{"id":6904,"date":"2016-09-30T11:39:13","date_gmt":"2016-09-30T03:39:13","guid":{"rendered":"http:\/\/jpuyy.com\/?p=6904"},"modified":"2016-09-30T11:39:13","modified_gmt":"2016-09-30T03:39:13","slug":"%e6%ad%a3%e5%b8%b8%e6%83%85%e5%86%b5%e4%b8%8btcpip%e5%8d%8f%e8%ae%ae%e4%b8%adsyn%e6%8f%a1%e6%89%8b%e5%a4%a7%e8%87%b4%e4%b8%8a%e5%a6%82%e6%ad%a4%ef%bc%9a","status":"publish","type":"post","link":"https:\/\/jpuyy.com\/?p=6904","title":{"rendered":"\u6b63\u5e38\u60c5\u51b5\u4e0bTCP\/IP\u534f\u8bae\u4e2dSYN\u63e1\u624b\u5927\u81f4\u4e0a\u5982\u6b64\uff1a"},"content":{"rendered":"

\u6b63\u5e38\u60c5\u51b5\u4e0bTCP\/IP\u534f\u8bae\u4e2dSYN\u63e1\u624b\u5927\u81f4\u4e0a\u5982\u6b64\uff1a<\/p>\n

    \n
  1. A\uff08\u53d1\u8d77\u8005\uff09\u53d1\u9001\u4e00\u4e2aSYN\u7ed9B\uff08\u63a5\u6536\u8005\uff09<\/li>\n
  2. B\u56de\u590dSYN-ACK\u7ed9A<\/li>\n
  3. A\u56de\u590dACK\u7ed9B<\/li>\n
  4. \u8fde\u63a5\u6210\u529f\uff01<\/li>\n<\/ol>\n

    \u8fd9\u4e2a\u8fc7\u7a0b\u7684\u7f3a\u9677\u662f\uff0c\u5982\u679cA\u662f\u6709\u6076\u610f\u7684\u6765\u6e90\uff0c\u59cb\u7ec8\u4e0d\u505c\u7684\u53d1\u9001SYN\u7ed9B\uff0c\u90a3\u4e48B\u5c31\u4f1a\u4e0d\u505c\u7684\u5efa\u7acb\u8d77\u7a7a\u8fde\u63a5\uff08\u672a\u5b8c\u6210\u7684\u8fde\u63a5\uff09\u7b49\u5f85A\u7684ACK\u54cd\u5e94\uff0c\u53ea\u8981A\u4e0d\u56de\u5e94\uff0cB\u7684\u7a7a\u8fde\u63a5\u5c31\u4f1a\u4e0d\u65ad\u7684\u6d88\u8017\u8d44\u6e90\uff0c\u76f4\u81f3\u65e0\u6cd5\u54cd\u5e94\u3002<\/p>\n

    \u8fd9\u4e2a\u7f3a\u9677\u4e8b\u5b9e\u4e0a\u4e0d\u662f\u64cd\u4f5c\u7cfb\u7edf\u7ea7\u522b\u3001\u9632\u706b\u5899\u7ea7\u522b\u7684\u7f3a\u9677\uff0c\u800c\u662f\u6765\u81ea\u4e8eTCP\/IP\u534f\u8bae\u672c\u8eab\u7684\u8bbe\u8ba1\u7f3a\u9677\u3002<\/p>\n

    \u770b\u4e86\u4e00\u4e0bNetScreen\u7684Screen\u5b89\u5168\u7b56\u7565\u4e2d\u6709\u9488\u5bf9\u5b83\u8bbe\u8ba1\u7684SYN COOKIE\u8bbe\u7f6e\u3002<\/p>\n

    \u4e2a\u4eba\u7406\u89e3\u4e0b\u6765\u8fd9\u662f\u4e00\u4e2a\u5f88\u8ba8\u5de7\u7684\u65b9\u6cd5\uff0c\u4f46\u662f\u7565\u663e\u7b28\u62d9\uff1a<\/p>\n

      \n
    1. NS\u4e4b\u5916\u7684A\u53d1\u9001\u4e86\u4e00\u4e2aSYN\u8bf7\u6c42\u7ed9\u5185\u7f51\u7684B<\/li>\n
    2. NS\u622a\u83b7\u4e86\u8fd9\u4e2a\u8bf7\u6c42\uff0c\u6ca1\u6709\u76f4\u63a5\u5c06\u6570\u636e\u5305\u8f6c\u53d1\u7ed9B\uff0c\u800c\u662f\u81ea\u5df1\u751f\u6210\u4e86\u4e00\u4e2a\u5047\u5192\u7684SYN_ACK\u5305\u56de\u590d\u7ed9A<\/li>\n
    3. A\u56de\u590d\u4e86ACK\uff0c\u6210\u529f\u5b8c\u6210\u63e1\u624b<\/li>\n
    4. NS\u5c06\u4e4b\u524d\u7684SYN\u8bf7\u6c42\u53d1\u9001\u7ed9B<\/li>\n
    5. B\u53d1\u9001SYN-ACK<\/li>\n
    6. NS\u56de\u590dACK<\/li>\n
    7. NS\u642d\u5efaA\u5230B\u7684\u6b63\u5f0f\u901a\u9053<\/li>\n<\/ol>\n

      \u8fd9\u79cd\u65b9\u5f0f\u7c7b\u4f3c\u4e8e\u4e2d\u95f4\u4eba\u7684\u65b9\u5f0f\u5b9e\u73b0\u8fde\u63a5\uff0c\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u662f\u53ef\u4ee5\u4fdd\u62a4B\u4e0d\u53d7\u653b\u51fb\u7684\u4fb5\u6270\u3002\u4f46\u4e8b\u5b9e\u4e0a\u5982\u679c\u8fd9\u65f6\u7684A\u6709\u8db3\u591f\u7684\u8d44\u6e90\uff0c\u5b8c\u5168\u53ef\u4ee5\u8ba9NetScreen\u5efa\u7acb\u7684\u7a7a\u8fde\u63a5\u8fbe\u5230\u65e0\u6cd5\u54cd\u5e94\u7684\u7a0b\u5ea6\uff0c\u8fd9\u6837\u5b9e\u73b0\u7684\u6548\u679c\u53cd\u800c\u8fdc\u8fdc\u5927\u4e8e\u76f4\u63a5\u5bf9B\u53d1\u8d77\u7684\u653b\u51fb\u3002<\/p>\n

      \u5bf9\u4e8e\u7c7b\u4f3c\u7684\u65b9\u6cd5\uff0cNetscreen\u6ca1\u6709\u54cd\u5e94\u7684\u8bbe\u7f6e\uff0c\u76f8\u5e94\u7684\u6587\u6863\u4e0a\u4e5f\u6ca1\u6709\u7ed9\u51fa\u89e3\u91ca\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0cNS\u5e94\u8be5\u662f\u6709\u4e00\u79cd\u5224\u65ad\u673a\u5236\uff0c\u6bd4\u5982\u8bf4\u65f6\u95f4\u6216\u8005\u9891\u7387\u3002\u6b63\u5e38\u60c5\u51b5\u4e0b\u662f\u5141\u8bb8ACK\u56de\u590d\u5ef6\u65f6\u7684\uff0c\u4f46\u5ef6\u65f6\u5230\u4e86\u4e00\u5b9a\u7a0b\u5ea6\uff0c\u6216\u8005\u8fd9\u4e2a\u6765\u6e90\u4e0d\u505c\u7684\u5efa\u7acb\u8fd9\u79cd\u901a\u4fe1\u8fbe\u5230\u4e00\u4e2a\u9600\u503c\uff0cNS\u5c06\u4f1a\u542f\u52a8\u5904\u7406\u673a\u5236\u5c06A\u62c9\u9ed1\uff0c\u540c\u65f6\u5173\u95ed\u6240\u6709\u4e0eA\u6709\u5173\u7684\u8fde\u63a5\u3002<\/p>\n

      \u603b\u7684\u6765\u8bf4\uff0cSYN-ACK-ACK\u653b\u51fb\u5c5e\u4e8e\u4e0d\u5bf9\u7b49\u653b\u51fb\uff0c\u4e0eDDOS\uff0c\u6cea\u6ef4\u7b49\u653b\u51fb\u4e00\u6837\uff0c\u53d1\u8d77\u653b\u51fb\u7684\u6210\u672c\u8981\u8fdc\u8fdc\u4f4e\u4e8e\u9884\u9632\u653b\u51fb\u7684\u6210\u672c\uff0c\u8fd9\u662fTCP\/IP\u7684\u7f3a\u9677\uff0c\u53ea\u8981\u4e0d\u653e\u5f03TCP\/IP\uff0c\u8fd9\u6837\u7684\u653b\u51fb\u5c31\u4f1a\u4e00\u76f4\u5b58\u5728\u3002\u800c\u4e14\u9632\u6b62\u524d\u63d0\u5fc5\u987b\u662f\u201c\u5df2\u7ecf\u53d7\u5230\u4e86\u653b\u51fb\u201d\u4e4b\u540e\uff0c\u5373\u53ea\u80fd\u533b\u6cbb\uff0c\u65e0\u6cd5\u9884\u9632\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

      \u6b63\u5e38\u60c5\u51b5\u4e0bTCP\/IP\u534f\u8bae\u4e2dSYN\u63e1\u624b\u5927\u81f4\u4e0a\u5982\u6b64\uff1a A\uff08\u53d1\u8d77\u8005\uff09\u53d1\u9001\u4e00\u4e2aSYN\u7ed9B\uff08\u63a5\u6536\u8005\uff09 B\u56de\u590dSYN-ACK\u7ed9A A\u56de\u590dACK\u7ed9B \u8fde\u63a5\u6210\u529f\uff01 \u8fd9\u4e2a\u8fc7\u7a0b\u7684\u7f3a\u9677\u662f\uff0c\u5982\u679cA\u662f\u6709\u6076\u610f\u7684\u6765\u6e90\uff0c\u59cb\u7ec8\u4e0d\u505c\u7684\u53d1\u9001SYN\u7ed9B\uff0c\u90a3\u4e48B\u5c31\u4f1a\u4e0d\u505c\u7684\u5efa\u7acb\u8d77\u7a7a\u8fde\u63a5\uff08\u672a\u5b8c\u6210\u7684\u8fde\u63a5\uff09\u7b49\u5f85A\u7684ACK\u54cd\u5e94\uff0c\u53ea\u8981A\u4e0d\u56de\u5e94\uff0cB\u7684\u7a7a\u8fde\u63a5\u5c31\u4f1a\u4e0d\u65ad\u7684\u6d88\u8017\u8d44\u6e90\uff0c\u76f4\u81f3\u65e0\u6cd5\u54cd\u5e94\u3002 \u8fd9\u4e2a\u7f3a\u9677\u4e8b\u5b9e\u4e0a\u4e0d\u662f\u64cd\u4f5c\u7cfb\u7edf\u7ea7\u522b\u3001\u9632\u706b\u5899\u7ea7\u522b\u7684\u7f3a\u9677\uff0c\u800c\u662f\u6765\u81ea\u4e8eTCP\/IP\u534f\u8bae\u672c\u8eab\u7684\u8bbe\u8ba1\u7f3a\u9677\u3002 \u770b\u4e86\u4e00\u4e0bNetScreen\u7684Screen\u5b89\u5168\u7b56\u7565\u4e2d\u6709\u9488\u5bf9\u5b83\u8bbe\u8ba1\u7684SYN COOKIE\u8bbe\u7f6e\u3002 \u4e2a\u4eba\u7406\u89e3\u4e0b\u6765\u8fd9\u662f\u4e00\u4e2a\u5f88\u8ba8\u5de7\u7684\u65b9\u6cd5\uff0c\u4f46\u662f\u7565\u663e\u7b28\u62d9\uff1a NS\u4e4b\u5916\u7684A\u53d1\u9001\u4e86\u4e00\u4e2aSYN\u8bf7\u6c42\u7ed9\u5185\u7f51\u7684B NS\u622a\u83b7\u4e86\u8fd9\u4e2a\u8bf7\u6c42\uff0c\u6ca1\u6709\u76f4\u63a5\u5c06\u6570\u636e\u5305\u8f6c\u53d1\u7ed9B\uff0c\u800c\u662f\u81ea\u5df1\u751f\u6210\u4e86\u4e00\u4e2a\u5047\u5192\u7684SYN_ACK\u5305\u56de\u590d\u7ed9A A\u56de\u590d\u4e86ACK\uff0c\u6210\u529f\u5b8c\u6210\u63e1\u624b NS\u5c06\u4e4b\u524d\u7684SYN\u8bf7\u6c42\u53d1\u9001\u7ed9B B\u53d1\u9001SYN-ACK NS\u56de\u590dACK NS\u642d\u5efaA\u5230B\u7684\u6b63\u5f0f\u901a\u9053 \u8fd9\u79cd\u65b9\u5f0f\u7c7b\u4f3c\u4e8e\u4e2d\u95f4\u4eba\u7684\u65b9\u5f0f\u5b9e\u73b0\u8fde\u63a5\uff0c\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u662f\u53ef\u4ee5\u4fdd\u62a4B\u4e0d\u53d7\u653b\u51fb\u7684\u4fb5\u6270\u3002\u4f46\u4e8b\u5b9e\u4e0a\u5982\u679c\u8fd9\u65f6\u7684A\u6709\u8db3\u591f\u7684\u8d44\u6e90\uff0c\u5b8c\u5168\u53ef\u4ee5\u8ba9NetScreen\u5efa\u7acb\u7684\u7a7a\u8fde\u63a5\u8fbe\u5230\u65e0\u6cd5\u54cd\u5e94\u7684\u7a0b\u5ea6\uff0c\u8fd9\u6837\u5b9e\u73b0\u7684\u6548\u679c\u53cd\u800c\u8fdc\u8fdc\u5927\u4e8e\u76f4\u63a5\u5bf9B\u53d1\u8d77\u7684\u653b\u51fb\u3002 \u5bf9\u4e8e\u7c7b\u4f3c\u7684\u65b9\u6cd5\uff0cNetscreen\u6ca1\u6709\u54cd\u5e94\u7684\u8bbe\u7f6e\uff0c\u76f8\u5e94\u7684\u6587\u6863\u4e0a\u4e5f\u6ca1\u6709\u7ed9\u51fa\u89e3\u91ca\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0cNS\u5e94\u8be5\u662f\u6709\u4e00\u79cd\u5224\u65ad\u673a\u5236\uff0c\u6bd4\u5982\u8bf4\u65f6\u95f4\u6216\u8005\u9891\u7387\u3002\u6b63\u5e38\u60c5\u51b5\u4e0b\u662f\u5141\u8bb8ACK\u56de\u590d\u5ef6\u65f6\u7684\uff0c\u4f46\u5ef6\u65f6\u5230\u4e86\u4e00\u5b9a\u7a0b\u5ea6\uff0c\u6216\u8005\u8fd9\u4e2a\u6765\u6e90\u4e0d\u505c\u7684\u5efa\u7acb\u8fd9\u79cd\u901a\u4fe1\u8fbe\u5230\u4e00\u4e2a\u9600\u503c\uff0cNS\u5c06\u4f1a\u542f\u52a8\u5904\u7406\u673a\u5236\u5c06A\u62c9\u9ed1\uff0c\u540c\u65f6\u5173\u95ed\u6240\u6709\u4e0eA\u6709\u5173\u7684\u8fde\u63a5\u3002 \u603b\u7684\u6765\u8bf4\uff0cSYN-ACK-ACK\u653b\u51fb\u5c5e\u4e8e\u4e0d\u5bf9\u7b49\u653b\u51fb\uff0c\u4e0eDDOS\uff0c\u6cea\u6ef4\u7b49\u653b\u51fb\u4e00\u6837\uff0c\u53d1\u8d77\u653b\u51fb\u7684\u6210\u672c\u8981\u8fdc\u8fdc\u4f4e\u4e8e\u9884\u9632\u653b\u51fb\u7684\u6210\u672c\uff0c\u8fd9\u662fTCP\/IP\u7684\u7f3a\u9677\uff0c\u53ea\u8981\u4e0d\u653e\u5f03TCP\/IP\uff0c\u8fd9\u6837\u7684\u653b\u51fb\u5c31\u4f1a\u4e00\u76f4\u5b58\u5728\u3002\u800c\u4e14\u9632\u6b62\u524d\u63d0\u5fc5\u987b\u662f\u201c\u5df2\u7ecf\u53d7\u5230\u4e86\u653b\u51fb\u201d\u4e4b\u540e\uff0c\u5373\u53ea\u80fd\u533b\u6cbb\uff0c\u65e0\u6cd5\u9884\u9632\u3002<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[159],"tags":[],"class_list":["post-6904","post","type-post","status-publish","format-standard","hentry","category-network"],"_links":{"self":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts\/6904","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6904"}],"version-history":[{"count":1,"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts\/6904\/revisions"}],"predecessor-version":[{"id":6905,"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts\/6904\/revisions\/6905"}],"wp:attachment":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6904"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6904"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6904"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}