{"id":125988,"date":"2023-08-22T16:45:33","date_gmt":"2023-08-22T08:45:33","guid":{"rendered":"http:\/\/www.idc.net\/help\/125988\/"},"modified":"2023-08-22T16:45:33","modified_gmt":"2023-08-22T08:45:33","slug":"linux%e9%98%b2%e7%81%ab%e5%a2%99%e6%9b%b4%e4%bd%b3%e5%ae%9e%e8%b7%b5%ef%bc%9a%e9%83%a8%e7%bd%b2%e8%a7%84%e5%88%99%e8%af%a6%e8%a7%a3-linux%e9%98%b2%e7%81%ab%e5%a2%99%e9%83%a8%e7%bd%b2%e8%a7%84","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/125988\/","title":{"rendered":"Linux\u9632\u706b\u5899\u66f4\u4f73\u5b9e\u8df5\uff1a\u90e8\u7f72\u89c4\u5219\u8be6\u89e3 (linux\u9632\u706b\u5899\u90e8\u7f72\u89c4\u5219\u8be6\u60c5)"},"content":{"rendered":"<p>Linux\u9632\u706b\u5899\u662f\u4e00\u9879\u5fc5\u4e0d\u53ef\u5c11\u7684\u5b89\u5168\u4fdd\u969c\uff0c\u5b83\u53ef\u4ee5\u9632\u6b62\u672a\u6388\u6743\u4eba\u5458\u5bf9\u64cd\u4f5c\u7cfb\u7edf\u8fdb\u884c\u653b\u51fb\u548c\u5165\u4fb5\u3002\u4f46\u662f\uff0c\u9632\u706b\u5899\u89c4\u5219\u7684\u90e8\u7f72\u548c\u7ba1\u7406\u9700\u8981\u7279\u522b\u8c28\u614e\u548c\u6ce8\u610f\uff0c\u5426\u5219\u53ef\u80fd\u4f1a\u5f71\u54cd\u7cfb\u7edf\u6027\u80fd\u548c\u5b89\u5168\u6027\u3002\u672c\u6587\u5c06\u4ecb\u7ecdLinux\u9632\u706b\u5899\u7684\u66f4\u4f73\u5b9e\u8df5\u548c\u89c4\u5219\u90e8\u7f72\u8be6\u89e3\uff0c\u65e8\u5728\u5e2e\u52a9\u7528\u6237\u6b63\u786e\u914d\u7f6e\u9632\u706b\u5899\u5e76\u63d0\u9ad8\u7cfb\u7edf\u5b89\u5168\u6027\u3002<\/p>\n<p>\u4e00\u3001\u4e86\u89e3Linux\u9632\u706b\u5899\u57fa\u672c\u539f\u7406<\/p>\n<p>Linux\u9632\u706b\u5899\u662f\u57fa\u4e8eiptables\u5b9e\u73b0\u7684\uff0ciptables\u662fLinux\u7cfb\u7edf\u4e2d\u4e00\u4e2a\u6784\u5efa\u5728Netfilter\u6a21\u5757\u4e4b\u4e0a\u7684\u9632\u706b\u5899\u6bb5\uff08packet\uff0c\u5373\u6570\u636e\u5305\uff09\u8fc7\u6ee4\u5668\u3002iptables\u53ef\u4ee5\u5e2e\u52a9\u4f60\u4fdd\u62a4\u4f60\u7684\u670d\u52a1\u5668\u5b89\u5168\uff0c\u5185\u7f6e\u7684Netfilter\u6a21\u5757\u53ef\u4ee5\u68c0\u67e5\u8f93\u5165\u548c\u8f93\u51fa\u6d41\u7684IP\u6570\u636e\u5305\u3001\u8fc7\u7a0b\u8fde\u63a5\u3001TCP\u3001UDP\u7b49\u534f\u8bae\uff0c\u5e76\u80fd\u591f\u5c06\u5b83\u4eec\u8f6c\u53d1\u5230\u4e0d\u540c\u7684\u94fe\uff0c\u6bd4\u5982\u8bf4INPUT\uff08\u63a5\u6536\u6570\u636e\u5305\uff09\u3001FORWARD\uff08\u8f6c\u53d1\u6570\u636e\u5305\uff09\u3001OUTPUT\uff08\u53d1\u9001\u6570\u636e\u5305\uff09\u3002\u6b64\u5916\uff0ciptables\u8fd8\u53ef\u4ee5\u5904\u7406\u6e90\u5730\u5740\u548c\u76ee\u6807\u5730\u5740\u3001\u6e90\u7aef\u53e3\u548c\u76ee\u6807\u7aef\u53e3\u3001\u62a5\u6587\u5185\u5bb9\u7b49\u4fe1\u606f\uff0c\u4ece\u800c\u6709\u6548\u5730\u9632\u6b62\u975e\u6cd5\u5165\u4fb5\u548c\u653b\u51fb\u3002<\/p>\n<p>\u4e8c\u3001Linux\u9632\u706b\u5899\u66f4\u4f73\u5b9e\u8df5<\/p>\n<p>1.\u5173\u95ed\u4e0d\u5fc5\u8981\u7684\u7aef\u53e3<\/p>\n<p>\u4e3a\u4e86\u52a0\u5f3a\u7cfb\u7edf\u5b89\u5168\uff0c\u4f60\u5e94\u8be5\u5173\u95ed\u4e00\u4e9b\u4e0d\u5fc5\u8981\u7684\u7aef\u53e3\uff08\u4e0d\u4f7f\u7528\u7684\u7aef\u53e3\uff09\uff0c\u8fd9\u4e9b\u4e0d\u5fc5\u8981\u7684\u7aef\u53e3\u4f1a\u589e\u52a0\u7cfb\u7edf\u88ab\u653b\u51fb\u7684\u53ef\u80fd\u6027\uff0c\u5e76\u964d\u4f4e\u7cfb\u7edf\u7684\u5b89\u5168\u6027\u3002<\/p>\n<p>2.\u914d\u7f6e\u767d\u540d\u5355<\/p>\n<p>\u914d\u7f6e\u767d\u540d\u5355\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u8ba9\u4f60\u6388\u6743\u4f60\u4fe1\u4efb\u7684IP\u6216\u8005MAC\u5730\u5740\u6765\u8bbf\u95ee\u4f60\u7684\u7cfb\u7edf\uff0c\u540c\u65f6\u53ef\u4ee5\u963b\u6b62\u672a\u6388\u6743\u7684\u8bbf\u95ee\u3002\u4f60\u5e94\u8be5\u5c06\u4f60\u7684\u7cfb\u7edf\u914d\u7f6e\u4e3a\u53ea\u5141\u8bb8\u6388\u6743\u7684\u5730\u5740\u6765\u8bbf\u95ee\uff0c\u8fd9\u6837\u53ef\u4ee5\u9632\u6b62\u9ed1\u5ba2\u653b\u51fb\u3002<\/p>\n<p>3.\u7981\u6b62ping\u7f51\u7edc<\/p>\n<p>ping\u547d\u4ee4\u53ef\u4ee5\u8ba9\u4f60\u6d4b\u8bd5\u7f51\u7edc\u662f\u5426\u53ef\u8fbe\uff0c\u4f46\u662f\u540c\u65f6\u4e5f\u4e3a\u653b\u51fb\u8005\u63d0\u4f9b\u4e86\u975e\u5e38\u597d\u7684\u653b\u51fb\u673a\u4f1a\uff0c\u56e0\u4e3aping\u547d\u4ee4\u53ef\u4ee5\u5e2e\u52a9\u653b\u51fb\u8005\u786e\u5b9a\u7f51\u7edc\u7684\u62d3\u6251\u7ed3\u6784\u3002\u4e3a\u4e86\u52a0\u5f3a\u7cfb\u7edf\u5b89\u5168\uff0c\u5e94\u8be5\u7981\u6b62ping\u7f51\u7edc\u3002<\/p>\n<p>4.\u9632\u6b62SYN Flood\u653b\u51fb<\/p>\n<p>SYN Flood\u653b\u51fb\u662f\u4e00\u79cd\u7f51\u7edc\u653b\u51fb\u65b9\u5f0f\uff0c\u653b\u51fb\u8005\u5229\u7528TCP\/IP\u534f\u8bae\u4e2dTCP\u4e09\u6b21\u63e1\u624b\u7684\u6f0f\u6d1e\u8fdb\u884c\u653b\u51fb\uff0c\u76ee\u7684\u662f\u6d88\u8017\u670d\u52a1\u5668\u7684\u8d44\u6e90\uff0c\u4ece\u800c\u4f7f\u7cfb\u7edf\u5d29\u6e83\u6216\u8005\u62d2\u7edd\u670d\u52a1\uff08DDOS\u653b\u51fb\uff09\u3002\u4e3a\u4e86\u9632\u6b62SYN Flood\u653b\u51fb\uff0c\u53ef\u4ee5\u901a\u8fc7limit\u6a21\u5757\u9650\u5236\u6bcf\u4e2aIP\u5730\u5740\u7684\u8fde\u63a5\u6570\uff0c\u540c\u65f6\u53ef\u4ee5\u589e\u52a0TCP SYN Cookies\u6765\u9632\u6b62\u653b\u51fb\u3002<\/p>\n<p>5.\u9650\u5236SSH\u8bbf\u95ee<\/p>\n<p>SSH\u662f\u4e00\u79cd\u8fdc\u7a0b\u767b\u5f55\u534f\u8bae\uff0c\u4e3a\u4e86\u9632\u6b62\u9ed1\u5ba2\u653b\u51fb\u548c\u66b4\u529b\u7834\u89e3\uff0c\u4f60\u5e94\u8be5\u9650\u5236SSH\u8bbf\u95ee\uff0c\u4f8b\u5982\u9650\u5236\u53ea\u6709\u6700\u5c11\u7684\u6388\u6743\u7528\u6237\u624d\u80fd\u4f7f\u7528SSH\uff0c\u6216\u8005\u5f00\u542fSSH\u7aef\u53e3\u79fb\u52a8\uff0c\u5bf9\u4e8e\u9700\u8981\u4f7f\u7528SSH\u7684\u7528\u6237\u5e94\u8be5\u5f3a\u5236\u4f7f\u7528\u516c\u94a5\u8eab\u4efd\u9a8c\u8bc1\uff0c\u800c\u4e0d\u662f\u4f7f\u7528\u5bc6\u7801\u8eab\u4efd\u9a8c\u8bc1\u3002<\/p>\n<p>\u4e09\u3001Linux\u9632\u706b\u5899\u89c4\u5219\u90e8\u7f72\u8be6\u89e3<\/p>\n<p>\u5728Linux\u9632\u706b\u5899\u90e8\u7f72\u7684\u8fc7\u7a0b\u4e2d\uff0c\u7528\u6237\u5fc5\u987b\u8981\u9075\u5b88\u4e00\u5b9a\u7684\u89c4\u5219\u3002\u4ee5\u4e0b\u662fLinux\u9632\u706b\u5899\u90e8\u7f72\u89c4\u5219\u7684\u8be6\u89e3\uff1a<\/p>\n<p>1.\u6c38\u4e45\u4fdd\u5b58iptables\u89c4\u5219<\/p>\n<p>\u5728Linux\u9632\u706b\u5899\u914d\u7f6e\u5b8c\u6210\u4e4b\u540e\u5e94\u8be5\u6c38\u4e45\u4fdd\u5b58iptables\u89c4\u5219\uff0c\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u7cfb\u7edf\u91cd\u542f\u540e\u4e22\u5931\u89c4\u5219\uff0c\u53ef\u4ee5\u4f7f\u7528\u547d\u4ee4iptables-save\u6765\u4fdd\u5b58\u89c4\u5219\u3002<\/p>\n<p>2.\u9ed8\u8ba4\u89c4\u5219\u8bbe\u7f6e<\/p>\n<p>\u9ed8\u8ba4\u89c4\u5219\u5373\u4e3a\u89c4\u5219\u94fe\u4e2d\u4e0d\u5305\u542b\u7684\u4efb\u4f55\u6570\u636e\u5305\uff0c\u5e94\u8be5\u8bbe\u7f6eiptables\u786e\u8ba4DROP\u7b56\u7565\u548ciptables\u8fd8\u539f\u7b56\u7565\uff0c\u4e3a\u4e86\u589e\u5f3a\u7cfb\u7edf\u5b89\u5168\uff0c\u53ef\u4ee5\u5c06\u9ed8\u8ba4\u89c4\u5219\u8bbe\u7f6e\u4e3aDROP\uff0c\u8fd9\u6837\u80fd\u591f\u9632\u6b62\u672a\u6388\u6743\u7684\u5165\u4fb5\u548c\u653b\u51fb\u3002<\/p>\n<p>3.iptables\u89c4\u5219\u5220\u9664<\/p>\n<p>\u5728\u5220\u9664iptables\u89c4\u5219\u65f6\uff0c\u5e94\u8be5\u4f7f\u7528\u884c\u53f7\u6765\u5220\u9664\u89c4\u5219\uff0c\u800c\u4e0d\u662f\u4f7f\u7528\u89c4\u5219\u5185\u5bb9\u3002\u4f7f\u7528\u884c\u53f7\u53ef\u4ee5\u907f\u514d\u8bef\u5220\u89c4\u5219\uff0c\u4fdd\u8bc1\u5b89\u5168\u6027\u3002<\/p>\n<p>4.iptables\u89c4\u5219\u4f18\u5316<\/p>\n<p>\u5728Linux\u9632\u706b\u5899\u90e8\u7f72\u540e\uff0c\u53ef\u4ee5\u5bf9iptables\u89c4\u5219\u8fdb\u884c\u4f18\u5316\uff0c\u4ee5\u63d0\u9ad8\u9632\u706b\u5899\u6027\u80fd\u3002\u6bd4\u5982\u8bf4\u53ef\u4ee5\u5bf9\u8f93\u5165\u548c\u8f93\u51fa\u89c4\u5219\u8fdb\u884c\u4f18\u5316\uff0c\u5c06\u7ecf\u5e38\u8bbf\u95ee\u7684\u670d\u52a1\u5668\u5730\u5740\u653e\u5230\u5f00\u5934\uff0c\u5c06\u4e0d\u5e38\u7528\u7684\u89c4\u5219\u653e\u5230\u6700\u540e\u3002<\/p>\n<p>\u7ed3\u8bba<\/p>\n<p>Linux\u9632\u706b\u5899\u66f4\u4f73\u5b9e\u8df5\u53ef\u4ee5\u5e2e\u52a9\u7528\u6237\u66f4\u597d\u5730\u914d\u7f6eLinux\u9632\u706b\u5899\u5e76\u63d0\u9ad8\u7cfb\u7edf\u7684\u5b89\u5168\u6027\u3002\u5728Linux\u9632\u706b\u5899\u90e8\u7f72\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5e94\u8be5\u9075\u5b88\u4e00\u5b9a\u7684\u89c4\u5219\u548c\u539f\u5219\uff0c\u4f8b\u5982\u5173\u95ed\u4e0d\u5fc5\u8981\u7684\u7aef\u53e3\u3001\u914d\u7f6e\u767d\u540d\u5355\u7b49\u3002\u540c\u65f6\uff0c\u7528\u6237\u5e94\u8be5\u5b66\u4f1a\u4f7f\u7528iptables\u89c4\u5219\u6765\u63d0\u9ad8\u9632\u706b\u5899\u7684\u6027\u80fd\u548c\u5b89\u5168\u6027\u3002\u6700\u91cd\u8981\u7684\u662f\uff0c\u7528\u6237\u5e94\u8be5\u4fdd\u6301\u9632\u706b\u5899\u89c4\u5219\u7684\u66f4\u65b0\u548c\u7ba1\u7406\uff0c\u4ee5\u53ca\u5b9a\u671f\u68c0\u67e5\u548c\u5347\u7ea7\u7cfb\u7edf\u8f6f\u4ef6\uff0c\u4ece\u800c\u63d0\u9ad8\u7cfb\u7edf\u7684\u5b89\u5168\u6027\u548c\u7a33\u5b9a\u6027\u3002<\/p>\n<p><strong>\u76f8\u5173\u95ee\u9898\u62d3\u5c55\u9605\u8bfb\uff1a<\/strong><\/p>\n<ul>\n<li>\u4e00\u53f0\u65b0linux\u9632\u706b\u5899\u914d\u7f6e\u95ee\u9898<\/li>\n<\/ul>\n<h3>\u4e00\u53f0\u65b0linux\u9632\u706b\u5899\u914d\u7f6e\u95ee\u9898<\/h3>\n<p>1.\u5c06linux\u4e3b\u673a\u53d8\u6210\u8def\u7531\u5668<\/p>\n<p>#echo \u201c1\u201d &gt; \/proc\/sys\/net\/ipv4\/ip_forward<\/p>\n<p>2.\u542f\u52a8\u9632\u706b\u5899\u5b9e\u73b0NAT<\/p>\n<p> (\u5982\u679c\u662fADSL\u4e0a\u7f51)<\/p>\n<p>#iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE<\/p>\n<p>\uff08\u5982\u679c\u53ea\u80fd\u5728eth1\u7684\u7535\u8111\u4e0a\uff0c\u800c\u4e0d\u6bc1\u886b\u518c\u8bb8\u4ee5\u540e\u7684eth2\u3001eth3\u4e0a\u7f51\uff0c\u7528\u4e0b\u9762\u8bed\u53e5\uff09<\/p>\n<p>#iptables -t nat -A POSTROUTING -i eth1 -o ppp0 -j MASQUERADE <\/p>\n<p>\uff08\u5982\u679c\u662f\u9759\u6001IP\u4e0a\u7f51\uff09<\/p>\n<p>#iptables -t nat -A POSTROUTING -i eth1 -o eth0 -j SNAT \u2013to-source \u5916\u7f51IP <\/p>\n<p>3.\u5ba2\u6237\u673a\u5c06\u81ea\u5df1\u4e0a\u7ea4\u5b8f\u7f51\u7f51\u5173\u584c\u9877\u8bbe\u4e3alinux\u7684eth1\u7684IP<\/p>\n<p>1)\u5982\u679c\u53ea\u662f\u7b80\u5355\u7684\u8154\u8ba9\u5b9e\u73b0\u4e0a\u7f51\u529f\u80fd,\u5f88\u5bb9\u6613\u5b9e\u73b0, \u5148\u914d\u7f6e\u4f60\u7684\u7f51\u5361IP,eth0\u4e3a\u4f60\u5916\u7f51IP(\u6bd4\u5982:60.0.0.1),eth1\u5185\u7f51\u5730\u5740(\u6bd4\u5982:192.168.1.1)<\/p>\n<p>2) echo 1 &gt; \/proc\/sys\/net\/\u6570\u9996ipv4\/ip_forward<\/p>\n<p>{#vi \/etc\/sysctl.conf <\/p>\n<p>net.ipv4.ip_forward = 1}<\/p>\n<p>3)\u3001\u6253\u5f00iptables\u7684NAT\u529f\u80fd:<\/p>\n<p>\/in\/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE<\/p>\n<p>\u8bf4\u660e\uff1a\u4e0a\u9762\u7684\u8bed\u53e5\u4e2deth0\u662f\u8fde\u63a5\u5916\u7f51\u6216\u8005\u8fde\u63a5\u4f0d\u6bd5\u5c40Internet\u7684\u7f51\u5361. \u6267\u884c\u4e0b\u9762\u7684\u547d\u4ee4\uff0c\u4fdd\u5b58iptables\u7684\u89c4\u5219: service iptables save<\/p>\n<p>4)\u3001\u67e5\u770b\u8def\u7531\u8868:<\/p>\n<p>netstat -rn \u6216 route -n<\/p>\n<p>5)\u3001\u67e5\u770biptables\u89c4\u5219:<\/p>\n<p>iptables -L<\/p>\n<p>\u5173\u6ce8\u4e2d<\/p>\n<p>\u5173\u4e8elinux\u9632\u706b\u5899\u90e8\u7f72\u89c4\u5219\u8be6\u60c5\u7684\u4ecb\u7ecd\u5230\u6b64\u5c31\u7ed3\u675f\u4e86\uff0c\u4e0d\u77e5\u9053\u4f60\u4ece\u4e2d\u627e\u5230\u4f60\u9700\u8981\u7684\u4fe1\u606f\u4e86\u5417 \uff1f\u5982\u679c\u4f60\u8fd8\u60f3\u4e86\u89e3\u66f4\u591a\u8fd9\u65b9\u9762\u7684\u4fe1\u606f\uff0c\u8bb0\u5f97\u6536\u85cf\u5173\u6ce8\u672c\u7ad9\u3002<\/p>\n<p><a href=\"http:https:\/\/idc.net\/\">\u9999\u6e2f\u670d\u52a1\u5668<\/a>\u9996\u9009\u540e\u6d6a\u4e91\uff0c2H2G\u9996\u670810\u5143\u5f00\u901a\u3002<br \/>\u540e\u6d6a\u4e91\uff08www.IDC.Net\uff09\u63d0\u4f9b\u7b80\u5355\u597d\u7528\uff0c\u4ef7\u683c\u539a\u9053\u7684\u9999\u6e2f\/\u7f8e\u56fd\u4e91\u670d\u52a1\u5668\u548c\u72ec\u7acb\u670d\u52a1\u5668\u3002IDC+ISP+ICP\u8d44\u8d28\u3002ARIN\u548cAPNIC\u4f1a\u5458\u3002\u6210\u719f\u6280\u672f\u56e2\u961f15\u5e74\u884c\u4e1a\u7ecf\u9a8c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Linux\u9632\u706b\u5899\u662f\u4e00\u9879\u5fc5\u4e0d\u53ef\u5c11\u7684\u5b89\u5168\u4fdd\u969c\uff0c\u5b83\u53ef\u4ee5\u9632\u6b62\u672a\u6388\u6743\u4eba\u5458\u5bf9\u64cd\u4f5c\u7cfb\u7edf\u8fdb\u884c\u653b\u51fb\u548c\u5165\u4fb5\u3002\u4f46\u662f\uff0c\u9632\u706b\u5899\u89c4\u5219\u7684\u90e8\u7f72 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34],"tags":[],"class_list":["post-125988","post","type-post","status-publish","format-standard","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/125988","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=125988"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/125988\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=125988"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=125988"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=125988"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}