{"id":476912,"date":"2023-08-09T09:05:02","date_gmt":"2023-08-09T09:05:02","guid":{"rendered":""},"modified":"2023-09-05T11:13:39","modified_gmt":"2023-09-05T11:13:39","slug":"dns-port","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/dns-port\/","title":{"rendered":"c\u1ed5ng DNS"},"content":{"rendered":"<p>H\u1ec7 th\u1ed1ng t\u00ean mi\u1ec1n (DNS) l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng c\u1ee7a Internet gi\u00fap d\u1ecbch c\u00e1c t\u00ean mi\u1ec1n m\u00e0 con ng\u01b0\u1eddi c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c th\u00e0nh \u0111\u1ecba ch\u1ec9 IP, cho ph\u00e9p c\u00e1c thi\u1ebft b\u1ecb \u0111\u1ecbnh v\u1ecb v\u00e0 li\u00ean l\u1ea1c v\u1edbi nhau. DNS s\u1eed d\u1ee5ng nhi\u1ec1u c\u1ed5ng kh\u00e1c nhau cho ho\u1ea1t \u0111\u1ed9ng c\u1ee7a m\u00ecnh, trong \u0111\u00f3 m\u1ed9t trong nh\u1eefng c\u1ed5ng quan tr\u1ecdng nh\u1ea5t l\u00e0 c\u1ed5ng DNS. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang t\u00f4i s\u1ebd \u0111i s\u00e2u v\u00e0o l\u1ecbch s\u1eed, c\u1ea5u tr\u00fac, lo\u1ea1i, c\u00e1ch s\u1eed d\u1ee5ng v\u00e0 quan \u0111i\u1ec3m trong t\u01b0\u01a1ng lai c\u1ee7a c\u1ed5ng DNS, \u0111\u1eb7c bi\u1ec7t l\u00e0 li\u00ean quan \u0111\u1ebfn m\u00e1y ch\u1ee7 proxy.<\/p>\n<h2>L\u1ecbch s\u1eed ngu\u1ed3n g\u1ed1c c\u1ee7a c\u1ed5ng DNS v\u00e0 nh\u1eefng l\u1ea7n \u0111\u1ea7u ti\u00ean nh\u1eafc t\u1edbi n\u00f3<\/h2>\n<p>Giao th\u1ee9c DNS \u0111\u01b0\u1ee3c gi\u1edbi thi\u1ec7u l\u1ea7n \u0111\u1ea7u ti\u00ean v\u00e0o n\u0103m 1983, nh\u01b0ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt cho s\u1ed1 c\u1ed5ng DNS (c\u1ed5ng UDP 53) sau \u0111\u00f3 \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh trong RFC 883 v\u00e0o th\u00e1ng 11 n\u0103m 1983. S\u1ed1 c\u1ed5ng n\u00e0y \u0111\u01b0\u1ee3c g\u00e1n cho DNS cho c\u1ea3 giao th\u1ee9c truy\u1ec1n t\u1ea3i UDP v\u00e0 TCP, cho ph\u00e9p truy v\u1ea5n DNS v\u00e0 c\u00e1c ph\u1ea3n h\u1ed3i s\u1ebd \u0111\u01b0\u1ee3c trao \u0111\u1ed5i qua m\u1ea1ng.<\/p>\n<h2>Th\u00f4ng tin chi ti\u1ebft v\u1ec1 c\u1ed5ng DNS. M\u1edf r\u1ed9ng c\u1ed5ng DNS ch\u1ee7 \u0111\u1ec1.<\/h2>\n<p>C\u1ed5ng DNS ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng hai giao th\u1ee9c truy\u1ec1n t\u1ea3i: UDP (Giao th\u1ee9c g\u00f3i d\u1eef li\u1ec7u ng\u01b0\u1eddi d\u00f9ng) v\u00e0 TCP (Giao th\u1ee9c \u0111i\u1ec1u khi\u1ec3n truy\u1ec1n t\u1ea3i). UDP l\u00e0 giao th\u1ee9c m\u1eb7c \u0111\u1ecbnh v\u00e0 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ph\u1ed5 bi\u1ebfn nh\u1ea5t cho c\u00e1c truy v\u1ea5n DNS, cung c\u1ea5p kh\u1ea3 n\u0103ng li\u00ean l\u1ea1c nhanh h\u01a1n do t\u00ednh ch\u1ea5t kh\u00f4ng k\u1ebft n\u1ed1i c\u1ee7a n\u00f3. M\u1eb7t kh\u00e1c, TCP \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c ph\u1ea3n h\u1ed3i DNS l\u1edbn v\u01b0\u1ee3t qu\u00e1 k\u00edch th\u01b0\u1edbc t\u1ed1i \u0111a c\u1ee7a g\u00f3i UDP ho\u1eb7c khi y\u00eau c\u1ea7u ho\u1ea1t \u0111\u1ed9ng chuy\u1ec3n v\u00f9ng.<\/p>\n<h2>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a c\u1ed5ng DNS. C\u1ed5ng DNS ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o.<\/h2>\n<p>C\u1ed5ng DNS ho\u1ea1t \u0111\u1ed9ng \u1edf l\u1edbp v\u1eadn chuy\u1ec3n c\u1ee7a m\u00f4 h\u00ecnh OSI, t\u1ea1o \u0111i\u1ec1u ki\u1ec7n giao ti\u1ebfp gi\u1eefa l\u1edbp \u1ee9ng d\u1ee5ng (n\u01a1i DNS ho\u1ea1t \u0111\u1ed9ng) v\u00e0 l\u1edbp m\u1ea1ng b\u00ean d\u01b0\u1edbi. Khi m\u00e1y kh\u00e1ch DNS g\u1eedi truy v\u1ea5n \u0111\u1ebfn m\u00e1y ch\u1ee7 DNS, n\u00f3 s\u1ebd s\u1eed d\u1ee5ng c\u1ed5ng 53 l\u00e0m c\u1ed5ng \u0111\u00edch cho c\u1ea3 giao th\u1ee9c UDP v\u00e0 TCP. \u0110\u1ebfn l\u01b0\u1ee3t m\u00e1y ch\u1ee7 DNS s\u1ebd ph\u1ea3n h\u1ed3i l\u1ea1i m\u00e1y kh\u00e1ch b\u1eb1ng c\u1ed5ng ngu\u1ed3n 53.<\/p>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 ph\u00e1c th\u1ea3o \u0111\u01a1n gi\u1ea3n v\u1ec1 quy tr\u00ecnh truy v\u1ea5n DNS:<\/p>\n<ol>\n<li>M\u00e1y kh\u00e1ch DNS g\u1eedi truy v\u1ea5n \u0111\u1ebfn m\u00e1y ch\u1ee7 DNS tr\u00ean c\u1ed5ng 53 (UDP ho\u1eb7c TCP).<\/li>\n<li>M\u00e1y ch\u1ee7 DNS x\u1eed l\u00fd truy v\u1ea5n v\u00e0 ph\u1ea3n h\u1ed3i v\u1edbi th\u00f4ng tin \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u.<\/li>\n<li>M\u00e1y kh\u00e1ch DNS nh\u1eadn \u0111\u01b0\u1ee3c ph\u1ea3n h\u1ed3i tr\u00ean c\u1ed5ng 53.<\/li>\n<\/ol>\n<h2>Ph\u00e2n t\u00edch c\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a c\u1ed5ng DNS.<\/h2>\n<p>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a c\u1ed5ng DNS bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>S\u1ed1 c\u1ed5ng<\/strong>: DNS s\u1eed d\u1ee5ng c\u1ed5ng 53 cho c\u1ea3 giao th\u1ee9c UDP v\u00e0 TCP.<\/li>\n<li><strong>Giao th\u1ee9c v\u1eadn chuy\u1ec3n<\/strong>: N\u00f3 h\u1ed7 tr\u1ee3 giao ti\u1ebfp qua UDP \u0111\u1ec3 truy v\u1ea5n nhanh h\u01a1n v\u00e0 TCP cho ph\u1ea3n h\u1ed3i l\u1edbn ho\u1eb7c chuy\u1ec3n v\u00f9ng.<\/li>\n<li><strong>\u0111\u1ed9 tin c\u1eady<\/strong>: M\u1eb7c d\u00f9 UDP nhanh h\u01a1n nh\u01b0ng l\u1ea1i thi\u1ebfu c\u01a1 ch\u1ebf ki\u1ec3m tra l\u1ed7i, trong khi TCP \u0111\u1ea3m b\u1ea3o vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u \u0111\u00e1ng tin c\u1eady.<\/li>\n<\/ul>\n<h2>C\u00e1c lo\u1ea1i c\u1ed5ng DNS<\/h2>\n<p>Ch\u1ec9 c\u00f3 m\u1ed9t c\u1ed5ng DNS, \u0111\u00f3 l\u00e0 c\u1ed5ng s\u1ed1 53. Tuy nhi\u00ean, c\u00e1ch s\u1eed d\u1ee5ng n\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n th\u00e0nh hai lo\u1ea1i d\u1ef1a tr\u00ean giao th\u1ee9c truy\u1ec1n t\u1ea3i:<\/p>\n<ol>\n<li>\n<p><strong>C\u1ed5ng DNS UDP (UDP\/53)<\/strong>: \u0110\u00e2y l\u00e0 ch\u1ebf \u0111\u1ed9 li\u00ean l\u1ea1c m\u1eb7c \u0111\u1ecbnh v\u00e0 ch\u00ednh cho c\u00e1c truy v\u1ea5n DNS. N\u00f3 nhanh h\u01a1n nh\u01b0ng kh\u00f4ng \u0111\u1ea3m b\u1ea3o vi\u1ec7c cung c\u1ea5p d\u1eef li\u1ec7u \u0111\u00e1ng tin c\u1eady.<\/p>\n<\/li>\n<li>\n<p><strong>C\u1ed5ng DNS TCP (TCP\/53)<\/strong>: TCP \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong tr\u01b0\u1eddng h\u1ee3p d\u1eef li\u1ec7u ph\u1ea3n h\u1ed3i v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n t\u1ed1i \u0111a c\u1ee7a g\u00f3i UDP ho\u1eb7c khi th\u1ef1c hi\u1ec7n chuy\u1ec3n v\u00f9ng.<\/p>\n<\/li>\n<\/ol>\n<p>H\u00e3y t\u00f3m t\u1eaft c\u00e1c lo\u1ea1i trong m\u1ed9t b\u1ea3ng:<\/p>\n<table>\n<thead>\n<tr>\n<th>Ki\u1ec3u<\/th>\n<th>Giao th\u1ee9c<\/th>\n<th>C\u00e1ch s\u1eed d\u1ee5ng<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>C\u1ed5ng DNS UDP<\/td>\n<td>UDP<\/td>\n<td>M\u1eb7c \u0111\u1ecbnh cho truy v\u1ea5n DNS; nhanh h\u01a1n.<\/td>\n<\/tr>\n<tr>\n<td>C\u1ed5ng DNS TCP<\/td>\n<td>TCP<\/td>\n<td>\u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c ph\u1ea3n h\u1ed3i ho\u1eb7c chuy\u1ec3n giao l\u1edbn.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng c\u1ed5ng DNS, c\u00e1c v\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p li\u00ean quan \u0111\u1ebfn vi\u1ec7c s\u1eed d\u1ee5ng<\/h2>\n<h3>C\u00e1c c\u00e1ch s\u1eed d\u1ee5ng c\u1ed5ng DNS<\/h3>\n<p>C\u1ed5ng DNS ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c ho\u1ea1t \u0111\u1ed9ng truy v\u1ea5n v\u00e0 ph\u1ea3n h\u1ed3i DNS gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7. N\u00f3 l\u00e0 m\u1ed9t th\u00e0nh ph\u1ea7n thi\u1ebft y\u1ebfu c\u1ee7a c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng internet, cho ph\u00e9p ph\u00e2n gi\u1ea3i t\u00ean mi\u1ec1n th\u00e0nh \u0111\u1ecba ch\u1ec9 IP.<\/p>\n<h3>C\u00e1c v\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p li\u00ean quan \u0111\u1ebfn vi\u1ec7c s\u1eed d\u1ee5ng<\/h3>\n<ol>\n<li>\n<p><strong>T\u1ea5n c\u00f4ng DNS<\/strong>: DNS d\u1ec5 b\u1ecb t\u1ea5n c\u00f4ng b\u1edfi nhi\u1ec1u cu\u1ed9c t\u1ea5n c\u00f4ng kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0 gi\u1ea3 m\u1ea1o DNS, t\u1ea5n c\u00f4ng DDoS v\u00e0 \u0111\u1ea7u \u0111\u1ed9c b\u1ed9 \u0111\u1ec7m. Vi\u1ec7c tri\u1ec3n khai DNSSEC (Ti\u1ec7n \u00edch m\u1edf r\u1ed9ng b\u1ea3o m\u1eadt DNS) c\u00f3 th\u1ec3 gi\u00fap gi\u1ea3m thi\u1ec3u nh\u1eefng r\u1ee7i ro b\u1ea3o m\u1eadt n\u00e0y.<\/p>\n<\/li>\n<li>\n<p><strong>Qu\u00e1 t\u1ea3i DNS<\/strong>: T\u1ef7 l\u1ec7 truy v\u1ea5n DNS cao ho\u1eb7c ph\u1ea3n h\u1ed3i DNS l\u1edbn c\u00f3 th\u1ec3 l\u00e0m qu\u00e1 t\u1ea3i m\u00e1y ch\u1ee7 DNS. C\u00e2n b\u1eb1ng t\u1ea3i v\u00e0 tri\u1ec3n khai nhi\u1ec1u m\u00e1y ch\u1ee7 h\u01a1n c\u00f3 th\u1ec3 gi\u1ea3i quy\u1ebft \u0111\u01b0\u1ee3c v\u1ea5n \u0111\u1ec1 n\u00e0y.<\/p>\n<\/li>\n<li>\n<p><strong>\u0110\u1ed9 tr\u1ec5 ph\u00e2n gi\u1ea3i DNS<\/strong>: Ph\u1ea3n h\u1ed3i DNS ch\u1eadm c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn th\u1eddi gian t\u1ea3i trang web. L\u01b0u b\u1ea3n ghi DNS c\u1ee5c b\u1ed9 v\u00e0 s\u1eed d\u1ee5ng m\u00e1y ch\u1ee7 DNS nhanh h\u01a1n c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n th\u1eddi gian ph\u00e2n gi\u1ea3i.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 c\u00e1c so s\u00e1nh kh\u00e1c v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1 d\u01b0\u1edbi d\u1ea1ng b\u1ea3ng v\u00e0 danh s\u00e1ch.<\/h2>\n<p>T\u1ea1i \u0111\u00e2y, ch\u00fang t\u00f4i s\u1ebd so s\u00e1nh c\u1ed5ng DNS v\u1edbi c\u00e1c thu\u1eadt ng\u1eef li\u00ean quan kh\u00e1c:<\/p>\n<table>\n<thead>\n<tr>\n<th>Thu\u1eadt ng\u1eef<\/th>\n<th>S\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>C\u1ed5ng DNS (UDP\/53)<\/td>\n<td>C\u1ed5ng \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh cho c\u00e1c truy v\u1ea5n v\u00e0 ph\u1ea3n h\u1ed3i DNS.<\/td>\n<\/tr>\n<tr>\n<td>C\u1ed5ng HTTP (TCP\/80)<\/td>\n<td>C\u1ed5ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp web HTTP kh\u00f4ng \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a ti\u00eau chu\u1ea9n.<\/td>\n<\/tr>\n<tr>\n<td>C\u1ed5ng HTTPS (TCP\/443)<\/td>\n<td>C\u1ed5ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho l\u01b0u l\u01b0\u1ee3ng HTTP an to\u00e0n v\u1edbi SSL\/TLS.<\/td>\n<\/tr>\n<tr>\n<td>C\u1ed5ng FTP (TCP\/21)<\/td>\n<td>C\u1ed5ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c ho\u1ea1t \u0111\u1ed9ng FTP (Giao th\u1ee9c truy\u1ec1n t\u1ec7p).<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Tri\u1ec3n v\u1ecdng v\u00e0 c\u00f4ng ngh\u1ec7 c\u1ee7a t\u01b0\u01a1ng lai li\u00ean quan \u0111\u1ebfn c\u1ed5ng DNS.<\/h2>\n<p>Khi Internet ti\u1ebfp t\u1ee5c ph\u00e1t tri\u1ec3n, giao th\u1ee9c DNS v\u00e0 c\u1ed5ng li\u00ean quan c\u1ee7a n\u00f3 c\u00f3 th\u1ec3 s\u1ebd c\u00f3 nh\u1eefng ti\u1ebfn b\u1ed9 v\u00e0 c\u1ea3i ti\u1ebfn. M\u1ed9t s\u1ed1 ph\u00e1t tri\u1ec3n ti\u1ec1m n\u0103ng trong t\u01b0\u01a1ng lai bao g\u1ed3m:<\/p>\n<ol>\n<li>\n<p><strong>\u00c1p d\u1ee5ng IPv6<\/strong>: V\u1edbi s\u1ef1 c\u1ea1n ki\u1ec7t c\u1ee7a \u0111\u1ecba ch\u1ec9 IPv4, vi\u1ec7c chuy\u1ec3n \u0111\u1ed5i sang IPv6 s\u1ebd tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn h\u01a1n. DNS s\u1ebd c\u1ea7n h\u1ed7 tr\u1ee3 c\u00e1c b\u1ea3n ghi IPv6 v\u00e0 truy v\u1ea5n AAAA.<\/p>\n<\/li>\n<li>\n<p><strong>DNS qua HTTPS (DoH)<\/strong>: DNS qua HTTPS m\u00e3 h\u00f3a l\u01b0u l\u01b0\u1ee3ng DNS, t\u0103ng c\u01b0\u1eddng quy\u1ec1n ri\u00eang t\u01b0 v\u00e0 b\u1ea3o m\u1eadt. N\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng r\u1ed9ng r\u00e3i h\u01a1n, d\u1eabn \u0111\u1ebfn nh\u1eefng thay \u0111\u1ed5i trong m\u1eabu giao ti\u1ebfp DNS.<\/p>\n<\/li>\n<li>\n<p><strong>DNS d\u1ef1a tr\u00ean chu\u1ed7i kh\u1ed1i<\/strong>: Vi\u1ec7c s\u1eed d\u1ee5ng c\u00f4ng ngh\u1ec7 chu\u1ed7i kh\u1ed1i \u0111\u1ec3 qu\u1ea3n l\u00fd DNS c\u00f3 th\u1ec3 t\u1ea1o ra c\u00e1c h\u1ec7 th\u1ed1ng DNS phi t\u1eadp trung v\u00e0 ch\u1ed1ng gi\u1ea3 m\u1ea1o.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng ho\u1eb7c li\u00ean k\u1ebft m\u00e1y ch\u1ee7 proxy v\u1edbi c\u1ed5ng DNS.<\/h2>\n<p>M\u00e1y ch\u1ee7 proxy \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c qu\u1ea3n l\u00fd v\u00e0 t\u1ed1i \u01b0u h\u00f3a c\u00e1c ho\u1ea1t \u0111\u1ed9ng li\u00ean quan \u0111\u1ebfn DNS. Ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi c\u1ed5ng DNS theo nh\u1eefng c\u00e1ch sau:<\/p>\n<ol>\n<li>\n<p><strong>Proxy DNS<\/strong>: M\u1ed9t s\u1ed1 m\u00e1y ch\u1ee7 proxy ho\u1ea1t \u0111\u1ed9ng nh\u01b0 proxy DNS, x\u1eed l\u00fd c\u00e1c truy v\u1ea5n DNS thay m\u1eb7t cho kh\u00e1ch h\u00e0ng. \u0110i\u1ec1u n\u00e0y gi\u00fap c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng b\u1ea3o m\u1eadt, hi\u1ec7u su\u1ea5t v\u00e0 l\u1ecdc.<\/p>\n<\/li>\n<li>\n<p><strong>C\u00e2n b\u1eb1ng t\u1ea3i<\/strong>: M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 ph\u00e2n ph\u1ed1i c\u00e1c truy v\u1ea5n DNS tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7 DNS, h\u1ed7 tr\u1ee3 c\u00e2n b\u1eb1ng t\u1ea3i v\u00e0 \u0111\u1ea3m b\u1ea3o t\u00ednh s\u1eb5n s\u00e0ng cao.<\/p>\n<\/li>\n<li>\n<p><strong>B\u1ed9 nh\u1edb \u0111\u1ec7m<\/strong>: M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 l\u01b0u tr\u1eef c\u00e1c ph\u1ea3n h\u1ed3i DNS, gi\u1ea3m th\u1eddi gian ph\u00e2n gi\u1ea3i v\u00e0 gi\u1ea3m b\u1edbt g\u00e1nh n\u1eb7ng cho c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng DNS.<\/p>\n<\/li>\n<\/ol>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 c\u1ed5ng DNS v\u00e0 c\u00e1c ch\u1ee7 \u0111\u1ec1 li\u00ean quan, b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ol>\n<li><a href=\"https:\/\/tools.ietf.org\/html\/rfc883\" target=\"_new\" rel=\"noopener nofollow\">RFC 883<\/a>: Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt ban \u0111\u1ea7u cho s\u1ed1 c\u1ed5ng DNS.<\/li>\n<li><a href=\"https:\/\/www.cloudflare.com\/learning\/dns\/what-is-dns\/\" target=\"_new\" rel=\"noopener nofollow\">Gi\u1ea3i th\u00edch v\u1ec1 DNS<\/a>: H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 DNS c\u1ee7a Cloudflare.<\/li>\n<li><a href=\"https:\/\/www.icann.org\/dnssec\" target=\"_new\" rel=\"noopener nofollow\">Ti\u1ec7n \u00edch m\u1edf r\u1ed9ng b\u1ea3o m\u1eadt DNS (DNSSEC)<\/a>: Th\u00f4ng tin v\u1ec1 DNSSEC \u0111\u1ec3 t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt DNS.<\/li>\n<\/ol>\n<p>T\u00f3m l\u1ea1i, c\u1ed5ng DNS l\u00e0 m\u1ed9t th\u00e0nh ph\u1ea7n quan tr\u1ecdng c\u1ee7a H\u1ec7 th\u1ed1ng t\u00ean mi\u1ec1n, t\u1ea1o \u0111i\u1ec1u ki\u1ec7n thu\u1eadn l\u1ee3i cho vi\u1ec7c d\u1ecbch t\u00ean mi\u1ec1n th\u00e0nh \u0111\u1ecba ch\u1ec9 IP. V\u1edbi s\u1ef1 li\u00ean k\u1ebft v\u1edbi c\u00e1c m\u00e1y ch\u1ee7 proxy v\u00e0 ti\u1ec1m n\u0103ng ph\u00e1t tri\u1ec3n trong t\u01b0\u01a1ng lai, c\u1ed5ng DNS v\u1eabn l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng trong vi\u1ec7c \u0111\u1ea3m b\u1ea3o tr\u1ea3i nghi\u1ec7m Internet an to\u00e0n v\u00e0 hi\u1ec7u qu\u1ea3.<\/p>","protected":false},"featured_media":476913,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-476912","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>DNS Port: An Encyclopedia Article<\/mark>","faq_items":[{"question":"What is the DNS port, and how does it work?","answer":"<p>The DNS port is a designated port (UDP port 53) used for Domain Name System (DNS) queries and responses. It allows devices to translate human-readable domain names into IP addresses and vice versa. DNS operates using two transport protocols: UDP for faster queries and TCP for large responses or zone transfers.<\/p>"},{"question":"How was the DNS port established, and when was it first defined?","answer":"<p>The DNS protocol was introduced in 1983, and the specification for the DNS port number (UDP port 53) was defined in RFC 883 in November 1983. This assignment ensured that DNS queries and responses could be efficiently exchanged over the network.<\/p>"},{"question":"What are the main features of the DNS port?","answer":"<p>The DNS port (UDP\/53) supports both UDP and TCP transport protocols. UDP is faster but lacks error-checking, while TCP ensures reliable data transmission. The DNS port operates at the transport layer of the OSI model, facilitating communication between the application layer (DNS) and the network layer.<\/p>"},{"question":"Are there different types of DNS ports?","answer":"<p>The DNS port itself is singular (UDP port 53), but its usage can be categorized into two types:<\/p><ol><li>DNS UDP Port (UDP\/53): The default and primary mode for faster DNS queries.<\/li><li>DNS TCP Port (TCP\/53): Used for large responses or zone transfers.<\/li><\/ol>"},{"question":"What are some common issues related to the DNS port's usage?","answer":"<p>Common issues include DNS attacks (e.g., spoofing, DDoS) that can be mitigated with DNSSEC, DNS overload, and resolution delays. Solutions involve load balancing, deploying more servers, and caching DNS records locally.<\/p>"},{"question":"How is the DNS port associated with proxy servers?","answer":"<p>Proxy servers can act as DNS proxies, handling DNS queries on behalf of clients, improving security, performance, and filtering capabilities. They can also perform load balancing, distribute DNS queries, and cache DNS responses to enhance efficiency.<\/p>"},{"question":"What are the future perspectives and technologies related to the DNS port?","answer":"<p>The future of DNS port may involve support for IPv6 records, DNS over HTTPS (DoH) adoption, and exploring blockchain-based DNS systems for decentralization and security enhancements.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476912","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476912\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/476913"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=476912"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}