{"id":9829,"date":"2019-10-01T17:57:25","date_gmt":"2019-10-01T10:57:25","guid":{"rendered":""},"modified":"2025-03-26T16:57:34","modified_gmt":"2025-03-26T09:57:34","slug":"syn-flood-attack-ddos-la-gi-cach-thuc-phong-chong","status":"publish","type":"post","link":"https:\/\/vnso.vn\/en\/syn-flood-attack-ddos-la-gi-cach-thuc-phong-chong\/","title":{"rendered":"SYN flood attack DDoS l\u00e0 g\u00ec ? C\u00e1ch th\u1ee9c ph\u00f2ng ch\u1ed1ng!"},"content":{"rendered":"<p style=\"text-align: justify;\"><span style=\"color: #000000;\">SYN Flood attack DDoS khai th\u00e1c t\u1eeb l\u1ed7 h\u1ed5ng b\u00ean trong TCP\/ IP. B\u1eaft tay nhau trong vi\u1ec7c t\u1ea5n c\u00f4ng ph\u00e1 v\u1ee1 m\u1ed9t d\u1ecbch v\u1ee5 web.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>1. Cu\u1ed9c t\u1ea5n c\u00f4ng SYN Flood l\u00e0 g\u00ec?<\/strong><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">SYN flood (half-open attack) l\u00e0 m\u1ed9t ki\u1ec3u t\u1ea5n c\u00f4ng t\u1eeb ch\u1ed1i d\u1ecbch v\u1ee5 (DDos). T\u1ea5n c\u00f4ng n\u00e0y v\u1edbi m\u1ee5c \u0111\u00edch l\u00e0m cho Server kh\u00f4ng c\u00f3 l\u01b0u l\u01b0\u1ee3ng \u0111\u1ec3 truy c\u1eadp h\u1ee3p ph\u00e1p. B\u1eb1ng c\u00e1ch ti\u00eau th\u1ee5 t\u1ea5t c\u1ea3 t\u00e0i nguy\u00ean server \u0111ang c\u00f3 s\u1eb5n. Ng\u01b0\u1eddi t\u1ea5n c\u00f4ng c\u00f3 th\u1ec3 \u00e1p \u0111\u1ea3o t\u1ea5t c\u1ea3 c\u00e1c c\u1ed5ng tr\u00ean <a style=\"color: #000000;\" href=\"https:\/\/vnso.vn\/en\/thue-may-chu-rieng\/\">Server<\/a>. L\u00e0m cho thi\u1ebft b\u1ecb Client \u0111\u00e1p \u1ee9ng l\u01b0u l\u01b0\u1ee3ng h\u1ee3p ph\u00e1p m\u1ed9t c\u00e1ch ch\u1eadm ch\u1ea1p.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>2. L\u00e0m th\u1ebf n\u00e0o t\u1ea5n c\u00f4ng SYN Flood ?<\/strong><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">M\u1ed9t cu\u1ed9c t\u1ea5n c\u00f4ng DDoS SYN-flood t\u1eadn d\u1ee5ng quy tr\u00ecnh b\u1eaft tay ba chi\u1ec1u TCP. Trong \u0111i\u1ec1u ki\u1ec7n b\u00ecnh th\u01b0\u1eddng, k\u1ebft n\u1ed1i TCP \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n quy tr\u00ecnh 3 b\u01b0\u1edbc ri\u00eang bi\u1ec7t \u0111\u1ec3 t\u1ea1o \u0111\u01b0\u1ee3c s\u1ef1 k\u1ebft n\u1ed1i nh\u01b0 sau:<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong><u>1.<\/u><\/strong>\u00a0\u0110\u1ea7u ti\u00ean, m\u00e1y t\u1ea5n c\u00f4ng g\u1eedi 1 packet tin SYN \u0111\u1ebfn Server \u0111\u1ec3 y\u00eau c\u1ea7u k\u1ebft n\u1ed1i.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong><u>2.<\/u><\/strong> Sau khi ti\u1ebfp nh\u1eadn packet SYN, Server ph\u1ea3n h\u1ed3i l\u1ea1i m\u00e1y kh\u00e1ch b\u1eb1ng m\u1ed9t packet SYN\/ACK, \u0111\u1ec3 x\u00e1c nh\u1eadn th\u00f4ng tin t\u1eeb Client.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong><u>3.<\/u><\/strong>\u00a0Cu\u1ed1i c\u00f9ng, Client nh\u1eadn \u0111\u01b0\u1ee3c packet tin SYN\/ACK th\u00ec s\u1ebd tr\u1ea3 l\u1eddi server b\u1eb1ng packet tin ACK b\u00e1o v\u1edbi server bi\u1ebft r\u1eb1ng n\u00f3 \u0111\u00e3 nh\u1eadn \u0111\u01b0\u1ee3c packet tin SYN\/ACK, k\u1ebft n\u1ed1i \u0111\u00e3 \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp v\u00e0 s\u1eb5n s\u00e0ng trao \u0111\u1ed5i d\u1eef li\u1ec7u.<\/span><\/p>\n<div id=\"attachment_7111\" style=\"width: 671px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" aria-describedby=\"caption-attachment-7111\" class=\"size-full wp-image-7111\" src=\"http:\/\/vnso.vn\/wp-content\/uploads\/2019\/10\/8.jpg\" alt=\"SYN flood attack\" width=\"661\" height=\"438\" \/><p id=\"caption-attachment-7111\" class=\"wp-caption-text\"><em>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 SYN flood attack<\/em><\/p><\/div>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">\u0110\u1ec3 t\u1ea1o t\u1eeb ch\u1ed1i d\u1ecbch v\u1ee5 (DOS), th\u1ef1c t\u1ebf k\u1ebb t\u1ea5n c\u00f4ng s\u1ebd khai th\u00e1c sau khi nh\u1eadn \u0111\u01b0\u1ee3c packet SYN ban \u0111\u1ea7u t\u1eeb Client. Server s\u1ebd ph\u1ea3n h\u1ed3i l\u1ea1i 1 ho\u1eb7c nhi\u1ec1u packet SYN\/ACK v\u00e0 ch\u1edd \u0111\u1ebfn b\u01b0\u1edbc cu\u1ed1i c\u00f9ng trong qu\u00e1 tr\u00ecnh Handshake. <\/span><\/p>\n<h3 style=\"text-align: justify;\"><span style=\"color: #000000;\">C\u00e1ch th\u1ee9c th\u1ef1c hi\u1ec7n c\u1ee7a n\u00f3 nh\u01b0 sau:<\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>B\u01b0\u1edbc 1:<\/strong> K\u1ebb t\u1ea5n c\u00f4ng s\u1ebd g\u1eedi m\u1ed9t kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn c\u00e1c packet tin SYN \u0111\u1ebfn Server. \u0110\u01b0\u1ee3c nh\u1eafm l\u00e0 m\u1ee5c ti\u00eau v\u00e0 th\u01b0\u1eddng l\u00e0 c\u00e1c \u0111\u1ecba ch\u1ec9 IP gi\u1ea3 m\u1ea1o.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>B\u01b0\u1edbc 2:<\/strong> Sau \u0111\u00f3 Server s\u1ebd ph\u1ea3n h\u1ed3i l\u1ea1i t\u1eebng y\u00eau c\u1ea7u k\u1ebft n\u1ed1i. \u0110\u1ec3 l\u1ea1i 1 c\u1ed5ng m\u1edf s\u1eb5n s\u00e0ng ti\u1ebfp nh\u1eadn v\u00e0 ph\u1ea3n h\u1ed3i.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>B\u01b0\u1edbc 3:<\/strong> Trong khi Server ch\u1edd packet ACK \u1edf b\u01b0\u1edbc cu\u1ed1i c\u00f9ng t\u1eeb Client, packet m\u00e0 kh\u00f4ng bao gi\u1edd \u0111\u1ebfn. K\u1ebb t\u1ea5n c\u00f4ng ti\u1ebfp t\u1ee5c g\u1eedi th\u00eam c\u00e1c packet SYN. S\u1ef1 xu\u1ea5t hi\u1ec7n c\u00e1c packet SYN m\u1edbi khi\u1ebfn <a style=\"color: #000000;\" href=\"https:\/\/vnso.vn\/en\/thue-may-chu-rieng\/\">m\u00e1y ch\u1ee7<\/a> t\u1ea1m th\u1eddi duy tr\u00ec k\u1ebft n\u1ed1i c\u1ed5ng m\u1edf m\u1edbi trong m\u1ed9t th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh. M\u1ed9t khi c\u00e1c c\u1ed5ng c\u00f3 s\u1eb5n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng th\u00ec Server kh\u00f4ng th\u1ec3 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 b\u00ecnh th\u01b0\u1eddng.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Trong k\u1ebft n\u1ed1i m\u1ea1ng, khi Server b\u00ean n\u00e0y k\u1ebft n\u1ed1i m\u1edf nh\u01b0ng m\u00e1y b\u00ean kia kh\u00f4ng k\u1ebft n\u1ed1i th\u00ec \u0111\u01b0\u1ee3c coi l\u00e0 half-open. Trong ki\u1ec3u t\u1ea5n c\u00f4ng DDos, sau khi server g\u1eedi g\u00f3i tin SYN\/ACK n\u00f3 s\u1ebd ph\u1ea3i \u0111\u1ee3i cho \u0111\u1ebfn khi client tr\u1ea3 l\u1eddi. \u0110\u1ebfn khi c\u00e1c port tr\u1edf l\u1ea1i b\u00ecnh th\u01b0\u1eddng. K\u1ebft qu\u1ea3 c\u1ee7a ki\u1ec3u t\u1ea5n c\u00f4ng n\u00e0y \u0111\u01b0\u1ee3c coi l\u00e0 cu\u1ed9c t\u1ea5n c\u00f4ng half-open.<\/span><\/p>\n<div id=\"attachment_7112\" style=\"width: 671px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-7112\" class=\"size-full wp-image-7112\" src=\"http:\/\/vnso.vn\/wp-content\/uploads\/2019\/10\/9.jpg\" alt=\"SYN flood attack\" width=\"661\" height=\"438\" \/><p id=\"caption-attachment-7112\" class=\"wp-caption-text\"><em>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 SYN flood attack<\/em><\/p><\/div>\n<h2 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>3. SYN Flood( half-open) c\u00f3 th\u1ec3 x\u1ea3y ra theo 3 c\u00e1ch kh\u00e1c nhau<\/strong><\/span><\/h2>\n<h3 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>3.1. T\u1ea5n c\u00f4ng tr\u1ef1c ti\u1ebfp<\/strong><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">SYN Flood \u1edf nh\u1eefng n\u01a1i \u0111\u1ecba ch\u1ec9 IP kh\u00f4ng b\u1ecb gi\u1ea3 m\u1ea1o th\u00ec \u0111\u01b0\u1ee3c coi l\u00e0 t\u1ea5n c\u00f4ng tr\u1ef1c ti\u1ebfp. Trong cu\u1ed9c t\u1ea5n c\u00f4ng n\u00e0y, k\u1ebb t\u1ea5n c\u00f4ng kh\u00f4ng ho\u00e0n to\u00e0n gi\u1ea5u \u0111\u1ecba ch\u1ec9 IP c\u1ee7a h\u1ecd. K\u1ebft qu\u1ea3 l\u00e0 k\u1ebb t\u1ea5n c\u00f4ng s\u1eed d\u1ee5ng duy nh\u1ea5t 1 thi\u1ebft b\u1ecb ngu\u1ed3n c\u00f3 \u0111\u1ecba ch\u1ec9 IP th\u1ef1c \u0111\u1ec3 t\u1ea1o cu\u1ed9c t\u1ea5n c\u00f4ng. K\u1ebb t\u1ea5n c\u00f4ng r\u1ea5t d\u1ec5 b\u1ecb ph\u00e1t hi\u1ec7n v\u00e0 gi\u1ea3m nh\u1eb9. \u0110\u1ec3 t\u1ea1o tr\u1ea1ng th\u00e1i half-open tr\u00ean Server m\u1ee5c ti\u00eau, hacker ng\u0103n ch\u1eb7n m\u00e1y c\u1ee7a h\u1ecd ph\u1ea3n \u1ee9ng v\u1edbi packet tin SYN\/ACK c\u1ee7a Server. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u1ea1t \u0111\u01b0\u1ee3c nh\u1edd quy t\u1eafc t\u01b0\u1eddng l\u1eeda ng\u0103n ch\u1eb7n c\u00e1c packet tin \u0111i ra ngo\u00e0i. <\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Packet tin SYN ho\u1eb7c ch\u1ecdn l\u1ecdc ra b\u1ea5t k\u1ef3 packet tin SYN\/ACK xu\u1ea5t hi\u1ec7n tr\u01b0\u1edbc khi ch\u00fang \u1ea3nh h\u01b0\u1edfng nh\u1eefng \u0111\u1ed9c h\u1ea1i \u0111\u1ebfn m\u00e1y ng\u01b0\u1eddi d\u00f9ng. Th\u1ef1c t\u1ebf th\u00ec c\u00e1ch n\u00e0y \u00edt s\u1eed d\u1ee5ng (n\u1ebfu c\u00f3), vi\u1ec7c gi\u1ea3m thi\u1ec3u c\u0169ng kh\u00e1 \u0111\u01a1n gi\u1ea3n &#8211; ch\u1ec9 c\u1ea7n ch\u1eb7n \u0111\u1ecba ch\u1ec9 IP c\u1ee7a t\u1eebng h\u1ec7 th\u1ed1ng \u0111\u1ed9c h\u1ea1i. N\u1ebfu k\u1ebb t\u1ea5n c\u00f4ng \u0111ang s\u1eed d\u1ee5ng Botnet nh\u01b0 Mirai Botnet th\u00ec h\u1ecd s\u1ebd th\u00e0nh c\u00f4ng trong vi\u1ec7c che gi\u1ea5u \u0111\u1ecba ch\u1ec9 IP c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb nhi\u1ec5m b\u1ec7nh.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>3.2. T\u1ea5n c\u00f4ng gi\u1ea3 m\u1ea1o<\/strong><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">M\u1ed9t ng\u01b0\u1eddi d\u00f9ng c\u00f3 \u00e1c t\u00e2m c\u0169ng c\u00f3 th\u1ec3 gi\u1ea3 m\u1ea1o \u0111\u1ecba ch\u1ec9 IP tr\u00ean m\u1ed7i packet tin SYN h\u1ecd g\u1eedi \u0111i \u0111\u1ec3 ng\u0103n ch\u1eb7n, gi\u1ea3m thi\u1ec3u t\u1ed1i \u0111a v\u00e0 l\u00e0m cho danh t\u00ednh c\u1ee7a h\u1ecd kh\u00f3 ph\u00e1t hi\u1ec7n h\u01a1n. Trong nh\u1eefng packet tin c\u00f3 th\u1ec3 b\u1ecb gi\u1ea3 m\u1ea1o, c\u00f3 nh\u1eefng packet tin c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n l\u1ea1i ngu\u1ed3n c\u1ee7a h\u1ecd. Vi\u1ec7c n\u00e0y r\u1ea5t kh\u00f3 \u0111\u1ec3 kh\u00e1m ph\u00e1 ra danh t\u00ednh nh\u01b0ng kh\u00f4ng ph\u1ea3i l\u00e0 kh\u00f4ng th\u1ec3. \u0110\u1eb7c bi\u1ec7t l\u00e0 c\u00e1c nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5 Internet (ISP) s\u1eb5n s\u00e0ng gi\u00fap \u0111\u1ee1.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>3.3. T\u1ea5n c\u00f4ng ph\u00e2n t\u00e1n tr\u1ef1c ti\u1ebfp (DDoS)<\/strong><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"> N\u1ebfu cu\u1ed9c t\u1ea5n c\u00f4ng t\u1ea1o ra b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng Botnet th\u00ec kh\u1ea3 n\u0103ng theo d\u00f5i cu\u1ed9c t\u1ea5n c\u00f4ng tr\u1edf l\u1ea1i ngu\u1ed3n c\u1ee7a n\u00f3 r\u1ea5t th\u1ea5p. V\u1edbi m\u1ee9c \u0111\u1ed9 che gi\u1ea5u \u0111\u01b0\u1ee3c th\u00eam v\u00e0o, k\u1ebb t\u1ea5n c\u00f4ng c\u00f3 th\u1ec3 c\u00f3 c\u00e1c thi\u1ebft b\u1ecb ph\u00e2n t\u00e1n c\u0169ng gi\u1ea3 m\u1ea1o \u0111\u1ecba ch\u1ec9 IP m\u00e0 n\u00f3 g\u1eedi c\u00e1c packet. N\u1ebfu ng\u01b0\u1eddi t\u1ea5n c\u00f4ng \u0111ang s\u1eed d\u1ee5ng botnet nh\u01b0 mirai botnet. Nh\u00ecn chung h\u1ecd s\u1ebd th\u00e0nh c\u00f4ng trong vi\u1ec7c che gi\u1ea5u IP v\u1ec1 thi\u1ebft b\u1ecb b\u1ecb nhi\u1ec5m.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng t\u1ea5n c\u00f4ng SYN flood, m\u1ed9t k\u1ebb x\u1ea5u n\u00e0o \u0111\u00f3 c\u1ed1 g\u1eafng t\u1ea1o ra s\u1ef1 t\u1ea5n c\u00f4ng Ddos t\u1edbi thi\u1ebft b\u1ecb m\u1ee5c ti\u00eau. Ho\u1eb7c d\u1ecbch v\u1ee5 v\u1edbi l\u01b0u l\u01b0\u01a1ng truy c\u1eadp \u00edt h\u01a1n so v\u1edbi c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng Ddos. Thay cho c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng l\u1edbn, nh\u1eb1m m\u1ee5c \u0111\u00edch l\u00e0m qu\u00e1 t\u1ea3i c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng xung quanh m\u1ee5c ti\u00eau. SYN attacks only need to be larger than the available backlog in the target\u2019s operating system. N\u1ebfu k\u1ebb t\u1ea5n c\u00f4ng c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh k\u00edch th\u01b0\u1edbc c\u1ee7a backlog v\u00e0 m\u1ed7i l\u1ea7n k\u1ebft n\u1ed1i s\u1ebd m\u1edf trong bao l\u00e2u tr\u01b0\u1edbc khi h\u1ebft th\u1eddi gian. K\u1ebb t\u1ea5n c\u00f4ng c\u00f3 th\u1ec3 nh\u1eafm m\u1ee5c ti\u00eau c\u00e1c tham s\u1ed1 ch\u00ednh x\u00e1c c\u1ea7n thi\u1ebft \u0111\u1ec3 v\u00f4 hi\u1ec7u h\u00f3a h\u1ec7 th\u1ed1ng. C\u00f3 th\u1ec3 b\u1eb1ng c\u00e1ch gi\u1ea3m t\u1ed5ng l\u01b0u l\u01b0\u1ee3ng xu\u1ed1ng m\u1ee9c t\u1ed1i thi\u1ec3u c\u1ea7n thi\u1ebft \u0111\u1ec3 t\u1ea1o Ddos.<\/span><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" class=\"size-full wp-image-7113 aligncenter\" src=\"http:\/\/vnso.vn\/wp-content\/uploads\/2019\/10\/10.jpg\" alt=\"SYN flood attack\" width=\"661\" height=\"438\" \/><\/p>\n<h2 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>4. L\u00e0m th\u1ebf \u0111\u1ec3 kh\u1eafc ph\u1ee5c t\u1ea5n c\u00f4ng SYN flood attack?<\/strong><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">L\u1ed7 h\u1ed5ng SYN flood \u0111\u00e3 \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn t\u1eeb l\u00e2u v\u00e0 m\u1ed9t s\u1ed1 c\u00e1ch gi\u1ea3m thi\u1ec3u \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. M\u1ed9t v\u00e0i c\u00e1ch kh\u1eafc ph\u1ee5c bao g\u1ed3m:<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>4.1. T\u0103ng h\u00e0ng \u0111\u1ee3i backlog<\/strong><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">M\u1ed7i h\u1ec7 \u0111i\u1ec1u h\u00e0nh tr\u00ean thi\u1ebft b\u1ecb m\u1ee5c ti\u00eau c\u00f3 m\u1ed9t s\u1ed1 k\u1ebft n\u1ed1i nh\u1ea5t \u0111\u1ecbnh half-open cho ph\u00e9p. M\u1ed9t ph\u1ea3n h\u1ed3i \u0111\u1ed1i v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn c\u00e1c g\u00f3i SYN l\u00e0 t\u0103ng s\u1ed1 l\u01b0\u1ee3ng k\u1ebft n\u1ed1i half-open t\u1ed1i \u0111a. \u0110\u1ec3 t\u0103ng th\u00e0nh c\u00f4ng h\u1ec7 th\u1ed1ng ph\u1ea3i d\u1ef1 tr\u1eef th\u00eam b\u1ed9 nh\u1edb \u0111\u1ec3 x\u1eed l\u00fd c\u00e1c y\u00eau c\u1ea7u m\u1edbi. Khi h\u1ec7 th\u1ed1ng kh\u00f4ng c\u00f3 \u0111\u1ee7 b\u1ed9 nh\u1edb \u0111\u1ec3 x\u1eed l\u00fd k\u00edch th\u01b0\u1edbc, backlog t\u1ed3n \u0111\u1ecdng t\u0103ng l\u00ean hi\u1ec7u su\u1ea5t h\u1ec7 th\u1ed1ng b\u1ecb \u1ea3nh h\u01b0\u1edfng ti\u00eau c\u1ef1c. Nh\u01b0ng \u0111i\u1ec1u \u0111\u00f3 v\u1eabn t\u1ed1t h\u01a1n b\u1ecb t\u1ea5n c\u00f4ng Ddos.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>4.2. L\u1eb7p l\u1ea1i s\u1ef1 k\u1ebft n\u1ed1i half-open TCP c\u0169<\/strong><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">L\u1eb7p l\u1ea1i k\u1ebft n\u1ed1i half-open TCP c\u0169 sau khi backlog \u0111\u00e3 \u0111\u01b0\u1ee3c l\u1ea5p \u0111\u1ea7y. C\u00e1ch n\u00e0y y\u00eau c\u1ea7u c\u00e1c k\u1ebft n\u1ed1i h\u1ee3p ph\u00e1p \u0111\u1ea7y \u0111\u1ee7 trong th\u1eddi gian ng\u1eafn. Thay v\u00ec so v\u1edbi c\u00e1c backlog b\u1eb1ng c\u00e1c packets SYN \u0111\u1ed9c h\u1ea1i. C\u00e1ch b\u1ea3o v\u1ec7 n\u00e0y th\u1ea5t b\u1ea1i khi s\u1ed1 l\u01b0\u1ee3ng t\u1ea5n c\u00f4ng t\u0103ng l\u00ean, k\u00edch th\u01b0\u1edbc backlog qu\u00e1 nh\u1ecf th\u00ec kh\u00f4ng th\u00edch h\u1ee3p.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>4.3. SYN cookies<\/strong><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">C\u00e1ch n\u00e0y li\u00ean quan \u0111\u1ebfn vi\u1ec7c t\u1ea1o ra 1 cookie c\u1ee7a server. \u0110\u1ec3 tr\u00e1nh nguy c\u01a1 m\u1ea5t c\u00e1c k\u1ebft n\u1ed1i khi backlog \u0111\u00e3 \u0111\u01b0\u1ee3c l\u1ea5p \u0111\u1ea7y. <a style=\"color: #000000;\" href=\"https:\/\/thuemaychudell.com\/\">Server<\/a> ph\u1ea3n h\u1ed3i t\u1eebng y\u00eau c\u1ea7u k\u1ebft n\u1ed1i t\u1eeb packet SNY\/ACK, sau \u0111\u00f3 lo\u1ea1i b\u1ecf ph\u1ea3n h\u1ed3i SYN kh\u1ecfi backlog. X\u00f3a y\u00eau c\u1ea7u kh\u1ecfi b\u1ed9 nh\u1edb v\u00e0 \u0111\u1ec3 port m\u1edf v\u00e0 s\u1eb5n s\u00e0ng t\u1ea1o k\u1ebft n\u1ed1i m\u1edbi. N\u1ebfu k\u1ebft n\u1ed1i l\u00e0 m\u00f4t y\u00eau c\u1ea7u h\u1ee3p ph\u00e1p v\u00e0 packet ACK cu\u1ed1i c\u00f9ng \u0111\u01b0\u1ee3c g\u1eedi t\u1eeb client \u0111\u1ebfn server. Sau \u0111\u00f3 server s\u1ebd x\u00e2y d\u1ef1ng l\u1ea1i (v\u1edbi 1 s\u1ed1 h\u1ea1n ch\u1ebf) ti\u1ebfp nh\u1eadn SYN backlog. M\u1eb7c d\u00f9 s\u1ef1 c\u1ed1 g\u1eafng gi\u1ea3m thi\u1ec3u n\u00e0y m\u1ea5t m\u1ed9t s\u1ed1 th\u00f4ng tin v\u1ec1 k\u1ebft n\u1ed1i TCP. Nh\u01b0ng n\u00f3 l\u00e0 t\u1ed1t h\u01a1n so v\u1edbi b\u1ecb Ddos t\u1ea5n c\u00f4ng.<\/span><\/p>\n<p style=\"text-align: justify;\"><a href=\"https:\/\/vnso.vn\/en\/thue-may-chu-rieng\/\">&gt;&gt;&gt; Xem th\u00eam c\u00e1c g\u00f3i Thu\u00ea M\u00e1y Ch\u1ee7 t\u1ea1i VNSO<\/a><\/p>\n<div id=\"attachment_21647\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/vnso.vn\/en\/anti-ddos-website-app-cnnw\/\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-21647\" class=\"wp-image-21647 size-medium\" src=\"https:\/\/vnso.vn\/wp-content\/uploads\/2019\/10\/Dich-vu-Anti-DDoS-VNSO-WEB-800x416.jpg\" alt=\"D\u1ecbch v\u1ee5 Anti-DDoS VNSO WEB\" width=\"800\" height=\"416\" srcset=\"https:\/\/vnso.vn\/wp-content\/uploads\/2019\/10\/Dich-vu-Anti-DDoS-VNSO-WEB-800x416.jpg 800w, https:\/\/vnso.vn\/wp-content\/uploads\/2019\/10\/Dich-vu-Anti-DDoS-VNSO-WEB-1024x532.jpg 1024w, https:\/\/vnso.vn\/wp-content\/uploads\/2019\/10\/Dich-vu-Anti-DDoS-VNSO-WEB-768x399.jpg 768w, https:\/\/vnso.vn\/wp-content\/uploads\/2019\/10\/Dich-vu-Anti-DDoS-VNSO-WEB-18x9.jpg 18w, https:\/\/vnso.vn\/wp-content\/uploads\/2019\/10\/Dich-vu-Anti-DDoS-VNSO-WEB.jpg 1200w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><p id=\"caption-attachment-21647\" class=\"wp-caption-text\">D\u1ecbch v\u1ee5 Anti-DDoS VNSO WEB<\/p><\/div>\n<p>Hi\u1ec7n nay c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng Syn Flood Attack DDoS ng\u00e0y c\u00e0ng tinh vi v\u00e0 kh\u00f3 ph\u00f2ng ch\u1ed1ng h\u01a1n. Ch\u00fang g\u00e2y ra nh\u1eefng thi\u1ec7t h\u1ea1i nghi\u00eam tr\u1ecdng nh\u01b0 t\u1eafc ngh\u1ebdn k\u1ebft n\u1ed1i internet, trung t\u00e2m d\u1eef li\u1ec7u ho\u1eb7c t\u1ea5n c\u00f4ng m\u00e3 \u0111\u1ed9c t\u1ed1ng ti\u1ec1n x\u00e2m nh\u1eadp v\u00e0o h\u1ec7 th\u1ed1ng c\u1ee7a doanh nghi\u1ec7p, t\u1ed5 ch\u1ee9c. Vi\u1ec7c t\u1ea5n c\u00f4ng \u0111ang c\u00f3 xu h\u01b0\u1edbng ng\u00e0y c\u00e0ng gia t\u0103ng.<\/p>\n<p>Do v\u1eady \u0111\u1ec3 gi\u1ea3i quy\u1ebft t\u00ednh \u0111a d\u1ea1ng c\u1ee7a c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng DDoS hi\u1ec7n nay, c\u00e1c doanh nghi\u1ec7p hay t\u1ed5 ch\u1ee9c c\u1ea7n m\u1ed9t <a href=\"https:\/\/vnso.vn\/en\/anti-ddos-website-app-cnnw\/\">gi\u1ea3i ph\u00e1p ph\u00f2ng ch\u1ed1ng to\u00e0n di\u1ec7n<\/a> \u2013 v\u1edbi c\u00e1c gi\u1ea3i ph\u00e1p \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n ngay t\u1ea1i n\u1ed9i t\u1ea1i m\u1ea1ng v\u00e0 k\u1ebft h\u1ee3p v\u1edbi c\u00e1c d\u1ecbch v\u1ee5 c\u1ee7a nh\u00e0 m\u1ea1ng ho\u1eb7c \u0111\u00e1m m\u00e2y.<\/p>\n<p>Hi\u1ec3u r\u00f5 c\u00e1c nhu c\u1ea7u \u0111\u00f3 c\u1ee7a Doanh nghi\u1ec7p, VNSO \u0111\u00e3 v\u00e0 \u0111ang cung c\u1ea5p cho Doanh nghi\u1ec7p m\u1ed9t gi\u1ea3i ph\u00e1p m\u1edbi, ho\u00e0n to\u00e0n kh\u00e1c v\u1edbi c\u00e1c ti\u1ebfp c\u1eadn ban \u0111\u1ea7u v\u00e0 truy\u1ec1n th\u1ed1ng tr\u01b0\u1edbc \u0111\u00e2y. VNSO mang \u0111\u1ebfn s\u1ef1 kh\u00e1c bi\u1ec7t b\u1eb1ng ch\u00ednh c\u00f4ng ngh\u1ec7 s\u1edf h\u1eefu ri\u00eang, \u0111\u00f3 ch\u00ednh l\u00e0 c\u00f4ng ngh\u1ec7 ti\u1ebfp c\u1eadn t\u1ea5n c\u00f4ng DDoS theo m\u1ee9c Stateless. <a href=\"https:\/\/vnso.vn\/en\/anti-ddos-website-app-cnnw\/\">Gi\u1ea3i ph\u00e1p ch\u1ed1ng DDoS Website, APP<\/a> v\u00e0 <a href=\"https:\/\/vnso.vn\/en\/foodshield-cho-game\/\">gi\u1ea3i ph\u00e1p ch\u1ed1ng DDoS Game VNSO<\/a> \u0111\u00e3 gi\u00fap nhi\u1ec1u kh\u00e1ch h\u00e0ng kh\u1ecfi c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng DDoS.<\/p>\n<h2>V\u1ec1 C\u00f4ng Ngh\u1ec7 VNSO<\/h2>\n<p>\u0110\u1ec3 t\u00ecm hi\u1ec3u th\u00f4ng tin v\u1ec1 m\u00e1y ch\u1ee7 v\u00e0 c\u00e1c d\u1ecbch v\u1ee5 Private Cloud, m\u00e1y ch\u1ee7 \u1ea3o, CDN, m\u00e1y ch\u1ee7 v\u1eadt l\u00fd\u2026 Qu\u00fd kh\u00e1ch vui l\u00f2ng li\u00ean h\u1ec7 ch\u00fang t\u00f4i theo th\u00f4ng tin d\u01b0\u1edbi \u0111\u00e2y:<\/p>\n<p><strong>VNSO TECHNOLOGY CO., LTD \u2013 SINCE 2015<\/strong><\/p>\n<ul>\n<li>Website:\u00a0<a href=\"https:\/\/vnso.vn\/en\/\">https:\/\/vnso.vn\/<\/a><\/li>\n<li>Hotline: 0927 444 222 | Email: info@vnso.vn<\/li>\n<li>Tr\u1ee5 s\u1edf: L\u00f4 O s\u1ed1 10, \u0110\u01b0\u1eddng s\u1ed1 15, KDC R\u1ea1ch Mi\u1ec5u, Ph\u01b0\u1eddng 3, Qu\u1eadn B\u00ecnh Th\u1ea1nh, TP. H\u1ed3 Ch\u00ed Minh<\/li>\n<li>VPGD \u0110\u00e0 N\u1eb5ng: 462 \u0110i\u1ec7n Bi\u00ean Ph\u1ee7, Q.Thanh Kh\u00ea, \u0110\u00e0 N\u1eb5ng<\/li>\n<li>VPGD H\u00e0 N\u1ed9i: S\u1ed1 7, Y\u00ean Th\u1ebf, P. V\u0103n Mi\u1ebfu, Q. \u0110\u1ed1ng \u0110a, H\u00e0 N\u1ed9i<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>SYN Flood attack DDoS khai th\u00e1c t\u1eeb l\u1ed7 h\u1ed5ng b\u00ean trong TCP\/ IP. B\u1eaft tay nhau trong vi\u1ec7c t\u1ea5n c\u00f4ng ph\u00e1 v\u1ee1 m\u1ed9t d\u1ecbch v\u1ee5 web. 1. Cu\u1ed9c t\u1ea5n c\u00f4ng SYN Flood l\u00e0 g\u00ec? SYN flood (half-open attack) l\u00e0 m\u1ed9t ki\u1ec3u t\u1ea5n c\u00f4ng t\u1eeb ch\u1ed1i d\u1ecbch v\u1ee5 (DDos). T\u1ea5n c\u00f4ng n\u00e0y v\u1edbi m\u1ee5c \u0111\u00edch l\u00e0m [&hellip;]<\/p>","protected":false},"author":1,"featured_media":21646,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[156],"tags":[73,94,163,122,60],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.3 (Yoast SEO v22.8) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SYN flood attack DDoS l\u00e0 g\u00ec ? 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