{"id":476943,"date":"2023-08-09T09:05:36","date_gmt":"2023-08-09T09:05:36","guid":{"rendered":""},"modified":"2023-09-05T11:13:44","modified_gmt":"2023-09-05T11:13:44","slug":"dns-srv-record","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/dns-srv-record\/","title":{"rendered":"B\u1ea3n ghi DNS SRV"},"content":{"rendered":"<p>B\u1ea3n ghi DNS SRV l\u00e0 m\u1ed9t lo\u1ea1i b\u1ea3n ghi d\u1eef li\u1ec7u c\u1ee5 th\u1ec3 trong H\u1ec7 th\u1ed1ng t\u00ean mi\u1ec1n (DNS). N\u00f3 cung c\u1ea5p th\u00f4ng tin v\u1ec1 c\u00e1c d\u1ecbch v\u1ee5 c\u00f3 s\u1eb5n, v\u1ecb tr\u00ed c\u1ee7a ch\u00fang v\u00e0 c\u00e1c giao th\u1ee9c t\u01b0\u01a1ng \u1ee9ng c\u1ee7a ch\u00fang trong c\u00e1c h\u1ec7 th\u1ed1ng v\u00e0 m\u1ea1ng c\u1ee5 th\u1ec3.<\/p>\n<h2>Ngu\u1ed3n g\u1ed1c v\u00e0 \u0111\u1ec1 c\u1eadp ban \u0111\u1ea7u c\u1ee7a b\u1ea3n ghi DNS SRV<\/h2>\n<p>L\u1ecbch s\u1eed c\u1ee7a b\u1ea3n ghi DNS SRV c\u00f3 t\u1eeb nh\u1eefng n\u0103m 1990. N\u00f3 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a l\u1ea7n \u0111\u1ea7u ti\u00ean trong RFC (Y\u00eau c\u1ea7u nh\u1eadn x\u00e9t) 2782, do L\u1ef1c l\u01b0\u1ee3ng \u0111\u1eb7c nhi\u1ec7m k\u1ef9 thu\u1eadt Internet (IETF) xu\u1ea5t b\u1ea3n v\u00e0o th\u00e1ng 2 n\u0103m 2000. N\u00f3 \u0111\u01b0\u1ee3c gi\u1edbi thi\u1ec7u nh\u01b0 m\u1ed9t c\u1ea3i ti\u1ebfn so v\u1edbi h\u1ec7 th\u1ed1ng \u00e1nh x\u1ea1 \u0111\u1ecba ch\u1ec9 IP truy\u1ec1n th\u1ed1ng t\u1edbi t\u00ean m\u00e1y ch\u1ee7, v\u1edbi m\u1ee5c \u0111\u00edch c\u1ee5 th\u1ec3 l\u00e0 cung c\u1ea5p c\u00e1ch ti\u1ebfp c\u1eadn chi ti\u1ebft h\u01a1n \u0111\u1ec3 qu\u1ea3n l\u00fd c\u00e1c d\u1ecbch v\u1ee5 m\u1ea1ng v\u00e0 v\u1ecb tr\u00ed c\u1ee7a ch\u00fang.<\/p>\n<h2>M\u1edf r\u1ed9ng ch\u1ee7 \u0111\u1ec1: B\u1ea3n ghi DNS SRV chi ti\u1ebft<\/h2>\n<p>B\u1ea3n ghi DNS SRV \u0111\u00f3ng vai tr\u00f2 then ch\u1ed1t trong vi\u1ec7c x\u00e1c \u0111\u1ecbnh t\u00ednh kh\u1ea3 d\u1ee5ng v\u00e0 v\u1ecb tr\u00ed c\u1ee7a m\u00e1y ch\u1ee7 (d\u1ecbch v\u1ee5) d\u1ef1a tr\u00ean lo\u1ea1i d\u1ecbch v\u1ee5 v\u00e0 giao th\u1ee9c c\u1ee5 th\u1ec3 trong m\u1ed9t mi\u1ec1n. V\u1ec1 c\u01a1 b\u1ea3n, n\u00f3 l\u00e0 m\u1ed9t b\u1ea3n ghi t\u00e0i nguy\u00ean t\u1ed5ng qu\u00e1t cung c\u1ea5p \u00e1nh x\u1ea1 gi\u1eefa c\u00e1c d\u1ecbch v\u1ee5 v\u00e0 t\u00ean m\u00e1y ch\u1ee7 cung c\u1ea5p c\u00e1c d\u1ecbch v\u1ee5 \u0111\u00f3.<\/p>\n<p>M\u1ed7i b\u1ea3n ghi SRV ch\u1ee9a th\u00f4ng tin v\u1ec1 m\u1ed9t d\u1ecbch v\u1ee5. N\u00f3 bao g\u1ed3m c\u00e1c tr\u01b0\u1eddng d\u1eef li\u1ec7u nh\u01b0:<\/p>\n<ul>\n<li>D\u1ecbch v\u1ee5: T\u00ean c\u1ee7a d\u1ecbch v\u1ee5.<\/li>\n<li>Giao th\u1ee9c: Lo\u1ea1i giao th\u1ee9c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng (th\u01b0\u1eddng l\u00e0 TCP ho\u1eb7c UDP).<\/li>\n<li>T\u00ean: T\u00ean mi\u1ec1n n\u01a1i d\u1ecbch v\u1ee5 \u0111\u01b0\u1ee3c cung c\u1ea5p.<\/li>\n<li>TTL: Th\u1eddi gian t\u1ed3n t\u1ea1i, ch\u1ec9 \u0111\u1ecbnh tu\u1ed5i th\u1ecd c\u1ee7a b\u1ea3n ghi trong b\u1ed9 \u0111\u1ec7m.<\/li>\n<li>L\u1edbp: Tr\u01b0\u1eddng l\u1edbp DNS (th\u01b0\u1eddng l\u00e0 IN cho internet).<\/li>\n<li>M\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean: T\u01b0\u01a1ng t\u1ef1 nh\u01b0 b\u1ea3n ghi trao \u0111\u1ed5i th\u01b0, gi\u00e1 tr\u1ecb th\u1ea5p h\u01a1n bi\u1ec3u th\u1ecb m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean cao h\u01a1n.<\/li>\n<li>Tr\u1ecdng l\u01b0\u1ee3ng: \u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 c\u00e2n b\u1eb1ng t\u1ea3i khi nhi\u1ec1u b\u1ea3n ghi c\u00f3 c\u00f9ng m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean.<\/li>\n<li>C\u1ed5ng: C\u1ed5ng TCP ho\u1eb7c UDP n\u01a1i d\u1ecbch v\u1ee5 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c truy c\u1eadp.<\/li>\n<li>M\u1ee5c ti\u00eau: T\u00ean m\u00e1y ch\u1ee7 chu\u1ea9n c\u1ee7a m\u00e1y cung c\u1ea5p d\u1ecbch v\u1ee5.<\/li>\n<\/ul>\n<h2>T\u00ecm hi\u1ec3u c\u1ea5u tr\u00fac b\u00ean trong v\u00e0 ch\u1ee9c n\u0103ng c\u1ee7a b\u1ea3n ghi DNS SRV<\/h2>\n<p>B\u1ea3n ghi DNS SRV \u0111i\u1ec3n h\u00ecnh \u00e1p d\u1ee5ng \u0111\u1ecbnh d\u1ea1ng sau:<\/p>\n<p><code data-no-translation=\"\">_Service._Proto.Name TTL Class SRV Priority Weight Port Target<\/code><\/p>\n<p>\u1ede \u0111\u00e2u <code data-no-translation=\"\">_Service<\/code> l\u00e0 t\u00ean t\u01b0\u1ee3ng tr\u01b0ng c\u1ee7a d\u1ecbch v\u1ee5, <code data-no-translation=\"\">_Proto<\/code> l\u00e0 giao th\u1ee9c truy\u1ec1n t\u1ea3i \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng (TCP ho\u1eb7c UDP) v\u00e0 <code data-no-translation=\"\">Name<\/code> l\u00e0 t\u00ean mi\u1ec1n. C\u00e1c <code data-no-translation=\"\">TTL<\/code>, <code data-no-translation=\"\">Class<\/code>, <code data-no-translation=\"\">SRV<\/code>, <code data-no-translation=\"\">Priority<\/code>, <code data-no-translation=\"\">Weight<\/code>, <code data-no-translation=\"\">Port<\/code>, V\u00e0 <code data-no-translation=\"\">Target<\/code> t\u1ea5t c\u1ea3 \u0111\u1ec1u nh\u01b0 \u0111\u00e3 m\u00f4 t\u1ea3 \u1edf ph\u1ea7n tr\u01b0\u1edbc.<\/p>\n<p>Khi m\u1ed9t y\u00eau c\u1ea7u d\u1ecbch v\u1ee5 \u0111\u1ebfn m\u1ea1ng, b\u1ea3n ghi DNS SRV cho ph\u00e9p m\u1ea1ng cung c\u1ea5p t\u00ean m\u00e1y ch\u1ee7 v\u00e0 s\u1ed1 c\u1ed5ng c\u1ee7a m\u00e1y ch\u1ee7 cung c\u1ea5p d\u1ecbch v\u1ee5 \u0111\u00f3. Ph\u1ea7n m\u1ec1m c\u1ee7a kh\u00e1ch h\u00e0ng sau \u0111\u00f3 c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng th\u00f4ng tin n\u00e0y \u0111\u1ec3 k\u1ebft n\u1ed1i v\u1edbi m\u00e1y ch\u1ee7 th\u00edch h\u1ee3p.<\/p>\n<h2>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a B\u1ea3n ghi DNS SRV<\/h2>\n<p>M\u1ed9t s\u1ed1 t\u00ednh n\u0103ng quan tr\u1ecdng c\u1ee7a b\u1ea3n ghi DNS SRV khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh m\u1ed9t th\u00e0nh ph\u1ea7n thi\u1ebft y\u1ebfu c\u1ee7a h\u1ec7 th\u1ed1ng m\u1ea1ng:<\/p>\n<ol>\n<li>Kh\u00e1m ph\u00e1 d\u1ecbch v\u1ee5: B\u1ea3n ghi DNS SRV gi\u00fap kh\u00e1ch h\u00e0ng kh\u00e1m ph\u00e1 s\u1ef1 t\u1ed3n t\u1ea1i v\u00e0 v\u1ecb tr\u00ed c\u1ee7a d\u1ecbch v\u1ee5.<\/li>\n<li>C\u00e2n b\u1eb1ng t\u1ea3i: Th\u00f4ng qua tr\u01b0\u1eddng &#039;tr\u1ecdng l\u01b0\u1ee3ng&#039;, b\u1ea3n ghi SRV cho ph\u00e9p c\u00e2n b\u1eb1ng t\u1ea3i \u0111\u01a1n gi\u1ea3n gi\u1eefa nhi\u1ec1u m\u00e1y ch\u1ee7.<\/li>\n<li>C\u01a1 ch\u1ebf chuy\u1ec3n \u0111\u1ed5i d\u1ef1 ph\u00f2ng: Tr\u01b0\u1eddng &#039;\u01b0u ti\u00ean&#039; gi\u00fap thi\u1ebft l\u1eadp c\u01a1 ch\u1ebf chuy\u1ec3n \u0111\u1ed5i d\u1ef1 ph\u00f2ng, h\u01b0\u1edbng l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp \u0111\u1ebfn c\u00e1c m\u00e1y ch\u1ee7 d\u1ef1 ph\u00f2ng n\u1ebfu m\u00e1y ch\u1ee7 ch\u00ednh b\u1ecb l\u1ed7i.<\/li>\n<li>\u0110\u1eb7c t\u1ea3 giao th\u1ee9c: N\u00f3 cho ph\u00e9p \u0111\u1eb7c t\u1ea3 giao th\u1ee9c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng b\u1edfi d\u1ecbch v\u1ee5, tinh ch\u1ec9nh th\u00eam vi\u1ec7c kh\u00e1m ph\u00e1 d\u1ecbch v\u1ee5.<\/li>\n<\/ol>\n<h2>C\u00e1c lo\u1ea1i b\u1ea3n ghi DNS SRV<\/h2>\n<p>M\u1eb7c d\u00f9 kh\u00f4ng c\u00f3 \u201clo\u1ea1i\u201d b\u1ea3n ghi SRV ri\u00eang bi\u1ec7t, nh\u01b0ng c\u00e1c d\u1ecbch v\u1ee5 v\u00e0 giao th\u1ee9c kh\u00e1c nhau c\u00f3 c\u00e1c m\u1ee5c nh\u1eadp b\u1ea3n ghi SRV kh\u00e1c nhau. V\u00ed d\u1ee5: m\u1ed9t s\u1ed1 d\u1ecbch v\u1ee5 ph\u1ed5 bi\u1ebfn s\u1eed d\u1ee5ng b\u1ea3n ghi SRV bao g\u1ed3m:<\/p>\n<ul>\n<li><code data-no-translation=\"\">_sip._tcp.example.com<\/code>: Ch\u1ec9 \u0111\u1ecbnh m\u00e1y ch\u1ee7 cho SIP (Giao th\u1ee9c kh\u1edfi t\u1ea1o phi\u00ean) qua TCP t\u1ea1i example.com.<\/li>\n<li><code data-no-translation=\"\">_imap._tcp.example.com<\/code>: Ch\u1ec9 \u0111\u1ecbnh m\u00e1y ch\u1ee7 IMAP (Giao th\u1ee9c truy c\u1eadp tin nh\u1eafn Internet) qua TCP t\u1ea1i example.com.<\/li>\n<li><code data-no-translation=\"\">_autodiscover._tcp.example.com<\/code>: Ch\u1ec9 \u0111\u1ecbnh m\u00e1y ch\u1ee7 cho t\u00ednh n\u0103ng T\u1ef1 \u0111\u1ed9ng ph\u00e1t hi\u1ec7n qua TCP t\u1ea1i example.com.<\/li>\n<\/ul>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng, th\u00e1ch th\u1ee9c v\u00e0 gi\u1ea3i ph\u00e1p c\u1ee7a b\u1ea3n ghi DNS SRV<\/h2>\n<p>Vi\u1ec7c s\u1eed d\u1ee5ng b\u1ea3n ghi SRV l\u00e0 ph\u1ed5 bi\u1ebfn trong c\u00e1c d\u1ecbch v\u1ee5 kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0 VoIP, IMAP, POP3, SIP v\u00e0 XMPP. B\u1ea3n ghi SRV cung c\u1ea5p th\u00f4ng tin cho kh\u00e1ch h\u00e0ng \u0111\u1ec3 k\u1ebft n\u1ed1i v\u1edbi m\u00e1y ch\u1ee7 th\u00edch h\u1ee3p.<\/p>\n<p>B\u1ea5t ch\u1ea5p t\u00ednh h\u1eefu \u00edch c\u1ee7a ch\u00fang, c\u00e1c b\u1ea3n ghi DNS SRV v\u1eabn ph\u1ea3i \u0111\u1ed1i m\u1eb7t v\u1edbi m\u1ed9t s\u1ed1 th\u00e1ch th\u1ee9c. V\u00ed d\u1ee5: kh\u00f4ng ph\u1ea3i t\u1ea5t c\u1ea3 c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ea7n m\u1ec1m m\u00e1y kh\u00e1ch \u0111\u1ec1u c\u00f3 th\u1ec3 x\u1eed l\u00fd c\u00e1c b\u1ea3n ghi SRV, \u0111i\u1ec1u n\u00e0y l\u00e0m h\u1ea1n ch\u1ebf \u1ee9ng d\u1ee5ng c\u1ee7a ch\u00fang. Ngo\u00e0i ra, vi\u1ec7c c\u1ea5u h\u00ecnh sai c\u00e1c b\u1ea3n ghi n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn gi\u00e1n \u0111o\u1ea1n d\u1ecbch v\u1ee5.<\/p>\n<p>\u0110\u1ec3 gi\u1ea3m thi\u1ec3u nh\u1eefng th\u00e1ch th\u1ee9c n\u00e0y, h\u00e3y \u0111\u1ea3m b\u1ea3o ph\u1ea7n m\u1ec1m m\u00e1y kh\u00e1ch \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng x\u1eed l\u00fd c\u00e1c b\u1ea3n ghi SRV. Vi\u1ec7c ki\u1ec3m tra th\u01b0\u1eddng xuy\u00ean c\u00e1c b\u1ea3n ghi DNS c\u0169ng c\u00f3 th\u1ec3 gi\u00fap ng\u0103n ng\u1eeba v\u00e0 s\u1eeda c\u00e1c c\u1ea5u h\u00ecnh sai.<\/p>\n<h2>\u0110\u1eb7c \u0111i\u1ec3m v\u00e0 so s\u00e1nh c\u1ee7a b\u1ea3n ghi DNS SRV<\/h2>\n<p>B\u1ea3n ghi SRV kh\u00e1c v\u1edbi c\u00e1c lo\u1ea1i b\u1ea3n ghi DNS kh\u00e1c nh\u01b0 b\u1ea3n ghi A, AAAA v\u00e0 CNAME. B\u1ea3n ghi SRV kh\u00f4ng ch\u1ec9 cung c\u1ea5p v\u1ecb tr\u00ed c\u1ee7a d\u1ecbch v\u1ee5 (nh\u01b0 b\u1ea3n ghi A d\u00e0nh cho t\u00ean mi\u1ec1n ho\u1eb7c CNAME d\u00e0nh cho b\u00ed danh) m\u00e0 c\u00f2n cung c\u1ea5p th\u00f4ng tin b\u1ed5 sung nh\u01b0 c\u1ed5ng d\u1ecbch v\u1ee5, m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean v\u00e0 tr\u1ecdng l\u01b0\u1ee3ng.<\/p>\n<p>M\u1ed9t b\u1ea3ng so s\u00e1nh \u0111\u01a1n gi\u1ea3n c\u00f3 th\u1ec3 l\u00e0:<\/p>\n<table>\n<thead>\n<tr>\n<th>Lo\u1ea1i b\u1ea3n ghi DNS<\/th>\n<th>Cung c\u1ea5p IP?<\/th>\n<th>Cung c\u1ea5p c\u1ed5ng?<\/th>\n<th>Cung c\u1ea5p giao th\u1ee9c?<\/th>\n<th>H\u1ed7 tr\u1ee3 \u01b0u ti\u00ean v\u00e0 tr\u1ecdng l\u01b0\u1ee3ng?<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>A\/AAA<\/td>\n<td>\u0110\u00fang<\/td>\n<td>KH\u00d4NG<\/td>\n<td>KH\u00d4NG<\/td>\n<td>KH\u00d4NG<\/td>\n<\/tr>\n<tr>\n<td>CNAME<\/td>\n<td>KH\u00d4NG<\/td>\n<td>KH\u00d4NG<\/td>\n<td>KH\u00d4NG<\/td>\n<td>KH\u00d4NG<\/td>\n<\/tr>\n<tr>\n<td>CHXHCNVN<\/td>\n<td>KH\u00d4NG<\/td>\n<td>\u0110\u00fang<\/td>\n<td>\u0110\u00fang<\/td>\n<td>\u0110\u00fang<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>T\u01b0\u01a1ng lai c\u1ee7a b\u1ea3n ghi DNS SRV<\/h2>\n<p>Vai tr\u00f2 c\u1ee7a b\u1ea3n ghi DNS SRV c\u00f3 th\u1ec3 s\u1ebd tr\u1edf n\u00ean quan tr\u1ecdng h\u01a1n khi c\u00e1c d\u1ecbch v\u1ee5 \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i nhi\u1ec1u h\u01a1n v\u00e0 nhu c\u1ea7u v\u1ec1 c\u01a1 ch\u1ebf ph\u00e1t hi\u1ec7n d\u1ecbch v\u1ee5 v\u00e0 chuy\u1ec3n \u0111\u1ed5i d\u1ef1 ph\u00f2ng t\u0103ng l\u00ean. C\u00e1c c\u00f4ng ngh\u1ec7 trong t\u01b0\u01a1ng lai c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u qu\u1ea3 v\u00e0 \u0111\u1ed9 tin c\u1eady c\u1ee7a c\u00e1c b\u1ea3n ghi SRV, khi\u1ebfn ch\u00fang tr\u1edf th\u00e0nh m\u1ed9t ph\u1ea7n kh\u00f4ng th\u1ec3 thi\u1ebfu trong ki\u1ebfn tr\u00fac m\u1ea1ng hi\u1ec7n \u0111\u1ea1i.<\/p>\n<h2>S\u1ef1 giao thoa gi\u1eefa m\u00e1y ch\u1ee7 proxy v\u00e0 b\u1ea3n ghi DNS SRV<\/h2>\n<p>C\u00e1c m\u00e1y ch\u1ee7 proxy, gi\u1ed1ng nh\u01b0 c\u00e1c m\u00e1y ch\u1ee7 do OneProxy cung c\u1ea5p, c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi c\u00e1c b\u1ea3n ghi DNS SRV. B\u1eb1ng c\u00e1ch \u0111\u01b0a b\u1ea3n ghi SRV cho d\u1ecbch v\u1ee5 proxy v\u00e0o b\u1ea3n ghi DNS c\u1ee7a mi\u1ec1n, kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 t\u1ef1 \u0111\u1ed9ng kh\u00e1m ph\u00e1 s\u1ef1 t\u1ed3n t\u1ea1i c\u1ee7a d\u1ecbch v\u1ee5 proxy v\u00e0 th\u00f4ng tin k\u1ebft n\u1ed1i c\u1ee7a d\u1ecbch v\u1ee5 \u0111\u00f3.<\/p>\n<p>Vi\u1ec7c tri\u1ec3n khai nh\u01b0 v\u1eady cho ph\u00e9p c\u1ea5u h\u00ecnh d\u1ec5 d\u00e0ng h\u01a1n, c\u01a1 ch\u1ebf chuy\u1ec3n \u0111\u1ed5i d\u1ef1 ph\u00f2ng v\u00e0 c\u00e2n b\u1eb1ng t\u1ea3i m\u01b0\u1ee3t m\u00e0 h\u01a1n, c\u1ea3i thi\u1ec7n \u0111\u1ed9 tin c\u1eady v\u00e0 hi\u1ec7u qu\u1ea3 t\u1ed5ng th\u1ec3 c\u1ee7a h\u1ec7 th\u1ed1ng m\u1ea1ng.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin chi ti\u1ebft v\u1ec1 b\u1ea3n ghi DNS SRV, h\u00e3y xem x\u00e9t c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ol>\n<li><a href=\"https:\/\/tools.ietf.org\/html\/rfc2782\" target=\"_new\" rel=\"noopener nofollow\">RFC 2782 \u2013 B\u1ea3n ghi t\u00e0i nguy\u00ean DNS \u0111\u1ec3 ch\u1ec9 \u0111\u1ecbnh v\u1ecb tr\u00ed c\u1ee7a d\u1ecbch v\u1ee5 (DNS SRV)<\/a><\/li>\n<li><a href=\"https:\/\/support.dnsimple.com\/articles\/srv-record\/\" target=\"_new\" rel=\"noopener nofollow\">B\u1ea3n ghi SRV \u2013 DNSimple Tr\u1ee3 gi\u00fap<\/a><\/li>\n<li><a href=\"https:\/\/www.cloudflare.com\/learning\/dns\/dns-records\/dns-srv-record\/\" target=\"_new\" rel=\"noopener nofollow\">S\u1eed d\u1ee5ng b\u1ea3n ghi d\u1ecbch v\u1ee5 DNS (SRV) \u0111\u1ec3 chuy\u1ec3n \u0111\u1ed5i d\u1ef1 ph\u00f2ng<\/a><\/li>\n<li><a href=\"https:\/\/docs.microsoft.com\/en-us\/windows\/win32\/dns\/srv-resource-records\" target=\"_new\" rel=\"noopener nofollow\">B\u1ea3n ghi t\u00e0i nguy\u00ean SRV<\/a><\/li>\n<li><a href=\"https:\/\/www.cloudflare.com\/learning\/dns\/dns-records\/dns-srv-record\/\" target=\"_new\" rel=\"noopener nofollow\">T\u00ecm hi\u1ec3u b\u1ea3n ghi DNS SRV<\/a><\/li>\n<\/ol>","protected":false},"featured_media":476944,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-476943","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Understanding the DNS SRV Record<\/mark>","faq_items":[{"question":"What is a DNS SRV record?","answer":"<p>A DNS SRV record is a specific type of data record in the Domain Name System. It provides information about available services, their locations, and their corresponding protocols within specific systems and networks.<\/p>"},{"question":"When was the DNS SRV record first mentioned?","answer":"<p>The DNS SRV record was first mentioned in the Request for Comments (RFC) 2782, published by the Internet Engineering Task Force (IETF) in February 2000.<\/p>"},{"question":"What information does a DNS SRV record contain?","answer":"<p>A DNS SRV record contains the name of the service, the protocol type, the domain name where the service is offered, Time to Live (TTL), the DNS class field, priority and weight (used for load balancing and failover mechanism), the port where the service can be accessed, and the canonical hostname of the machine providing the service.<\/p>"},{"question":"How does a DNS SRV record work?","answer":"<p>When a service request comes to a network, the DNS SRV record allows the network to provide the hostname and port number of the server offering that service. The client's software can then utilize this information to connect to the appropriate server.<\/p>"},{"question":"How does a DNS SRV record aid in load balancing and establishing a failover mechanism?","answer":"<p>The 'weight' field in the SRV record allows for load balancing among multiple servers. The 'priority' field helps in directing traffic to backup servers if the primary one fails, thus enabling a failover mechanism.<\/p>"},{"question":"Are there different types of DNS SRV records?","answer":"<p>There aren't distinct \"types\" of SRV records. However, different services and protocols have different SRV record entries. Some common services utilizing SRV records include SIP (Session Initiation Protocol), IMAP (Internet Message Access Protocol), and Autodiscover.<\/p>"},{"question":"What challenges are associated with DNS SRV records and how can they be mitigated?","answer":"<p>Challenges associated with DNS SRV records include limited application due to some client software systems not handling SRV records and service disruptions due to misconfigurations. Regular audits of the DNS records and ensuring the client software can handle SRV records can mitigate these issues.<\/p>"},{"question":"How does a DNS SRV record differ from other DNS record types?","answer":"<p>Unlike A, AAAA, and CNAME records, an SRV record provides additional information such as the service port, priority, and weight, in addition to the location of the service.<\/p>"},{"question":"What is the future of DNS SRV records?","answer":"<p>The role of DNS SRV records is likely to become more crucial as services become more distributed, and the need for service discovery and failover mechanisms increases.<\/p>"},{"question":"How can proxy servers like OneProxy be associated with DNS SRV records?","answer":"<p>By including an SRV record for the proxy service in a domain's DNS records, clients can automatically discover the proxy service's existence and its connection information, making configuration easier and improving overall network reliability and efficiency.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476943","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\/476943\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/476944"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=476943"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}