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\u62d2\u7edd\u6d41\u91cf<\/h2>\n<p>\u6709\u51e0\u79cd\u4e0d\u540c\u7684\u65b9\u6cd5\u53ef\u4ee5\u963b\u6b62\u6570\u636e\u5305\u5230\u8fbe\u5176\u9884\u671f\u7684\u76ee\u7684\u5730\u3002\u5728\u8fd9\u4e9b\u9009\u62e9\u4e4b\u95f4\u8fdb\u884c\u9009\u62e9\u5bf9\u5ba2\u6237\u7aef\u611f\u77e5\u5176\u8fde\u63a5\u5c1d\u8bd5\u7684\u5f71\u54cd\u5f88\u5927\uff0c\u5e76\u4e14\u80fd\u591f\u5feb\u901f\u786e\u5b9a\u4ed6\u4eec\u7684\u8bf7\u6c42\u5c06\u4e0d\u4f1a\u88ab\u5904\u7406\u7684\u901f\u5ea6\u4e5f\u5f88\u91cd\u8981\u3002<\/p>\n<p>\u6570\u636e\u5305\u53ef\u4ee5\u88ab\u62d2\u7edd\u7684\u7b2c\u4e00\u79cd\u65b9\u5f0f\u662f\u4f7f\u7528DROP\u3002DROP\u53ef\u4ee5\u4f5c\u4e3a\u9ed8\u8ba4\u7b56\u7565\u6216\u5339\u914d\u89c4\u5219\u7684\u76ee\u6807\u3002\u5f53\u6570\u636e\u5305\u88ab\u4e22\u5f03\u65f6\uff0ciptables\u4f1a\u76f4\u63a5\u5c06\u5176\u4e22\u5f03\uff0c\u4e0d\u5411\u5ba2\u6237\u7aef\u53d1\u9001\u4efb\u4f55\u54cd\u5e94\uff0c\u5e76\u4e14\u4e0d\u7ed9\u51fa\u4efb\u4f55\u5173\u4e8e\u63a5\u6536\u5230\u76f8\u5173\u6570\u636e\u5305\u7684\u6307\u793a\u3002\u8fd9\u610f\u5473\u7740\u5ba2\u6237\u7aef\uff08\u65e0\u8bba\u662f\u5408\u6cd5\u8fd8\u662f\u975e\u6cd5\uff09\u5c06\u4e0d\u4f1a\u6536\u5230\u4efb\u4f55\u6570\u636e\u5305\u5df2\u88ab\u63a5\u6536\u7684\u786e\u8ba4\u4fe1\u606f\u3002<\/p>\n<p>\u5bf9\u4e8eTCP\u8fde\u63a5\u5c1d\u8bd5\uff08\u4f8b\u5982\u7531Web\u6d4f\u89c8\u5668\u53d1\u8d77\u7684\u8fde\u63a5\uff09\uff0c\u76f4\u5230\u8fbe\u5230\u8d85\u65f6\u9650\u5236\u4e4b\u524d\uff0c\u8fde\u63a5\u5c06\u88ab\u963b\u585e\u3002\u800c\u5bf9\u4e8eUDP\u5ba2\u6237\u7aef\u800c\u8a00\uff0c\u7f3a\u4e4f\u54cd\u5e94\u66f4\u52a0\u6a21\u7cca\u4e0d\u6e05\u3002\u4e8b\u5b9e\u4e0a\uff0c\u4e0d\u6536\u5230UDP\u5305\u7684\u56de\u590d\u901a\u5e38\u610f\u5473\u7740\u8be5\u5305\u88ab\u63a5\u53d7\u4e86\u3002\u5982\u679cUDP\u5ba2\u6237\u7aef\u5173\u5fc3\u5176\u6570\u636e\u5305\u7684\u63a5\u6536\u60c5\u51b5\uff0c\u5c31\u9700\u8981\u91cd\u65b0\u53d1\u9001\u5b83\u4eec\u4ee5\u5c1d\u8bd5\u786e\u5b9a\u5b83\u4eec\u662f\u88ab\u63a5\u53d7\u3001\u5728\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u4e22\u5931\u8fd8\u662f\u88ab\u4e22\u5f03\u3002\u8fd9\u53ef\u80fd\u4f1a\u589e\u52a0\u6076\u610f\u884c\u4e3a\u8005\u83b7\u53d6\u6709\u5173\u670d\u52a1\u5668\u7aef\u53e3\u72b6\u6001\u7684\u4fe1\u606f\u6240\u9700\u7684\u65f6\u95f4\uff0c\u4f46\u4e5f\u53ef\u80fd\u5bfc\u81f4\u5408\u6cd5\u6d41\u91cf\u51fa\u73b0\u95ee\u9898\u3002<\/p>\n<p>\u4e00\u4e2a\u4e0d\u4e22\u5f03\u6d41\u91cf\u7684\u66ff\u4ee3\u65b9\u6cd5\u662f\u660e\u786e\u5730\u62d2\u7edd\u90a3\u4e9b\u4f60\u4e0d\u5141\u8bb8\u7684\u6570\u636e\u5305\u3002ICMP\uff0c\u5373\u4e92\u8054\u7f51\u63a7\u5236\u6d88\u606f\u534f\u8bae\uff0c\u662f\u4e92\u8054\u7f51\u4e0a\u4f7f\u7528\u7684\u4e00\u79cd\u5143\u534f\u8bae\uff0c\u7528\u4e8e\u5728\u4e3b\u673a\u4e4b\u95f4\u53d1\u9001\u72b6\u6001\u3001\u8bca\u65ad\u548c\u9519\u8bef\u6d88\u606f\uff0c\u4f5c\u4e3a\u4e00\u79cd\u4e0d\u4f9d\u8d56\u4e8e\u4f20\u7edf\u901a\u4fe1\u534f\u8bae\u5982TCP\u6216UDP\u7684\u5e26\u5916\u901a\u9053\u3002\u5f53\u4f60\u4f7f\u7528REJECT\u76ee\u6807\u800c\u4e0d\u662fDROP\u76ee\u6807\u65f6\uff0c\u6d41\u91cf\u88ab\u62d2\u7edd\uff0c\u5e76\u4e14\u5c06\u4e00\u4e2aICMP\u6570\u636e\u5305\u8fd4\u56de\u7ed9\u53d1\u9001\u8005\uff0c\u544a\u77e5\u5176\u4ed6\u4eec\u7684\u6d41\u91cf\u5df2\u88ab\u63a5\u6536\u4f46\u4e0d\u4f1a\u88ab\u63a5\u53d7\u3002\u8fd8\u53ef\u4ee5\u5305\u542b\u4e00\u4e2a\u72b6\u6001\u6d88\u606f\u4ee5\u63d0\u4f9b\u539f\u56e0\u3002<\/p>\n<p>\u8fd9\u4f1a\u5e26\u6765\u4e00\u7cfb\u5217\u7684\u540e\u679c\u3002\u5047\u8bbeICMP\u6d41\u91cf\u88ab\u5141\u8bb8\u5230\u8fbe\u5ba2\u6237\u7aef\uff0c\u4ed6\u4eec\u5c06\u7acb\u5373\u6536\u5230\u901a\u77e5\uff0c\u544a\u77e5\u4ed6\u4eec\u7684\u6d41\u91cf\u88ab\u963b\u6b62\u4e86\u3002\u5bf9\u4e8e\u5408\u6cd5\u7684\u5ba2\u6237\u7aef\u6765\u8bf4\uff0c\u8fd9\u610f\u5473\u7740\u4ed6\u4eec\u53ef\u4ee5\u8054\u7cfb\u7ba1\u7406\u5458\u6216\u68c0\u67e5\u8fde\u63a5\u9009\u9879\uff0c\u786e\u4fdd\u4ed6\u4eec\u6b63\u5728\u8fde\u63a5\u5230\u6b63\u786e\u7684\u7aef\u53e3\u3002\u5bf9\u4e8e\u6076\u610f\u7528\u6237\u6765\u8bf4\uff0c\u8fd9\u610f\u5473\u7740\u4ed6\u4eec\u53ef\u4ee5\u66f4\u77ed\u65f6\u95f4\u5185\u5b8c\u6210\u626b\u63cf\uff0c\u5e76\u7ed8\u5236\u51fa\u5f00\u653e\u3001\u5173\u95ed\u548c\u8fc7\u6ee4\u7684\u7aef\u53e3\u3002<\/p>\n<p>\u5728\u51b3\u5b9a\u662f\u5426\u4e22\u5f03\u6216\u62d2\u7edd\u6d41\u91cf\u65f6\u9700\u8981\u8003\u8651\u8bb8\u591a\u56e0\u7d20\u3002\u4e00\u4e2a\u91cd\u8981\u7684\u8003\u8651\u662f\uff0c\u5927\u591a\u6570\u6076\u610f\u6d41\u91cf\u5b9e\u9645\u4e0a\u662f\u7531\u81ea\u52a8\u5316\u811a\u672c\u6240\u6267\u884c\u3002\u7531\u4e8e\u8fd9\u4e9b\u811a\u672c\u901a\u5e38\u6ca1\u6709\u76d1\u7763\uff0c\u4e22\u5f03\u975e\u6cd5\u6d41\u91cf\u4e0d\u4f1a\u6709\u5b9e\u8d28\u6027\u7684\u5a01\u6151\u4f5c\u7528\uff0c\u540c\u65f6\u4f1a\u7ed9\u5408\u6cd5\u7528\u6237\u5e26\u6765\u8d1f\u9762\u5f71\u54cd\u3002\u5173\u4e8e\u8fd9\u4e2a\u4e3b\u9898\u53ef\u4ee5\u5728\u5f7c\u5f97\u00b7\u8d1d\u5c3c\u7684\u7f51\u7ad9\u4e0a\u627e\u5230\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n<h3>\u4e22\u5f03\u4e0e\u62d2\u7edd\u56de\u5e94\u8868\u683c<\/h3>\n<p>\u4ee5\u4e0b\u8868\u683c\u663e\u793a\u4e86\u4e00\u4e2a\u7531\u9632\u706b\u5899\u4fdd\u62a4\u7684\u670d\u52a1\u5668\u5bf9\u4e0d\u540c\u8bf7\u6c42\u7684\u53cd\u5e94\uff0c\u8fd9\u53d6\u51b3\u4e8e\u5e94\u7528\u4e8e\u76ee\u6807\u7aef\u53e3\u7684\u7b56\u7565\u3002<\/p>\n<div>\n<div class=\"post-table\">\n<table>\n<thead>\n<tr>\n<th>\u5ba2\u6237\u7aef\u6570\u636e\u5305\u7c7b\u578b<\/th>\n<th>NMap \u547d\u4ee4<\/th>\n<th>\u7aef\u53e3\u7b56\u7565<\/th>\n<th>\u54cd\u5e94<\/th>\n<th>\u63a8\u65ad\u7aef\u53e3\u72b6\u6001<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>TCP<\/td>\n<td>nmap [-sT | -sS] -Pn &lt;\u670d\u52a1\u5668&gt;<\/td>\n<td>\u63a5\u53d7<\/td>\n<td>TCP SYN\/ACK<\/td>\n<td>\u5f00\u653e<\/td>\n<\/tr>\n<tr>\n<td>TCP<\/td>\n<td>nmap [-sT | -sS] -Pn &lt;\u670d\u52a1\u5668&gt;<\/td>\n<td>\u4e22\u5f03<\/td>\n<td>(\u65e0)<\/td>\n<td>\u5df2\u8fc7\u6ee4<\/td>\n<\/tr>\n<tr>\n<td>TCP<\/td>\n<td>nmap [-sT | -sS] -Pn &lt;\u670d\u52a1\u5668&gt;<\/td>\n<td>\u62d2\u7edd<\/td>\n<td>TCP RESET<\/td>\n<td>\u5df2\u5173\u95ed<\/td>\n<\/tr>\n<tr>\n<td>UDP<\/td>\n<td>nmap -sU -Pn &lt;\u670d\u52a1\u5668&gt;<\/td>\n<td>\u63a5\u53d7<\/td>\n<td>(\u65e0)<\/td>\n<td>\u5f00\u653e\u6216\u5df2\u8fc7\u6ee4<\/td>\n<\/tr>\n<tr>\n<td>UDP<\/td>\n<td>nmap -sU -Pn &lt;\u670d\u52a1\u5668&gt;<\/td>\n<td>\u4e22\u5f03<\/td>\n<td>(\u65e0)<\/td>\n<td>\u5f00\u653e\u6216\u5df2\u8fc7\u6ee4<\/td>\n<\/tr>\n<tr>\n<td>UDP<\/td>\n<td>nmap -sU -Pn &lt;\u670d\u52a1\u5668&gt;<\/td>\n<td>\u62d2\u7edd<\/td>\n<td>ICMP \u7aef\u53e3\u4e0d\u53ef\u8fbe<\/td>\n<td>\u5df2\u5173\u95ed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p>\u7b2c\u4e00\u5217\u8868\u793a\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u6570\u636e\u5305\u7c7b\u578b\u3002\u7b2c\u4e8c\u5217\u5305\u542b\u53ef\u7528\u4e8e\u6d4b\u8bd5\u6bcf\u79cd\u60c5\u51b5\u7684nmap\u547d\u4ee4\u3002\u7b2c\u4e09\u5217\u8868\u793a\u5e94\u7528\u4e8e\u7aef\u53e3\u7684\u7aef\u53e3\u7b56\u7565\u3002\u7b2c\u56db\u5217\u662f\u670d\u52a1\u5668\u5c06\u53d1\u9001\u56de\u7684\u54cd\u5e94\uff0c\u7b2c\u4e94\u5217\u662f\u5ba2\u6237\u7aef\u53ef\u4ee5\u6839\u636e\u63a5\u6536\u5230\u7684\u54cd\u5e94\u63a8\u65ad\u51fa\u7684\u6709\u5173\u7aef\u53e3\u7684\u4fe1\u606f\u3002<\/p>\n<h2>ICMP \u7b56\u7565<\/h2>\n<p>\u4e0e\u51b3\u5b9a\u662f\u5426\u4e22\u5f03\u6216\u62d2\u7edd\u88ab\u62d2\u7edd\u7684\u6d41\u91cf\u4e00\u6837\uff0c\u60a8\u53ef\u4ee5\u9009\u62e9\u63a5\u53d7\u6216\u62d2\u7edd\u53d1\u9001\u5230\u60a8\u7684\u670d\u52a1\u5668\u7684ICMP\u6570\u636e\u5305\u3002<\/p>\n<p>ICMP\u662f\u4e00\u4e2a\u7528\u4e8e\u8bb8\u591a\u4e8b\u60c5\u7684\u534f\u8bae\u3002\u6b63\u5982\u524d\u9762\u63d0\u5230\u7684\uff0c\u5b83\u7ecf\u5e38\u88ab\u53d1\u9001\u56de\u6765\u63d0\u4f9b\u6709\u5173\u4f7f\u7528\u5176\u4ed6\u534f\u8bae\u7684\u8bf7\u6c42\u7684\u72b6\u6001\u4fe1\u606f\u3002\u5b83\u6700\u5e38\u7528\u7684\u529f\u80fd\u4e4b\u4e00\u662f\u53d1\u9001\u548c\u54cd\u5e94\u7f51\u7edcping\u4ee5\u9a8c\u8bc1\u4e0e\u8fdc\u7a0b\u4e3b\u673a\u7684\u8fde\u63a5\u6027\u3002\u8fd8\u6709\u8bb8\u591a\u5176\u4ed6\u7528\u9014\u7684ICMP\u5e76\u4e0d\u88ab\u5e7f\u6cdb\u77e5\u6653\uff0c\u4f46\u4ecd\u7136\u5f88\u6709\u7528\u3002<\/p>\n<p>ICMP\u5305\u901a\u8fc7\u201c\u7c7b\u578b\u201d\u548c\u201c\u4ee3\u7801\u201d\u8fdb\u884c\u5206\u7c7b\u3002\u7c7b\u578b\u6307\u5b9a\u6d88\u606f\u7684\u4e00\u822c\u542b\u4e49\u3002\u4f8b\u5982\uff0c\u7c7b\u578b3\u8868\u793a\u76ee\u7684\u5730\u65e0\u6cd5\u8bbf\u95ee\u3002\u4ee3\u7801\u901a\u5e38\u7528\u4e8e\u63d0\u4f9b\u6709\u5173\u7c7b\u578b\u7684\u66f4\u591a\u4fe1\u606f\u3002\u4f8b\u5982\uff0cICMP\u7c7b\u578b3\u4ee3\u78013\u8868\u793a\u76ee\u7684\u5730\u7aef\u53e3\u4e0d\u53ef\u7528\uff0c\u800cICMP\u7c7b\u578b3\u4ee3\u78010\u8868\u793a\u65e0\u6cd5\u5230\u8fbe\u76ee\u7684\u5730\u7f51\u7edc\u3002<\/p>\n<div class=\"post-conf-note\">\n<p class=\"post-conf-desc\">\u6ce8\u610f<\/p>\n<div>\u4e00\u4e9bICMP\u7c7b\u578b\u5df2\u7ecf\u88ab\u5f03\u7528\uff0c\u56e0\u6b64\u53ef\u4ee5\u65e0\u6761\u4ef6\u5730\u963b\u6b62\u5b83\u4eec\u3002\u5176\u4e2d\u5305\u62ec\u6e90\u6291\u5236\uff08\u7c7b\u578b4\uff0c\u4ee3\u78010\uff09\u548c\u5907\u7528\u4e3b\u673a\uff08\u7c7b\u578b6\uff09\u7684ICMP\u6d88\u606f\u3002\u7c7b\u578b1\u30012\u30017\u548c15\u4ee5\u4e0a\u7684\u7c7b\u578b\u5747\u5df2\u88ab\u5f03\u7528\uff0c\u4e3a\u672a\u6765\u4f7f\u7528\u6216\u5b9e\u9a8c\u6027\u4fdd\u7559\u3002\u8bb8\u591a\u4e0a\u6e38\u9632\u706b\u5899\u6a21\u677f\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u4f1a\u5904\u7406\u8fd9\u4e9b\u6d88\u606f\u3002<\/div>\n<\/div>\n<h3>\u6839\u636e\u7f51\u7edc\u914d\u7f6e\u8fdb\u884c\u5c4f\u853d\u7684\u7c7b\u578b<\/h3>\n<p>\u67d0\u4e9bICMP\u7c7b\u578b\u5728\u7279\u5b9a\u7684\u7f51\u7edc\u914d\u7f6e\u4e2d\u5f88\u6709\u7528\uff0c\u4f46\u5728\u5176\u4ed6\u60c5\u51b5\u4e0b\u5e94\u8be5\u88ab\u963b\u6b62\u3002<\/p>\n<p>\u4f8b\u5982\uff0cICMP\u91cd\u5b9a\u5411\u6d88\u606f\uff08\u7c7b\u578b5\uff09\u53ef\u4ee5\u7528\u6765\u5c55\u793a\u4e0d\u826f\u7684\u7f51\u7edc\u8bbe\u8ba1\u3002\u5f53\u5ba2\u6237\u7aef\u6709\u66f4\u597d\u7684\u76f4\u63a5\u8def\u7531\u53ef\u7528\u65f6\uff0c\u4f1a\u53d1\u9001ICMP\u91cd\u5b9a\u5411\u6d88\u606f\u3002\u56e0\u6b64\uff0c\u5982\u679c\u8def\u7531\u5668\u63a5\u6536\u5230\u4e00\u4e2a\u9700\u8981\u8f6c\u53d1\u5230\u540c\u4e00\u7f51\u7edc\u4e0a\u53e6\u4e00\u4e2a\u4e3b\u673a\u7684\u6570\u636e\u5305\uff0c\u5b83\u4f1a\u53d1\u9001ICMP\u91cd\u5b9a\u5411\u6d88\u606f\u544a\u8bc9\u5ba2\u6237\u7aef\u5c06\u6765\u901a\u8fc7\u53e6\u4e00\u4e2a\u4e3b\u673a\u53d1\u9001\u6570\u636e\u5305\u3002<\/p>\n<p>\u5982\u679c\u60a8\u4fe1\u4efb\u60a8\u7684\u672c\u5730\u7f51\u7edc\u5e76\u4e14\u5e0c\u671b\u5728\u521d\u59cb\u914d\u7f6e\u671f\u95f4\u53d1\u73b0\u8def\u7531\u8868\u4e2d\u7684\u4f4e\u6548\u95ee\u9898\uff0c\u8fd9\u5c06\u975e\u5e38\u6709\u7528\u3002\u5728\u4e00\u4e2a\u4e0d\u53d7\u4fe1\u4efb\u7684\u7f51\u7edc\u4e0a\uff0c\u6076\u610f\u7528\u6237\u53ef\u80fd\u4f1a\u53d1\u9001ICMP\u91cd\u5b9a\u5411\uff0c\u4ee5\u64cd\u7eb5\u4e3b\u673a\u7684\u8def\u7531\u8868\u3002<\/p>\n<p>\u5728\u67d0\u4e9b\u7f51\u7edc\u4e2d\u6709\u7528\u4f46\u5728\u5176\u4ed6\u7f51\u7edc\u4e2d\u6f5c\u5728\u6709\u5bb3\u7684\u5176\u4ed6ICMP\u7c7b\u578b\u662fICMP\u8def\u7531\u5668\u5e7f\u544a\uff08\u7c7b\u578b9\uff09\u548c\u8def\u7531\u5668\u8bf7\u6c42\uff08\u7c7b\u578b10\uff09\u6570\u636e\u5305\u3002\u8def\u7531\u5668\u5e7f\u544a\u548c\u8bf7\u6c42\u6570\u636e\u5305\u662f\u4f5c\u4e3aIRDP\uff08ICMP\u4e92\u8054\u7f51\u8def\u7531\u5668\u53d1\u73b0\u534f\u8bae\uff09\u7684\u4e00\u90e8\u5206\u4f7f\u7528\u7684\uff0c\u8be5\u7cfb\u7edf\u5141\u8bb8\u4e3b\u673a\u5728\u542f\u52a8\u6216\u52a0\u5165\u7f51\u7edc\u65f6\u52a8\u6001\u53d1\u73b0\u53ef\u7528\u7684\u8def\u7531\u5668\u3002<\/p>\n<p>\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u5bf9\u4e8e\u4e3b\u673a\u6765\u8bf4\uff0c\u6700\u597d\u914d\u7f6e\u9759\u6001\u8def\u7531\u4ee5\u4f9b\u5176\u4f7f\u7528\u7684\u7f51\u5173\u3002\u8fd9\u4e9b\u6570\u636e\u5305\u5e94\u8be5\u5728\u4e0eICMP\u91cd\u5b9a\u5411\u6570\u636e\u5305\u76f8\u540c\u7684\u60c5\u51b5\u4e0b\u88ab\u63a5\u53d7\u3002\u5b9e\u9645\u4e0a\uff0c\u7531\u4e8e\u4e3b\u673a\u4e0d\u77e5\u9053\u4efb\u4f55\u5df2\u53d1\u73b0\u8def\u7531\u7684\u9996\u9009\u8def\u7ebf\uff0c\u56e0\u6b64\u901a\u5e38\u9700\u8981\u5728\u53d1\u73b0\u540e\u76f4\u63a5\u53d1\u9001\u91cd\u5b9a\u5411\u6d88\u606f\u3002\u5982\u679c\u60a8\u6ca1\u6709\u8fd0\u884c\u53d1\u9001\u8def\u7531\u5668\u8bf7\u6c42\u6570\u636e\u5305\u6216\u6839\u636e\u5e7f\u544a\u6570\u636e\u5305\uff08\u5982rdisc\uff09\u4fee\u6539\u8def\u7531\u7684\u670d\u52a1\uff0c\u60a8\u53ef\u4ee5\u5b89\u5168\u5730\u963b\u6b62\u8fd9\u4e9b\u6570\u636e\u5305\u3002<\/p>\n<h3>\u5e38\u5e38\u53ef\u5141\u8bb8\u7684\u7c7b\u578b<\/h3>\n<p>\u5982\u679c\u4f60\u60f3\u8981\u66f4\u52a0\u8c28\u614e\uff0c\u4ee5\u4e0b\u662f\u901a\u5e38\u5b89\u5168\u5141\u8bb8\u7684ICMP\u7c7b\u578b\uff0c\u4f46\u4f60\u53ef\u80fd\u60f3\u8981\u7981\u7528\u5b83\u4eec\u3002<\/p>\n<ul class=\"post-ul\">\n<li>\u7c7b\u578b8 \u2014 \u56de\u663e\u8bf7\u6c42\uff1a\u8fd9\u4e9b\u662f\u9488\u5bf9\u60a8\u670d\u52a1\u5668\u7684ping\u8bf7\u6c42\u3002\u901a\u5e38\u5141\u8bb8\u8fd9\u4e9b\u8bf7\u6c42\u662f\u5b89\u5168\u7684\uff08\u62d2\u7edd\u8fd9\u4e9b\u6570\u636e\u5305\u5e76\u4e0d\u80fd\u9690\u85cf\u60a8\u7684\u670d\u52a1\u5668\uff0c\u56e0\u4e3a\u7528\u6237\u6709\u5f88\u591a\u5176\u4ed6\u65b9\u6cd5\u53ef\u4ee5\u53d1\u73b0\u60a8\u7684\u4e3b\u673a\u662f\u5426\u5728\u7ebf\uff09\uff0c\u4f46\u5982\u679c\u60a8\u613f\u610f\uff0c\u53ef\u4ee5\u963b\u6b62\u5b83\u4eec\u6216\u9650\u5236\u60a8\u54cd\u5e94\u7684\u6e90\u5730\u5740\u3002<\/li>\n<li>\u7c7b\u578b13 \u2014 \u65f6\u95f4\u6233\u8bf7\u6c42\uff1a\u8fd9\u4e9b\u6570\u636e\u5305\u53ef\u88ab\u5ba2\u6237\u7aef\u7528\u4e8e\u6536\u96c6\u5ef6\u8fdf\u4fe1\u606f\u3002\u5b83\u4eec\u53ef\u7528\u4e8e\u67d0\u4e9b\u64cd\u4f5c\u7cfb\u7edf\u6307\u7eb9\u8bc6\u522b\u6280\u672f\uff0c\u56e0\u6b64\u60a8\u53ef\u4ee5\u963b\u6b62\u5b83\u4eec\u6216\u9650\u5236\u60a8\u54cd\u5e94\u7684\u5730\u5740\u8303\u56f4\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u7c7b\u578b\u901a\u5e38\u53ef\u4ee5\u901a\u8fc7\u914d\u7f6e\u9632\u706b\u5899\u5141\u8bb8\u54cd\u5e94\u5176\u53d1\u51fa\u7684\u8bf7\u6c42\uff08\u901a\u8fc7\u4f7f\u7528conntrack\u6a21\u5757\u5141\u8bb8\u5df2\u5efa\u7acb\u548c\u76f8\u5173\u7684\u6d41\u91cf\uff09\u800c\u65e0\u9700\u660e\u786e\u89c4\u5b9a\u3002<\/p>\n<ul class=\"post-ul\">\n<li>\u7c7b\u578b0 \u2014 \u56de\u663e\u56de\u590d\uff1a\u8fd9\u4e9b\u662f\u5bf9\u56de\u663e\u8bf7\u6c42\uff08ping\uff09\u7684\u54cd\u5e94\u3002<\/li>\n<li>\u7c7b\u578b3 \u2014 \u76ee\u7684\u5730\u4e0d\u53ef\u8fbe\uff1a\u5408\u6cd5\u7684\u76ee\u7684\u5730\u4e0d\u53ef\u8fbe\u6570\u636e\u5305\u662f\u60a8\u7684\u670d\u52a1\u5668\u521b\u5efa\u7684\u8bf7\u6c42\u7684\u54cd\u5e94\uff0c\u8868\u660e\u6570\u636e\u5305\u65e0\u6cd5\u9001\u8fbe\u3002<\/li>\n<li>\u7c7b\u578b11 \u2014 \u8d85\u65f6\uff1a\u5982\u679c\u60a8\u7684\u670d\u52a1\u5668\u751f\u6210\u7684\u6570\u636e\u5305\u5728\u5230\u8fbe\u76ee\u7684\u5730\u4e4b\u524d\u56e0TTL\u503c\u8d85\u8fc7\u800c\u6b7b\u4ea1\uff0c\u5219\u8fd4\u56de\u6b64\u8bca\u65ad\u9519\u8bef\u3002<\/li>\n<li>\u7c7b\u578b12 \u2014 \u53c2\u6570\u95ee\u9898\uff1a\u8fd9\u610f\u5473\u7740\u60a8\u7684\u670d\u52a1\u5668\u53d1\u51fa\u7684\u4f20\u51fa\u6570\u636e\u5305\u683c\u5f0f\u9519\u8bef\u3002<\/li>\n<li>\u7c7b\u578b14 \u2014 \u65f6\u95f4\u6233\u54cd\u5e94\uff1a\u8fd9\u4e9b\u662f\u60a8\u7684\u670d\u52a1\u5668\u751f\u6210\u7684\u65f6\u95f4\u6233\u67e5\u8be2\u7684\u54cd\u5e94\u3002<\/li>\n<\/ul>\n<p>\u4e00\u4e9b\u5b89\u5168\u4e13\u5bb6\u4ecd\u7136\u5efa\u8bae\u963b\u6b62\u6240\u6709\u4f20\u5165\u7684ICMP\u6d41\u91cf\uff0c\u7136\u800c\u73b0\u5728\u8bb8\u591a\u4eba\u9f13\u52b1\u667a\u80fd\u7684ICMP\u63a5\u6536\u7b56\u7565\u3002\u8fd9\u4e24\u4e2aStackexchange\u5e16\u5b50\u4f1a\u63d0\u4f9b\u66f4\u591a\u7684\u4fe1\u606f\u3002<\/p>\n<h2>\u8fde\u63a5\u9650\u5236\u548c\u901f\u7387\u9650\u5236<\/h2>\n<p>\u5bf9\u4e8e\u67d0\u4e9b\u670d\u52a1\u548c\u901a\u4fe1\u6a21\u5f0f\uff0c\u4f60\u53ef\u80fd\u53ea\u5e0c\u671b\u5728\u5ba2\u6237\u4e0d\u6ee5\u7528\u8be5\u8bbf\u95ee\u6743\u9650\u65f6\u624d\u5141\u8bb8\u8bbf\u95ee\u3002\u9650\u5236\u8d44\u6e90\u4f7f\u7528\u7684\u4e24\u79cd\u65b9\u5f0f\u662f\u8fde\u63a5\u9650\u5236\u548c\u901f\u7387\u9650\u5236\u3002<\/p>\n<h3>\u8fde\u63a5\u9650\u5236<\/h3>\n<p>\u4f7f\u7528\u7c7b\u4f3cconnlimit\u7684\u6269\u5c55\u53ef\u4ee5\u5b9e\u73b0\u8fde\u63a5\u9650\u5236\uff0c\u4ee5\u68c0\u67e5\u5ba2\u6237\u7aef\u6253\u5f00\u7684\u6d3b\u52a8\u8fde\u63a5\u6570\u91cf\u3002\u8fd9\u53ef\u4ee5\u7528\u4e8e\u9650\u5236\u540c\u65f6\u5141\u8bb8\u7684\u8fde\u63a5\u6570\u3002\u5982\u679c\u4f60\u51b3\u5b9a\u5b9e\u65bd\u8fde\u63a5\u9650\u5236\uff0c\u4f60\u9700\u8981\u505a\u51fa\u4e00\u4e9b\u51b3\u7b56\u3002<\/p>\n<ul class=\"post-ul\">\n<li>\u4f60\u662f\u5728\u6bcf\u4e2a\u5730\u5740\u3001\u6bcf\u4e2a\u7f51\u7edc\u8fd8\u662f\u5168\u5c40\u57fa\u7840\u4e0a\u8fdb\u884c\u9650\u5236\uff1f<\/li>\n<li>\u4f60\u662f\u5339\u914d\u5e76\u9650\u5236\u7279\u5b9a\u670d\u52a1\u7684\u6d41\u91cf\u8fd8\u662f\u6574\u4e2a\u670d\u52a1\u5668\u7684\u6d41\u91cf\uff1f<\/li>\n<\/ul>\n<p>\u53ef\u4ee5\u6309\u7167\u4e3b\u673a\u4e3a\u5355\u4f4d\u9650\u5236\u8fde\u63a5\uff0c\u6216\u8005\u901a\u8fc7\u63d0\u4f9b\u7f51\u7edc\u524d\u7f00\uff08\u4f8b\u5982\u4e00\u4e2a\u6574\u4e2a\u7ec4\u7ec7\u7684IP\u5730\u5740\u8303\u56f4\uff09\u6765\u9650\u5236\u7f51\u7edc\u6bb5\u7684\u8fde\u63a5\u6570\u91cf\u3002\u60a8\u8fd8\u53ef\u4ee5\u4e3a\u670d\u52a1\u6216\u6574\u4e2a\u8ba1\u7b97\u673a\u8bbe\u7f6e\u5168\u5c40\u6700\u5927\u8fde\u63a5\u6570\u3002\u8bf7\u8bb0\u4f4f\uff0c\u53ef\u4ee5\u6df7\u5408\u4f7f\u7528\u8fd9\u4e9b\u9009\u9879\uff0c\u521b\u5efa\u66f4\u590d\u6742\u7684\u7b56\u7565\u6765\u63a7\u5236\u8fde\u63a5\u6570\u3002<\/p>\n<h3>\u901f\u7387\u9650\u5236<\/h3>\n<p>\u901f\u7387\u9650\u5236\u5141\u8bb8\u60a8\u5236\u5b9a\u89c4\u5219\u6765\u63a7\u5236\u670d\u52a1\u5668\u63a5\u53d7\u6d41\u91cf\u7684\u901f\u7387\u6216\u9891\u7387\u3002\u53ef\u4f7f\u7528\u591a\u79cd\u4e0d\u540c\u7684\u9632\u706b\u5899\u6269\u5c55\u6765\u8fdb\u884c\u901f\u7387\u9650\u5236\uff0c\u5305\u62eclimit\u3001hashlimit\u548crecent\u3002\u60a8\u9009\u62e9\u4f7f\u7528\u7684\u6269\u5c55\u4e3b\u8981\u53d6\u51b3\u4e8e\u60a8\u5e0c\u671b\u9650\u5236\u6d41\u91cf\u7684\u65b9\u5f0f\u3002<\/p>\n<p>\u9650\u5236\u6269\u5c55\u5c06\u5bfc\u81f4\u76f8\u5173\u89c4\u5219\u5728\u8fbe\u5230\u9650\u5236\u503c\u4e4b\u524d\u4e00\u76f4\u751f\u6548\uff0c\u4e4b\u540e\u5c06\u4e22\u5f03\u8fdb\u4e00\u6b65\u7684\u6570\u636e\u5305\u3002\u4f8b\u5982\uff0c\u6bcf\u79d2\u9650\u5236\u4e3a5\u4e2a\u6570\u636e\u5305\uff0c\u4e4b\u540e\u5c06\u4e0d\u518d\u5339\u914d\u8be5\u89c4\u5219\u3002\u8fd9\u5bf9\u4e8e\u8bbe\u7f6e\u5168\u5c40\u670d\u52a1\u901f\u7387\u9650\u5236\u975e\u5e38\u6709\u7528\u3002\u60a8\u8fd8\u53ef\u4ee5\u90e8\u7f72\u7c7b\u4f3cFail2ban\u7684\u9644\u52a0\u670d\u52a1\uff0c\u4ee5\u963b\u6b62\u91cd\u590d\u7684\u8fde\u63a5\u5c1d\u8bd5\u3002<\/p>\n<p>hashlimit\u6269\u5c55\u66f4\u52a0\u7075\u6d3b\uff0c\u5b83\u5141\u8bb8\u60a8\u6307\u5b9aiptables\u4f1a\u8fdb\u884c\u54c8\u5e0c\u4ee5\u8bc4\u4f30\u5339\u914d\u7684\u4e00\u4e9b\u503c\u3002\u4f8b\u5982\uff0c\u5b83\u53ef\u4ee5\u67e5\u770b\u6e90\u5730\u5740\u3001\u6e90\u7aef\u53e3\u3001\u76ee\u6807\u5730\u5740\u3001\u76ee\u6807\u7aef\u53e3\u4e2d\u7684\u4e00\u4e2a\u6216\u8fd9\u56db\u4e2a\u503c\u7684\u7ec4\u5408\u6765\u8bc4\u4f30\u6bcf\u4e2a\u6761\u76ee\u3002\u5b83\u53ef\u4ee5\u6309\u5305\u6216\u6309\u63a5\u6536\u7684\u5b57\u8282\u9650\u5236\u3002\u8fd9\u63d0\u4f9b\u4e86\u7075\u6d3b\u7684\u6309\u5ba2\u6237\u7aef\u6216\u6309\u670d\u52a1\u8fdb\u884c\u901f\u7387\u9650\u5236\u7684\u529f\u80fd\u3002<\/p>\n<p>\u6700\u8fd1\u7684\u6269\u5c55\u529f\u80fd\u4f1a\u52a8\u6001\u5730\u5c06\u5ba2\u6237\u7aef\u7684IP\u5730\u5740\u6dfb\u52a0\u5230\u5217\u8868\u4e2d\uff0c\u6216\u5728\u89c4\u5219\u5339\u914d\u65f6\u8fdb\u884c\u68c0\u67e5\u73b0\u6709\u5217\u8868\u3002\u8fd9\u6837\u4f60\u5c31\u53ef\u4ee5\u5c06\u9650\u5236\u903b\u8f91\u5206\u5e03\u5728\u8bb8\u591a\u4e0d\u540c\u7684\u89c4\u5219\u4e2d\uff0c\u5e94\u5bf9\u590d\u6742\u7684\u6a21\u5f0f\u3002\u5b83\u53ef\u4ee5\u50cf\u5176\u4ed6\u9650\u5236\u5668\u4e00\u6837\u6307\u5b9a\u4e00\u4e2a\u547d\u4e2d\u6b21\u6570\u548c\u65f6\u95f4\u8303\u56f4\uff0c\u4f46\u5982\u679c\u6709\u989d\u5916\u7684\u6d41\u91cf\u51fa\u73b0\uff0c\u5b83\u8fd8\u53ef\u4ee5\u91cd\u7f6e\u65f6\u95f4\u8303\u56f4\uff0c\u5f3a\u5236\u5ba2\u6237\u7aef\u505c\u6b62\u6240\u6709\u6d41\u91cf\uff0c\u4ee5\u8fdb\u884c\u9650\u5236\u3002<\/p>\n<h2>\u5355\u4f53\u5316\u7ba1\u7406 VS \u57fa\u4e8e\u94fe\u6761\u7684\u7ba1\u7406<\/h2>\n<p>\u6240\u6709iptables\u548cnftables\u9632\u706b\u5899\u7b56\u7565\u672c\u8d28\u4e0a\u90fd\u5efa\u7acb\u5728\u6269\u5c55\u5185\u7f6e\u94fe\u7684\u57fa\u7840\u4e0a\u3002\u8d77\u521d\uff0c\u8fd9\u901a\u5e38\u610f\u5473\u7740\u66f4\u6539\u73b0\u6709\u94fe\u7684\u9ed8\u8ba4\u7b56\u7565\u5e76\u6dfb\u52a0\u89c4\u5219\u3002\u5bf9\u4e8e\u66f4\u590d\u6742\u7684\u9632\u706b\u5899\uff0c\u6269\u5c55\u7ba1\u7406\u6846\u67b6\u901a\u8fc7\u521b\u5efa\u989d\u5916\u7684\u94fe\u901a\u5e38\u662f\u4e00\u4e2a\u597d\u4e3b\u610f\u3002<\/p>\n<p>\u7528\u6237\u521b\u5efa\u7684\u94fe\u79f0\u4e3a\u6b21\u94fe\u63a5\uff0c\u4e0e\u5b83\u4eec\u8d77\u6e90\u94fe\u5bc6\u5207\u76f8\u5173\u3002\u7528\u6237\u521b\u5efa\u7684\u94fe\u6ca1\u6709\u9ed8\u8ba4\u7b56\u7565\uff0c\u6240\u4ee5\u5982\u679c\u4e00\u4e2a\u6570\u636e\u5305\u7a7f\u8fc7\u7528\u6237\u521b\u5efa\u7684\u94fe\uff0c\u5b83\u5c06\u8fd4\u56de\u5230\u8c03\u7528\u7684\u94fe\u5e76\u7ee7\u7eed\u8bc4\u4f30\u3002\u56e0\u6b64\uff0c\u7528\u6237\u521b\u5efa\u7684\u94fe\u4e3b\u8981\u7528\u4e8e\u7ec4\u7ec7\u76ee\u7684\uff0c\u4f7f\u89c4\u5219\u5339\u914d\u6761\u4ef6\u66f4\u6613\u4e8e\u7ef4\u62a4\uff0c\u5e76\u901a\u8fc7\u5206\u5272\u5339\u914d\u6761\u4ef6\u6765\u63d0\u9ad8\u53ef\u8bfb\u6027\u3002<\/p>\n<p>\u5982\u679c\u4f60\u53d1\u73b0\u81ea\u5df1\u9700\u8981\u4e3a\u5927\u91cf\u89c4\u5219\u91cd\u590d\u4f7f\u7528\u67d0\u4e9b\u5339\u914d\u6761\u4ef6\uff0c\u90a3\u4e48\u521b\u5efa\u4e00\u4e2a\u5e26\u6709\u5171\u4eab\u5339\u914d\u6761\u4ef6\u7684\u8df3\u8f6c\u89c4\u5219\u5230\u4e00\u4e2a\u65b0\u7684\u94fe\u53ef\u80fd\u662f\u503c\u5f97\u7684\u3002\u5728\u65b0\u7684\u94fe\u4e2d\uff0c\u4f60\u53ef\u4ee5\u6dfb\u52a0\u90a3\u7ec4\u7701\u7565\u4e86\u5197\u4f59\u5339\u914d\u6761\u4ef6\u7684\u89c4\u5219\u3002<\/p>\n<p>\u5c06\u6240\u6709\u89c4\u5219\u6574\u5408\u5230\u5185\u7f6e\u94fe\u4e2d\uff0c\u8fd8\u662f\u521b\u5efa\u548c\u5229\u7528\u989d\u5916\u7684\u94fe\uff0c\u8fd9\u4e2a\u51b3\u5b9a\u5c06\u53d6\u51b3\u4e8e\u4f60\u7684\u89c4\u5219\u96c6\u6709\u591a\u590d\u6742\u3002<\/p>\n<h2>\u7ed3\u8bba<\/h2>\n<p>\u5f53\u4f60\u8bbe\u8ba1\u670d\u52a1\u5668\u7684\u9632\u706b\u5899\u7b56\u7565\u65f6\uff0c\u4f60\u73b0\u5728\u5e94\u8be5\u5bf9\u4f60\u5c06\u8981\u505a\u51fa\u7684\u51b3\u7b56\u6709\u66f4\u597d\u7684\u7406\u89e3\u3002\u901a\u5e38\uff0c\u6295\u5165\u5230\u9632\u706b\u5899\u4e2d\u7684\u65f6\u95f4\u4e3b\u8981\u96c6\u4e2d\u5728\u521d\u59cb\u8bbe\u7f6e\u4e0a\u3002\u5c3d\u7ba1\u53ef\u80fd\u9700\u8981\u4e00\u4e9b\u65f6\u95f4\u548c\u5b9e\u9a8c\u6765\u627e\u51fa\u6700\u9002\u5408\u4f60\u9700\u6c42\u7684\u7b56\u7565\uff0c\u4f46\u8fd9\u6837\u505a\u5c06\u4f7f\u4f60\u5bf9\u670d\u52a1\u5668\u7684\u5b89\u5168\u6027\u62e5\u6709\u66f4\u591a\u63a7\u5236\u6743\u3002<\/p>\n<p>\u5982\u679c\u4f60\u60f3\u4e86\u89e3\u5173\u4e8e\u9632\u706b\u5899\u548ciptables\u7684\u66f4\u591a\u4fe1\u606f\uff0c\u8bf7\u67e5\u770b\u4ee5\u4e0b\u6587\u7ae0\uff1a<\/p>\n<ul class=\"post-ul\">\n<li><a href=\"#\">Iptables \u9632\u706b\u5899\u7684\u5de5\u4f5c\u539f\u7406<\/a><\/li>\n<li><a href=\"#\">\u6df1\u5165\u63a2\u8ba8 Iptables \u548c Netfilter \u67b6\u6784<\/a><\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u6307\u5357\u53ef\u4ee5\u5e2e\u52a9\u60a8\u6267\u884c\u6240\u9700\u7b56\u7565\u3002\u9009\u62e9\u4e0e\u60a8\u7684\u9632\u706b\u5899\u76f8\u5339\u914d\u7684\u6307\u5357\u5f00\u59cb\u64cd\u4f5c\uff1a<\/p>\n<ul class=\"post-ul\">\n<li><a href=\"#\">\u5982\u4f55\u5728 Ubuntu 22.04 \u4e0a\u4f7f\u7528 Nftables \u8bbe\u7f6e\u9632\u706b\u5899<\/a><\/li>\n<li><a href=\"#\">\u5982\u4f55\u5728 Ubuntu 22.04 \u4e0a\u4f7f\u7528 UFW \u8bbe\u7f6e\u9632\u706b\u5899<\/a><\/li>\n<li><a href=\"#\">\u5982\u4f55\u5728 Rocky Linux 9 \u4e0a\u4f7f\u7528 FirewallD \u8bbe\u7f6e\u9632\u706b\u5899<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u5f15\u8a00 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