{"id":402,"date":"2025-02-06T01:18:34","date_gmt":"2025-02-06T01:18:34","guid":{"rendered":"https:\/\/replicounts.org\/network\/dns-leak\/"},"modified":"2025-02-06T01:18:34","modified_gmt":"2025-02-06T01:18:34","slug":"dns-leak","status":"publish","type":"post","link":"https:\/\/replicounts.org\/vi\/network\/dns-leak\/","title":{"rendered":"R\u00f2 r\u1ec9 DNS"},"content":{"rendered":"

R\u00f2 r\u1ec9 DNS: S\u1ef1 c\u1ed1 k\u1ef9 thu\u1eadt trong m\u1ea1ng Proxy<\/h3>\n

R\u00f2 r\u1ec9 DNS l\u00e0 g\u00ec?<\/h4>\n

\u1ede c\u1ea5p \u0111\u1ed9 k\u1ef9 thu\u1eadt, r\u00f2 r\u1ec9 DNS \u0111\u1ec1 c\u1eadp \u0111\u1ebfn vi\u1ec7c v\u00f4 t\u00ecnh \u0111\u1ec3 l\u1ed9 c\u00e1c truy v\u1ea5n DNS cho m\u00e1y ch\u1ee7 DNS c\u1ee7a b\u00ean th\u1ee9 ba, thay v\u00ec \u0111\u1ecbnh tuy\u1ebfn c\u00e1c truy v\u1ea5n \u0111\u00f3 qua \u0111\u01b0\u1eddng h\u1ea7m an to\u00e0n, ch\u1eb3ng h\u1ea1n nh\u01b0 VPN ho\u1eb7c m\u00e1y ch\u1ee7 proxy. Khi ng\u01b0\u1eddi d\u00f9ng k\u1ebft n\u1ed1i v\u1edbi proxy ho\u1eb7c VPN \u0111\u1ec3 che gi\u1ea5u \u0111\u1ecba ch\u1ec9 IP v\u00e0 m\u00e3 h\u00f3a l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp internet c\u1ee7a h\u1ecd, h\u1ecd mong \u0111\u1ee3i r\u1eb1ng t\u1ea5t c\u1ea3 d\u1eef li\u1ec7u c\u1ee7a h\u1ecd, bao g\u1ed3m c\u1ea3 c\u00e1c y\u00eau c\u1ea7u DNS, s\u1ebd \u0111\u01b0\u1ee3c \u0111\u1ecbnh tuy\u1ebfn qua k\u1ebft n\u1ed1i an to\u00e0n \u0111\u00f3. R\u00f2 r\u1ec9 DNS x\u1ea3y ra khi c\u00e1c y\u00eau c\u1ea7u n\u00e0y b\u1ecf qua k\u00eanh an to\u00e0n d\u1ef1 \u0111\u1ecbnh, ti\u1ebft l\u1ed9 ho\u1ea1t \u0111\u1ed9ng duy\u1ec7t web c\u1ee7a ng\u01b0\u1eddi d\u00f9ng cho ISP c\u1ee7a h\u1ecd ho\u1eb7c b\u1ea5t k\u1ef3 k\u1ebb nghe l\u00e9n n\u00e0o kh\u00e1c.<\/p>\n

N\u00f3 t\u01b0\u01a1ng t\u00e1c v\u1edbi Proxy v\u00e0 M\u1ea1ng nh\u01b0 th\u1ebf n\u00e0o?<\/h4>\n

Trong m\u1ed9t m\u1ea1ng th\u00f4ng th\u01b0\u1eddng, khi ng\u01b0\u1eddi d\u00f9ng truy c\u1eadp m\u1ed9t trang web, thi\u1ebft b\u1ecb c\u1ee7a h\u1ecd s\u1ebd th\u1ef1c hi\u1ec7n truy v\u1ea5n DNS \u0111\u1ec3 ph\u00e2n gi\u1ea3i t\u00ean mi\u1ec1n (v\u00ed d\u1ee5: www.example.com) th\u00e0nh \u0111\u1ecba ch\u1ec9 IP. Sau \u0111\u00e2y l\u00e0 c\u00e1ch truy v\u1ea5n DNS t\u01b0\u01a1ng t\u00e1c v\u1edbi proxy:<\/p>\n

    \n
  1. \n

    Thi\u1ebft l\u1eadp m\u00e1y ch\u1ee7 Proxy<\/strong>:Khi ng\u01b0\u1eddi d\u00f9ng k\u1ebft n\u1ed1i v\u1edbi m\u00e1y ch\u1ee7 proxy, l\u00fd t\u01b0\u1edfng nh\u1ea5t l\u00e0 m\u1ecdi l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp, bao g\u1ed3m c\u1ea3 truy v\u1ea5n DNS, \u0111\u1ec1u ph\u1ea3i \u0111\u01b0\u1ee3c g\u1eedi qua proxy n\u00e0y. <\/p>\n<\/li>\n

  2. \n

    Gi\u1ea3i quy\u1ebft DNS<\/strong>: M\u00e1y ch\u1ee7 proxy ph\u1ea3i x\u1eed l\u00fd vi\u1ec7c ph\u00e2n gi\u1ea3i DNS, b\u1eb1ng c\u00e1ch truy v\u1ea5n m\u00e1y ch\u1ee7 DNS c\u1ee7a ri\u00eang n\u00f3 ho\u1eb7c chuy\u1ec3n ti\u1ebfp y\u00eau c\u1ea7u \u0111\u1ebfn m\u00e1y ch\u1ee7 DNS \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh. \u0110i\u1ec1u n\u00e0y gi\u00fap gi\u1eef ri\u00eang t\u01b0 c\u00e1c truy v\u1ea5n DNS c\u1ee7a ng\u01b0\u1eddi d\u00f9ng.<\/p>\n<\/li>\n

  3. \n

    R\u00f2 r\u1ec9 ti\u1ec1m \u1ea9n<\/strong>: N\u1ebfu thi\u1ebft b\u1ecb c\u1ee7a ng\u01b0\u1eddi d\u00f9ng \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh \u0111\u1ec3 s\u1eed d\u1ee5ng tr\u1ef1c ti\u1ebfp m\u00e1y ch\u1ee7 DNS (ch\u1eb3ng h\u1ea1n nh\u01b0 DNS c\u1ee7a ISP) thay v\u00ec DNS c\u1ee7a proxy, c\u00e1c truy v\u1ea5n DNS s\u1ebd b\u1ecb r\u00f2 r\u1ec9 ra ngo\u00e0i proxy. \u0110i\u1ec1u n\u00e0y x\u1ea3y ra n\u1ebfu:<\/p>\n<\/li>\n

  4. \u1ee8ng d\u1ee5ng b\u1ecf qua proxy cho c\u00e1c truy v\u1ea5n DNS.<\/li>\n
  5. Thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh \u0111\u1ec3 s\u1eed d\u1ee5ng m\u00e1y ch\u1ee7 DNS t\u0129nh kh\u00f4ng \u0111\u1ecbnh tuy\u1ebfn qua proxy.<\/li>\n
  6. C\u00e0i \u0111\u1eb7t \u0111\u1ed9 ph\u00e2n gi\u1ea3i DNS kh\u00f4ng \u0111\u00fang ho\u1eb7c c\u1ea5u h\u00ecnh sai.<\/li>\n<\/ol>\n

    C\u00e1c tham s\u1ed1 ho\u1eb7c \u0111\u1ecbnh d\u1ea1ng ch\u00ednh<\/h4>\n
      \n
    1. \u0110\u1ecbnh d\u1ea1ng truy v\u1ea5n DNS<\/strong>: C\u00e1c truy v\u1ea5n DNS tu\u00e2n theo m\u1ed9t \u0111\u1ecbnh d\u1ea1ng c\u1ee5 th\u1ec3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh trong giao th\u1ee9c DNS (RFC 1035). M\u1ed9t g\u00f3i truy v\u1ea5n DNS th\u00f4ng th\u01b0\u1eddng ch\u1ee9a:<\/li>\n
    2. Ti\u00eau \u0111\u1ec1<\/strong>: X\u00e1c \u0111\u1ecbnh truy v\u1ea5n, bao g\u1ed3m c\u1edd cho \u0111\u1ec7 quy v\u00e0 lo\u1ea1i ph\u1ea3n h\u1ed3i.<\/li>\n
    3. Ph\u1ea7n c\u00e2u h\u1ecfi<\/strong>: Bao g\u1ed3m t\u00ean mi\u1ec1n \u0111ang \u0111\u01b0\u1ee3c truy v\u1ea5n v\u00e0 lo\u1ea1i truy v\u1ea5n (A, AAAA, CNAME, v.v.).<\/li>\n
    4. \n

      Ph\u1ea7n tr\u1ea3 l\u1eddi<\/strong>: (n\u1ebfu c\u00f3) Bao g\u1ed3m t\u00ean mi\u1ec1n v\u00e0 \u0111\u1ecba ch\u1ec9 IP \u0111\u00e3 ph\u00e2n gi\u1ea3i.<\/p>\n<\/li>\n

    5. \n

      C\u1ea5u h\u00ecnh Proxy<\/strong>: Proxy c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh \u0111\u1ec3 x\u1eed l\u00fd c\u00e1c y\u00eau c\u1ea7u DNS theo nhi\u1ec1u c\u00e1ch kh\u00e1c nhau:<\/p>\n<\/li>\n

    6. M\u00e1y ch\u1ee7 \u1ee7y quy\u1ec1n SOCKS5<\/strong>: C\u00f3 th\u1ec3 x\u1eed l\u00fd ph\u00e2n gi\u1ea3i DNS \u1edf ph\u00eda m\u00e1y kh\u00e1ch ho\u1eb7c th\u00f4ng qua proxy.<\/li>\n
    7. \n

      M\u00e1y ch\u1ee7 Proxy HTTP<\/strong>: Th\u00f4ng th\u01b0\u1eddng kh\u00f4ng x\u1eed l\u00fd DNS tr\u1ef1c ti\u1ebfp v\u00e0 d\u1ef1a v\u00e0o kh\u1ea3 n\u0103ng ph\u00e2n gi\u1ea3i DNS c\u1ee7a h\u1ec7 th\u1ed1ng m\u00e1y kh\u00e1ch.<\/p>\n<\/li>\n

    8. \n

      C\u1ea5u h\u00ecnh m\u00e1y ch\u1ee7 DNS<\/strong>: Ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 thi\u1ebft l\u1eadp m\u00e1y ch\u1ee7 DNS trong c\u00e0i \u0111\u1eb7t m\u1ea1ng c\u1ee7a h\u1ecd. M\u00e1y ch\u1ee7 DNS ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n<\/li>\n

    9. DNS c\u00f4ng c\u1ed9ng (v\u00ed d\u1ee5: Google Public DNS: 8.8.8.8, Cloudflare: 1.1.1.1)<\/li>\n
    10. DNS c\u1ee7a ISP (c\u00e0i \u0111\u1eb7t m\u1eb7c \u0111\u1ecbnh \u0111i k\u00e8m v\u1edbi d\u1ecbch v\u1ee5 internet)<\/li>\n<\/ol>\n

      V\u00ed d\u1ee5 c\u01a1 b\u1ea3n v\u1edbi gi\u1ea3i th\u00edch k\u1ef9 thu\u1eadt<\/h4>\n

      K\u1ecbch b\u1ea3n<\/strong>:Ng\u01b0\u1eddi d\u00f9ng k\u1ebft n\u1ed1i v\u1edbi d\u1ecbch v\u1ee5 VPN v\u1edbi m\u1ee5c \u0111\u00edch duy\u1ec7t web ri\u00eang t\u01b0.<\/p>\n

        \n
      1. C\u1ea5u h\u00ecnh ng\u01b0\u1eddi d\u00f9ng<\/strong>:<\/li>\n
      2. \n

        Ng\u01b0\u1eddi d\u00f9ng c\u1ea5u h\u00ecnh thi\u1ebft b\u1ecb c\u1ee7a m\u00ecnh \u0111\u1ec3 k\u1ebft n\u1ed1i v\u1edbi VPN, \u0111\u01b0\u1ee3c k\u1ef3 v\u1ecdng s\u1ebd x\u1eed l\u00fd m\u1ecdi l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp, bao g\u1ed3m c\u1ea3 c\u00e1c truy v\u1ea5n DNS.<\/p>\n<\/li>\n

      3. \n

        Quy tr\u00ecnh truy v\u1ea5n DNS<\/strong>:<\/p>\n<\/li>\n

      4. \n

        Ng\u01b0\u1eddi d\u00f9ng nh\u1eadp URL www.example.com<\/code>. Thi\u1ebft b\u1ecb t\u1ea1o m\u1ed9t g\u00f3i truy v\u1ea5n DNS:
        \n Header: {ID: 1234, QR: 0, Opcode: 0, AA: 0, TC: 0, RD: 1, RA: 0, RCODE: 0}
        \n Question: {Name: www.example.com, Type: A}<\/code><\/p>\n<\/li>\n

      5. \n

        H\u00e0nh vi mong \u0111\u1ee3i (Kh\u00f4ng r\u00f2 r\u1ec9)<\/strong>:<\/p>\n<\/li>\n

      6. \n

        Truy v\u1ea5n DNS ph\u1ea3i \u0111\u01b0\u1ee3c g\u1eedi qua \u0111\u01b0\u1eddng h\u1ea7m VPN \u0111\u1ebfn m\u00e1y ch\u1ee7 DNS c\u1ee7a VPN. M\u00e1y ch\u1ee7 gi\u1ea3i quy\u1ebft t\u00ean mi\u1ec1n v\u00e0 g\u1eedi l\u1ea1i \u0111\u1ecba ch\u1ec9 IP:
        \n Answer: {Name: www.example.com, Type: A, Address: 93.184.216.34}<\/code><\/p>\n<\/li>\n

      7. \n

        S\u1ef1 c\u1ed1 r\u00f2 r\u1ec9<\/strong>:<\/p>\n<\/li>\n

      8. N\u1ebfu thi\u1ebft b\u1ecb c\u1ee7a ng\u01b0\u1eddi d\u00f9ng v\u1eabn \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh \u0111\u1ec3 s\u1eed d\u1ee5ng DNS c\u1ee7a ISP (v\u00ed d\u1ee5: 192.0.2.1) thay v\u00ec DNS c\u1ee7a VPN, truy v\u1ea5n DNS s\u1ebd \u0111\u01b0\u1ee3c g\u1eedi tr\u1ef1c ti\u1ebfp \u0111\u1ebfn ISP:
        \n Query sent to: 192.0.2.1<\/code><\/li>\n
      9. ISP gi\u1ea3i quy\u1ebft truy v\u1ea5n v\u00e0 bi\u1ebft ng\u01b0\u1eddi d\u00f9ng \u0111\u00e3 truy c\u1eadp www.example.com<\/code>, ngay c\u1ea3 khi ch\u00fang \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi VPN.<\/li>\n<\/ol>\n

        Ph\u1ea7n k\u1ebft lu\u1eadn<\/h4>\n

        R\u00f2 r\u1ec9 DNS c\u00f3 th\u1ec3 l\u00e0m suy y\u1ebfu \u0111\u00e1ng k\u1ec3 quy\u1ec1n ri\u00eang t\u01b0 v\u00e0 b\u1ea3o m\u1eadt m\u00e0 c\u00e1c m\u1ea1ng proxy v\u00e0 VPN h\u01b0\u1edbng \u0111\u1ebfn. \u0110\u1ec3 ng\u0103n ch\u1eb7n r\u00f2 r\u1ec9 DNS, ng\u01b0\u1eddi d\u00f9ng n\u00ean \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c truy v\u1ea5n DNS c\u1ee7a h\u1ecd \u0111\u01b0\u1ee3c \u0111\u1ecbnh tuy\u1ebfn qua m\u00e1y ch\u1ee7 DNS c\u1ee7a proxy ho\u1eb7c VPN. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1ecbnh c\u1ea5u h\u00ecnh trong c\u00e0i \u0111\u1eb7t c\u1ee7a VPN ho\u1eb7c b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c t\u00ednh n\u0103ng b\u1ea3o v\u1ec7 r\u00f2 r\u1ec9 DNS do nhi\u1ec1u d\u1ecbch v\u1ee5 VPN cung c\u1ea5p. Ngo\u00e0i ra, ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng c\u1ee5 \u0111\u1ec3 ki\u1ec3m tra r\u00f2 r\u1ec9 DNS v\u00e0 x\u00e1c minh r\u1eb1ng c\u00e1c truy v\u1ea5n DNS c\u1ee7a h\u1ecd l\u00e0 an to\u00e0n.<\/p>","protected":false},"excerpt":{"rendered":"

        DNS Leak: Technical Breakdown in Proxy Networks What is DNS Leak? At a technical level, a DNS leak refers to the unintended exposure of DNS queries to a third-party DNS server, rather than routing those queries through a secure tunnel, such as a VPN or a proxy server. When a user connects to a proxy […]<\/p>\n","protected":false},"author":1,"featured_media":403,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[17],"tags":[21,80,83,75,76,79,81,78,77,82],"class_list":["post-402","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-network","tag-cybersecurity","tag-data-leakage","tag-digital-privacy","tag-dns-leak","tag-internet-security","tag-network-protection","tag-online-anonymity","tag-privacy","tag-vpn","tag-web-browsing"],"acf":[],"_links":{"self":[{"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/posts\/402","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\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/comments?post=402"}],"version-history":[{"count":0,"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/posts\/402\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/media\/403"}],"wp:attachment":[{"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/media?parent=402"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/categories?post=402"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/replicounts.org\/vi\/wp-json\/wp\/v2\/tags?post=402"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}