{"id":427,"date":"2025-02-07T11:07:33","date_gmt":"2025-02-07T11:07:33","guid":{"rendered":"https:\/\/replicounts.org\/network\/reverse-dns-lookup\/"},"modified":"2025-02-07T11:07:33","modified_gmt":"2025-02-07T11:07:33","slug":"reverse-dns-lookup","status":"publish","type":"post","link":"https:\/\/replicounts.org\/vi\/network\/reverse-dns-lookup\/","title":{"rendered":"Tra c\u1ee9u DNS ng\u01b0\u1ee3c"},"content":{"rendered":"

Tra c\u1ee9u DNS ng\u01b0\u1ee3c: M\u1ed9t \u0111i\u1ec7u nh\u1ea3y ph\u1ee9c t\u1ea1p trong th\u1ebf gi\u1edbi m\u1ea1ng<\/h3>\n

Trong b\u1ee9c tranh l\u1edbn c\u1ee7a m\u1ea1ng l\u01b0\u1edbi, n\u01a1i m\u1ed7i s\u1ee3i \u0111\u01b0\u1ee3c \u0111an xen t\u1ec9 m\u1ec9 \u0111\u1ec3 t\u1ea1o n\u00ean m\u1ed9t t\u1ed5ng th\u1ec3 m\u1ea1ch l\u1ea1c, Reverse DNS Lookup \u0111\u00f3ng vai tr\u00f2 then ch\u1ed1t. V\u1edbi thi\u00ean h\u01b0\u1edbng v\u1ec1 \u0111\u1ed9 ch\u00ednh x\u00e1c gi\u1ed1ng nh\u01b0 ng\u01b0\u1eddi th\u1ee3 l\u00e0m \u0111\u1ed3ng h\u1ed3 gi\u1ecfi nh\u1ea5t, Reverse DNS d\u1ecbch ng\u01b0\u1ee3c \u0111\u1ecba ch\u1ec9 IP tr\u1edf l\u1ea1i th\u00e0nh t\u00ean mi\u1ec1n m\u00e0 con ng\u01b0\u1eddi c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c, cung c\u1ea5p c\u00e1i nh\u00ecn s\u00e2u s\u1eafc v\u1ec1 danh t\u00ednh c\u1ee7a m\u00e1y \u0111\u1eb1ng sau l\u1edbp v\u1ecf s\u1ed1.<\/p>\n

Tra c\u1ee9u DNS ng\u01b0\u1ee3c l\u00e0 g\u00ec?<\/h4>\n

V\u1ec1 b\u1ea3n ch\u1ea5t, Reverse DNS Lookup (rDNS) l\u00e0 qu\u00e1 tr\u00ecnh truy v\u1ea5n H\u1ec7 th\u1ed1ng t\u00ean mi\u1ec1n (DNS) \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh t\u00ean mi\u1ec1n \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi m\u1ed9t \u0111\u1ecba ch\u1ec9 IP nh\u1ea5t \u0111\u1ecbnh. Qu\u00e1 tr\u00ecnh n\u00e0y s\u1eed d\u1ee5ng m\u1ed9t c\u01a1 ch\u1ebf \u0111\u1ed9c \u0111\u00e1o, kh\u00e1c v\u1edbi tra c\u1ee9u DNS chuy\u1ec3n ti\u1ebfp ti\u00eau chu\u1ea9n, trong \u0111\u00f3 ng\u01b0\u1eddi ta d\u1ecbch t\u00ean mi\u1ec1n th\u00e0nh \u0111\u1ecba ch\u1ec9 IP. Thay v\u00e0o \u0111\u00f3, rDNS th\u1ef1c hi\u1ec7n thao t\u00e1c ng\u01b0\u1ee3c l\u1ea1i, t\u1eadn d\u1ee5ng c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p c\u1ee7a DNS.<\/p>\n

N\u1ec1n t\u1ea3ng k\u1ef9 thu\u1eadt c\u1ee7a Reverse DNS Lookup li\u00ean quan \u0111\u1ebfn vi\u1ec7c t\u1ea1o ra c\u00e1c t\u00ean mi\u1ec1n \u0111\u1eb7c bi\u1ec7t t\u01b0\u01a1ng \u1ee9ng v\u1edbi c\u00e1c \u0111\u1ecba ch\u1ec9 IP. \u0110\u1ed1i v\u1edbi m\u1ed9t \u0111\u1ecba ch\u1ec9 IPv4 nh\u01b0 192.0.2.1<\/code>, truy v\u1ea5n rDNS chuy\u1ec3n \u0111\u1ed5i n\u00f3 th\u00e0nh \u0111\u1ecbnh d\u1ea1ng 1.2.0.192.in-addr.arpa<\/code>. S\u1ef1 chuy\u1ec3n \u0111\u1ed5i n\u00e0y r\u1ea5t quan tr\u1ecdng v\u00ec n\u00f3 cho ph\u00e9p c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng DNS x\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed b\u1ea3n ghi PTR (Con tr\u1ecf) th\u00edch h\u1ee3p ch\u1ee9a t\u00ean mi\u1ec1n th\u1ef1c t\u1ebf \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi \u0111\u1ecba ch\u1ec9 IP \u0111\u00f3.<\/p>\n

T\u01b0\u01a1ng t\u00e1c v\u1edbi Proxy v\u00e0 M\u1ea1ng<\/h4>\n

Trong l\u0129nh v\u1ef1c m\u1ea1ng proxy, n\u01a1i t\u00ednh \u1ea9n danh v\u00e0 t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u01b0u ti\u00ean, Reverse DNS Lookup \u0111\u00f3ng vai tr\u00f2 k\u00e9p. M\u1ed9t m\u1eb7t, n\u00f3 c\u00f3 th\u1ec3 \u0111\u00f3ng vai tr\u00f2 l\u00e0 c\u00f4ng c\u1ee5 \u0111\u1ec3 qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng x\u00e1c minh t\u00ednh x\u00e1c th\u1ef1c c\u1ee7a ngu\u1ed3n l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp \u0111\u1ebfn; m\u1eb7t kh\u00e1c, n\u00f3 c\u00f3 th\u1ec3 ph\u01a1i b\u00e0y b\u1ea3n ch\u1ea5t c\u1ee7a ch\u00ednh c\u00e1c m\u00e1y ch\u1ee7 proxy, c\u00f3 kh\u1ea3 n\u0103ng l\u00e0m t\u1ed5n h\u1ea1i \u0111\u1ebfn t\u00ednh \u1ea9n danh m\u00e0 ch\u00fang h\u01b0\u1edbng \u0111\u1ebfn.<\/p>\n

Khi m\u1ed9t y\u00eau c\u1ea7u \u0111\u01b0\u1ee3c \u0111\u1ecbnh tuy\u1ebfn qua proxy, proxy c\u00f3 th\u1ec3 che gi\u1ea5u \u0111\u1ecba ch\u1ec9 IP g\u1ed1c c\u1ee7a m\u00e1y kh\u00e1ch. Tuy nhi\u00ean, m\u00e1y ch\u1ee7 \u0111\u00edch v\u1eabn c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n tra c\u1ee9u DNS ng\u01b0\u1ee3c tr\u00ean \u0111\u1ecba ch\u1ec9 IP c\u1ee7a proxy. N\u1ebfu k\u1ebft qu\u1ea3 cho th\u1ea5y m\u1ed9t t\u00ean mi\u1ec1n d\u1ec5 nh\u1eadn bi\u1ebft, n\u00f3 c\u00f3 th\u1ec3 v\u00f4 t\u00ecnh ti\u1ebft l\u1ed9 d\u1ecbch v\u1ee5 proxy \u0111ang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng, do \u0111\u00f3 b\u00f3c t\u00e1ch c\u00e1c l\u1edbp \u1ea9n danh. T\u01b0\u01a1ng t\u00e1c n\u00e0y n\u00eau l\u00ean nh\u1eefng c\u00e2n nh\u1eafc quan tr\u1ecdng v\u1ec1 quy\u1ec1n ri\u00eang t\u01b0, b\u1ea3o m\u1eadt v\u00e0 s\u1ef1 tin c\u1eady trong giao ti\u1ebfp tr\u1ef1c tuy\u1ebfn, v\u00ec c\u1ea3 m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7 \u0111\u1ec1u \u0111i\u1ec1u h\u01b0\u1edbng s\u1ef1 ph\u1ee9c t\u1ea1p c\u1ee7a b\u1ed1i c\u1ea3nh k\u1ef9 thu\u1eadt s\u1ed1.<\/p>\n

C\u00e1c tham s\u1ed1 v\u00e0 \u0111\u1ecbnh d\u1ea1ng ch\u00ednh<\/h4>\n

\u0110\u1ec3 \u0111i s\u00e2u h\u01a1n v\u00e0o c\u00e1c kh\u00eda c\u1ea1nh k\u1ef9 thu\u1eadt, ch\u00fang ta ph\u1ea3i xem x\u00e9t c\u00e1c th\u00f4ng s\u1ed1 ch\u00ednh li\u00ean quan \u0111\u1ebfn Tra c\u1ee9u DNS ng\u01b0\u1ee3c:<\/p>\n

    \n
  1. \u0110\u1ecba ch\u1ec9 IP<\/strong>: \u0110i\u1ec3m b\u1eaft \u0111\u1ea7u cho truy v\u1ea5n rDNS. N\u00f3 c\u00f3 th\u1ec3 l\u00e0 \u0111\u1ecba ch\u1ec9 IPv4 ho\u1eb7c IPv6.<\/li>\n
  2. K\u1ef7 l\u1ee5c PTR<\/strong>: M\u1ed9t lo\u1ea1i b\u1ea3n ghi DNS \u00e1nh x\u1ea1 \u0111\u1ecba ch\u1ec9 IP v\u1edbi t\u00ean mi\u1ec1n, t\u1ea1o \u0111i\u1ec1u ki\u1ec7n thu\u1eadn l\u1ee3i cho vi\u1ec7c tra c\u1ee9u ng\u01b0\u1ee3c.<\/li>\n
  3. Truy v\u1ea5n DNS<\/strong>: M\u1ed9t y\u00eau c\u1ea7u chu\u1ea9n h\u00f3a \u0111\u01b0\u1ee3c g\u1eedi \u0111\u1ebfn m\u00e1y ch\u1ee7 DNS \u0111\u1ec3 y\u00eau c\u1ea7u b\u1ea3n ghi PTR \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi \u0111\u1ecba ch\u1ec9 IP \u0111\u01b0\u1ee3c cung c\u1ea5p.<\/li>\n
  4. \u0110\u1ecbnh d\u1ea1ng ph\u1ea3n h\u1ed3i<\/strong>: K\u1ebft qu\u1ea3 c\u1ee7a truy v\u1ea5n, th\u01b0\u1eddng tr\u1ea3 v\u1ec1 t\u00ean mi\u1ec1n n\u1ebfu b\u1ea3n ghi PTR t\u1ed3n t\u1ea1i ho\u1eb7c l\u1ed7i n\u1ebfu kh\u00f4ng c\u00f3.<\/li>\n<\/ol>\n

    \u0110\u1ecbnh d\u1ea1ng cho \u0111\u1ecba ch\u1ec9 IPv4, nh\u01b0 \u0111\u00e3 l\u01b0u \u00fd, l\u00e0 x.x.x.x.in-addr.arpa<\/code>, trong khi \u0111\u1ed1i v\u1edbi IPv6, \u0111\u1ecbnh d\u1ea1ng ph\u1ee9c t\u1ea1p h\u01a1n, s\u1eed d\u1ee5ng bi\u1ec3u di\u1ec5n th\u1eadp l\u1ee5c ph\u00e2n c\u1ee7a \u0111\u1ecba ch\u1ec9, \u0111\u1ea3o ng\u01b0\u1ee3c v\u00e0 th\u00eam h\u1eadu t\u1ed1 .ip6.arpa<\/code>.<\/p>\n

    M\u1ed9t v\u00ed d\u1ee5 c\u01a1 b\u1ea3n: Ngh\u1ec7 thu\u1eadt gi\u1ea3i quy\u1ebft<\/h4>\n

    H\u00e3y xem x\u00e9t, v\u00ed d\u1ee5, \u0111\u1ecba ch\u1ec9 IP 203.0.113.76<\/code>. \u0110\u1ec3 th\u1ef1c hi\u1ec7n Tra c\u1ee9u DNS ng\u01b0\u1ee3c, ch\u00fang t\u00f4i chuy\u1ec3n \u0111\u1ed5i \u0111\u1ecba ch\u1ec9 n\u00e0y th\u00e0nh \u0111\u1ecbnh d\u1ea1ng rDNS:<\/p>\n

    76.113.0.203.in-addr.arpa\n<\/code><\/pre>\n
    Khi th\u1ef1c hi\u1ec7n truy v\u1ea5n DNS cho \u0111\u1ecba ch\u1ec9 n\u00e0y, k\u1ebft qu\u1ea3 s\u1ebd tr\u00f4ng gi\u1ed1ng nh\u01b0 th\u1ebf n\u00e0y:<\/p>\n
    dig -x 203.0.113.76\n<\/code><\/pre>\n
    M\u00e1y ch\u1ee7 DNS ph\u1ea3n h\u1ed3i b\u1eb1ng b\u1ea3n ghi PTR, ti\u1ebft l\u1ed9 t\u00ean mi\u1ec1n \u0111\u01b0\u1ee3c li\u00ean k\u1ebft, c\u00f3 th\u1ec3 l\u00e0 t\u00ean g\u00ec \u0111\u00f3 nh\u01b0 sau:<\/p>\n
    example.com\n<\/code><\/pre>\n
    Ph\u1ea3n h\u1ed3i n\u00e0y kh\u00f4ng ch\u1ec9 l\u00e0m s\u00e1ng t\u1ecf danh t\u00ednh c\u1ee7a m\u00e1y ch\u1ee7 m\u00e0 c\u00f2n g\u1ee3i \u00fd v\u1ec1 vai tr\u00f2 c\u1ee7a n\u00f3 trong m\u1ed9t m\u1ea1ng l\u01b0\u1edbi l\u1edbn h\u01a1n, m\u1ed9t s\u1ef1 t\u01b0\u01a1ng t\u00e1c tinh t\u1ebf gi\u1eefa k\u1ebft n\u1ed1i v\u00e0 nh\u1eadn d\u1ea1ng.<\/p>\n
    K\u1ebft lu\u1eadn: B\u1ee9c tranh l\u1edbn h\u01a1n<\/h4>\n
    Trong k\u1ebf ho\u1ea1ch l\u1edbn c\u1ee7a m\u1ea1ng l\u01b0\u1edbi, Reverse DNS Lookup v\u1eeba l\u00e0 ng\u1ecdn h\u1ea3i \u0111\u0103ng c\u1ee7a s\u1ef1 r\u00f5 r\u00e0ng v\u1eeba l\u00e0 b\u1ee9c m\u00e0n \u1ea9n danh ti\u1ec1m n\u0103ng. T\u01b0\u01a1ng t\u00e1c c\u1ee7a n\u00f3 v\u1edbi c\u00e1c m\u1ea1ng proxy th\u1ec3 hi\u1ec7n s\u1ef1 c\u00e2n b\u1eb1ng tinh t\u1ebf gi\u1eefa t\u00ednh minh b\u1ea1ch v\u00e0 quy\u1ec1n ri\u00eang t\u01b0, l\u00e0m n\u1ed5i b\u1eadt \u0111i\u1ec7u nh\u1ea3y ph\u1ee9c t\u1ea1p l\u00e0m n\u1ec1n t\u1ea3ng cho giao ti\u1ebfp k\u1ef9 thu\u1eadt s\u1ed1. Khi ch\u00fang ta \u0111i qua b\u1ed1i c\u1ea3nh n\u00e0y, \u0111i\u1ec1u quan tr\u1ecdng l\u00e0 ph\u1ea3i lu\u00f4n nh\u1eadn th\u1ee9c \u0111\u01b0\u1ee3c nh\u1eefng h\u00e0m \u00fd m\u00e0 rDNS mang l\u1ea1i, nh\u1eadn ra vai tr\u00f2 k\u00e9p c\u1ee7a n\u00f3 v\u1eeba l\u00e0 c\u00f4ng c\u1ee5 x\u00e1c minh v\u1eeba l\u00e0 kh\u1ea3 n\u0103ng ph\u01a1i b\u00e0y t\u00ednh \u1ea9n danh. Cu\u1ed1i c\u00f9ng, th\u1ebf gi\u1edbi m\u1ea1ng l\u01b0\u1edbi, gi\u1ed1ng nh\u01b0 m\u1ed9t ki\u1ec7t t\u00e1c ki\u1ebfn tr\u00fac \u0111\u01b0\u1ee3c ch\u1ebf t\u00e1c kh\u00e9o l\u00e9o, \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng tr\u00ean c\u00e1c l\u1edbp ph\u1ee9c t\u1ea1p, khi hi\u1ec3u \u0111\u01b0\u1ee3c, s\u1ebd b\u1ed9c l\u1ed9 c\u1ea3 v\u1ebb \u0111\u1eb9p v\u00e0 ch\u1ee9c n\u0103ng.<\/p>","protected":false},"excerpt":{"rendered":"
    Reverse DNS Lookup: An Intricate Dance in the World of Networking In the grand tapestry of networking, where each thread is meticulously woven to create a coherent whole, Reverse DNS Lookup stands as a pivotal player. With a penchant for precision akin to the finest clockmaker, Reverse DNS translates IP addresses back into human-readable domain […]<\/p>\n","protected":false},"author":2,"featured_media":428,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[17],"tags":[21,155,70,156,20,18,157,19,154,104],"class_list":["post-427","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-network","tag-cybersecurity","tag-dns-lookup","tag-dns-records","tag-domain-name","tag-internet-protocol","tag-ip-address","tag-network-tools","tag-networking","tag-reverse-dns","tag-troubleshooting"],"acf":[],"_links":{"self":[{"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/posts\/427","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/comments?post=427"}],"version-history":[{"count":0,"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/posts\/427\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/media\/428"}],"wp:attachment":[{"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/media?parent=427"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/categories?post=427"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/tags?post=427"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}