed9ng trong h\u1ec7 \u0111i\u1ec1u h\u00e0nh’s “kh\u00f4ng gian ng\u01b0\u1eddi d\u00f9ng,” n\u00f3 y\u00eau c\u1ea7u nhi\u1ec1u t\u00e0i nguy\u00ean CPU h\u01a1n \u0111\u1ec3 m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3 d\u1eef li\u1ec7u, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn \u0111\u1ed9 tr\u1ec5 cao h\u01a1n v\u00e0 ti\u00eau hao pin nhi\u1ec1u h\u01a1n tr\u00ean c\u00e1c thi\u1ebft b\u1ecb di \u0111\u1ed9ng. M\u1eb7c d\u00f9 b\u1ed9 t\u00ednh n\u0103ng phong ph\u00fa n\u00e0y cho ph\u00e9p “tinh ch\u1ec9nh,” \u1edf m\u1ee9c \u0111\u1ed9 cao, nh\u01b0ng n\u00f3 c\u0169ng t\u1ea1o ra m\u1ed9t \u0111\u01b0\u1eddng cong h\u1ecdc t\u1eadp d\u1ed1c, \u0111\u00f2i h\u1ecfi ki\u1ebfn th\u1ee9c k\u1ef9 thu\u1eadt s\u00e2u h\u01a1n so v\u1edbi c\u00e1c gi\u1ea3i ph\u00e1p thay th\u1ebf hi\u1ec7n \u0111\u1ea1i nh\u01b0 WireGuard. B\u1ea5t ch\u1ea5p nh\u1eefng nh\u01b0\u1ee3c \u0111i\u1ec3m n\u00e0y, OpenVPN v\u1eabn l\u00e0 m\u1ed9t tr\u1ee5 c\u1ed9t quan tr\u1ecdng c\u1ee7a an ninh k\u1ef9 thu\u1eadt s\u1ed1, \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 cao v\u00ec t\u00ednh linh ho\u1ea1t c\u1ef1c k\u1ef3 v\u00e0 hai th\u1eadp k\u1ef7 tin c\u1eady \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng minh tr\u00ean th\u1ef1c t\u1ebf.<\/p>\n\n\n\n

The Reliability and Mobility of IKEv2\/IPsec<\/h2>\n\n\n\n

IKEv2, hay Phi\u00ean b\u1ea3n 2 c\u1ee7a Giao th\u1ee9c Trao \u0111\u1ed5i Kh\u00f3a Internet, l\u00e0 m\u1ed9t giao th\u1ee9c \u0111\u01b0\u1eddng h\u1ea7m m\u1ea1nh m\u1ebd th\u01b0\u1eddng \u0111\u01b0\u1ee3c k\u1ebft h\u1ee3p v\u1edbi IPsec \u0111\u1ec3 m\u00e3 h\u00f3a v\u00e0 x\u00e1c th\u1ef1c. \u0110\u01b0\u1ee3c ph\u00e1t tri\u1ec3n chung b\u1edfi Microsoft v\u00e0 Cisco, n\u00f3 \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t tr\u1ee5 c\u1ed9t trong ng\u00e0nh VPN nh\u1edd kh\u1ea3 n\u0103ng duy tr\u00ec k\u1ebft n\u1ed1i li\u00ean t\u1ee5c trong qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i m\u1ea1ng. Kh\u00f4ng gi\u1ed1ng nh\u01b0 c\u00e1c giao th\u1ee9c c\u0169 c\u00f3 th\u1ec3 l\u00e0m m\u1ea5t k\u1ebft n\u1ed1i khi thi\u1ebft b\u1ecb m\u1ea5t t\u00edn hi\u1ec7u ho\u1eb7c chuy\u1ec3n tr\u1ea1m, IKEv2 c\u00f3 t\u00ednh n\u0103ng “MOBIKE” (Kh\u1ea3 n\u0103ng di \u0111\u1ed9ng v\u00e0 \u0111a \u0111i\u1ec3m). \u0110i\u1ec1u n\u00e0y l\u00e0m cho n\u00f3 \u0111\u1eb7c bi\u1ec7t linh ho\u1ea1t cho ng\u01b0\u1eddi d\u00f9ng di \u0111\u1ed9ng th\u01b0\u1eddng xuy\u00ean chuy\u1ec3n \u0111\u1ed5i gi\u1eefa Wi-Fi v\u00e0 d\u1eef li\u1ec7u di \u0111\u1ed9ng, v\u00ec n\u00f3 c\u00f3 th\u1ec3 thi\u1ebft l\u1eadp l\u1ea1i \u0111\u01b0\u1eddng h\u1ea7m an to\u00e0n g\u1ea7n nh\u01b0 ngay l\u1eadp t\u1ee9c m\u00e0 kh\u00f4ng y\u00eau c\u1ea7u ng\u01b0\u1eddi d\u00f9ng ph\u1ea3i k\u1ebft n\u1ed1i l\u1ea1i th\u1ee7 c\u00f4ng.\n\nT\u1eeb g\u00f3c \u0111\u1ed9 b\u1ea3o m\u1eadt, IKEv2\/IPsec \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 cao nh\u1edd h\u1ed7 tr\u1ee3 m\u00e3 h\u00f3a m\u1ea1nh m\u1ebd v\u00e0 kh\u1ea3 n\u0103ng x\u1eed l\u00fd truy\u1ec1n d\u1eef li\u1ec7u t\u1ed1c \u0111\u1ed9 cao. N\u00f3 s\u1eed d\u1ee5ng b\u1ed9 IPsec \u0111\u1ec3 cung c\u1ea5p m\u1ed9t l\u1edbp b\u1ea3o m\u1eadt cho c\u00e1c g\u00f3i d\u1eef li\u1ec7u, th\u01b0\u1eddng s\u1eed d\u1ee5ng m\u00e3 h\u00f3a AES-256 \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u b\u1ecb ch\u1eb7n v\u1eabn kh\u00f4ng th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c. M\u1ed9t trong nh\u1eefng \u01b0u \u0111i\u1ec3m k\u1ef9 thu\u1eadt ch\u00ednh c\u1ee7a n\u00f3 l\u00e0 th\u01b0\u1eddng \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 nguy\u00ean b\u1ea3n b\u1edfi nhi\u1ec1u h\u1ec7 \u0111i\u1ec1u h\u00e0nh, bao g\u1ed3m Windows, macOS v\u00e0 iOS. S\u1ef1 h\u1ed7 tr\u1ee3 nguy\u00ean b\u1ea3n n\u00e0y c\u00f3 ngh\u0129a l\u00e0 ng\u01b0\u1eddi d\u00f9ng th\u01b0\u1eddng c\u00f3 th\u1ec3 thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i VPN b\u1eb1ng giao th\u1ee9c n\u00e0y m\u00e0 kh\u00f4ng c\u1ea7n c\u00e0i \u0111\u1eb7t ph\u1ea7n m\u1ec1m c\u1ee7a b\u00ean th\u1ee9 ba, mang l\u1ea1i tr\u1ea3i nghi\u1ec7m s\u1ea1ch h\u01a1n v\u00e0 t\u00edch h\u1ee3p h\u01a1n, \u00edt g\u00e2y \u00e1p l\u1ef1c l\u00ean t\u00e0i nguy\u00ean h\u1ec7 th\u1ed1ng c\u1ee7a thi\u1ebft b\u1ecb.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Hi\u1ec7u su\u1ea5t c\u1ee7a IKEv2\/IPsec nh\u00ecn chung v\u01b0\u1ee3t tr\u1ed9i h\u01a1n so v\u1edbi OpenVPN, v\u00ec n\u00f3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 hi\u1ec7u qu\u1ea3 h\u01a1n v\u00e0 \u00edt t\u1ed1n CPU h\u01a1n. M\u1eb7c d\u00f9 c\u00f3 th\u1ec3 kh\u00f4ng \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u1ed1c \u0111\u1ed9 c\u1ef1c cao nh\u01b0 giao th\u1ee9c WireGuard m\u1edbi h\u01a1n, nh\u01b0ng n\u00f3 c\u00e2n b\u1eb1ng tuy\u1ec7t v\u1eddi gi\u1eefa b\u1ea3o m\u1eadt v\u00e0 hi\u1ec7u su\u1ea5t, khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh l\u1ef1a ch\u1ecdn h\u00e0ng \u0111\u1ea7u cho c\u00e1c ho\u1ea1t \u0111\u1ed9ng b\u0103ng th\u00f4ng cao nh\u01b0 ph\u00e1t tr\u1ef1c tuy\u1ebfn ho\u1eb7c truy c\u1eadp t\u1eeb xa an to\u00e0n c\u1ee7a doanh nghi\u1ec7p. Tuy nhi\u00ean, c\u1ea7n l\u01b0u \u00fd r\u1eb1ng IKEv2 \u0111\u00f4i khi c\u00f3 th\u1ec3 d\u1ec5 b\u1ecb t\u01b0\u1eddng l\u1eeda tinh vi ch\u1eb7n h\u01a1n, v\u00ec n\u00f3 th\u01b0\u1eddng s\u1eed d\u1ee5ng m\u1ed9t b\u1ed9 c\u1ed5ng c\u1ee5 th\u1ec3 d\u1ec5 d\u00e0ng \u0111\u01b0\u1ee3c nh\u1eadn d\u1ea1ng b\u1edfi qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng. M\u1eb7c d\u00f9 v\u1eady, s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa t\u1ed1c \u0111\u1ed9, kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch g\u1ed1c v\u00e0 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh kh\u00f4ng \u0111\u1ed1i th\u1ee7 tr\u00ean thi\u1ebft b\u1ecb di \u0111\u1ed9ng v\u1eabn gi\u1eef n\u00f3 \u1edf v\u1ecb tr\u00ed ti\u00ean phong c\u1ee7a c\u00e1c gi\u1ea3i ph\u00e1p m\u1ea1ng hi\u1ec7n \u0111\u1ea1i.<\/p>\n\n\n\n

The Compatibility and Legacy of L2TP\/IPsec<\/h2>\n\n\n\n

Giao th\u1ee9c \u0110\u01b0\u1eddng h\u1ea7m L\u1edbp 2 (L2TP) l\u00e0 ph\u1ea7n m\u1edf r\u1ed9ng c\u1ee7a Giao th\u1ee9c \u0110\u01b0\u1eddng h\u1ea7m \u0110i\u1ec3m-\u0111i\u1ec3m (PPTP) c\u0169 h\u01a1n v\u00e0 h\u1ea7u nh\u01b0 lu\u00f4n \u0111\u01b0\u1ee3c k\u1ebft h\u1ee3p v\u1edbi IPsec \u0111\u1ec3 cung c\u1ea5p t\u00ednh b\u1ea3o m\u1eadt m\u00e0 n\u00f3 thi\u1ebfu m\u1ed9t m\u00ecnh. Trong khi L2TP t\u1ea1o ra \u0111\u01b0\u1eddng h\u1ea7m cho ph\u00e9p d\u1eef li\u1ec7u di chuy\u1ec3n gi\u1eefa hai \u0111i\u1ec3m, IPsec \u0111\u1ea3m nh\u1eadn ph\u1ea7n n\u1eb7ng n\u1ec1 v\u1ec1 m\u00e3 h\u00f3a v\u00e0 x\u00e1c th\u1ef1c. S\u1ef1 k\u1ebft h\u1ee3p n\u00e0y trong nhi\u1ec1u n\u0103m l\u00e0 ti\u00eau chu\u1ea9n cho truy c\u1eadp t\u1eeb xa c\u1ee7a doanh nghi\u1ec7p v\u00e0 v\u1eabn l\u00e0 m\u1ed9t l\u1ef1a ch\u1ecdn t\u01b0\u01a1ng th\u00edch cao ng\u00e0y nay. V\u00ec L2TP\/IPsec \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 g\u1ed1c b\u1edfi h\u1ea7u h\u1ebft m\u1ecdi h\u1ec7 \u0111i\u1ec1u h\u00e0nh hi\u1ec7n \u0111\u1ea1i\u2014t\u1eeb c\u00e1c phi\u00ean b\u1ea3n Windows c\u0169 \u0111\u1ebfn \u0111i\u1ec7n tho\u1ea1i th\u00f4ng minh hi\u1ec7n \u0111\u1ea1i\u2014n\u00f3 th\u01b0\u1eddng l\u00e0 l\u1ef1a ch\u1ecdn h\u00e0ng \u0111\u1ea7u khi ng\u01b0\u1eddi d\u00f9ng c\u1ea7n thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i VPN tr\u00ean thi\u1ebft b\u1ecb m\u00e0 vi\u1ec7c c\u00e0i \u0111\u1eb7t ph\u1ea7n m\u1ec1m b\u00ean th\u1ee9 ba b\u1ecb h\u1ea1n ch\u1ebf ho\u1eb7c kh\u00f4ng th\u1ec3.\n\nT\u1eeb g\u00f3c \u0111\u1ed9 k\u1ef9 thu\u1eadt, quy tr\u00ecnh “\u0111\u00f3ng g\u00f3i k\u00e9p” c\u1ee7a L2TP\/IPsec l\u00e0 \u0111\u1eb7c \u0111i\u1ec3m n\u1ed5i b\u1eadt nh\u1ea5t c\u1ee7a n\u00f3. Trong thi\u1ebft l\u1eadp n\u00e0y, d\u1eef li\u1ec7u tr\u01b0\u1edbc ti\u00ean \u0111\u01b0\u1ee3c b\u1ecdc trong m\u1ed9t g\u00f3i L2TP v\u00e0 sau \u0111\u00f3 \u0111\u01b0\u1ee3c b\u1ecdc l\u1ea1i trong m\u1ed9t g\u00f3i IPsec \u0111\u1ec3 m\u00e3 h\u00f3a. M\u1eb7c d\u00f9 \u0111i\u1ec1u n\u00e0y cung c\u1ea5p m\u1ed9t l\u1edbp b\u1ea3o v\u1ec7 m\u1ea1nh m\u1ebd, n\u00f3 c\u0169ng t\u1ea1o ra chi ph\u00ed \u0111\u00e1ng k\u1ec3. V\u00ec m\u1ecdi m\u1ea9u d\u1eef li\u1ec7u ph\u1ea3i \u0111\u01b0\u1ee3c x\u1eed l\u00fd hai l\u1ea7n, L2TP\/IPsec th\u01b0\u1eddng ch\u1eadm h\u01a1n v\u00e0 t\u1ed1n CPU h\u01a1n so v\u1edbi c\u00e1c giao th\u1ee9c nh\u1eb9 h\u01a1n nh\u01b0 WireGuard ho\u1eb7c IKEv2. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn th\u00f4ng l\u01b0\u1ee3ng th\u1ea5p h\u01a1n v\u00e0 \u0111\u1ed9 tr\u1ec5 cao h\u01a1n, khi\u1ebfn n\u00f3 k\u00e9m l\u00fd t\u01b0\u1edfng h\u01a1n cho c\u00e1c t\u00e1c v\u1ee5 t\u1ed1c \u0111\u1ed9 cao nh\u01b0 ch\u01a1i game ho\u1eb7c ph\u00e1t tr\u1ef1c tuy\u1ebfn 4K, m\u1eb7c d\u00f9 n\u00f3 v\u1eabn ho\u00e0n to\u00e0n \u0111\u1ee7 cho vi\u1ec7c l\u01b0\u1edbt web ti\u00eau chu\u1ea9n v\u00e0 chia s\u1ebb t\u00e0i li\u1ec7u.<\/p>\n\n\n\n

\"How
How L2TP\/IPsec work<\/figcaption><\/figure>\n\n\n\n

M\u1ed9t trong nh\u1eefng th\u00e1ch th\u1ee9c ch\u00ednh v\u1edbi L2TP\/IPsec trong b\u1ed1i c\u1ea3nh m\u1ea1ng hi\u1ec7n \u0111\u1ea1i l\u00e0 kh\u1ea3 n\u0103ng b\u1ecb ch\u1eb7n b\u1edfi t\u01b0\u1eddng l\u1eeda. Giao th\u1ee9c n\u00e0y th\u01b0\u1eddng d\u1ef1a v\u00e0o c\u00e1c c\u1ed5ng c\u1ed1 \u0111\u1ecbnh, nh\u01b0 UDP 500 v\u00e0 UDP 4500, d\u1ec5 d\u00e0ng b\u1ecb x\u00e1c \u0111\u1ecbnh v\u00e0 h\u1ea1n ch\u1ebf b\u1edfi qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng ho\u1eb7c c\u01a1 quan ki\u1ec3m duy\u1ec7t ch\u00ednh ph\u1ee7 s\u1eed d\u1ee5ng Deep Packet Inspection (DPI). Kh\u00f4ng gi\u1ed1ng nh\u01b0 OpenVPN, c\u00f3 th\u1ec3 \u1ea9n l\u01b0u l\u01b0\u1ee3ng c\u1ee7a m\u00ecnh tr\u00ean c\u00e1c c\u1ed5ng web th\u00f4ng th\u01b0\u1eddng, L2TP\/IPsec kh\u00e1 “loud” tr\u00ean m\u1ea1ng v\u00e0 thi\u1ebfu kh\u1ea3 n\u0103ng t\u00e0ng h\u00ecnh. M\u1eb7c d\u00f9 c\u00f3 nh\u1eefng h\u1ea1n ch\u1ebf n\u00e0y v\u00e0 ki\u1ebfn tr\u00fac l\u00e3o h\u00f3a, L2TP\/IPsec v\u1eabn ti\u1ebfp t\u1ee5c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng tr\u00ean to\u00e0n th\u1ebf gi\u1edbi nh\u1edd kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch ph\u1ed5 qu\u00e1t v\u00e0 v\u1ecb th\u1ebf l\u00e0 m\u1ed9t c\u1ef1u binh \u0111\u00e1ng tin c\u1eady, d\u00f9 ch\u1eadm h\u01a1n, c\u1ee7a th\u1ebf gi\u1edbi VPN.<\/p>\n\n\n\n

S\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c giao th\u1ee9c VPN ph\u1ea3n \u00e1nh l\u1ecbch s\u1eed r\u1ed9ng l\u1edbn h\u01a1n c\u1ee7a ch\u00ednh internet\u2014m\u1ed9t s\u1ef1 c\u00e2n b\u1eb1ng li\u00ean t\u1ee5c gi\u1eefa b\u1ea3o m\u1eadt, t\u1ed1c \u0111\u1ed9 v\u00e0 kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch. Trong khi c\u00e1c giao th\u1ee9c k\u1ebf th\u1eeba nh\u01b0 L2TP\/IPsec cung c\u1ea5p c\u1ea7u n\u1ed1i \u0111\u1ebfn ph\u1ea7n c\u1ee9ng c\u0169 h\u01a1n, v\u00e0 OpenVPN v\u1eabn l\u00e0 “Dao qu\u00e2n \u0111\u1ed9i Th\u1ee5y S\u0129” \u0111\u1ec3 v\u01b0\u1ee3t qua ki\u1ec3m duy\u1ec7t, ng\u00e0nh c\u00f4ng nghi\u1ec7p r\u00f5 r\u00e0ng \u0111ang h\u01b0\u1edbng t\u1edbi m\u1ed9t t\u01b0\u01a1ng lai hi\u1ec7u qu\u1ea3 h\u01a1n. IKEv2\/IPsec ti\u1ebfp t\u1ee5c l\u00e0 anh h\u00f9ng cho ng\u01b0\u1eddi d\u00f9ng di \u0111\u1ed9ng c\u1ea7n s\u1ef1 \u1ed5n \u0111\u1ecbnh khi di chuy\u1ec3n, nh\u01b0ng WireGuard \u0111\u00e3 n\u1ed5i l\u00ean nh\u01b0 m\u1ed9t k\u1ebb thay \u0111\u1ed5i cu\u1ed9c ch\u01a1i d\u1ee9t kho\u00e1t. B\u1eb1ng c\u00e1ch k\u1ebft h\u1ee3p m\u1eadt m\u00e3 hi\u1ec7n \u0111\u1ea1i v\u1edbi m\u00e3 ngu\u1ed3n t\u1ed1i gi\u1ea3n, WireGuard ch\u1ee9ng minh r\u1eb1ng m\u1ea1ng an to\u00e0n kh\u00f4ng nh\u1ea5t thi\u1ebft ph\u1ea3i ch\u1eadm ho\u1eb7c ph\u1ee9c t\u1ea1p.\n\nCu\u1ed1i c\u00f9ng, kh\u00f4ng c\u00f3 m\u1ed9t giao th\u1ee9c “t\u1ed1t nh\u1ea5t” duy nh\u1ea5t cho m\u1ecdi t\u00ecnh hu\u1ed1ng; l\u1ef1a ch\u1ecdn \u0111\u00fang \u0111\u1eafn ph\u1ee5 thu\u1ed9c v\u00e0o ph\u1ea7n c\u1ee9ng c\u1ee5 th\u1ec3 c\u1ee7a b\u1ea1n, nhu c\u1ea7u v\u1ec1 t\u1ed1c \u0111\u1ed9 v\u00e0 m\u1ee9c \u0111\u1ed9 ki\u1ec3m duy\u1ec7t b\u1ea1n \u0111ang c\u1ed1 g\u1eafng v\u01b0\u1ee3t qua. Tuy nhi\u00ean, hi\u1ec3u \u0111\u01b0\u1ee3c nh\u1eefng “h\u01b0\u1edbng d\u1eabn s\u1eed d\u1ee5ng” c\u1ee7a \u0111\u01b0\u1eddng h\u1ea7m k\u1ef9 thu\u1eadt s\u1ed1 n\u00e0y cho ph\u00e9p b\u1ea1n ki\u1ec3m so\u00e1t ho\u00e0n to\u00e0n quy\u1ec1n ri\u00eang t\u01b0 v\u00e0 hi\u1ec7u su\u1ea5t tr\u1ef1c tuy\u1ebfn c\u1ee7a m\u00ecnh.<\/p>","protected":false},"excerpt":{"rendered":"

A VPN protocol is a standardized set of rules and instructions that determines exactly how data is transmitted between your device and a VPN server. Think of it as the “instruction manual” for the secure tunnel, defining the precise methods used for encryption, authentication, and data integrity. While the VPN itself establishes the connection, the […]<\/p>\n","protected":false},"author":1,"featured_media":530,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"What is a VPN Protocol?","_seopress_titles_desc":"What is a VPN protocol and which should you choose? Compare WireGuard, OpenVPN, IKEv2, and L2TP to find the perfect balance of speed, security, and stability.","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-524","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-post"],"_links":{"self":[{"href":"https:\/\/rufreevpn.org\/vi\/wp-json\/wp\/v2\/posts\/524","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rufreevpn.org\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rufreevpn.org\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rufreevpn.org\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rufreevpn.org\/vi\/wp-json\/wp\/v2\/comments?post=524"}],"version-history":[{"count":1,"href":"https:\/\/rufreevpn.org\/vi\/wp-json\/wp\/v2\/posts\/524\/revisions"}],"predecessor-version":[{"id":525,"href":"https:\/\/rufreevpn.org\/vi\/wp-json\/wp\/v2\/posts\/524\/revisions\/525"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rufreevpn.org\/vi\/wp-json\/wp\/v2\/media\/530"}],"wp:attachment":[{"href":"https:\/\/rufreevpn.org\/vi\/wp-json\/wp\/v2\/media?parent=524"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rufreevpn.org\/vi\/wp-json\/wp\/v2\/categories?post=524"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rufreevpn.org\/vi\/wp-json\/wp\/v2\/tags?post=524"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}