{"id":650,"date":"2018-12-15T00:19:47","date_gmt":"2018-12-14T16:19:47","guid":{"rendered":"http:\/\/zkeeer.space\/?p=650"},"modified":"2018-12-15T00:22:13","modified_gmt":"2018-12-14T16:22:13","slug":"650","status":"publish","type":"post","link":"http:\/\/zkeeer.space\/?p=650","title":{"rendered":"iptables\u8be6\u89e3"},"content":{"rendered":"

\u6587\u7ae0\u8f6c\u81ea\u6731\u53cc\u5370\u7684\u535a\u5ba2<\/a>\u2014\u2014iptables\u8be6\u89e3\uff081\uff09\uff1aiptables\u6982\u5ff5<\/a><\/p>\n

\u6731\u53cc\u5370\u7684iptables\u7cfb\u5217\u6587\u7ae0<\/a>\u4e00\u517114\u7bc7\uff0c\u5c06iptables\u89e3\u91ca\u5f97\u4e00\u6e05\u4e8c\u695a\u3002\u4ed6\u7684\u5176\u4ed6\u6587\u7ae0\u90fd\u5f88\u4e0d\u9519\uff0c\u5f88\u63a8\u8350\u3002<\/p><\/blockquote>\n

\u8fd9\u7bc7\u6587\u7ae0\u4f1a\u5c3d\u91cf\u4ee5\u901a\u4fd7\u6613\u61c2\u7684\u65b9\u5f0f\u63cf\u8ff0iptables<\/a>\u7684\u76f8\u5173\u6982\u5ff5\uff0c\u8bf7\u8010\u5fc3\u7684\u8bfb\u5b8c\u5b83\u3002<\/p>\n

\u9632\u706b\u5899\u76f8\u5173\u6982\u5ff5<\/strong><\/h3>\n
\n

\u6b64\u5904\u5148\u63cf\u8ff0\u4e00\u4e9b\u76f8\u5173\u6982\u5ff5\u3002<\/p>\n

\u4ece\u903b\u8f91\u4e0a\u8bb2\u3002\u9632\u706b\u5899\u53ef\u4ee5\u5927\u4f53\u5206\u4e3a\u4e3b\u673a\u9632\u706b\u5899\u548c\u7f51\u7edc\u9632\u706b\u5899\u3002<\/p>\n

\u4e3b\u673a\u9632\u706b\u5899\uff1a\u9488\u5bf9\u4e8e\u5355\u4e2a\u4e3b\u673a\u8fdb\u884c\u9632\u62a4\u3002<\/p>\n

\u7f51\u7edc\u9632\u706b\u5899\uff1a\u5f80\u5f80\u5904\u4e8e\u7f51\u7edc\u5165\u53e3\u6216\u8fb9\u7f18\uff0c\u9488\u5bf9\u4e8e\u7f51\u7edc\u5165\u53e3\u8fdb\u884c\u9632\u62a4\uff0c\u670d\u52a1\u4e8e\u9632\u706b\u5899\u80cc\u540e\u7684\u672c\u5730\u5c40\u57df\u7f51\u3002<\/p>\n

\u7f51\u7edc\u9632\u706b\u5899\u548c\u4e3b\u673a\u9632\u706b\u5899\u5e76\u4e0d\u51b2\u7a81\uff0c\u53ef\u4ee5\u7406\u89e3\u4e3a\uff0c\u7f51\u7edc\u9632\u706b\u5899\u4e3b\u5916\uff08\u96c6\u4f53\uff09\uff0c \u4e3b\u673a\u9632\u706b\u5899\u4e3b\u5185\uff08\u4e2a\u4eba\uff09\u3002<\/p>\n

\u4ece\u7269\u7406\u4e0a\u8bb2\uff0c\u9632\u706b\u5899\u53ef\u4ee5\u5206\u4e3a\u786c\u4ef6\u9632\u706b\u5899\u548c\u8f6f\u4ef6\u9632\u706b\u5899\u3002<\/p>\n

\u786c\u4ef6\u9632\u706b\u5899\uff1a\u5728\u786c\u4ef6\u7ea7\u522b\u5b9e\u73b0\u90e8\u5206\u9632\u706b\u5899\u529f\u80fd\uff0c\u53e6\u4e00\u90e8\u5206\u529f\u80fd\u57fa\u4e8e\u8f6f\u4ef6\u5b9e\u73b0\uff0c\u6027\u80fd\u9ad8\uff0c\u6210\u672c\u9ad8\u3002<\/p>\n

\u8f6f\u4ef6\u9632\u706b\u5899\uff1a\u5e94\u7528\u8f6f\u4ef6\u5904\u7406\u903b\u8f91\u8fd0\u884c\u4e8e\u901a\u7528\u786c\u4ef6\u5e73\u53f0\u4e4b\u4e0a\u7684\u9632\u706b\u5899\uff0c\u6027\u80fd\u4f4e\uff0c\u6210\u672c\u4f4e\u3002<\/p>\n

\"\"<\/p>\n

\u90a3\u4e48\u5728\u6b64\u5904\uff0c\u6211\u4eec\u5c31\u6765\u804a\u804aLinux\u7684iptables<\/p>\n

iptables<\/strong>\u5176\u5b9e\u4e0d\u662f\u771f\u6b63\u7684\u9632\u706b\u5899\uff0c\u6211\u4eec\u53ef\u4ee5\u628a\u5b83\u7406\u89e3\u6210\u4e00\u4e2a\u5ba2\u6237\u7aef\u4ee3\u7406\uff0c\u7528\u6237\u901a\u8fc7iptables\u8fd9\u4e2a\u4ee3\u7406\uff0c\u5c06\u7528\u6237\u7684\u5b89\u5168\u8bbe\u5b9a\u6267\u884c\u5230\u5bf9\u5e94\u7684”\u5b89\u5168\u6846\u67b6”\u4e2d\uff0c\u8fd9\u4e2a”\u5b89\u5168\u6846\u67b6”\u624d\u662f\u771f\u6b63\u7684\u9632\u706b\u5899\uff0c\u8fd9\u4e2a\u6846\u67b6\u7684\u540d\u5b57\u53ebnetfilter<\/strong><\/p>\n

netfilter\u624d\u662f\u9632\u706b\u5899\u771f\u6b63\u7684\u5b89\u5168\u6846\u67b6\uff08framework\uff09\uff0cnetfilter\u4f4d\u4e8e\u5185\u6838\u7a7a\u95f4\u3002<\/p>\n

iptables\u5176\u5b9e\u662f\u4e00\u4e2a\u547d\u4ee4\u884c\u5de5\u5177\uff0c\u4f4d\u4e8e\u7528\u6237\u7a7a\u95f4\uff0c\u6211\u4eec\u7528\u8fd9\u4e2a\u5de5\u5177\u64cd\u4f5c\u771f\u6b63\u7684\u6846\u67b6\u3002<\/p>\n

netfilter\/iptables\uff08\u4e0b\u6587\u4e2d\u7b80\u79f0\u4e3aiptables\uff09\u7ec4\u6210Linux\u5e73\u53f0\u4e0b\u7684\u5305\u8fc7\u6ee4\u9632\u706b\u5899\uff0c\u4e0e\u5927\u591a\u6570\u7684Linux\u8f6f\u4ef6\u4e00\u6837\uff0c\u8fd9\u4e2a\u5305\u8fc7\u6ee4\u9632\u706b\u5899\u662f\u514d\u8d39\u7684\uff0c\u5b83\u53ef\u4ee5\u4ee3\u66ff\u6602\u8d35\u7684\u5546\u4e1a\u9632\u706b\u5899\u89e3\u51b3\u65b9\u6848\uff0c\u5b8c\u6210\u5c01\u5305\u8fc7\u6ee4\u3001\u5c01\u5305\u91cd\u5b9a\u5411\u548c\u7f51\u7edc\u5730\u5740\u8f6c\u6362\uff08NAT\uff09\u7b49\u529f\u80fd\u3002<\/p>\n

Netfilter\u662fLinux\u64cd\u4f5c\u7cfb\u7edf\u6838\u5fc3\u5c42\u5185\u90e8\u7684\u4e00\u4e2a\u6570\u636e\u5305\u5904\u7406\u6a21\u5757\uff0c\u5b83\u5177\u6709\u5982\u4e0b\u529f\u80fd\uff1a<\/p>\n

\u7f51\u7edc\u5730\u5740\u8f6c\u6362(Network Address Translate)\u3001\u6570\u636e\u5305\u5185\u5bb9\u4fee\u6539\u3001\u53ca\u6570\u636e\u5305\u8fc7\u6ee4\u7684\u9632\u706b\u5899\u529f\u80fd<\/em><\/p>\n

\u6240\u4ee5\u8bf4\uff0c\u867d\u7136\u6211\u4eec\u4f7f\u7528service iptables start\u542f\u52a8iptables”\u670d\u52a1”\uff0c\u4f46\u662f\u5176\u5b9e\u51c6\u786e\u7684\u6765\u8bf4\uff0ciptables\u5e76\u6ca1\u6709\u4e00\u4e2a\u5b88\u62a4\u8fdb\u7a0b\uff0c\u6240\u4ee5\u5e76\u4e0d\u80fd\u7b97\u662f\u771f\u6b63\u610f\u4e49\u4e0a\u7684\u670d\u52a1\uff0c\u800c\u5e94\u8be5\u7b97\u662f\u5185\u6838\u63d0\u4f9b\u7684\u529f\u80fd\u3002<\/p>\n

iptables<\/strong>\u57fa\u7840<\/strong><\/h3>\n
\n

\u6211\u4eec\u77e5\u9053iptables\u662f\u6309\u7167\u89c4\u5219\u6765\u529e\u4e8b\u7684\uff0c\u6211\u4eec\u5c31\u6765\u8bf4\u8bf4\u89c4\u5219\uff08rules\uff09\uff0c\u89c4\u5219\u5176\u5b9e\u5c31\u662f\u7f51\u7edc\u7ba1\u7406\u5458\u9884\u5b9a\u4e49\u7684\u6761\u4ef6\uff0c\u89c4\u5219\u4e00\u822c\u7684\u5b9a\u4e49\u4e3a”\u5982\u679c\u6570\u636e\u5305\u5934\u7b26\u5408\u8fd9\u6837\u7684\u6761\u4ef6\uff0c\u5c31\u8fd9\u6837\u5904\u7406\u8fd9\u4e2a\u6570\u636e\u5305”\u3002\u89c4\u5219\u5b58\u50a8\u5728\u5185\u6838\u7a7a\u95f4\u7684\u4fe1\u606f\u5305\u8fc7\u6ee4\u8868\u4e2d\uff0c\u8fd9\u4e9b\u89c4\u5219\u5206\u522b\u6307\u5b9a\u4e86\u6e90\u5730\u5740\u3001\u76ee\u7684\u5730\u5740\u3001\u4f20\u8f93\u534f\u8bae\uff08\u5982TCP\u3001UDP\u3001ICMP\uff09\u548c\u670d\u52a1\u7c7b\u578b\uff08\u5982HTTP\u3001FTP\u548cSMTP\uff09\u7b49\u3002\u5f53\u6570\u636e\u5305\u4e0e\u89c4\u5219\u5339\u914d\u65f6\uff0ciptables\u5c31\u6839\u636e\u89c4\u5219\u6240\u5b9a\u4e49\u7684\u65b9\u6cd5\u6765\u5904\u7406\u8fd9\u4e9b\u6570\u636e\u5305\uff0c\u5982\u653e\u884c\uff08accept\uff09\u3001\u62d2\u7edd\uff08reject\uff09\u548c\u4e22\u5f03\uff08drop\uff09\u7b49\u3002\u914d\u7f6e\u9632\u706b\u5899\u7684\u4e3b\u8981\u5de5\u4f5c\u5c31\u662f\u6dfb\u52a0\u3001\u4fee\u6539\u548c\u5220\u9664\u8fd9\u4e9b\u89c4\u5219\u3002<\/p>\n

\u8fd9\u6837\u8bf4\u53ef\u80fd\u5e76\u4e0d\u5bb9\u6613\u7406\u89e3\uff0c\u6211\u4eec\u6765\u6362\u4e2a\u5bb9\u6613\u7406\u89e3\u7684\u89d2\u5ea6\uff0c\u4ece\u5934\u8bf4\u8d77.<\/p>\n

\u5f53\u5ba2\u6237\u7aef\u8bbf\u95ee\u670d\u52a1\u5668\u7684web\u670d\u52a1\u65f6\uff0c\u5ba2\u6237\u7aef\u53d1\u9001\u62a5\u6587\u5230\u7f51\u5361\uff0c\u800ctcp\/ip\u534f\u8bae\u6808\u662f\u5c5e\u4e8e\u5185\u6838\u7684\u4e00\u90e8\u5206\uff0c\u6240\u4ee5\uff0c\u5ba2\u6237\u7aef\u7684\u4fe1\u606f\u4f1a\u901a\u8fc7\u5185\u6838\u7684TCP\u534f\u8bae\u4f20\u8f93\u5230\u7528\u6237\u7a7a\u95f4\u4e2d\u7684web\u670d\u52a1\u4e2d\uff0c\u800c\u6b64\u65f6\uff0c\u5ba2\u6237\u7aef\u62a5\u6587\u7684\u76ee\u6807\u7ec8\u70b9\u4e3aweb\u670d\u52a1\u6240\u76d1\u542c\u7684\u5957\u63a5\u5b57\uff08IP\uff1aPort\uff09\u4e0a\uff0c\u5f53web\u670d\u52a1\u9700\u8981\u54cd\u5e94\u5ba2\u6237\u7aef\u8bf7\u6c42\u65f6\uff0cweb\u670d\u52a1\u53d1\u51fa\u7684\u54cd\u5e94\u62a5\u6587\u7684\u76ee\u6807\u7ec8\u70b9\u5219\u4e3a\u5ba2\u6237\u7aef\uff0c\u8fd9\u4e2a\u65f6\u5019\uff0cweb\u670d\u52a1\u6240\u76d1\u542c\u7684IP\u4e0e\u7aef\u53e3\u53cd\u800c\u53d8\u6210\u4e86\u539f\u70b9\uff0c\u6211\u4eec\u8bf4\u8fc7\uff0cnetfilter\u624d\u662f\u771f\u6b63\u7684\u9632\u706b\u5899\uff0c\u5b83\u662f\u5185\u6838\u7684\u4e00\u90e8\u5206\uff0c\u6240\u4ee5\uff0c\u5982\u679c\u6211\u4eec\u60f3\u8981\u9632\u706b\u5899\u80fd\u591f\u8fbe\u5230”\u9632\u706b”\u7684\u76ee\u7684\uff0c\u5219\u9700\u8981\u5728\u5185\u6838\u4e2d\u8bbe\u7f6e\u5173\u5361\uff0c\u6240\u6709\u8fdb\u51fa\u7684\u62a5\u6587\u90fd\u8981\u901a\u8fc7\u8fd9\u4e9b\u5173\u5361\uff0c\u7ecf\u8fc7\u68c0\u67e5\u540e\uff0c\u7b26\u5408\u653e\u884c\u6761\u4ef6\u7684\u624d\u80fd\u653e\u884c\uff0c\u7b26\u5408\u963b\u62e6\u6761\u4ef6\u7684\u5219\u9700\u8981\u88ab\u963b\u6b62\uff0c\u4e8e\u662f\uff0c\u5c31\u51fa\u73b0\u4e86input\u5173\u5361\u548coutput\u5173\u5361\uff0c\u800c\u8fd9\u4e9b\u5173\u5361\u5728iptables\u4e2d\u4e0d\u88ab\u79f0\u4e3a”\u5173\u5361”,\u800c\u88ab\u79f0\u4e3a”\u94fe”\u3002<\/p>\n

\"\"<\/p>\n

\u5176\u5b9e\u6211\u4eec\u4e0a\u9762\u63cf\u8ff0\u7684\u573a\u666f\u5e76\u4e0d\u5b8c\u5584\uff0c\u56e0\u4e3a\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u62a5\u6587\u8bbf\u95ee\u7684\u76ee\u6807\u5730\u5740\u53ef\u80fd\u5e76\u4e0d\u662f\u672c\u673a\uff0c\u800c\u662f\u5176\u4ed6\u670d\u52a1\u5668\uff0c\u5f53\u672c\u673a\u7684\u5185\u6838\u652f\u6301IP_FORWARD\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u62a5\u6587\u8f6c\u53d1\u7ed9\u5176\u4ed6\u670d\u52a1\u5668\uff0c\u6240\u4ee5\uff0c\u8fd9\u4e2a\u65f6\u5019\uff0c\u6211\u4eec\u5c31\u4f1a\u63d0\u5230iptables\u4e2d\u7684\u5176\u4ed6”\u5173\u5361”\uff0c\u4e5f\u5c31\u662f\u5176\u4ed6”\u94fe”\uff0c\u4ed6\u4eec\u5c31\u662f \u00a0“\u8def\u7531\u524d”\u3001”\u8f6c\u53d1”\u3001”\u8def\u7531\u540e”\uff0c\u4ed6\u4eec\u7684\u82f1\u6587\u540d\u662f<\/p>\n

PREROUTING\u3001FORWARD\u3001POSTROUTING<\/p>\n

\u4e5f\u5c31\u662f\u8bf4\uff0c\u5f53\u6211\u4eec\u542f\u7528\u4e86\u9632\u706b\u5899\u529f\u80fd\u65f6\uff0c\u62a5\u6587\u9700\u8981\u7ecf\u8fc7\u5982\u4e0b\u5173\u5361\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u7684\u4e0d\u540c\uff0c\u62a5\u6587\u7ecf\u8fc7”\u94fe”\u53ef\u80fd\u4e0d\u540c\u3002\u5982\u679c\u62a5\u6587\u9700\u8981\u8f6c\u53d1\uff0c\u90a3\u4e48\u62a5\u6587\u5219\u4e0d\u4f1a\u7ecf\u8fc7input\u94fe\u53d1\u5f80\u7528\u6237\u7a7a\u95f4\uff0c\u800c\u662f\u76f4\u63a5\u5728\u5185\u6838\u7a7a\u95f4\u4e2d\u7ecf\u8fc7forward\u94fe\u548cpostrouting\u94fe\u8f6c\u53d1\u51fa\u53bb\u7684\u3002<\/p>\n

\"\"<\/p>\n

\u6240\u4ee5\uff0c\u6839\u636e\u4e0a\u56fe\uff0c\u6211\u4eec\u80fd\u591f\u60f3\u8c61\u51fa\u67d0\u4e9b\u5e38\u7528\u573a\u666f\u4e2d\uff0c\u62a5\u6587\u7684\u6d41\u5411\uff1a<\/p>\n

\u5230\u672c\u673a\u67d0\u8fdb\u7a0b\u7684\u62a5\u6587\uff1aPREROUTING –> INPUT<\/p>\n

\u7531\u672c\u673a\u8f6c\u53d1\u7684\u62a5\u6587\uff1aPREROUTING –> FORWARD –> POSTROUTING<\/p>\n

\u7531\u672c\u673a\u7684\u67d0\u8fdb\u7a0b\u53d1\u51fa\u62a5\u6587\uff08\u901a\u5e38\u4e3a\u54cd\u5e94\u62a5\u6587\uff09\uff1aOUTPUT –> POSTROUTING<\/p>\n

\u94fe\u7684\u6982\u5ff5<\/strong><\/h3>\n
\n

\u73b0\u5728\uff0c\u6211\u4eec\u60f3\u8c61\u4e00\u4e0b\uff0c\u8fd9\u4e9b”\u5173\u5361”\u5728iptables\u4e2d\u4e3a\u4ec0\u4e48\u88ab\u79f0\u4f5c”\u94fe”\u5462\uff1f\u6211\u4eec\u77e5\u9053\uff0c\u9632\u706b\u5899\u7684\u4f5c\u7528\u5c31\u5728\u4e8e\u5bf9\u7ecf\u8fc7\u7684\u62a5\u6587\u5339\u914d”\u89c4\u5219”\uff0c\u7136\u540e\u6267\u884c\u5bf9\u5e94\u7684”\u52a8\u4f5c”,\u6240\u4ee5\uff0c\u5f53\u62a5\u6587\u7ecf\u8fc7\u8fd9\u4e9b\u5173\u5361\u7684\u65f6\u5019\uff0c\u5219\u5fc5\u987b\u5339\u914d\u8fd9\u4e2a\u5173\u5361\u4e0a\u7684\u89c4\u5219\uff0c\u4f46\u662f\uff0c\u8fd9\u4e2a\u5173\u5361\u4e0a\u53ef\u80fd\u4e0d\u6b62\u6709\u4e00\u6761\u89c4\u5219\uff0c\u800c\u662f\u6709\u5f88\u591a\u6761\u89c4\u5219\uff0c\u5f53\u6211\u4eec\u628a\u8fd9\u4e9b\u89c4\u5219\u4e32\u5230\u4e00\u4e2a\u94fe\u6761\u4e0a\u7684\u65f6\u5019\uff0c\u5c31\u5f62\u6210\u4e86”\u94fe”,\u6240\u4ee5\uff0c\u6211\u4eec\u628a\u6bcf\u4e00\u4e2a”\u5173\u5361”\u60f3\u8c61\u6210\u5982\u4e0b\u56fe\u4e2d\u7684\u6a21\u6837 \u00a0\uff0c\u8fd9\u6837\u6765\u8bf4\uff0c\u628a\u4ed6\u4eec\u79f0\u4e3a”\u94fe”\u66f4\u4e3a\u5408\u9002\uff0c\u6bcf\u4e2a\u7ecf\u8fc7\u8fd9\u4e2a”\u5173\u5361”\u7684\u62a5\u6587\uff0c\u90fd\u8981\u5c06\u8fd9\u6761”\u94fe”\u4e0a\u7684\u6240\u6709\u89c4\u5219\u5339\u914d\u4e00\u904d\uff0c\u5982\u679c\u6709\u7b26\u5408\u6761\u4ef6\u7684\u89c4\u5219\uff0c\u5219\u6267\u884c\u89c4\u5219\u5bf9\u5e94\u7684\u52a8\u4f5c\u3002<\/p>\n

\"\"<\/p>\n

 <\/p>\n

\u8868\u7684\u6982\u5ff5<\/strong><\/h3>\n
\n

\u6211\u4eec\u518d\u60f3\u60f3\u53e6\u5916\u4e00\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u5bf9\u6bcf\u4e2a”\u94fe”\u4e0a\u90fd\u653e\u7f6e\u4e86\u4e00\u4e32\u89c4\u5219\uff0c\u4f46\u662f\u8fd9\u4e9b\u89c4\u5219\u6709\u4e9b\u5f88\u76f8\u4f3c\uff0c\u6bd4\u5982\uff0cA\u7c7b\u89c4\u5219\u90fd\u662f\u5bf9IP\u6216\u8005\u7aef\u53e3\u7684\u8fc7\u6ee4\uff0cB\u7c7b\u89c4\u5219\u662f\u4fee\u6539\u62a5\u6587\uff0c\u90a3\u4e48\u8fd9\u4e2a\u65f6\u5019\uff0c\u6211\u4eec\u662f\u4e0d\u662f\u80fd\u628a\u5b9e\u73b0\u76f8\u540c\u529f\u80fd\u7684\u89c4\u5219\u653e\u5728\u4e00\u8d77\u5462\uff0c\u5fc5\u987b\u80fd\u7684\u3002<\/p>\n

\u6211\u4eec\u628a\u5177\u6709\u76f8\u540c\u529f\u80fd\u7684\u89c4\u5219\u7684\u96c6\u5408\u53eb\u505a”\u8868”\uff0c\u6240\u4ee5\u8bf4\uff0c\u4e0d\u540c\u529f\u80fd\u7684\u89c4\u5219\uff0c\u6211\u4eec\u53ef\u4ee5\u653e\u7f6e\u5728\u4e0d\u540c\u7684\u8868\u4e2d\u8fdb\u884c\u7ba1\u7406\uff0c\u800ciptables\u5df2\u7ecf\u4e3a\u6211\u4eec\u5b9a\u4e49\u4e864\u79cd\u8868\uff0c\u6bcf\u79cd\u8868\u5bf9\u5e94\u4e86\u4e0d\u540c\u7684\u529f\u80fd\uff0c\u800c\u6211\u4eec\u5b9a\u4e49\u7684\u89c4\u5219\u4e5f\u90fd\u9003\u8131\u4e0d\u4e86\u8fd94\u79cd\u529f\u80fd\u7684\u8303\u56f4\uff0c\u6240\u4ee5\uff0c\u5b66\u4e60iptables\u4e4b\u524d\uff0c\u6211\u4eec\u5fc5\u987b\u5148\u641e\u660e\u767d\u6bcf\u79cd\u8868 \u7684\u4f5c\u7528\u3002<\/p>\n

iptables\u4e3a\u6211\u4eec\u63d0\u4f9b\u4e86\u5982\u4e0b\u89c4\u5219\u7684\u5206\u7c7b\uff0c\u6216\u8005\u8bf4\uff0ciptables\u4e3a\u6211\u4eec\u63d0\u4f9b\u4e86\u5982\u4e0b”\u8868”<\/p>\n

filter\u8868\uff1a\u8d1f\u8d23\u8fc7\u6ee4\u529f\u80fd\uff0c\u9632\u706b\u5899\uff1b\u5185\u6838\u6a21\u5757\uff1aiptables_filter\r\n\r\nnat\u8868\uff1anetwork address translation\uff0c\u7f51\u7edc\u5730\u5740\u8f6c\u6362\u529f\u80fd\uff1b\u5185\u6838\u6a21\u5757\uff1aiptable_nat\r\n\r\nmangle\u8868\uff1a\u62c6\u89e3\u62a5\u6587\uff0c\u505a\u51fa\u4fee\u6539\uff0c\u5e76\u91cd\u65b0\u5c01\u88c5 \u7684\u529f\u80fd\uff1biptable_mangle\r\n\r\nraw\u8868\uff1a\u5173\u95ednat\u8868\u4e0a\u542f\u7528\u7684\u8fde\u63a5\u8ffd\u8e2a\u673a\u5236\uff1biptable_raw<\/pre>\n
\u4e5f\u5c31\u662f\u8bf4\uff0c\u6211\u4eec\u81ea\u5b9a\u4e49\u7684\u6240\u6709\u89c4\u5219\uff0c\u90fd\u662f\u8fd9\u56db\u79cd\u5206\u7c7b\u4e2d\u7684\u89c4\u5219\uff0c\u6216\u8005\u8bf4\uff0c\u6240\u6709\u89c4\u5219\u90fd\u5b58\u5728\u4e8e\u8fd94\u5f20”\u8868”\u4e2d\u3002<\/p>\n
\u8868\u94fe\u5173\u7cfb<\/strong><\/h3>\n
\n
\u4f46\u662f\u6211\u4eec\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u67d0\u4e9b”\u94fe”\u4e2d\u6ce8\u5b9a\u4e0d\u4f1a\u5305\u542b”\u67d0\u7c7b\u89c4\u5219”\uff0c\u5c31\u50cf\u67d0\u4e9b”\u5173\u5361”\u5929\u751f\u5c31\u4e0d\u5177\u5907\u67d0\u4e9b\u529f\u80fd\u4e00\u6837\uff0c\u6bd4\u5982\uff0cA”\u5173\u5361”\u53ea\u8d1f\u8d23\u6253\u51fb\u9646\u5730\u654c\u4eba\uff0c\u6ca1\u6709\u9632\u7a7a\u80fd\u529b\uff0cB”\u5173\u5361”\u53ea\u8d1f\u8d23\u6253\u51fb\u7a7a\u4e2d\u654c\u4eba\uff0c\u6ca1\u6709\u9632\u5fa1\u6b65\u5175\u7684\u80fd\u529b\uff0cC”\u5173\u5361”\u53ef\u80fd\u6bd4\u8f83NB\uff0c\u65e2\u80fd\u9632\u7a7a\uff0c\u4e5f\u80fd\u9632\u5fa1\u9646\u5730\u654c\u4eba\uff0cD”\u5173\u5361”\u6700\u5c4c\uff0c\u6d77\u9646\u7a7a\u90fd\u80fd\u9632\u3002<\/p>\n
\u90a3\u8ba9\u6211\u4eec\u6765\u770b\u770b\uff0c\u6bcf\u4e2a”\u5173\u5361”\u90fd\u6709\u54ea\u4e9b\u80fd\u529b\uff0c\u6216\u8005\u8bf4\uff0c\u8ba9\u6211\u4eec\u770b\u770b\u6bcf\u4e2a”\u94fe”\u4e0a\u7684\u89c4\u5219\u90fd\u5b58\u5728\u4e8e\u54ea\u4e9b”\u8868”\u4e2d\u3002<\/p>\n
\u6211\u4eec\u8fd8\u662f\u4ee5\u56fe\u4e3a\u4f8b\uff0c\u5148\u770b\u770bprerouting”\u94fe”\u4e0a\u7684\u89c4\u5219\u90fd\u5b58\u5728\u4e8e\u54ea\u4e9b\u8868\u4e2d\u3002<\/p>\n
\u6ce8\u610f\uff1a\u4e0b\u56fe\u53ea\u7528\u4e8e\u8bf4\u660eprerouting\u94fe\u4e0a\u7684\u89c4\u5219\u5b58\u5728\u4e8e\u54ea\u4e9b\u8868\u4e2d\uff0c\u5e76\u6ca1\u6709\u63cf\u8ff0\u8868\u7684\u987a\u5e8f\u3002<\/p>\n
\"\"<\/p>\n
\u8fd9\u5e45\u56fe\u662f\u4ec0\u4e48\u610f\u601d\u5462\uff1f\u5b83\u7684\u610f\u601d\u662f\u8bf4\uff0cprerouting”\u94fe”\u53ea\u62e5\u6709nat\u8868\u3001raw\u8868\u548cmangle\u8868\u6240\u5bf9\u5e94\u7684\u529f\u80fd\uff0c\u6240\u4ee5\uff0cprerouting\u4e2d\u7684\u89c4\u5219\u53ea\u80fd\u5b58\u653e\u4e8enat\u8868\u3001raw\u8868\u548cmangle\u8868\u4e2d\u3002<\/p>\n
\u90a3\u4e48\uff0c\u6839\u636e\u4e0a\u8ff0\u601d\u8def\uff0c\u6211\u4eec\u6765\u603b\u7ed3\u4e00\u4e0b\uff0c\u6bcf\u4e2a”\u5173\u5361”\u90fd\u62e5\u6709\u4ec0\u4e48\u529f\u80fd\uff0c<\/p>\n
\u6216\u8005\u8bf4\uff0c\u6bcf\u4e2a”\u94fe”\u4e2d\u7684\u89c4\u5219\u90fd\u5b58\u5728\u4e8e\u54ea\u4e9b”\u8868”\u4e2d\u3002<\/p>\n
PREROUTING \u00a0 \u00a0 \u00a0\u7684\u89c4\u5219\u53ef\u4ee5\u5b58\u5728\u4e8e\uff1araw\u8868\uff0cmangle\u8868\uff0cnat\u8868\u3002\r\n\r\nINPUT \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u7684\u89c4\u5219\u53ef\u4ee5\u5b58\u5728\u4e8e\uff1amangle\u8868\uff0cfilter\u8868\uff0c\uff08centos7\u4e2d\u8fd8\u6709nat\u8868\uff0ccentos6\u4e2d\u6ca1\u6709\uff09\u3002\r\n\r\nFORWARD \u00a0 \u00a0 \u00a0 \u00a0 \u7684\u89c4\u5219\u53ef\u4ee5\u5b58\u5728\u4e8e\uff1amangle\u8868\uff0cfilter\u8868\u3002\r\n\r\nOUTPUT \u00a0 \u00a0 \u00a0 \u00a0 \u7684\u89c4\u5219\u53ef\u4ee5\u5b58\u5728\u4e8e\uff1araw\u8868mangle\u8868\uff0cnat\u8868\uff0cfilter\u8868\u3002\r\n\r\nPOSTROUTING \u00a0 \u00a0 \u00a0\u7684\u89c4\u5219\u53ef\u4ee5\u5b58\u5728\u4e8e\uff1amangle\u8868\uff0cnat\u8868\u3002\r\n<\/pre>\n
\u4f46\u662f\uff0c\u6211\u4eec\u5728\u5b9e\u9645\u7684\u4f7f\u7528\u8fc7\u7a0b\u4e2d\uff0c\u5f80\u5f80\u662f\u901a\u8fc7<\/strong>“<\/strong>\u8868<\/strong>“<\/strong>\u4f5c\u4e3a\u64cd\u4f5c\u5165\u53e3\uff0c\u5bf9\u89c4\u5219\u8fdb\u884c\u5b9a\u4e49\u7684<\/strong>\uff0c\u4e4b\u6240\u4ee5\u6309\u7167\u4e0a\u8ff0\u8fc7\u7a0b\u4ecb\u7ecdiptables\uff0c\u662f\u56e0\u4e3a\u4ece”\u5173\u5361”\u7684\u89d2\u5ea6\u66f4\u5bb9\u6613\u4ece\u5165\u95e8\u7684\u89d2\u5ea6\u7406\u89e3\uff0c\u4f46\u662f\u4e3a\u4e86\u4ee5\u4fbf\u5728\u5b9e\u9645\u4f7f\u7528\u7684\u65f6\u5019\uff0c\u66f4\u52a0\u987a\u7545\u7684\u7406\u89e3\u5b83\u4eec\uff0c\u6b64\u5904\u6211\u4eec\u8fd8\u8981\u5c06\u5404”\u8868”\u4e0e”\u94fe”\u7684\u5173\u7cfb\u7f57\u5217\u51fa\u6765\uff0c<\/p>\n
\u8868\uff08\u529f\u80fd\uff09<–> \u00a0 \u94fe\uff08\u94a9\u5b50\uff09\uff1a<\/p>\n
raw \u00a0 \u00a0 \u8868\u4e2d\u7684\u89c4\u5219\u53ef\u4ee5\u88ab\u54ea\u4e9b\u94fe\u4f7f\u7528\uff1aPREROUTING\uff0cOUTPUT<\/p>\n
mangle \u00a0\u8868\u4e2d\u7684\u89c4\u5219\u53ef\u4ee5\u88ab\u54ea\u4e9b\u94fe\u4f7f\u7528\uff1aPREROUTING\uff0cINPUT\uff0cFORWARD\uff0cOUTPUT\uff0cPOSTROUTING<\/p>\n
nat \u00a0 \u00a0 \u8868\u4e2d\u7684\u89c4\u5219\u53ef\u4ee5\u88ab\u54ea\u4e9b\u94fe\u4f7f\u7528\uff1aPREROUTING\uff0cOUTPUT\uff0cPOSTROUTING\uff08centos7\u4e2d\u8fd8\u6709INPUT\uff0ccentos6\u4e2d\u6ca1\u6709\uff09<\/p>\n
filter \u00a0\u8868\u4e2d\u7684\u89c4\u5219\u53ef\u4ee5\u88ab\u54ea\u4e9b\u94fe\u4f7f\u7528\uff1aINPUT\uff0cFORWARD\uff0cOUTPUT<\/p>\n
 <\/p>\n
\u5176\u5b9e\u6211\u4eec\u8fd8\u9700\u8981\u6ce8\u610f\u4e00\u70b9\uff0c\u56e0\u4e3a\u6570\u636e\u5305\u7ecf\u8fc7\u4e00\u4e2a”\u94fe”\u7684\u65f6\u5019\uff0c\u4f1a\u5c06\u5f53\u524d\u94fe\u7684\u6240\u6709\u89c4\u5219\u90fd\u5339\u914d\u4e00\u904d\uff0c\u4f46\u662f\u5339\u914d\u65f6\u603b\u5f52\u8981\u6709\u987a\u5e8f\uff0c\u6211\u4eec\u5e94\u8be5\u4e00\u6761\u4e00\u6761\u7684\u53bb\u5339\u914d\uff0c\u800c\u4e14\u6211\u4eec\u8bf4\u8fc7\uff0c\u76f8\u540c\u529f\u80fd\u7c7b\u578b\u7684\u89c4\u5219\u4f1a\u6c47\u805a\u5728\u4e00\u5f20”\u8868”\u4e2d\uff0c\u90a3\u4e48\uff0c\u54ea\u4e9b”\u8868”\u4e2d\u7684\u89c4\u5219\u4f1a\u653e\u5728”\u94fe”\u7684\u6700\u524d\u9762\u6267\u884c\u5462\uff0c\u8fd9\u65f6\u5019\u5c31\u9700\u8981\u6709\u4e00\u4e2a\u4f18\u5148\u7ea7\u7684\u95ee\u9898\uff0c\u6211\u4eec\u8fd8\u62ffprerouting”\u94fe”\u505a\u56fe\u793a\u3002<\/p>\n
\"\"<\/p>\n
prerouting\u94fe\u4e2d\u7684\u89c4\u5219\u5b58\u653e\u4e8e\u4e09\u5f20\u8868\u4e2d\uff0c\u800c\u8fd9\u4e09\u5f20\u8868\u4e2d\u7684\u89c4\u5219\u6267\u884c\u7684\u4f18\u5148\u7ea7\u5982\u4e0b\uff1a<\/p>\n
raw –> mangle –> nat<\/p>\n
\u4f46\u662f\u6211\u4eec\u77e5\u9053\uff0ciptables\u4e3a\u6211\u4eec\u5b9a\u4e49\u4e864\u5f20”\u8868”,\u5f53\u4ed6\u4eec\u5904\u4e8e\u540c\u4e00\u6761”\u94fe”\u65f6\uff0c\u6267\u884c\u7684\u4f18\u5148\u7ea7\u5982\u4e0b\u3002<\/p>\n
\u4f18\u5148\u7ea7\u6b21\u5e8f\uff08\u7531\u9ad8\u800c\u4f4e\uff09\uff1a<\/p>\n
raw –> mangle –> nat –> filter<\/p>\n
\u4f46\u662f\u6211\u4eec\u524d\u9762\u8bf4\u8fc7\uff0c\u67d0\u4e9b\u94fe\u5929\u751f\u5c31\u4e0d\u80fd\u4f7f\u7528\u67d0\u4e9b\u8868\u4e2d\u7684\u89c4\u5219\uff0c\u6240\u4ee5\uff0c4\u5f20\u8868\u4e2d\u7684\u89c4\u5219\u5904\u4e8e\u540c\u4e00\u6761\u94fe\u7684\u76ee\u524d\u53ea\u6709output\u94fe\uff0c\u5b83\u5c31\u662f\u4f20\u8bf4\u4e2d\u6d77\u9646\u7a7a\u90fd\u80fd\u9632\u5b88\u7684\u5173\u5361\u3002<\/p>\n
 <\/p>\n
\u4e3a\u4e86\u66f4\u65b9\u4fbf\u7684\u7ba1\u7406\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u5728\u67d0\u4e2a\u8868\u91cc\u9762\u521b\u5efa\u81ea\u5b9a\u4e49\u94fe\uff0c\u5c06\u9488\u5bf9\u67d0\u4e2a\u5e94\u7528\u7a0b\u5e8f\u6240\u8bbe\u7f6e\u7684\u89c4\u5219\u653e\u7f6e\u5728\u8fd9\u4e2a\u81ea\u5b9a\u4e49\u94fe\u4e2d\uff0c\u4f46\u662f\u81ea\u5b9a\u4e49\u94fe\u63a5\u4e0d\u80fd\u76f4\u63a5\u4f7f\u7528\uff0c\u53ea\u80fd\u88ab\u67d0\u4e2a\u9ed8\u8ba4\u7684\u94fe\u5f53\u505a\u52a8\u4f5c\u53bb\u8c03\u7528\u624d\u80fd\u8d77\u4f5c\u7528\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u60f3\u8c61\uff0c\u81ea\u5b9a\u4e49\u94fe\u5c31\u662f\u4e00\u6bb5\u6bd4\u8f83”\u77ed”\u7684\u94fe\u5b50\uff0c\u8fd9\u6761”\u77ed”\u94fe\u5b50\u4e0a\u7684\u89c4\u5219\u90fd\u662f\u9488\u5bf9\u67d0\u4e2a\u5e94\u7528\u7a0b\u5e8f\u5236\u5b9a\u7684\uff0c\u4f46\u662f\u8fd9\u6761\u77ed\u7684\u94fe\u5b50\u5e76\u4e0d\u80fd\u76f4\u63a5\u4f7f\u7528\uff0c\u800c\u662f\u9700\u8981”\u710a\u63a5”\u5728iptables\u9ed8\u8ba4\u5b9a\u4e49\u94fe\u5b50\u4e0a\uff0c\u624d\u80fd\u88abIPtables\u4f7f\u7528\uff0c\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u9ed8\u8ba4\u5b9a\u4e49\u7684”\u94fe”\u9700\u8981\u628a”\u81ea\u5b9a\u4e49\u94fe”\u5f53\u505a”\u52a8\u4f5c”\u53bb\u5f15\u7528\u7684\u539f\u56e0\u3002\u8fd9\u662f\u540e\u8bdd\uff0c\u540e\u9762\u518d\u804a\uff0c\u5728\u5b9e\u9645\u4f7f\u7528\u65f6\u6211\u4eec\u5373\u53ef\u66f4\u52a0\u7684\u660e\u767d\u3002<\/p>\n
\u6570\u636e\u7ecf\u8fc7\u9632\u706b\u5899\u7684\u6d41\u7a0b<\/strong><\/h3>\n
\n
\u7ed3\u5408\u4e0a\u8ff0\u6240\u6709\u7684\u63cf\u8ff0\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u6570\u636e\u5305\u901a\u8fc7\u9632\u706b\u5899\u7684\u6d41\u7a0b\u603b\u7ed3\u4e3a\u4e0b\u56fe\uff1a<\/p>\n
\"\"<\/p>\n
\u6211\u4eec\u5728\u5199Iptables\u89c4\u5219\u7684\u65f6\u5019\uff0c\u8981\u65f6\u523b\u7262\u8bb0\u8fd9\u5f20\u8def\u7531\u6b21\u5e8f\u56fe\uff0c\u7075\u6d3b\u914d\u7f6e\u89c4\u5219\u3002<\/p>\n
\u6211\u4eec\u5c06\u7ecf\u5e38\u7528\u5230\u7684\u5bf9\u5e94\u5173\u7cfb\u91cd\u65b0\u5199\u5728\u6b64\u5904\uff0c\u65b9\u4fbf\u5bf9\u5e94\u56fe\u4f8b\u67e5\u770b\u3002<\/p>\n
\u94fe\u7684\u89c4\u5219\u5b58\u653e\u4e8e\u54ea\u4e9b\u8868\u4e2d\uff08\u4ece\u94fe\u5230\u8868\u7684\u5bf9\u5e94\u5173\u7cfb\uff09\uff1a<\/p>\n
PREROUTING \u00a0 \u7684\u89c4\u5219\u53ef\u4ee5\u5b58\u5728\u4e8e\uff1araw\u8868\uff0cmangle\u8868\uff0cnat\u8868\u3002<\/p>\n
INPUT \u00a0 \u00a0 \u00a0 \u00a0\u7684\u89c4\u5219\u53ef\u4ee5\u5b58\u5728\u4e8e\uff1amangle\u8868\uff0cfilter\u8868\uff0c\uff08centos7\u4e2d\u8fd8\u6709nat\u8868\uff0ccentos6\u4e2d\u6ca1\u6709\uff09\u3002<\/p>\n
FORWARD \u00a0 \u00a0 \u00a0\u7684\u89c4\u5219\u53ef\u4ee5\u5b58\u5728\u4e8e\uff1amangle\u8868\uff0cfilter\u8868\u3002<\/p>\n
OUTPUT \u00a0 \u00a0 \u00a0 \u7684\u89c4\u5219\u53ef\u4ee5\u5b58\u5728\u4e8e\uff1araw\u8868mangle\u8868\uff0cnat\u8868\uff0cfilter\u8868\u3002<\/p>\n
POSTROUTING \u00a0\u7684\u89c4\u5219\u53ef\u4ee5\u5b58\u5728\u4e8e\uff1amangle\u8868\uff0cnat\u8868\u3002<\/p>\n
 <\/p>\n
\u8868\u4e2d\u7684\u89c4\u5219\u53ef\u4ee5\u88ab\u54ea\u4e9b\u94fe\u4f7f\u7528\uff08\u4ece\u8868\u5230\u94fe\u7684\u5bf9\u5e94\u5173\u7cfb\uff09\uff1a<\/p>\n
raw \u00a0 \u00a0 \u8868\u4e2d\u7684\u89c4\u5219\u53ef\u4ee5\u88ab\u54ea\u4e9b\u94fe\u4f7f\u7528\uff1aPREROUTING\uff0cOUTPUT<\/p>\n
mangle \u00a0\u8868\u4e2d\u7684\u89c4\u5219\u53ef\u4ee5\u88ab\u54ea\u4e9b\u94fe\u4f7f\u7528\uff1aPREROUTING\uff0cINPUT\uff0cFORWARD\uff0cOUTPUT\uff0cPOSTROUTING<\/p>\n
nat \u00a0 \u00a0 \u8868\u4e2d\u7684\u89c4\u5219\u53ef\u4ee5\u88ab\u54ea\u4e9b\u94fe\u4f7f\u7528\uff1aPREROUTING\uff0cOUTPUT\uff0cPOSTROUTING\uff08centos7\u4e2d\u8fd8\u6709INPUT\uff0ccentos6\u4e2d\u6ca1\u6709\uff09<\/p>\n
filter \u00a0\u8868\u4e2d\u7684\u89c4\u5219\u53ef\u4ee5\u88ab\u54ea\u4e9b\u94fe\u4f7f\u7528\uff1aINPUT\uff0cFORWARD\uff0cOUTPUT<\/p>\n
\u4e0b\u56fe\u4e2dnat\u8868\u5728centos7\u4e2d\u7684\u60c5\u51b5\u5c31\u4e0d\u518d\u6807\u660e\u3002<\/p>\n
\"\"<\/p>\n
 <\/p>\n
 <\/p>\n
\u89c4\u5219\u7684\u6982\u5ff5<\/strong><\/h3>\n
\n
\u8bf4\u4e86\u4e00\u5708\u53c8\u8bf4\u56de\u6765\u4e86\uff0c\u5728\u4e0a\u8ff0\u63cf\u8ff0\u4e2d\u6211\u4eec\u4e00\u76f4\u5728\u63d0\u89c4\u5219\uff0c\u53ef\u662f\u6ca1\u6709\u7ec6\u8bf4\uff0c\u73b0\u5728\u8bf4\u8bf4\u5b83\u3002<\/p>\n
\u5148\u8bf4\u8bf4\u89c4\u5219\u7684\u6982\u5ff5\uff0c\u7136\u540e\u518d\u901a\u4fd7\u7684\u89e3\u91ca\u5b83\u3002<\/p>\n
\u89c4\u5219\uff1a\u6839\u636e\u6307\u5b9a\u7684\u5339\u914d\u6761\u4ef6\u6765\u5c1d\u8bd5\u5339\u914d\u6bcf\u4e2a\u6d41\u7ecf\u6b64\u5904\u7684\u62a5\u6587\uff0c\u4e00\u65e6\u5339\u914d\u6210\u529f\uff0c\u5219\u7531\u89c4\u5219\u540e\u9762\u6307\u5b9a\u7684\u5904\u7406\u52a8\u4f5c\u8fdb\u884c\u5904\u7406\uff1b<\/p>\n
\u90a3\u4e48\u6211\u4eec\u6765\u901a\u4fd7\u7684\u89e3\u91ca\u4e00\u4e0b\u4ec0\u4e48\u662fiptables\u7684\u89c4\u5219\uff0c\u4e4b\u524d\u6253\u8fc7\u4e00\u4e2a\u6bd4\u65b9\uff0c\u6bcf\u6761”\u94fe”\u90fd\u662f\u4e00\u4e2a”\u5173\u5361”\uff0c\u6bcf\u4e2a\u901a\u8fc7\u8fd9\u4e2a”\u5173\u5361”\u7684\u62a5\u6587\u90fd\u8981\u5339\u914d\u8fd9\u4e2a\u5173\u5361\u4e0a\u7684\u89c4\u5219\uff0c\u5982\u679c\u5339\u914d\uff0c\u5219\u5bf9\u62a5\u6587\u8fdb\u884c\u5bf9\u5e94\u7684\u5904\u7406\uff0c\u6bd4\u5982\u8bf4\uff0c\u4f60\u6211\u4e8c\u4eba\u6b64\u523b\u5c31\u597d\u50cf\u4e24\u4e2a”\u62a5\u6587”\uff0c\u4f60\u6211\u4e8c\u4eba\u6b64\u523b\u90fd\u8981\u5165\u5173\uff0c\u53ef\u662f\u57ce\u4e3b\u6709\u547d\uff0c\u53ea\u6709\u5668\u5b87\u8f69\u6602\u7684\u4eba\u624d\u80fd\u5165\u5173\uff0c\u4e0d\u7b26\u5408\u6b64\u6761\u4ef6\u7684\u4eba\u4e0d\u80fd\u5165\u5173\uff0c\u4e8e\u662f\u5b88\u5173\u5c06\u58eb\u6309\u7167\u57ce\u4e3b\u5236\u5b9a\u7684”\u89c4\u5219”\uff0c\u5f00\u59cb\u6253\u91cf\u4f60\u6211\u4e8c\u4eba\uff0c\u6700\u7ec8\uff0c\u4f60\u987a\u5229\u5165\u5173\u4e86\uff0c\u800c\u6211\u5df2\u88ab\u62d2\u4e4b\u95e8\u5916\uff0c\u56e0\u4e3a\u4f60\u7b26\u5408”\u5668\u5b87\u8f69\u6602”\u7684\u6807\u51c6\uff0c\u6240\u4ee5\u628a\u4f60”\u653e\u884c”\u4e86\uff0c\u800c\u6211\u4e0d\u7b26\u5408\u6807\u51c6\uff0c\u6240\u4ee5\u6ca1\u6709\u88ab\u653e\u884c\uff0c\u5176\u5b9e\uff0c”\u5668\u5b87\u8f69\u6602”\u5c31\u662f\u4e00\u79cd”\u5339\u914d\u6761\u4ef6”\uff0c”\u653e\u884c”\u5c31\u662f\u4e00\u79cd”\u52a8\u4f5c”\uff0c”\u5339\u914d\u6761\u4ef6”\u4e0e”\u52a8\u4f5c”\u7ec4\u6210\u4e86\u89c4\u5219\u3002<\/p>\n
\u4e86\u89e3\u4e86\u89c4\u5219\u7684\u6982\u5ff5\uff0c\u90a3\u6211\u4eec\u6765\u804a\u804a\u89c4\u5219\u7684\u7ec4\u6210\u90e8\u5206,\u6b64\u5904\u53ea\u662f\u5927\u6982\u7684\u5c06\u89c4\u5219\u7684\u7ed3\u6784\u5217\u51fa\uff0c\u540e\u9762\u7684\u6587\u7ae0\u4e2d\u4f1a\u5355\u72ec\u5bf9\u89c4\u5219\u8fdb\u884c\u603b\u7ed3\u3002<\/p>\n
\u89c4\u5219\u7531\u5339\u914d\u6761\u4ef6\u548c\u5904\u7406\u52a8\u4f5c\u7ec4\u6210\u3002<\/p>\n
\u5339\u914d\u6761\u4ef6<\/strong><\/h3>\n
\n
\u5339\u914d\u6761\u4ef6\u5206\u4e3a\u57fa\u672c\u5339\u914d\u6761\u4ef6\u4e0e\u6269\u5c55\u5339\u914d\u6761\u4ef6<\/p>\n
\u57fa\u672c\u5339\u914d\u6761\u4ef6\uff1a<\/strong><\/p>\n
\u6e90\u5730\u5740Source IP\uff0c\u76ee\u6807\u5730\u5740 Destination IP<\/p>\n
\u4e0a\u8ff0\u5185\u5bb9\u90fd\u53ef\u4ee5\u4f5c\u4e3a\u57fa\u672c\u5339\u914d\u6761\u4ef6\u3002<\/p>\n
\u6269\u5c55\u5339\u914d\u6761\u4ef6\uff1a<\/strong><\/p>\n
\u9664\u4e86\u4e0a\u8ff0\u7684\u6761\u4ef6\u53ef\u4ee5\u7528\u4e8e\u5339\u914d\uff0c\u8fd8\u6709\u5f88\u591a\u5176\u4ed6\u7684\u6761\u4ef6\u53ef\u4ee5\u7528\u4e8e\u5339\u914d\uff0c\u8fd9\u4e9b\u6761\u4ef6\u6cdb\u79f0\u4e3a\u6269\u5c55\u6761\u4ef6\uff0c\u8fd9\u4e9b\u6269\u5c55\u6761\u4ef6\u5176\u5b9e\u4e5f\u662fnetfilter\u4e2d\u7684\u4e00\u90e8\u5206\uff0c\u53ea\u662f\u4ee5\u6a21\u5757\u7684\u5f62\u5f0f\u5b58\u5728\uff0c\u5982\u679c\u60f3\u8981\u4f7f\u7528\u8fd9\u4e9b\u6761\u4ef6\uff0c\u5219\u9700\u8981\u4f9d\u8d56\u5bf9\u5e94\u7684\u6269\u5c55\u6a21\u5757\u3002<\/p>\n
\u6e90\u7aef\u53e3Source Port, \u76ee\u6807\u7aef\u53e3Destination Port<\/p>\n
\u4e0a\u8ff0\u5185\u5bb9\u90fd\u53ef\u4ee5\u4f5c\u4e3a\u6269\u5c55\u5339\u914d\u6761\u4ef6<\/p>\n
\u5904\u7406\u52a8\u4f5c<\/strong><\/h3>\n
\n
\u5904\u7406\u52a8\u4f5c\u5728iptables\u4e2d\u88ab\u79f0\u4e3atarget\uff08\u8fd9\u6837\u8bf4\u5e76\u4e0d\u51c6\u786e\uff0c\u6211\u4eec\u6682\u4e14\u8fd9\u6837\u79f0\u547c\uff09\uff0c\u52a8\u4f5c\u4e5f\u53ef\u4ee5\u5206\u4e3a\u57fa\u672c\u52a8\u4f5c\u548c\u6269\u5c55\u52a8\u4f5c\u3002<\/p>\n
\u6b64\u5904\u5217\u51fa\u4e00\u4e9b\u5e38\u7528\u7684\u52a8\u4f5c\uff0c\u4e4b\u540e\u7684\u6587\u7ae0\u4f1a\u5bf9\u5b83\u4eec\u8fdb\u884c\u8be6\u7ec6\u7684\u793a\u4f8b\u4e0e\u603b\u7ed3\uff1a<\/p>\n
ACCEPT<\/strong>\uff1a\u5141\u8bb8\u6570\u636e\u5305\u901a\u8fc7\u3002<\/p>\n
DROP<\/strong>\uff1a\u76f4\u63a5\u4e22\u5f03\u6570\u636e\u5305\uff0c\u4e0d\u7ed9\u4efb\u4f55\u56de\u5e94\u4fe1\u606f\uff0c\u8fd9\u65f6\u5019\u5ba2\u6237\u7aef\u4f1a\u611f\u89c9\u81ea\u5df1\u7684\u8bf7\u6c42\u6ce5\u725b\u5165\u6d77\u4e86\uff0c\u8fc7\u4e86\u8d85\u65f6\u65f6\u95f4\u624d\u4f1a\u6709\u53cd\u5e94\u3002<\/p>\n
REJECT<\/strong>\uff1a\u62d2\u7edd\u6570\u636e\u5305\u901a\u8fc7\uff0c\u5fc5\u8981\u65f6\u4f1a\u7ed9\u6570\u636e\u53d1\u9001\u7aef\u4e00\u4e2a\u54cd\u5e94\u7684\u4fe1\u606f\uff0c\u5ba2\u6237\u7aef\u521a\u8bf7\u6c42\u5c31\u4f1a\u6536\u5230\u62d2\u7edd\u7684\u4fe1\u606f\u3002<\/p>\n
SNAT<\/strong>\uff1a\u6e90\u5730\u5740\u8f6c\u6362\uff0c\u89e3\u51b3\u5185\u7f51\u7528\u6237\u7528\u540c\u4e00\u4e2a\u516c\u7f51\u5730\u5740\u4e0a\u7f51\u7684\u95ee\u9898\u3002<\/p>\n
MASQUERADE<\/strong>\uff1a\u662fSNAT\u7684\u4e00\u79cd\u7279\u6b8a\u5f62\u5f0f\uff0c\u9002\u7528\u4e8e\u52a8\u6001\u7684\u3001\u4e34\u65f6\u4f1a\u53d8\u7684ip\u4e0a\u3002<\/p>\n
DNAT<\/strong>\uff1a\u76ee\u6807\u5730\u5740\u8f6c\u6362\u3002<\/p>\n
REDIRECT<\/strong>\uff1a\u5728\u672c\u673a\u505a\u7aef\u53e3\u6620\u5c04\u3002<\/p>\n
LOG<\/strong>\uff1a\u5728\/var\/log\/messages\u6587\u4ef6\u4e2d\u8bb0\u5f55\u65e5\u5fd7\u4fe1\u606f\uff0c\u7136\u540e\u5c06\u6570\u636e\u5305\u4f20\u9012\u7ed9\u4e0b\u4e00\u6761\u89c4\u5219\uff0c\u4e5f\u5c31\u662f\u8bf4\u9664\u4e86\u8bb0\u5f55\u4ee5\u5916\u4e0d\u5bf9\u6570\u636e\u5305\u505a\u4efb\u4f55\u5176\u4ed6\u64cd\u4f5c\uff0c\u4ecd\u7136\u8ba9\u4e0b\u4e00\u6761\u89c4\u5219\u53bb\u5339\u914d\u3002<\/p>\n
\u5c0f\u7ed3<\/strong><\/h3>\n
\n
iptables\u7684\u5b9e\u9645\u64cd\u4f5c\u6211\u4eec\u4f1a\u53e6\u5916\u603b\u7ed3\u4e3a\u5176\u4ed6\u6587\u7ae0\uff0ciptables\u7cfb\u5217\u6587\u7ae0\u5217\u8868\u76f4\u8fbe\u94fe\u63a5\u5982\u4e0b\uff1a<\/p>\n
iptables\u96f6\u57fa\u7840\u5feb\u901f\u5165\u95e8\u7cfb\u5217<\/a><\/p>\n
 <\/p>\n
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