{"id":478314,"date":"2023-08-09T09:30:51","date_gmt":"2023-08-09T09:30:51","guid":{"rendered":""},"modified":"2023-09-05T11:16:30","modified_gmt":"2023-09-05T11:16:30","slug":"packet-capture","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/packet-capture\/","title":{"rendered":"Ch\u1ee5p g\u00f3i"},"content":{"rendered":"

Ch\u1ee5p g\u00f3i, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u0111\u00e1nh h\u01a1i g\u00f3i m\u1ea1ng ho\u1eb7c ph\u00e2n t\u00edch g\u00f3i, l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt c\u01a1 b\u1ea3n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong qu\u1ea3n l\u00fd m\u1ea1ng, ph\u00e2n t\u00edch b\u1ea3o m\u1eadt v\u00e0 x\u1eed l\u00fd s\u1ef1 c\u1ed1. N\u00f3 li\u00ean quan \u0111\u1ebfn vi\u1ec7c thu th\u1eadp v\u00e0 ki\u1ec3m tra c\u00e1c g\u00f3i d\u1eef li\u1ec7u khi ch\u00fang truy\u1ec1n qua m\u1ea1ng m\u00e1y t\u00ednh. Qu\u00e1 tr\u00ecnh n\u00e0y cho ph\u00e9p qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng, chuy\u00ean gia b\u1ea3o m\u1eadt v\u00e0 nh\u00e0 nghi\u00ean c\u1ee9u hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 h\u00e0nh vi m\u1ea1ng, ch\u1ea9n \u0111o\u00e1n s\u1ef1 c\u1ed1 v\u00e0 ph\u00e1t hi\u1ec7n c\u00e1c m\u1ed1i \u0111e d\u1ecda ti\u1ec1m \u1ea9n.<\/p>\n

L\u1ecbch s\u1eed v\u1ec1 ngu\u1ed3n g\u1ed1c c\u1ee7a vi\u1ec7c ch\u1ee5p g\u00f3i v\u00e0 l\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u1ec1 c\u1eadp \u0111\u1ebfn n\u00f3<\/h2>\n

Kh\u00e1i ni\u1ec7m ch\u1ee5p g\u00f3i c\u00f3 t\u1eeb nh\u1eefng ng\u00e0y \u0111\u1ea7u c\u1ee7a m\u1ea1ng m\u00e1y t\u00ednh. Ngu\u1ed3n g\u1ed1c c\u00f3 th\u1ec3 b\u1eaft ngu\u1ed3n t\u1eeb ARPANET, ti\u1ec1n th\u00e2n c\u1ee7a Internet hi\u1ec7n \u0111\u1ea1i, \u0111\u01b0\u1ee3c B\u1ed9 Qu\u1ed1c ph\u00f2ng Hoa K\u1ef3 ph\u00e1t tri\u1ec3n v\u00e0o cu\u1ed1i nh\u1eefng n\u0103m 1960. Trong giai \u0111o\u1ea1n \u0111\u1ea7u, qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng \u0111\u00e3 t\u00ecm c\u00e1ch gi\u00e1m s\u00e1t l\u01b0u l\u01b0\u1ee3ng m\u1ea1ng v\u00ec m\u1ee5c \u0111\u00edch hi\u1ec7u su\u1ea5t v\u00e0 b\u1ea3o m\u1eadt.<\/p>\n

Vi\u1ec7c \u0111\u1ec1 c\u1eadp \u0111\u1ebfn vi\u1ec7c ch\u1ee5p g\u00f3i \u0111\u1ea7u ti\u00ean c\u00f3 th\u1ec3 l\u00e0 do Van Jacobson, ng\u01b0\u1eddi \u0111\u00e3 ph\u00e1t tri\u1ec3n c\u00f4ng c\u1ee5 \u201ctcpdump\u201d v\u00e0o n\u0103m 1987. Tcpdump cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng ch\u1ee5p v\u00e0 hi\u1ec3n th\u1ecb c\u00e1c g\u00f3i TCP\/IP tr\u00ean h\u1ec7 th\u1ed1ng d\u1ef1a tr\u00ean Unix. C\u00f4ng c\u1ee5 ti\u00ean phong n\u00e0y \u0111\u00e3 \u0111\u1eb7t n\u1ec1n m\u00f3ng cho nh\u1eefng ti\u1ebfn b\u1ed9 ti\u1ebfp theo trong vi\u1ec7c thu th\u1eadp v\u00e0 ph\u00e2n t\u00edch g\u00f3i tin.<\/p>\n

Th\u00f4ng tin chi ti\u1ebft v\u1ec1 ch\u1ee5p g\u00f3i. M\u1edf r\u1ed9ng ch\u1ee7 \u0111\u1ec1 Ch\u1ee5p g\u00f3i<\/h2>\n

Ch\u1ee5p g\u00f3i li\u00ean quan \u0111\u1ebfn vi\u1ec7c ch\u1eb7n v\u00e0 ph\u00e2n t\u00edch c\u00e1c g\u00f3i d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n qua m\u1ea1ng. Khi c\u00e1c thi\u1ebft b\u1ecb giao ti\u1ebfp qua m\u1ea1ng, ch\u00fang chia d\u1eef li\u1ec7u th\u00e0nh c\u00e1c g\u00f3i nh\u1ecf tr\u01b0\u1edbc khi truy\u1ec1n ch\u00fang. C\u00e1c g\u00f3i n\u00e0y ch\u1ee9a c\u00e1c ti\u00eau \u0111\u1ec1 c\u00f3 th\u00f4ng tin c\u1ea7n thi\u1ebft nh\u01b0 \u0111\u1ecba ch\u1ec9 ngu\u1ed3n v\u00e0 \u0111\u00edch, chi ti\u1ebft giao th\u1ee9c v\u00e0 d\u1eef li\u1ec7u t\u1ea3i tr\u1ecdng.<\/p>\n

Vi\u1ec7c ch\u1ee5p g\u00f3i th\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c thi\u1ebft b\u1ecb ph\u1ea7n c\u1ee9ng ho\u1eb7c ph\u1ea7n m\u1ec1m chuy\u00ean d\u1ee5ng, th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 tr\u00ecnh thu th\u1eadp g\u00f3i ho\u1eb7c m\u00e1y ph\u00e2n t\u00edch m\u1ea1ng. Nh\u1eefng c\u00f4ng c\u1ee5 n\u00e0y n\u1eafm b\u1eaft c\u00e1c g\u00f3i tin theo th\u1eddi gian th\u1ef1c ho\u1eb7c l\u01b0u tr\u1eef ch\u00fang \u0111\u1ec3 ph\u00e2n t\u00edch sau n\u00e0y. D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c thu th\u1eadp cung c\u1ea5p nh\u1eefng hi\u1ec3u bi\u1ebft c\u00f3 gi\u00e1 tr\u1ecb v\u1ec1 ho\u1ea1t \u0111\u1ed9ng m\u1ea1ng, t\u1eafc ngh\u1ebdn hi\u1ec7u su\u1ea5t v\u00e0 c\u00e1c vi ph\u1ea1m b\u1ea3o m\u1eadt ti\u1ec1m \u1ea9n.<\/p>\n

C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a vi\u1ec7c ch\u1ee5p g\u00f3i. C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a t\u00ednh n\u0103ng ch\u1ee5p g\u00f3i<\/h2>\n

C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a c\u00f4ng c\u1ee5 ch\u1ee5p g\u00f3i c\u00f3 th\u1ec3 kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o ph\u1ea7n m\u1ec1m ho\u1eb7c ph\u1ea7n c\u1ee9ng \u0111ang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. Tuy nhi\u00ean, quy tr\u00ecnh c\u01a1 b\u1ea3n v\u1eabn nh\u1ea5t qu\u00e1n:<\/p>\n

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    Giao di\u1ec7n ch\u1ee5p:<\/strong> Qu\u00e1 tr\u00ecnh ch\u1ee5p g\u00f3i b\u1eaft \u0111\u1ea7u t\u1ea1i giao di\u1ec7n m\u1ea1ng n\u01a1i c\u00e1c g\u00f3i \u0111\u01b0\u1ee3c nh\u1eadn v\u00e0 g\u1eedi. Giao di\u1ec7n ch\u1ee5p c\u00f3 th\u1ec3 l\u00e0 b\u1ed9 \u0111i\u1ec1u h\u1ee3p m\u1ea1ng v\u1eadt l\u00fd ho\u1eb7c giao di\u1ec7n \u1ea3o, ch\u1eb3ng h\u1ea1n nh\u01b0 giao di\u1ec7n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u00f4i tr\u01b0\u1eddng \u1ea3o h\u00f3a.<\/p>\n<\/li>\n

  2. \n

    C\u00f4ng c\u1ee5 ch\u1ee5p g\u00f3i:<\/strong> Th\u00e0nh ph\u1ea7n n\u00e0y ho\u1ea1t \u0111\u1ed9ng \u1edf c\u1ea5p kernel v\u00e0 ch\u1eb7n c\u00e1c g\u00f3i t\u1eeb giao di\u1ec7n ch\u1ee5p. N\u00f3 sao ch\u00e9p c\u00e1c g\u00f3i v\u00e0o b\u1ed9 \u0111\u1ec7m b\u1ed9 nh\u1edb, n\u01a1i ch\u00fang ch\u1edd x\u1eed l\u00fd th\u00eam.<\/p>\n<\/li>\n

  3. \n

    L\u1ecdc v\u00e0 x\u1eed l\u00fd:<\/strong> Ph\u1ea7n m\u1ec1m ch\u1ee5p g\u00f3i \u00e1p d\u1ee5ng c\u00e1c b\u1ed9 l\u1ecdc \u0111\u1ec3 ch\u1ecdn c\u00e1c g\u00f3i c\u1ee5 th\u1ec3 d\u1ef1a tr\u00ean c\u00e1c ti\u00eau ch\u00ed nh\u01b0 \u0111\u1ecba ch\u1ec9 IP ngu\u1ed3n\/\u0111\u00edch, giao th\u1ee9c ho\u1eb7c s\u1ed1 c\u1ed5ng. T\u00ednh n\u0103ng l\u1ecdc gi\u00fap gi\u1ea3m l\u01b0\u1ee3ng d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c thu th\u1eadp, t\u1eadp trung v\u00e0o th\u00f4ng tin li\u00ean quan.<\/p>\n<\/li>\n

  4. \n

    L\u01b0u tr\u1eef v\u00e0 ph\u00e2n t\u00edch:<\/strong> Khi c\u00e1c g\u00f3i mong mu\u1ed1n \u0111\u01b0\u1ee3c thu th\u1eadp v\u00e0 l\u1ecdc, ch\u00fang s\u1ebd \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef \u0111\u1ec3 ph\u00e2n t\u00edch. C\u00e1c nh\u00e0 ph\u00e2n t\u00edch c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng nhi\u1ec1u c\u00f4ng c\u1ee5 kh\u00e1c nhau \u0111\u1ec3 ki\u1ec3m tra n\u1ed9i dung g\u00f3i, x\u00e2y d\u1ef1ng l\u1ea1i c\u00e1c phi\u00ean m\u1ea1ng v\u00e0 x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111i\u1ec3m b\u1ea5t th\u01b0\u1eddng ho\u1eb7c m\u1ed1i \u0111e d\u1ecda b\u1ea3o m\u1eadt.<\/p>\n<\/li>\n<\/ol>\n

    Ph\u00e2n t\u00edch c\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a Packet Capture<\/h2>\n

    Ch\u1ee5p g\u00f3i cung c\u1ea5p m\u1ed9t s\u1ed1 t\u00ednh n\u0103ng ch\u00ednh gi\u00fap n\u00f3 tr\u1edf th\u00e0nh m\u1ed9t c\u00f4ng c\u1ee5 thi\u1ebft y\u1ebfu \u0111\u1ec3 qu\u1ea3n l\u00fd v\u00e0 b\u1ea3o m\u1eadt m\u1ea1ng:<\/p>\n

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      Gi\u00e1m s\u00e1t th\u1eddi gian th\u1ef1c:<\/strong> Ch\u1ee5p g\u00f3i cho ph\u00e9p gi\u00e1m s\u00e1t l\u01b0u l\u01b0\u1ee3ng m\u1ea1ng theo th\u1eddi gian th\u1ef1c, cho ph\u00e9p ph\u1ea3n h\u1ed3i ngay l\u1eadp t\u1ee9c \u0111\u1ed1i v\u1edbi c\u00e1c s\u1ef1 c\u1ed1 m\u1ea1ng ho\u1eb7c s\u1ef1 c\u1ed1 b\u1ea3o m\u1eadt.<\/p>\n<\/li>\n

    2. \n

      Ch\u1ea9n \u0111o\u00e1n v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1:<\/strong> B\u1eb1ng c\u00e1ch ph\u00e2n t\u00edch c\u00e1c g\u00f3i \u0111\u00e3 b\u1eaft, qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c t\u1eafc ngh\u1ebdn v\u1ec1 hi\u1ec7u su\u1ea5t v\u00e0 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 k\u1ebft n\u1ed1i.<\/p>\n<\/li>\n

    3. \n

      Ph\u00e2n t\u00edch b\u1ea3o m\u1eadt:<\/strong> Ch\u1ee5p g\u00f3i h\u1ed7 tr\u1ee3 ph\u00e1t hi\u1ec7n c\u00e1c ho\u1ea1t \u0111\u1ed9ng \u0111\u00e1ng ng\u1edd ho\u1eb7c \u0111\u1ed9c h\u1ea1i trong m\u1ea1ng. N\u00f3 gi\u00fap c\u00e1c chuy\u00ean gia b\u1ea3o m\u1eadt x\u00e1c \u0111\u1ecbnh v\u00e0 gi\u1ea3m thi\u1ec3u c\u00e1c m\u1ed1i \u0111e d\u1ecda ti\u1ec1m \u1ea9n, bao g\u1ed3m c\u00e1c n\u1ed7 l\u1ef1c truy c\u1eadp tr\u00e1i ph\u00e9p v\u00e0 vi ph\u1ea1m d\u1eef li\u1ec7u.<\/p>\n<\/li>\n

    4. \n

      Ph\u00e2n t\u00edch giao th\u1ee9c:<\/strong> V\u1edbi t\u00ednh n\u0103ng ch\u1ee5p g\u00f3i, c\u00e1c chuy\u00ean gia c\u00f3 th\u1ec3 nghi\u00ean c\u1ee9u c\u00e1c giao th\u1ee9c m\u1ea1ng, \u0111\u1ea3m b\u1ea3o tri\u1ec3n khai \u0111\u00fang c\u00e1ch v\u00e0 tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n ng\u00e0nh.<\/p>\n<\/li>\n

    5. \n

      H\u1ed3 s\u01a1 giao th\u00f4ng:<\/strong> D\u1eef li\u1ec7u g\u00f3i \u0111\u00e3 ghi c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u1eadp h\u1ed3 s\u01a1 l\u01b0u l\u01b0\u1ee3ng m\u1ea1ng, hi\u1ec3u c\u00e1c m\u1eabu v\u00e0 t\u1ed1i \u01b0u h\u00f3a t\u00e0i nguy\u00ean m\u1ea1ng.<\/p>\n<\/li>\n<\/ol>\n

      C\u00e1c ki\u1ec3u ch\u1ee5p g\u00f3i<\/h2>\n

      Vi\u1ec7c thu th\u1eadp g\u00f3i c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i d\u1ef1a tr\u00ean c\u00e1c k\u1ef9 thu\u1eadt v\u00e0 v\u1ecb tr\u00ed n\u01a1i d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c thu th\u1eadp. Hai lo\u1ea1i ch\u00ednh l\u00e0:<\/p>\n\n\n\n\n\n\n
      Ki\u1ec3u<\/th>\nS\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n
      Ch\u1ee5p ngo\u1ea1i tuy\u1ebfn<\/strong><\/td>\nTrong ch\u1ebf \u0111\u1ed9 ch\u1ee5p ngo\u1ea1i tuy\u1ebfn, c\u00e1c g\u00f3i \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef trong m\u1ed9t t\u1ec7p \u0111\u1ec3 ph\u00e2n t\u00edch sau. C\u00e1c c\u00f4ng c\u1ee5 nh\u01b0 Wireshark s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p n\u00e0y, cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng t\u1ea3i t\u1ec7p ch\u1ee5p g\u00f3i v\u00e0 ph\u00e2n t\u00edch h\u1ed3i c\u1ee9u.<\/td>\n<\/tr>\n
      Ch\u1ee5p tr\u1ef1c tuy\u1ebfn<\/strong><\/td>\nCh\u1ee5p tr\u1ef1c tuy\u1ebfn, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 ch\u1ee5p th\u1eddi gian th\u1ef1c, li\u00ean quan \u0111\u1ebfn vi\u1ec7c ph\u00e2n t\u00edch c\u00e1c g\u00f3i khi ch\u00fang truy\u1ec1n qua m\u1ea1ng. Ki\u1ec3u ch\u1ee5p n\u00e0y ph\u00f9 h\u1ee3p h\u01a1n \u0111\u1ec3 gi\u00e1m s\u00e1t c\u00e1c ho\u1ea1t \u0111\u1ed9ng m\u1ea1ng \u0111ang di\u1ec5n ra v\u00e0 ph\u00e1t hi\u1ec7n c\u00e1c m\u1ed1i \u0111e d\u1ecda tr\u1ef1c ti\u1ebfp.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      C\u00e1ch s\u1eed d\u1ee5ng Ch\u1ee5p g\u00f3i, 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

      C\u00f4ng d\u1ee5ng c\u1ee7a vi\u1ec7c ch\u1ee5p g\u00f3i:<\/h3>\n
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        Kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 m\u1ea1ng:<\/strong> Khi ph\u00e1t sinh s\u1ef1 c\u1ed1 m\u1ea1ng, qu\u1ea3n tr\u1ecb vi\u00ean c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng t\u00ednh n\u0103ng ch\u1ee5p g\u00f3i \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh ngu\u1ed3n g\u1ed1c c\u1ee7a s\u1ef1 c\u1ed1, ch\u1eb3ng h\u1ea1n nh\u01b0 c\u1ea5u h\u00ecnh sai, t\u1eafc ngh\u1ebdn ho\u1eb7c thi\u1ebft b\u1ecb b\u1ecb l\u1ed7i.<\/p>\n<\/li>\n

      2. \n

        \u0110i\u1ec1u tra an ninh:<\/strong> T\u00ednh n\u0103ng ch\u1ee5p g\u00f3i h\u1ed7 tr\u1ee3 ph\u00e2n t\u00edch \u0111i\u1ec1u tra sau c\u00e1c vi ph\u1ea1m b\u1ea3o m\u1eadt, cho ph\u00e9p c\u00e1c chuy\u00ean gia t\u00e1i t\u1ea1o l\u1ea1i s\u1ef1 c\u1ed1 v\u00e0 hi\u1ec3u c\u00e1c h\u01b0\u1edbng t\u1ea5n c\u00f4ng.<\/p>\n<\/li>\n

      3. \n

        T\u1ed1i \u01b0u h\u00f3a ch\u1ea5t l\u01b0\u1ee3ng d\u1ecbch v\u1ee5 (QoS):<\/strong> B\u1eb1ng c\u00e1ch ph\u00e2n t\u00edch h\u00e0nh vi g\u00f3i, qu\u1ea3n tr\u1ecb vi\u00ean c\u00f3 th\u1ec3 t\u1ed1i \u01b0u h\u00f3a c\u00e0i \u0111\u1eb7t QoS \u0111\u1ec3 \u01b0u ti\u00ean l\u01b0u l\u01b0\u1ee3ng m\u1ea1ng quan tr\u1ecdng.<\/p>\n<\/li>\n<\/ol>\n

        C\u00e1c v\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p th\u01b0\u1eddng g\u1eb7p:<\/h3>\n
          \n
        1. \n

          T\u1ec7p ch\u1ee5p l\u1edbn:<\/strong> Vi\u1ec7c thu th\u1eadp d\u1eef li\u1ec7u qu\u00e1 m\u1ee9c c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn c\u00e1c t\u1ec7p ch\u1ee5p l\u1edbn, khi\u1ebfn vi\u1ec7c ph\u00e2n t\u00edch tr\u1edf n\u00ean c\u1ed3ng k\u1ec1nh. \u0110\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 n\u00e0y, h\u00e3y s\u1eed d\u1ee5ng c\u00e1c b\u1ed9 l\u1ecdc th\u00edch h\u1ee3p \u0111\u1ec3 t\u1eadp trung v\u00e0o c\u00e1c g\u00f3i c\u00f3 li\u00ean quan.<\/p>\n<\/li>\n

        2. \n

          M\u1ed1i quan t\u00e2m v\u1ec1 quy\u1ec1n ri\u00eang t\u01b0:<\/strong> Vi\u1ec7c ch\u1ee5p g\u00f3i c\u00f3 th\u1ec3 v\u00f4 t\u00ecnh thu \u0111\u01b0\u1ee3c d\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m, g\u00e2y lo ng\u1ea1i v\u1ec1 quy\u1ec1n ri\u00eang t\u01b0. \u0110\u1ea3m b\u1ea3o \u1ea9n danh d\u1eef li\u1ec7u th\u00edch h\u1ee3p v\u00e0 tu\u00e2n th\u1ee7 c\u00e1c quy \u0111\u1ecbnh.<\/p>\n<\/li>\n

        3. \n

          T\u00e1c \u0111\u1ed9ng hi\u1ec7u su\u1ea5t:<\/strong> Vi\u1ec7c ch\u1ee5p g\u00f3i chuy\u00ean s\u00e2u c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t m\u1ea1ng. T\u1ed1i \u01b0u h\u00f3a b\u1ed9 l\u1ecdc ch\u1ee5p v\u00e0 s\u1eed d\u1ee5ng c\u00e1c gi\u1ea3i ph\u00e1p t\u0103ng t\u1ed1c ph\u1ea7n c\u1ee9ng \u0111\u1ec3 gi\u1ea3m thi\u1ec3u t\u00e1c \u0111\u1ed9ng n\u00e0y.<\/p>\n<\/li>\n<\/ol>\n

          C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 so s\u00e1nh kh\u00e1c v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1<\/h2>\n\n\n\n\n\n\n\n
          Thu\u1eadt ng\u1eef<\/th>\nS\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n
          \u0110\u00e1nh h\u01a1i g\u00f3i<\/strong><\/td>\n\u0110\u1ed3ng ngh\u0129a v\u1edbi packet capture, packet sniffing l\u00e0 h\u00e0nh \u0111\u1ed9ng ch\u1eb7n v\u00e0 ph\u00e2n t\u00edch c\u00e1c g\u00f3i d\u1eef li\u1ec7u m\u1ea1ng.<\/td>\n<\/tr>\n
          Ki\u1ec3m tra g\u00f3i s\u00e2u (DPI)<\/strong><\/td>\nDPI v\u01b0\u1ee3t xa kh\u1ea3 n\u0103ng thu th\u1eadp g\u00f3i b\u1eb1ng c\u00e1ch ki\u1ec3m tra chuy\u00ean s\u00e2u n\u1ed9i dung g\u00f3i, th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u1ecdc n\u1ed9i dung v\u00e0 \u0111\u1ecbnh h\u00ecnh l\u01b0u l\u01b0\u1ee3ng.<\/td>\n<\/tr>\n
          Khai th\u00e1c m\u1ea1ng<\/strong><\/td>\nKhai th\u00e1c m\u1ea1ng bao g\u1ed3m vi\u1ec7c khai th\u00e1c v\u1eadt l\u00fd v\u00e0o c\u00e1p m\u1ea1ng \u0111\u1ec3 thu th\u1eadp d\u1eef li\u1ec7u, trong khi vi\u1ec7c thu th\u1eadp g\u00f3i c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n kh\u00f4ng x\u00e2m ph\u1ea1m.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          C\u00e1c quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 c\u1ee7a t\u01b0\u01a1ng lai li\u00ean quan \u0111\u1ebfn vi\u1ec7c ch\u1ee5p g\u00f3i<\/h2>\n

          T\u01b0\u01a1ng lai c\u1ee7a vi\u1ec7c ch\u1ee5p g\u00f3i \u0111\u00e3 s\u1eb5n s\u00e0ng cho nh\u1eefng ti\u1ebfn b\u1ed9 th\u00fa v\u1ecb:<\/p>\n

            \n
          1. \n

            T\u1ed1c \u0111\u1ed9 ch\u1ee5p nhanh h\u01a1n:<\/strong> Khi m\u1ea1ng ti\u1ebfp t\u1ee5c ph\u00e1t tri\u1ec3n, c\u00e1c c\u00f4ng c\u1ee5 ch\u1ee5p g\u00f3i s\u1ebd h\u1ed7 tr\u1ee3 t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u cao h\u01a1n, \u0111\u00e1p \u1ee9ng t\u1ed1c \u0111\u1ed9 m\u1ea1ng t\u0103ng l\u00ean.<\/p>\n<\/li>\n

          2. \n

            H\u1ed7 tr\u1ee3 giao th\u1ee9c n\u00e2ng cao:<\/strong> C\u00e1c c\u00f4ng c\u1ee5 trong t\u01b0\u01a1ng lai s\u1ebd \u0111\u01b0\u1ee3c trang b\u1ecb \u0111\u1ec3 x\u1eed l\u00fd c\u00e1c giao th\u1ee9c m\u1edbi n\u1ed5i v\u00e0 \u0111\u1ed9 ph\u1ee9c t\u1ea1p c\u1ee7a ch\u00fang, \u0111\u1ea3m b\u1ea3o ph\u00e2n t\u00edch to\u00e0n di\u1ec7n.<\/p>\n<\/li>\n

          3. \n

            Ph\u00e2n t\u00edch d\u1ef1a tr\u00ean AI:<\/strong> Tr\u00ed tu\u1ec7 nh\u00e2n t\u1ea1o v\u00e0 h\u1ecdc m\u00e1y s\u1ebd \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c t\u1ef1 \u0111\u1ed9ng h\u00f3a ph\u00e2n t\u00edch g\u00f3i v\u00e0 ph\u00e1t hi\u1ec7n m\u1ed1i \u0111e d\u1ecda.<\/p>\n<\/li>\n<\/ol>\n

            C\u00e1ch s\u1eed d\u1ee5ng ho\u1eb7c li\u00ean k\u1ebft m\u00e1y ch\u1ee7 proxy v\u1edbi t\u00ednh n\u0103ng Ch\u1ee5p g\u00f3i<\/h2>\n

            M\u00e1y ch\u1ee7 proxy v\u00e0 ch\u1ee5p g\u00f3i c\u00f3 li\u00ean quan ch\u1eb7t ch\u1ebd v\u1edbi nhau khi gi\u00e1m s\u00e1t v\u00e0 b\u1ea3o m\u1eadt l\u01b0u l\u01b0\u1ee3ng m\u1ea1ng. M\u00e1y ch\u1ee7 proxy \u0111\u00f3ng vai tr\u00f2 trung gian gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 internet, chuy\u1ec3n ti\u1ebfp y\u00eau c\u1ea7u v\u00e0 ph\u1ea3n h\u1ed3i \u0111\u1ed3ng th\u1eddi ghi l\u1ea1i ho\u1ea1t \u0111\u1ed9ng m\u1ea1ng.<\/p>\n

            Vi\u1ec7c t\u00edch h\u1ee3p t\u00ednh n\u0103ng ch\u1ee5p g\u00f3i v\u1edbi m\u00e1y ch\u1ee7 proxy mang l\u1ea1i s\u1ef1 k\u1ebft h\u1ee3p c\u00f3 gi\u00e1 tr\u1ecb cho qu\u1ea3n tr\u1ecb vi\u00ean m\u1ea1ng v\u00e0 chuy\u00ean gia b\u1ea3o m\u1eadt. B\u1eb1ng c\u00e1ch thu th\u1eadp c\u00e1c g\u00f3i \u0111i qua proxy, qu\u1ea3n tr\u1ecb vi\u00ean c\u00f3 th\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 h\u00e0nh vi c\u1ee7a ng\u01b0\u1eddi d\u00f9ng, ph\u00e1t hi\u1ec7n c\u00e1c m\u1ed1i \u0111e d\u1ecda b\u1ea3o m\u1eadt ti\u1ec1m \u1ea9n v\u00e0 \u0111\u1ea3m b\u1ea3o tu\u00e2n th\u1ee7 ch\u00ednh s\u00e1ch.<\/p>\n

            Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n

            \u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 Ch\u1ee5p g\u00f3i, vui l\u00f2ng truy c\u1eadp c\u00e1c li\u00ean k\u1ebft sau:<\/p>\n

              \n
            1. Wireshark \u2013 C\u00f4ng c\u1ee5 ph\u00e2n t\u00edch giao th\u1ee9c m\u1ea1ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i nh\u1ea5t th\u1ebf gi\u1edbi<\/a><\/li>\n
            2. Tcpdump \u2013 Tr\u00ecnh ph\u00e2n t\u00edch g\u00f3i d\u00f2ng l\u1ec7nh m\u1ea1nh m\u1ebd<\/a><\/li>\n
            3. Ki\u1ec3m tra g\u00f3i s\u00e2u \u2013 T\u1ed5ng quan<\/a><\/li>\n<\/ol>\n

              T\u00f3m l\u1ea1i, ch\u1ee5p g\u00f3i l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt c\u01a1 b\u1ea3n v\u00e0 linh ho\u1ea1t \u0111\u1ec3 gi\u00e1m s\u00e1t m\u1ea1ng, x\u1eed l\u00fd s\u1ef1 c\u1ed1 v\u00e0 ph\u00e2n t\u00edch b\u1ea3o m\u1eadt. V\u1edbi nh\u1eefng ti\u1ebfn b\u1ed9 v\u00e0 t\u00edch h\u1ee3p li\u00ean t\u1ee5c v\u1edbi c\u00e1c c\u00f4ng ngh\u1ec7 m\u1edbi n\u1ed5i nh\u01b0 AI v\u00e0 m\u00e1y ch\u1ee7 proxy, vi\u1ec7c ch\u1ee5p g\u00f3i v\u1eabn l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 kh\u00f4ng th\u1ec3 thi\u1ebfu \u0111\u1ec3 hi\u1ec3u v\u00e0 b\u1ea3o v\u1ec7 m\u1ea1ng m\u00e1y t\u00ednh hi\u1ec7n \u0111\u1ea1i.<\/p>","protected":false},"featured_media":0,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-478314","wiki","type-wiki","status-publish","hentry"],"acf":{"faq_title":"Frequently Asked Questions about Packet Capture: A Comprehensive Overview<\/mark>","faq_items":[{"question":"What is Packet capture and why is it important for network management?","answer":"

              Packet capture, also known as network packet sniffing or packet analysis, is the process of capturing and inspecting data packets as they traverse through a computer network. It is essential for network management because it provides real-time monitoring and analysis of network traffic, aiding in diagnosing issues, optimizing performance, and detecting potential security threats.<\/p>"},{"question":"Who first developed the concept of Packet capture?","answer":"

              The concept of packet capture can be attributed to Van Jacobson, who developed the \"tcpdump\" tool in 1987. Tcpdump allowed users to capture and display TCP\/IP packets on a Unix-based system, laying the foundation for subsequent advancements in packet capture and analysis.<\/p>"},{"question":"What are the primary uses of Packet capture?","answer":"

              Packet capture serves various purposes, including:<\/p>