{"id":96607,"date":"2024-08-08T17:34:03","date_gmt":"2024-08-08T09:34:03","guid":{"rendered":"https:\/\/www.techphant.cn\/?p=96607"},"modified":"2024-08-08T17:34:07","modified_gmt":"2024-08-08T09:34:07","slug":"tzsm","status":"publish","type":"post","link":"https:\/\/www.techphant.cn\/blog\/96607.html","title":{"rendered":"TTL\u6307\u4ec0\u4e48"},"content":{"rendered":"\n<p>\u3000\u3000\u5728\u7f51\u7edc\u534f\u8bae\u4e2d\uff0c<strong>TTL<\/strong>(Time to Live)\u662f\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u6982\u5ff5\u3002\u5b83\u6307\u7684\u662fIP\u6570\u636e\u5305\u5728\u7f51\u7edc\u4e2d\u53ef\u4ee5\u4f20\u8f93\u7684\u6700\u5927\u8df3\u6570\u6216\u65f6\u95f4\u9650\u5236\u3002\u5177\u4f53\u6765\u8bf4\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u3000\u3000<strong>\u8df3\u6570\u9650\u5236<\/strong>\uff1a\u6bcf\u4e2a\u8def\u7531\u5668\u5728\u5904\u7406\u6570\u636e\u5305\u65f6\u4f1a\u5c06TTL\u503c\u51cf\u4e00\uff0c\u5f53TTL\u503c\u964d\u4e3a\u96f6\u65f6\uff0c\u8be5\u6570\u636e\u5305\u4f1a\u88ab\u4e22\u5f03\u3002\u8fd9\u79cd\u673a\u5236\u9632\u6b62\u4e86\u6570\u636e\u5305\u5728\u7f51\u7edc\u4e2d\u65e0\u9650\u5faa\u73af\uff0c\u4ece\u800c\u907f\u514d\u8def\u7531\u73af\u8def\u95ee\u9898\u3002<\/li>\n\n\n\n<li>\u3000\u3000<strong>\u65f6\u95f4\u9650\u5236<\/strong>\uff1a\u867d\u7136TTL\u901a\u5e38\u88ab\u7406\u89e3\u4e3a\u8df3\u6570\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4e5f\u53ef\u4ee5\u770b\u4f5c\u662f\u65f6\u95f4\u9650\u5236\u3002\u4f8b\u5982\uff0c\u5728\u67d0\u4e9b\u7f51\u7edc\u5e94\u7528\u4e2d\uff0cTTL\u53ef\u4ee5\u6307\u5b9a\u6570\u636e\u5305\u5728\u7f51\u7edc\u4e2d\u7684\u6700\u5927\u751f\u5b58\u65f6\u95f4(\u4ee5\u79d2\u4e3a\u5355\u4f4d)\uff0c\u8d85\u8fc7\u8fd9\u4e2a\u65f6\u95f4\u7684\u6570\u636e\u5305\u4e5f\u4f1a\u88ab\u4e22\u5f03\u3002<\/li>\n\n\n\n<li>\u3000\u3000<strong>\u9632\u6b62\u65e0\u9650\u5faa\u73af<\/strong>\uff1aTTL\u7684\u4e3b\u8981\u76ee\u7684\u662f\u786e\u4fdd\u6570\u636e\u5305\u4e0d\u4f1a\u5728\u7f51\u7edc\u4e2d\u65e0\u4f11\u6b62\u5730\u4f20\u9012\u3002\u5f53\u53d1\u751f\u8def\u7531\u9519\u8bef\u6216\u7f51\u7edc\u6545\u969c\u65f6\uff0cTTL\u53ef\u4ee5\u4fdd\u62a4\u7f51\u7edc\u514d\u53d7\u6301\u7eed\u7684\u65e0\u6548\u6570\u636e\u6d41\u5f71\u54cd\u3002<\/li>\n\n\n\n<li>\u3000\u3000<strong>\u7f51\u7edc\u6027\u80fd\u548c\u7a33\u5b9a\u6027<\/strong>\uff1a\u901a\u8fc7\u63a7\u5236\u6570\u636e\u5305\u7684\u8df3\u6570\u548c\u751f\u5b58\u65f6\u95f4\uff0cTTL\u6709\u52a9\u4e8e\u7ef4\u6301\u7f51\u7edc\u7684\u7a33\u5b9a\u6027\u548c\u6027\u80fd\uff0c\u907f\u514d\u56e0\u6570\u636e\u5305\u65e0\u9650\u5faa\u73af\u800c\u5bfc\u81f4\u7684\u8d44\u6e90\u6d6a\u8d39\u548c\u7f51\u7edc\u62e5\u585e\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u3000\u3000TTL\u5728\u8ba1\u7b97\u673a\u7f51\u7edc\u4e2d\u4e3b\u8981\u7528\u4e8e\u63a7\u5236\u6570\u636e\u5305\u5728\u7f51\u7edc\u4e2d\u7684\u4f20\u8f93\u8def\u5f84\u548c\u65f6\u95f4\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u5305\u80fd\u591f\u6709\u6548\u3001\u5b89\u5168\u5730\u5230\u8fbe\u76ee\u7684\u5730\uff0c\u5e76\u4e14\u4e0d\u4f1a\u56e0\u4e3a\u8def\u7531\u9519\u8bef\u800c\u65e0\u9650\u5faa\u73af\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u3000\u3000\u4e00\u3001 TTL\u503c\u5728\u4e0d\u540c\u7f51\u7edc\u534f\u8bae\u4e2d\u7684\u5177\u4f53\u4f5c\u7528\u548c\u5dee\u5f02\u662f\u4ec0\u4e48?<\/h2>\n\n\n\n<p>\u3000\u3000TTL(\u751f\u5b58\u65f6\u95f4\uff0cTime-To-Live)\u5728\u4e0d\u540c\u7f51\u7edc\u534f\u8bae\u4e2d\u5177\u6709\u4e0d\u540c\u7684\u4f5c\u7528\u548c\u5dee\u5f02\u3002\u4ee5\u4e0b\u662f\u57fa\u4e8e\u6211\u641c\u7d22\u5230\u7684\u8d44\u6599\u5bf9TTL\u5728IP\u534f\u8bae\u548cDNS\u534f\u8bae\u4e2d\u7684\u5177\u4f53\u4f5c\u7528\u548c\u5dee\u5f02\u7684\u8be6\u7ec6\u89e3\u91ca\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u3000\u30001. \u5728IP\u534f\u8bae\u4e2d\u7684TTL\u503c<\/h3>\n\n\n\n<p>\u3000\u3000<strong>\u5b9a\u4e49\u4e0e\u4f5c\u7528<\/strong>\uff1a<\/p>\n\n\n\n<p>\u3000\u3000TTL\u662fIP\u6570\u636e\u5305\u4e2d\u7684\u4e00\u4e2a\u5b57\u6bb5\uff0c\u7528\u4e8e\u63a7\u5236\u6570\u636e\u5305\u5728\u7f51\u7edc\u4e2d\u7684\u751f\u5b58\u65f6\u95f4\u3002<\/p>\n\n\n\n<p>\u3000\u3000\u6bcf\u5f53\u6570\u636e\u5305\u7ecf\u8fc7\u4e00\u4e2a\u8def\u7531\u5668\u65f6\uff0c\u8def\u7531\u5668\u4f1a\u5c06TTL\u5b57\u6bb5\u7684\u503c\u51cf1.\u5982\u679cTTL\u7684\u503c\u51cf\u52300.\u8def\u7531\u5668\u4f1a\u4e22\u5f03\u8be5\u6570\u636e\u5305\uff0c\u5e76\u5411\u6e90\u4e3b\u673a\u53d1\u9001\u201cTime Exceeded\u201d(\u8d85\u65f6)\u7684\u9519\u8bef\u6d88\u606f\u3002<\/p>\n\n\n\n<p>\u3000\u3000\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u6570\u636e\u5305\u5728\u7f51\u7edc\u4e2d\u65e0\u4f11\u6b62\u5730\u4f20\u64ad\uff0c\u9632\u6b62\u7f51\u7edc\u8d44\u6e90\u88ab\u65e0\u9650\u5faa\u73af\u5360\u7528\u3002<\/p>\n\n\n\n<p>\u3000\u3000<strong>\u6700\u5927\u503c\u4e0e\u63a8\u8350\u503c<\/strong>\uff1a<\/p>\n\n\n\n<p>\u3000\u3000TTL\u7684\u6700\u5927\u503c\u662f255.\u4f46\u901a\u5e38\u63a8\u8350\u4f7f\u752864\u4f5c\u4e3aTTL\u503c\u4ee5\u786e\u4fdd\u6570\u636e\u5305\u80fd\u591f\u987a\u5229\u5230\u8fbe\u76ee\u7684\u5730\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u3000\u30002. \u5728DNS\u534f\u8bae\u4e2d\u7684TTL\u503c<\/h3>\n\n\n\n<p>\u3000\u3000<strong>\u5b9a\u4e49\u4e0e\u4f5c\u7528<\/strong>\uff1a<\/p>\n\n\n\n<p>\u3000\u3000TTL\u8868\u793a\u57df\u540d\u89e3\u6790\u8bb0\u5f55\u5728DNS\u670d\u52a1\u5668\u4e0a\u7684\u7f13\u5b58\u65f6\u95f4\u3002\u7b80\u5355\u6765\u8bf4\uff0c\u5b83\u51b3\u5b9a\u4e86DNS\u8bb0\u5f55\u5728DNS\u670d\u52a1\u5668\u4e0a\u4fdd\u7559\u7684\u65f6\u95f4\u3002<\/p>\n\n\n\n<p>\u3000\u3000\u5f53\u5404\u5730\u7684DNS\u670d\u52a1\u5668\u63a5\u6536\u5230\u89e3\u6790\u8bf7\u6c42\u65f6\uff0c\u5b83\u4eec\u4f1a\u68c0\u67e5\u672c\u5730\u7f13\u5b58\u4e2d\u7684\u8bb0\u5f55\u662f\u5426\u8fc7\u671f\u3002\u5982\u679c\u8bb0\u5f55\u5df2\u8fc7\u671f\u6216\u4e0d\u5b58\u5728\uff0c\u5219\u4f1a\u5411\u6839\u670d\u52a1\u5668\u67e5\u8be2\u5e76\u66f4\u65b0\u7f13\u5b58\uff0c\u8bbe\u7f6e\u65b0\u7684TTL\u503c\u3002<\/p>\n\n\n\n<p>\u3000\u3000<strong>\u5f71\u54cd\u56e0\u7d20<\/strong>\uff1a<\/p>\n\n\n\n<p>\u3000\u3000TTL\u503c\u7684\u8bbe\u7f6e\u5bf9\u4e8e\u57df\u540d\u89e3\u6790\u7684\u6548\u7387\u548c\u51c6\u786e\u6027\u6709\u91cd\u8981\u5f71\u54cd\u3002\u5408\u7406\u7684TTL\u503c\u53ef\u4ee5\u786e\u4fdd\u7f51\u7ad9\u7684\u5b89\u5168\u7a33\u5b9a\u8fd0\u884c\u3002<\/p>\n\n\n\n<p>\u3000\u3000\u6570\u503c\u8d8a\u5c0f\uff0c\u4fee\u6539\u8bb0\u5f55\u5404\u5730\u751f\u6548\u7684\u65f6\u95f4\u8d8a\u5feb;\u6570\u503c\u8d8a\u5927\uff0c\u7f13\u5b58\u65f6\u95f4\u8d8a\u957f\uff0c\u53ef\u80fd\u5bfc\u81f4\u67d0\u4e9b\u4fe1\u606f\u672a\u80fd\u53ca\u65f6\u66f4\u65b0\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u3000\u30003. \u5dee\u5f02<\/h3>\n\n\n\n<p>\u3000\u3000<strong>\u5e94\u7528\u573a\u666f\u4e0d\u540c<\/strong>\uff1aIP\u534f\u8bae\u4e2d\u7684TTL\u7528\u4e8e\u63a7\u5236\u6570\u636e\u5305\u5728\u7f51\u7edc\u4e2d\u7684\u4f20\u8f93\u65f6\u95f4\u548c\u907f\u514d\u65e0\u9650\u5faa\u73af;\u800cDNS\u534f\u8bae\u4e2d\u7684TTL\u7528\u4e8e\u63a7\u5236\u57df\u540d\u89e3\u6790\u8bb0\u5f55\u5728DNS\u670d\u52a1\u5668\u4e0a\u7684\u7f13\u5b58\u65f6\u95f4\u3002<\/p>\n\n\n\n<p>\u3000\u3000<strong>\u529f\u80fd\u76ee\u7684\u4e0d\u540c<\/strong>\uff1aIP\u534f\u8bae\u4e2d\u7684TTL\u4e3b\u8981\u662f\u4e3a\u4e86\u9632\u6b62\u6570\u636e\u5305\u5728\u7f51\u7edc\u4e2d\u65e0\u9650\u5faa\u73af\uff0c\u8282\u7701\u7f51\u7edc\u8d44\u6e90;DNS\u534f\u8bae\u4e2d\u7684TTL\u5219\u662f\u4e3a\u4e86\u63d0\u9ad8\u57df\u540d\u89e3\u6790\u7684\u6548\u7387\u548c\u51c6\u786e\u6027\uff0c\u786e\u4fdd\u7528\u6237\u80fd\u591f\u53ca\u65f6\u83b7\u53d6\u6700\u65b0\u7684\u57df\u540d\u4fe1\u606f\u3002<\/p>\n\n\n\n<p>\u3000\u3000\u901a\u8fc7\u4ee5\u4e0a\u5206\u6790\u53ef\u4ee5\u770b\u51fa\uff0c\u867d\u7136TTL\u5728\u4e0d\u540c\u7f51\u7edc\u534f\u8bae\u4e2d\u90fd\u626e\u6f14\u7740\u91cd\u8981\u7684\u89d2\u8272\uff0c\u4f46\u5176\u5177\u4f53\u4f5c\u7528\u548c\u5b9e\u73b0\u65b9\u5f0f\u5b58\u5728\u663e\u8457\u5dee\u5f02\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u3000\u3000\u4e8c\u3001 \u5982\u4f55\u914d\u7f6eTTL\u503c\u4ee5\u4f18\u5316\u7f51\u7edc\u6027\u80fd\u548c\u51cf\u5c11\u62e5\u585e?<\/h2>\n\n\n\n<p>\u3000\u3000\u914d\u7f6eTTL\u503c\u4ee5\u4f18\u5316\u7f51\u7edc\u6027\u80fd\u548c\u51cf\u5c11\u62e5\u585e\u9700\u8981\u7efc\u5408\u8003\u8651\u591a\u4e2a\u56e0\u7d20\uff0c\u5305\u62ec\u64cd\u4f5c\u7cfb\u7edf\u3001\u7f51\u7edc\u73af\u5883\u4ee5\u53ca\u5177\u4f53\u7684\u5e94\u7528\u573a\u666f\u3002\u4ee5\u4e0b\u662f\u8be6\u7ec6\u7684\u6b65\u9aa4\u548c\u5efa\u8bae\uff1a<\/p>\n\n\n\n<p>\u3000\u3000\u5728Linux\u7cfb\u7edf\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6enet.ipv4.ip _default_ttl\u53c2\u6570\u6765\u8c03\u6574\u9ed8\u8ba4\u7684TTL\u503c\u3002\u4f8b\u5982\uff0c\u5c06\u8be5\u503c\u8bbe\u7f6e\u4e3a64\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u5305\u5728\u7f51\u7edc\u4e2d\u7684\u4f20\u8f93\u6548\u7387\uff0c\u4f46\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u589e\u5927\u8be5\u503c\u53ef\u80fd\u4f1a\u964d\u4f4e\u7cfb\u7edf\u6027\u80fd\u3002<\/p>\n\n\n\n<p>\u3000\u3000TTL\u662fDNS\u8bb0\u5f55\u5728\u7f13\u5b58\u4e2d\u5b58\u50a8\u7684\u65f6\u95f4\u3002\u8fc7\u957f\u6216\u8fc7\u77ed\u7684TTL\u8bbe\u7f6e\u90fd\u4f1a\u5f71\u54cd\u6027\u80fd\u548c\u5b89\u5168\u6027\u3002\u6839\u636e\u5b9e\u9645\u9700\u6c42\uff0c\u5408\u7406\u8bbe\u7f6eDNS\u8bb0\u5f55\u7684TTL\u503c\uff0c\u4ee5\u5e73\u8861\u7f51\u7edc\u8d1f\u8f7d\u548cDNS\u89e3\u6790\u7684\u901f\u5ea6\u3002<\/p>\n\n\n\n<p>\u3000\u3000TTL\u503c\u6709\u52a9\u4e8e\u9632\u6b62\u6570\u636e\u5305\u5728\u7f51\u7edc\u4e2d\u65e0\u9650\u5faa\u73af\uff0c\u4ece\u800c\u63d0\u9ad8\u7f51\u7edc\u4f20\u8f93\u6548\u7387\u3002\u901a\u8fc7\u5408\u7406\u8bbe\u7f6eTTL\u503c\uff0c\u53ef\u4ee5\u786e\u4fdd\u6570\u636e\u5305\u80fd\u591f\u5728\u5408\u7406\u7684\u65f6\u95f4\u5185\u5230\u8fbe\u76ee\u6807\u4e3b\u673a\uff0c\u540c\u65f6\u4e5f\u53ef\u4ee5\u907f\u514d\u7f51\u7edc\u62e5\u585e\u548c\u8d44\u6e90\u6d6a\u8d39\u3002<\/p>\n\n\n\n<p>\u3000\u3000\u6269\u5927TTL\u503c\u53ef\u4ee5\u6709\u6548\u5730\u63d0\u9ad8\u7f51\u7edc\u8fde\u63a5\u7684\u7a33\u5b9a\u6027\u548c\u53ef\u9760\u6027\uff0c\u907f\u514d\u8fde\u63a5\u4e2d\u65ad\u6216\u65e0\u6cd5\u8bbf\u95ee\u7f51\u7edc\u7684\u95ee\u9898\u3002\u540c\u65f6\uff0c\u6269\u5927TTL\u503c\u8fd8\u53ef\u4ee5\u51cf\u5c11\u6570\u636e\u5305\u5728\u7f51\u7edc\u4e2d\u7684\u4f20\u8f93\u6b21\u6570\uff0c\u964d\u4f4e\u7f51\u7edc\u62e5\u585e\u7684\u98ce\u9669\uff0c\u4ece\u800c\u63d0\u9ad8\u7f51\u7edc\u7684\u4f20\u8f93\u901f\u5ea6\u548c\u6548\u7387\u3002<\/p>\n\n\n\n<p>\u3000\u3000\u5728Linux\u7cfb\u7edf\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528iptables\u547d\u4ee4\u6765\u4fee\u6539\u6570\u636e\u5305\u7684TTL\u503c\u3002\u901a\u8fc7\u8bbe\u7f6e\u9002\u5f53\u7684iptables\u89c4\u5219\uff0c\u53ef\u4ee5\u52a8\u6001\u5730\u8c03\u6574\u6570\u636e\u5305\u7684TTL\u503c\uff0c\u4ee5\u9002\u5e94\u4e0d\u540c\u7684\u7f51\u7edc\u73af\u5883\u548c\u5e94\u7528\u9700\u6c42\u3002<\/p>\n\n\n\n<p>\u3000\u3000\u5728\u65e0\u7ebf\u8def\u7531\u5668\u8bbe\u7f6e\u4e2d\uff0cTTL\u503c\u51b3\u5b9a\u4e86\u6570\u636e\u5305\u5728\u7f51\u7edc\u4e2d\u7684\u751f\u5b58\u65f6\u95f4\u3002\u901a\u8fc7\u5408\u7406\u5730\u8bbe\u7f6eTTL\u503c\uff0c\u53ef\u4ee5\u63d0\u5347\u7f51\u7edc\u901f\u5ea6\u548c\u7a33\u5b9a\u6027\u3002\u4f8b\u5982\uff0c\u5c06TTL\u503c\u8bbe\u7f6e\u4e3a\u8f83\u5c0f\u7684\u503c(\u598264)\u53ef\u4ee5\u907f\u514d\u6570\u636e\u5305\u5728\u7f51\u7edc\u4e2d\u65e0\u9650\u5faa\u73af\uff0c\u4ece\u800c\u51cf\u5c11\u62e5\u585e\u3002<\/p>\n\n\n\n<p>\u3000\u3000\u5728\u4e91\u670d\u52a1\u4e2d\uff0cTTL\u503c\u7684\u8bbe\u7f6e\u53ef\u80fd\u53d7\u5230\u9650\u5236\u3002\u4f8b\u5982\uff0c\u5728\u67d0\u4e9b\u4e91\u89e3\u6790DNS\u7248\u672c\u4e2d\uff0cTTL\u503c\u53ef\u4ee5\u8bbe\u7f6e\u4e3a1\u79d2\u3002\u56e0\u6b64\uff0c\u5728\u4f7f\u7528\u4e91\u670d\u52a1\u65f6\uff0c\u9700\u8981\u53c2\u8003\u5177\u4f53\u7684\u6587\u6863\u548c\u6307\u5357\u6765\u8bbe\u7f6e\u5408\u9002\u7684TTL\u503c\u3002<\/p>\n\n\n\n<p>\u3000\u3000\u914d\u7f6eTTL\u503c\u9700\u8981\u6839\u636e\u5177\u4f53\u7684\u7f51\u7edc\u73af\u5883\u548c\u5e94\u7528\u9700\u6c42\u8fdb\u884c\u8c03\u6574\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u3000\u3000\u4e09\u3001 TTL\u503c\u8bbe\u7f6e\u8fc7\u4f4e\u6216\u8fc7\u9ad8\u5bf9\u7f51\u7edc\u5b89\u5168\u6709\u4f55\u5f71\u54cd?<\/h2>\n\n\n\n<p>\u3000\u3000TTL\u503c(Time To Live)\u5728\u7f51\u7edc\u5b89\u5168\u4e2d\u8d77\u7740\u81f3\u5173\u91cd\u8981\u7684\u4f5c\u7528\uff0c\u5176\u8bbe\u7f6e\u8fc7\u4f4e\u6216\u8fc7\u9ad8\u90fd\u4f1a\u5bf9\u7f51\u7edc\u7684\u5b89\u5168\u6027\u548c\u6027\u80fd\u4ea7\u751f\u663e\u8457\u5f71\u54cd\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u3000\u30001. TTL\u503c\u8fc7\u4f4e\u7684\u5f71\u54cd<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u3000\u3000<strong>\u589e\u52a0DNS\u67e5\u8be2\u9891\u7387<\/strong>\uff1a\u5982\u679c\u5c06TTL\u503c\u8bbe\u7f6e\u5f97\u8fc7\u5c0f\uff0c\u4f8b\u59821\u79d2\uff0c\u6bcf\u6b21\u7528\u6237\u8bbf\u95ee\u7f51\u7ad9\u65f6\uff0c\u9012\u5f52\u670d\u52a1\u5668\u90fd\u9700\u8981\u5411\u6743\u5a01DNS\u670d\u52a1\u5668\u8fdb\u884c\u67e5\u8be2\u3002\u8fd9\u4f1a\u589e\u52a0\u7f51\u7edc\u8d1f\u62c5\uff0c\u5bfc\u81f4\u9891\u7e41\u7684DNS\u67e5\u8be2\uff0c\u4ece\u800c\u53ef\u80fd\u5f15\u53d1\u7f51\u7edc\u62e5\u585e\u548c\u5ef6\u8fdf\u3002<\/li>\n\n\n\n<li>\u3000\u3000<strong>\u63d0\u9ad8\u89e3\u6790\u65f6\u95f4<\/strong>\uff1aTTL\u503c\u8fc7\u5c0f\u4f1a\u5bfc\u81f4\u57df\u540d\u89e3\u6790\u8bb0\u5f55\u66f4\u65b0\u4e0d\u53ca\u65f6\uff0c\u56e0\u4e3a\u6bcf\u6b21\u8bf7\u6c42\u90fd\u9700\u8981\u91cd\u65b0\u67e5\u8be2\u6743\u5a01DNS\u670d\u52a1\u5668\uff0c\u800c\u4e0d\u662f\u4f7f\u7528\u7f13\u5b58\u7684\u6570\u636e\u3002\u8fd9\u4e0d\u4ec5\u589e\u52a0\u4e86\u7528\u6237\u7684\u7b49\u5f85\u65f6\u95f4\uff0c\u8fd8\u53ef\u80fd\u5bfc\u81f4\u670d\u52a1\u5668\u538b\u529b\u589e\u5927\u3002<\/li>\n\n\n\n<li>\u3000\u3000<strong>\u4e0d\u7a33\u5b9a\u6027<\/strong>\uff1a\u4f4eTTL\u503c\u867d\u7136\u53ef\u4ee5\u51cf\u5c11\u77ed\u6682\u7684\u4e0d\u4e00\u81f4\u6027\uff0c\u4f46\u540c\u65f6\u4e5f\u589e\u52a0\u4e86\u7f51\u7edc\u7684\u4e0d\u7a33\u5b9a\u6027\u3002\u5f53\u7f51\u7edc\u6216\u4e3b\u673a\u51fa\u73b0\u95ee\u9898\u65f6\uff0c\u7531\u4e8e\u9891\u7e41\u7684\u66f4\u65b0\u548c\u67e5\u8be2\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u670d\u52a1\u4e2d\u65ad\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u3000\u30002. TTL\u503c\u8fc7\u9ad8\u7684\u5f71\u54cd<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u3000\u3000<strong>\u66f4\u65b0\u4e0d\u53ca\u65f6<\/strong>\uff1aTTL\u503c\u8fc7\u5927\u53ef\u80fd\u5bfc\u81f4\u89e3\u6790\u8bb0\u5f55\u66f4\u65b0\u4e0d\u53ca\u65f6\u3002\u8fd9\u610f\u5473\u7740\u5373\u4f7f\u6743\u5a01DNS\u670d\u52a1\u5668\u4e0a\u7684\u6570\u636e\u5df2\u7ecf\u66f4\u65b0\uff0c\u5ba2\u6237\u7aef\u4ecd\u7136\u4f1a\u4f7f\u7528\u65e7\u7684\u6570\u636e\uff0c\u4ece\u800c\u5bfc\u81f4\u4fe1\u606f\u6ede\u540e\u3002<\/li>\n\n\n\n<li>\u3000\u3000<strong>\u5b89\u5168\u98ce\u9669<\/strong>\uff1a\u9ad8TTL\u503c\u867d\u7136\u53ef\u4ee5\u51cf\u5c11\u56e0\u7f51\u7edc\u6216\u4e3b\u673a\u95ee\u9898\u5bfc\u81f4\u7684\u670d\u52a1\u4e2d\u65ad\uff0c\u4f46\u4e5f\u53ef\u80fd\u88ab\u5229\u7528\u6765\u9690\u85cf\u6076\u610f\u6d3b\u52a8\u3002\u4f8b\u5982\uff0c\u5728BGP(\u8fb9\u754c\u7f51\u5173\u534f\u8bae)\u4e2d\uff0c\u901a\u8fc7\u8bbe\u7f6e\u8f83\u9ad8\u7684TTL\u503c\u53ef\u4ee5\u7ed5\u8fc7\u67d0\u4e9b\u5b89\u5168\u673a\u5236\uff0c\u4ece\u800c\u5141\u8bb8\u5206\u5e03\u5f0f\u62d2\u7edd\u670d\u52a1\u653b\u51fb(DDoS)\u7b49\u653b\u51fb\u901a\u8fc7\u3002<\/li>\n\n\n\n<li>\u3000\u3000<strong>\u6027\u80fd\u95ee\u9898<\/strong>\uff1a\u867d\u7136\u9ad8TTL\u503c\u53ef\u4ee5\u51cf\u5c11DNS\u67e5\u8be2\u6b21\u6570\uff0c\u63d0\u9ad8\u89e3\u6790\u6548\u7387\uff0c\u4f46\u5982\u679c\u8bbe\u7f6e\u4e0d\u5f53\uff0c\u4e5f\u53ef\u80fd\u5bfc\u81f4\u6570\u636e\u5305\u5728\u7f51\u7edc\u4e2d\u7684\u4f20\u64ad\u8303\u56f4\u53d7\u9650\uff0c\u5f71\u54cd\u6574\u4f53\u7f51\u7edc\u6027\u80fd\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u3000\u30003. \u7efc\u5408\u5206\u6790<\/h3>\n\n\n\n<p>\u3000\u3000\u5408\u7406\u7684TTL\u503c\u8bbe\u7f6e\u9700\u8981\u6839\u636e\u5177\u4f53\u7684\u5e94\u7528\u573a\u666f\u548c\u9700\u6c42\u8fdb\u884c\u8c03\u6574\u3002\u5bf9\u4e8e\u5927\u591a\u6570\u60c5\u51b5\u800c\u8a00\uff0c\u5efa\u8bae\u5c06TTL\u503c\u8bbe\u7f6e\u5728\u4e00\u4e2a\u5408\u7406\u7684\u8303\u56f4\u5185\uff0c\u4ee5\u5e73\u8861\u5b89\u5168\u6027\u548c\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u5728\u57df\u540d\u89e3\u6790\u4e2d\uff0c\u901a\u5e38\u63a8\u8350\u5c06TTL\u503c\u8bbe\u7f6e\u4e3a300\u79d2\u5de6\u53f3\uff0c\u8fd9\u6837\u65e2\u53ef\u4ee5\u4fdd\u8bc1\u6570\u636e\u7684\u53ca\u65f6\u66f4\u65b0\uff0c\u53c8\u4e0d\u4f1a\u5bf9\u7f51\u7edc\u9020\u6210\u8fc7\u5927\u7684\u538b\u529b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u3000\u3000\u56db\u3001 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