{"id":5702,"date":"2020-11-18T18:28:00","date_gmt":"2020-11-18T10:28:00","guid":{"rendered":"https:\/\/www.ldhost.cn\/jc\/?p=5702"},"modified":"2020-11-08T20:54:43","modified_gmt":"2020-11-08T12:54:43","slug":"%e4%bb%80%e4%b9%88%e6%98%af-syn-%e6%b4%aa%e6%b0%b4%e6%94%bb%e5%87%bb%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.ldhost.cn\/jc\/ddcc\/5702.html","title":{"rendered":"\u4ec0\u4e48\u662f SYN \u6d2a\u6c34\u653b\u51fb\uff1f\u5982\u4f55\u9632\u62a4\uff1f"},"content":{"rendered":"\n<p><a href=\"https:\/\/www.ldhost.cn\/jc\/ddcc\/5689.html\" target=\"_blank\" rel=\"noreferrer noopener\">SYN \u6d2a\u6c34<\/a>\uff08\u534a\u5f00\u8fde\u63a5\u653b\u51fb\uff09\u662f\u4e00\u79cd\u62d2\u7edd\u670d\u52a1 (DDoS) \u653b\u51fb\uff0c\u65e8\u5728\u8017\u5c3d\u53ef\u7528\u670d\u52a1\u5668\u8d44\u6e90\uff0c\u81f4\u4f7f\u670d\u52a1\u5668\u65e0\u6cd5\u4f20\u8f93\u5408\u6cd5\u6d41\u91cf\u3002\u901a\u8fc7\u91cd\u590d\u53d1\u9001\u521d\u59cb\u8fde\u63a5\u8bf7\u6c42 (SYN) \u6570\u636e\u5305\uff0c\u653b\u51fb\u8005\u5c06\u53ef\u51fb\u57ae\u76ee\u6807\u670d\u52a1\u5668\u8ba1\u7b97\u673a\u4e0a\u7684\u6240\u6709\u53ef\u7528\u7aef\u53e3\uff0c\u5bfc\u81f4\u76ee\u6807\u8bbe\u5907\u5728\u54cd\u5e94\u5408\u6cd5\u6d41\u91cf\u65f6\u8868\u73b0\u8fdf\u949d\u4e43\u81f3\u5168\u65e0\u54cd\u5e94\u3002<\/p>\n\n\n\n<p>SYN \u6d2a\u6c34\u653b\u51fb\u5982\u4f55\u5de5\u4f5c\uff1f<br>SYN \u6d2a\u6c34\u653b\u51fb\u5229\u7528 TCP \u8fde\u63a5\u7684\u63e1\u624b\u8fc7\u7a0b\u53d1\u52a8\u653b\u51fb\u3002\u6b63\u5e38\u60c5\u51b5\u4e0b\uff0cTCP \u8fde\u63a5\u5c06\u5b8c\u6210\u4e09\u6b21\u63e1\u624b\u4ee5\u5efa\u7acb\u8fde\u63a5\u3002<\/p>\n\n\n\n<p>1\u3001\u9996\u5148\uff0c\u5ba2\u6237\u7aef\u5411\u670d\u52a1\u5668\u53d1\u9001 SYN \u6570\u636e\u5305\u4ee5\u53d1\u8d77\u8fde\u63a5\u3002<br>2\u3001\u63a5\u7740\uff0c\u670d\u52a1\u5668\u901a\u8fc7 SYN\/ACK \u6570\u636e\u5305\u5bf9\u8be5\u521d\u59cb\u6570\u636e\u5305\u505a\u51fa\u54cd\u5e94\uff0c\u4ee5\u4fbf\u786e\u8ba4\u901a\u4fe1\u3002<br>3\u3001\u6700\u540e\uff0c\u5ba2\u6237\u7aef\u8fd4\u56de ACK \u6570\u636e\u5305\u4ee5\u786e\u8ba4\u63a5\u5230\u670d\u52a1\u5668\u53d1\u51fa\u7684\u6570\u636e\u5305\u3002\u5b8c\u6210\u8fd9\u4e00\u7cfb\u5217\u6570\u636e\u5305\u53d1\u9001\u548c\u63a5\u6536\u64cd\u4f5c\u540e\uff0cTCP \u8fde\u63a5\u5c06\u5904\u4e8e\u6253\u5f00\u72b6\u6001\u5e76\u4e14\u80fd\u591f\u53d1\u9001\u548c\u63a5\u6536\u6570\u636e\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"683\" height=\"377\" src=\"https:\/\/www.ldhost.cn\/jc\/wp-content\/uploads\/2020\/11\/syn-6.png\" alt=\"\" class=\"wp-image-5706\" srcset=\"https:\/\/www.ldhost.cn\/jc\/wp-content\/uploads\/2020\/11\/syn-6.png 683w, https:\/\/www.ldhost.cn\/jc\/wp-content\/uploads\/2020\/11\/syn-6-300x166.png 300w\" sizes=\"auto, (max-width: 683px) 100vw, 683px\" \/><figcaption>TCP \u4e09\u5411\u63e1\u624b\u56fe<\/figcaption><\/figure>\n\n\n\n<p>\u4e3a\u53d1\u8d77\u62d2\u7edd\u670d\u52a1\u653b\u51fb\uff0c\u653b\u51fb\u8005\u9700\u5229\u7528\u8fd9\u6837\u4e00\u9879\u4e8b\u5b9e\uff1a\u6536\u5230\u521d\u59cb SYN \u6570\u636e\u5305\u540e\uff0c\u670d\u52a1\u5668\u5c06\u901a\u8fc7\u4e00\u4e2a\u6216\u591a\u4e2a SYN\/ACK \u6570\u636e\u5305\u505a\u51fa\u56de\u54cd\uff0c\u7b49\u5f85\u5b8c\u6210\u63e1\u624b\u8fc7\u7a0b\u7684\u6700\u540e\u4e00\u6b65\u3002\u5de5\u4f5c\u65b9\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p>1\u3001\u653b\u51fb\u8005\u901a\u5e38\u4f7f\u7528\u4f2a\u9020\u7684 IP \u5730\u5740\u5411\u76ee\u6807\u670d\u52a1\u5668\u53d1\u9001\u5927\u91cf SYN \u6570\u636e\u5305\u3002<br>2\u3001\u7136\u540e\uff0c<a href=\"https:\/\/www.ldhost.cn\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u670d\u52a1\u5668<\/a>\u5206\u522b\u5bf9\u6bcf\u4e00\u9879\u8fde\u63a5\u8bf7\u6c42\u505a\u51fa\u54cd\u5e94\uff0c\u5e76\u786e\u4fdd\u6253\u5f00\u7684\u7aef\u53e3\u505a\u597d\u63a5\u6536\u54cd\u5e94\u7684\u51c6\u5907\u3002<br>3\u3001\u5728\u670d\u52a1\u5668\u7b49\u5f85\u6700\u540e\u4e00\u4e2a ACK \u6570\u636e\u5305\uff08\u6c38\u8fdc\u4e0d\u4f1a\u5230\u8fbe\uff09\u7684\u8fc7\u7a0b\u4e2d\uff0c\u653b\u51fb\u8005\u5c06\u7ee7\u7eed\u53d1\u9001\u66f4\u591a SYN \u6570\u636e\u5305\u3002\u6bcf\u5f53\u6709\u65b0\u7684 SYN \u6570\u636e\u5305\u5230\u8fbe\uff0c\u670d\u52a1\u5668\u90fd\u4f1a\u4e34\u65f6\u6253\u5f00\u4e00\u4e2a\u65b0\u7684\u7aef\u53e3\u5e76\u5728\u4e00\u6bb5\u7279\u5b9a\u65f6\u95f4\u5185\u4fdd\u6301\u8fde\u63a5\uff1b\u7528\u904d\u6240\u6709\u53ef\u7528\u7aef\u53e3\u540e\uff0c\u670d\u52a1\u5668\u5c06\u65e0\u6cd5\u6b63\u5e38\u8fd0\u884c\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"767\" height=\"510\" src=\"https:\/\/www.ldhost.cn\/jc\/wp-content\/uploads\/2020\/11\/syn-7.png\" alt=\"\" class=\"wp-image-5707\" srcset=\"https:\/\/www.ldhost.cn\/jc\/wp-content\/uploads\/2020\/11\/syn-7.png 767w, https:\/\/www.ldhost.cn\/jc\/wp-content\/uploads\/2020\/11\/syn-7-300x199.png 300w\" sizes=\"auto, (max-width: 767px) 100vw, 767px\" \/><figcaption>SYN Flood DDoS \u653b\u51fb<\/figcaption><\/figure>\n\n\n\n<p>\u5728\u7f51\u7edc\u4e2d\uff0c\u5982\u679c\u670d\u52a1\u5668\u8fde\u63a5\u5904\u4e8e\u6253\u5f00\u72b6\u6001\u4f46\u53e6\u4e00\u7aef\u7684\u673a\u5668\u8fde\u63a5\u672a\u6253\u5f00\uff0c\u5219\u89c6\u4e3a\u534a\u5f00\u8fde\u63a5\u3002\u5728\u6b64\u7c7b DDoS \u653b\u51fb\u4e2d\uff0c\u76ee\u6807\u670d\u52a1\u5668\u5c06\u4f7f\u8fde\u63a5\u4e00\u76f4\u5904\u4e8e\u6253\u5f00\u72b6\u6001\uff0c\u9759\u5f85\u5404\u4e2a\u8fde\u63a5\u8d85\u65f6\uff0c\u907f\u514d\u518d\u6b21\u5f00\u653e\u7aef\u53e3\u3002\u56e0\u6b64\uff0c\u6b64\u7c7b\u653b\u51fb\u53ef\u89c6\u4e3a\u201c\u534a\u5f00\u8fde\u63a5\u653b\u51fb\u201d\u3002<\/p>\n\n\n\n<p>\u6076\u610f\u7528\u6237\u53ef\u901a\u8fc7\u4e09\u79cd\u4e0d\u540c\u65b9\u5f0f\u53d1\u8d77 SYN \u6d2a\u6c34\u653b\u51fb\uff1a<br>1\u3001\u76f4\u63a5\u653b\u51fb\uff1a\u4e0d\u4f2a\u9020 IP \u5730\u5740\u7684 SYN \u6d2a\u6c34\u653b\u51fb\u79f0\u4e3a\u76f4\u63a5\u653b\u51fb\u3002\u5728\u6b64\u7c7b\u653b\u51fb\u4e2d\uff0c\u653b\u51fb\u8005\u5b8c\u5168\u4e0d\u5c4f\u853d\u5176 IP \u5730\u5740\u3002\u7531\u4e8e\u653b\u51fb\u8005\u4f7f\u7528\u5177\u6709\u771f\u5b9e IP \u5730\u5740\u7684\u5355\u4e00\u6e90\u8bbe\u5907\u53d1\u8d77\u653b\u51fb\uff0c\u56e0\u6b64\u5f88\u5bb9\u6613\u53d1\u73b0\u5e76\u6e05\u7406\u653b\u51fb\u8005\u3002\u4e3a\u4f7f\u76ee\u6807\u673a\u5668\u5448\u73b0\u534a\u5f00\u72b6\u6001\uff0c\u9ed1\u5ba2\u5c06\u963b\u6b62\u4e2a\u4eba\u673a\u5668\u5bf9\u670d\u52a1\u5668\u7684 SYN-ACK \u6570\u636e\u5305\u505a\u51fa\u54cd\u5e94\u3002\u4e3a\u6b64\uff0c\u901a\u5e38\u91c7\u7528\u4ee5\u4e0b\u4e24\u79cd\u65b9\u5f0f\u5b9e\u73b0\uff1a\u90e8\u7f72\u9632\u706b\u5899\u89c4\u5219\uff0c\u963b\u6b62\u9664 SYN \u6570\u636e\u5305\u4ee5\u5916\u7684\u5404\u7c7b\u4f20\u51fa\u6570\u636e\u5305\uff1b\u6216\u8005\uff0c\u5bf9\u4f20\u5165\u7684\u6240\u6709 SYN-ACK \u6570\u636e\u5305\u8fdb\u884c\u8fc7\u6ee4\uff0c\u9632\u6b62\u5176\u5230\u8fbe\u6076\u610f\u7528\u6237\u673a\u5668\u3002\u5b9e\u9645\u4e0a\uff0c\u8fd9\u79cd\u65b9\u6cd5\u5f88\u5c11\u4f7f\u7528\uff08\u5373\u4fbf\u4f7f\u7528\u8fc7\u4e5f\u4e0d\u591a\u89c1\uff09\uff0c\u56e0\u4e3a\u6b64\u7c7b\u653b\u51fb\u76f8\u5f53\u5bb9\u6613\u7f13\u89e3 \u2013 \u53ea\u9700\u963b\u6b62\u6bcf\u4e2a\u6076\u610f\u7cfb\u7edf\u7684 IP \u5730\u5740\u3002\u54ea\u6015\u653b\u51fb\u8005\u4f7f\u7528\u50f5\u5c38\u7f51\u7edc\uff08\u5982 Mirai \u50f5\u5c38\u7f51\u7edc\uff09\uff0c\u901a\u5e38\u4e5f\u4e0d\u4f1a\u523b\u610f\u5c4f\u853d\u53d7\u611f\u67d3\u8bbe\u5907\u7684 IP\u3002<br>2\u3001\u6b3a\u9a97\u653b\u51fb\uff1a\u6076\u610f\u7528\u6237\u8fd8\u53ef\u4ee5\u4f2a\u9020\u5176\u53d1\u9001\u7684\u5404\u4e2a SYN \u6570\u636e\u5305\u7684 IP \u5730\u5740\uff0c\u4ee5\u4fbf\u963b\u6b62\u7f13\u89e3\u63aa\u65bd\u5e76\u52a0\u5927\u8eab\u4efd\u66b4\u9732\u96be\u5ea6\u3002\u867d\u7136\u6570\u636e\u5305\u53ef\u80fd\u7ecf\u8fc7\u4f2a\u88c5\uff0c\u4f46\u8fd8\u662f\u53ef\u4ee5\u901a\u8fc7\u8fd9\u4e9b\u6570\u636e\u5305\u8ffd\u6839\u6eaf\u6e90\u3002\u6b64\u7c7b\u68c0\u6d4b\u5de5\u4f5c\u5f88\u96be\u5f00\u5c55\uff0c\u4f46\u5e76\u975e\u4e0d\u53ef\u5b9e\u73b0\uff1b\u7279\u522b\u662f\uff0c\u5982\u679c Internet \u670d\u52a1\u63d0\u4f9b\u5546 (ISP) \u613f\u610f\u63d0\u4f9b\u5e2e\u52a9\uff0c\u5219\u66f4\u5bb9\u6613\u5b9e\u73b0\u3002<br>3\u3001\u5206\u5e03\u5f0f\u653b\u51fb\uff08<a href=\"https:\/\/www.ldhost.cn\/jc\/category\/ddcc\" target=\"_blank\" rel=\"noreferrer noopener\">DDoS<\/a>\uff09\uff1a\u5982\u679c\u4f7f\u7528\u50f5\u5c38\u7f51\u7edc\u53d1\u8d77\u653b\u51fb\uff0c\u5219\u8ffd\u6eaf\u653b\u51fb\u6e90\u5934\u7684\u53ef\u80fd\u6027\u5f88\u4f4e\u3002\u968f\u7740\u6df7\u6dc6\u7ea7\u522b\u7684\u6500\u5347\uff0c\u653b\u51fb\u8005\u53ef\u80fd\u8fd8\u4f1a\u547d\u4ee4\u6bcf\u53f0\u5206\u5e03\u5f0f\u8bbe\u5907\u4f2a\u9020\u5176\u53d1\u9001\u6570\u636e\u5305\u7684 IP \u5730\u5740\u3002\u54ea\u6015\u653b\u51fb\u8005\u4f7f\u7528\u50f5\u5c38\u7f51\u7edc\uff08\u5982 Mirai \u50f5\u5c38\u7f51\u7edc\uff09\uff0c\u901a\u5e38\u4e5f\u4e0d\u4f1a\u523b\u610f\u5c4f\u853d\u53d7\u611f\u67d3\u8bbe\u5907\u7684 IP\u3002<br>\u6076\u610f\u7528\u6237\u53ef\u4ee5\u901a\u8fc7 SYN \u6d2a\u6c34\u653b\u51fb\u5c1d\u8bd5\u5728\u76ee\u6807\u8bbe\u5907\u6216\u670d\u52a1\u4e2d\u521b\u5efa\u62d2\u7edd\u670d\u52a1\uff0c\u5176\u6d41\u91cf\u8fdc\u4f4e\u4e8e\u5176\u4ed6 DDoS \u653b\u51fb\u3002SYN \u653b\u51fb\u4e0d\u5c5e\u4e8e\u5bb9\u91cf\u8017\u5c3d\u653b\u51fb\uff0c\u5176\u76ee\u7684\u5e76\u975e\u4f7f\u76ee\u6807\u5468\u56f4\u7684\u7f51\u7edc\u57fa\u7840\u8bbe\u65bd\u8fbe\u5230\u9971\u548c\uff0c\u53ea\u9700\u4fdd\u8bc1\u5927\u4e8e\u76ee\u6807\u64cd\u4f5c\u7cfb\u7edf\u7684\u53ef\u7528\u79ef\u538b\u5de5\u4f5c\u5373\u53ef\u3002\u5982\u679c\u653b\u51fb\u8005\u80fd\u591f\u786e\u5b9a\u79ef\u538b\u5de5\u4f5c\u89c4\u6a21\u4ee5\u53ca\u6bcf\u4e2a\u8fde\u63a5\u4fdd\u6301\u6253\u5f00\u72b6\u6001\u7684\u65f6\u95f4\u957f\u5ea6\uff08\u8d85\u51fa\u65f6\u95f4\u5c06\u8fdb\u5165\u8d85\u65f6\u72b6\u6001\uff09\uff0c\u653b\u51fb\u8005\u5c06\u53ef\u4ee5\u627e\u51fa\u7981\u7528\u7cfb\u7edf\u6240\u9700\u7684\u786e\u5207\u53c2\u6570\uff0c\u4ece\u800c\u5c06\u521b\u5efa\u62d2\u7edd\u670d\u52a1\u6240\u9700\u7684\u603b\u6d41\u91cf\u964d\u81f3\u6700\u4f4e\u3002<\/p>\n\n\n\n<p>\u5982\u4f55\u7f13\u89e3 SYN \u6d2a\u6c34\u653b\u51fb\uff1f<br>SYN 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