{"id":1864,"date":"2010-09-17T10:23:33","date_gmt":"2010-09-17T10:23:33","guid":{"rendered":"http:\/\/www.icocean.com\/blog\/?p=1864"},"modified":"1970-01-01T07:00:00","modified_gmt":"1970-01-01T07:00:00","slug":"%E7%AE%80%E9%87%8Aiptables%E9%98%B2%E7%81%AB%E5%A2%99","status":"publish","type":"post","link":"https:\/\/www.icocean.com\/blog\/?p=1864","title":{"rendered":"\u7b80\u91caiptables\u9632\u706b\u5899"},"content":{"rendered":"

\u4e00\u822cLINUX\u9632\u706b\u5899\uff08iptalbes\uff09\u7684\u8fd0\u7528\u65e0\u975e\u662f\u7528nat \u8868\uff08PREROUTING\u3001OUTPUT\u3001POSTROUTING\uff09\u548cfilter\u8868(FORWARD\u3001INPUT\u3001OUTPUT)\u3002\u6211\u4eec\u53ea\u6709\u77e5\u9053\u4e86\u6570\u636e\u7684\u6d41\u5411\u624d\u80fd\u6b63\u786e\u7684\u914d\u7f6e\u9632\u706b\u5899\u3002\u73b0\u7528\u4e00\u4e2a\u76f8\u5bf9\u6bd4\u8f83\u76f4\u89c2\u7684\u56fe\u5f62\u89e3\u91ca\u6570\u636e\u7684\u8d70\u5411\u3002<\/p>\n

\uff08\u6b64\u5904\u53ea\u4f5c\u6700\u57fa\u672c\u7684iptables\u6570\u636e\u6d41\u8d70\u5411\u8bf4\u660e\u3002\uff09
<\/a><\/p>\n

\u4e0a\u56fe\u662f\u4f60\u7684\u5bb6\uff0c\u84dd\u8272\u7684\u5708\u662f\u4f60\u5bb6\u9662\u5b50\uff0c\u6709\u4e24\u6247\u5927\u95e8\u2460\u2465\u8fdb\u51fa\uff0c\u4f60\u5bb6\u6709\u4e24\u4e2a\u623f\u95f4\uff0c\u5206\u522b\u4e3aeth0\u548c eth1\u623f\u95f4\uff0c\u6bcf\u4e2a\u623f\u95f4\u6709\u4e24\u4e2a\u95e8\u53ef\u4ee5\u8fdb\u51fa\u2461\u2462\u2463\u2464\u3002\u65c1\u8fb9\u662f\u5f20\u4e09\u548c\u674e\u56db\u7684\u5bb6\uff0c\u5f20\u4e09\u5bb6\u548c\u674e\u56db\u5bb6\u4e4b\u95f4\u7684\u5f80\u8fd4\u5fc5\u987b\u8981\u8fc7\u4f60\u5bb6\u9662\u5b50\u3002<\/p>\n

\u73b0\u5047\u8bbe\uff0ceth0\u7f51\u5361IP\u4e3a\uff1a192.168.5.1\u94fe\u63a5\u5185\u7f51\uff0ceth1\u7f51\u5361IP\u4e3a\uff1a218.100.100.111\u94fe\u63a5\u4e92\u8fde\u7f51\u3002<\/p>\n

\u518d\u5047\u8bbe\uff0c\u201c\u5f20\u4e09\u5bb6\u201d\u4e3a\u4e00\u4e2a\u5c40\u57df\u7f51\uff0c\u201c\u674e\u56db\u5bb6\u201d\u4e3a\u4e92\u8fde\u7f51\u3002\u8fdb\u6211\u5bb6\u9662\u5b50\u7528PREROUTING\uff0c\u51fa\u6211\u5bb6\u9662\u5b50\u7528FORWARD\uff0c\u8fdb\u6211\u5bb6\u95e8\u7528INPUT\uff0c\u51fa\u6211\u5bb6\u95e8\u7528OUTPUT\u3002\uff08\u5f53\u6211\u4eec\u7684\u64cd\u4f5c\u662f\u5f81\u5bf9\u670d\u52a1\u5668\u672c\u8eab\u800c\u8a00\u7684\u8bdd\uff0c\u5982SSH\u64cd\u4f5c\uff0c\u6b64\u65f6\u80af\u5b9a\u4f1a\u7528\u5230PREROUTING\u3001INPUT\u548cOUTPUT\uff0c\u5f53\u6570\u636e\u53ea\u662f\u901a\u8fc7\u670d\u52a1\u5668\u53bb\u8bbf\u95ee\u522b\u7684\u673a\u5668\u65f6\u4f1a\u7528\u5230PREROUTING\u548cFORWARD\u3002\uff09<\/p>\n

\u53c8\u5047\u8bbe\uff0c\u9ed8\u8ba4\u8fd9\u516d\u4e2a\u95e8\u90fd\u662f\u5173\u7684\u3002\u751f\u6210\u5982\u4e0b\u4ee3\u7801\u3002<\/p>\n

###########################################################################<\/p>\n

*nat<\/p>\n

################################<\/p>\n

:PREROUTING    DROP [0:0]<\/p>\n

:OUTPUT         DROP [0:0]<\/p>\n

:POSTROUTING   DROP [0:0]<\/p>\n

################################<\/p>\n

-F<\/p>\n

-Z<\/p>\n

-X<\/p>\n

### \u4ee5\u540e\u8981\u65b0\u589e\u8bed\u53e5\u8bf7\u5728\u6b64\u5904\u589e\u52a0\u3002<\/p>\n

-L \u2013v<\/p>\n

COMMIT<\/p>\n

################################################<\/p>\n

*filter<\/p>\n

##############################<\/p>\n

:INPUT          DROP [0:0]<\/p>\n

:FORWARD      DROP [0:0]<\/p>\n

:OUTPUT        DROP [0:0]<\/p>\n

##############################<\/p>\n

-F<\/p>\n

-Z<\/p>\n

-X<\/p>\n

### \u4ee5\u540e\u8981\u65b0\u589e\u8bed\u53e5\u8bf7\u5728\u6b64\u5904\u589e\u52a0\u3002<\/p>\n

-L \u2013v<\/p>\n

COMMIT<\/p>\n

##########################################################################<\/p>\n

1\u3001 \u5c40\u57df\u7f51\u7528\u6237\u901a\u8fc7\u670d\u52a1\u5668\u5171\u4eab\u4e0a\u7f51<\/p>\n

(\u5373\u4ece\u5f20\u4e09\u5bb6\u5230\u674e\u56db\u5bb6)<\/p>\n

1)\u9996\u5148\u8fdb\u2460\u53f7\u95e8\uff0c\u518d\u4ece\u2465\u53f7\u95e8\u8d70\u51fa\u3002<\/p>\n

-A PREROUTING \u2013p tcp –dport 80 \u2013j ACCEPT #\u5141\u8bb8TCP 80\u7aef\u53e3\u901a\u8fc7\u670d\u52a1\u5668<\/p>\n

-A FORWARD \u2013p tcp –dport 80 \u2013j ACCEPT    #\u5141\u8bb8TCP80 \u7aef\u53e3\u8f6c\u53d1<\/p>\n

-A FORWARD \u2013p tcp –sport 80 \u2013j ACCEPT    #\u5141\u8bb8\u63a5\u6536\u5bf9\u65b9\u4e3aTCP80\u7aef\u53e3\u53cd\u56de\u7684\u4fe1\u606f<\/p>\n

2)\u5176\u6b21\uff0c\u7531\u4e8e\u6211\u4eec\u4e0a\u7f51\u6253\u7684\u662f\u57df\u540d\uff0c\u4e3a\u6b64\u6709\u4e00\u4e2a\u516c\u7f51DNS\u670d\u52a1\u5668\u4e3a\u6211\u4eec\u670d\u52a1\uff0c\u90a3\u5f53\u7136\u4e5f\u8981\u5141\u8bb8\u5185\u7f51\u673a\u5668\u4e0eDNS\u670d\u52a1\u5668\u7684\u6570\u636e\u8f6c\u53d1\u3002DNS\u7528UDP 53\u6216\u8005 TCP 53\u7aef\u53e3\u3002\u4e24\u8005\u7528\u5176\u4e00\u4e2a\u5c31\u884c\u3002<\/p>\n

-A PREROUTING \u2013p udp –dport 53 \u2013j ACCEPT  <\/p>\n

-A FORWARD \u2013p udp –dport 53 \u2013j ACCEPT     <\/p>\n

-A FORWARD \u2013p udp –sport 53 \u2013j ACCEPT     <\/p>\n

3\uff09\u518d\u6b21\uff0c\u7531\u4e8e\u5c40\u57df\u7f51\u7684\u5730\u5740\u5728\u516c\u7f51\u4e0a\u662f\u4e0d\u88ab\u5141\u8bb8\u7684\uff0c\u6240\u4ee5\u5728\u51fa\u516c\u7f51\u524d\u5e94\u8be5\u628a\u5176\u5730\u5740\u8f6c\u4e3a\u670d\u52a1\u5668\u5730\u5740\u8fdb\u884c\u4f2a\u88c5\u3002<\/p>\n

-A POSTROUTING \u2013s 192.168.5.0\/24 \u2013j SNAT \u2013to 218.100.100.111<\/p>\n

2\u3001 \u5141\u8bb8\u5c40\u57df\u7f51\u548c\u516c\u7f51\u53ef\u4ee5\u8bbf\u95ee\u670d\u52a1\u5668\u7684SSH<\/p>\n

\u5047\u8bbeSSH\u91c7\u7528\u9ed8\u8ba4\u7aef\u53e3TCP 22 \u3002\u6b64\u8981\u6c42\u76f8\u5f53\u4e8e\u8981\u8fdb\u6211\u7684\u5bb6\u7684TCP 22\u53f7\u95e8\uff0c\u4e3a\u6b64\u6211\u4eec\u9996\u5148\u8981\u8fdb\u6211\u5bb6\u9662\u5b50\uff0c\u7136\u540e\u518d\u8fdb\u6211\u5bb6\u95e8\uff0c\u6700\u540e\u8d70\u51fa\u6211\u5bb6\u95e8\u8fd9\u6837\u7684\u8fc7\u7a0b\u3002\u6b64\u64cd\u4f5c\u662f\u5f81\u5bf9\u670d\u52a1\u5668\u672c\u8eab\u7684\u64cd\u4f5c\u3002<\/p>\n

-A PREROUTING \u2013p tcp –dport 22 \u2013j ACCEPT<\/p>\n

-A INPUT \u2013p tcp –dport 22 \u2013j ACCEPT<\/p>\n

-A OUTPUT \u2013p tcp –sport 22 \u2013j ACCEPT<\/p>\n

3\u3001 \u5141\u8bb8\u5185\u7f51\u673a\u5668\u53ef\u4ee5\u767b\u5f55MSN\u548cQQ\u3002<\/p>\n

\uff08MSN\u548cQQ\u9ed8\u8ba4\u662f\u4e0d\u5141\u8bb8\u767b\u5f55\u7684\uff09QQ\u4e00\u822c\u6765\u8bf4\u53ef\u4ee5\u4eceTCP 80\u30018000\u3001443\u53caUDP 8000\u30014000\u767b\u5f55\uff0c\u800cMSN\u53ef\u4ee5\u4eceTCP 1863\u3001443\u767b\u5f55\u3002\u6211\u4eec\u767b\u5f55MSN\u548cQQ\u7684\u8fc7\u7a0b\u5c31\u8c61\u4e0a\u7f51\u4e00\u6837\uff0c\u4e5f\u662f\u53bb\u8bbf\u95ee\u8fdc\u7a0b\u670d\u52a1\u5668\u7684\u6307\u5b9a\u7aef\u53e3\uff0c\u6545\u800c\u6211\u4eec\u53ea\u7528\u6570\u636e\u8f6c\u53d1\u5373\u53ef\u3002<\/p>\n

-A PREROUTING \u2013p tcp –dport 1863 \u2013j ACCEPT<\/p>\n

-A PREROUTING \u2013p tcp –dport 443 \u2013j ACCEPT<\/p>\n

-A PREROUTING \u2013p tcp –dport 8000 \u2013j ACCEPT<\/p>\n

-A PREROUTING \u2013p udp –dport 8000 \u2013j ACCEPT<\/p>\n

-A PREROUTING \u2013p udp –dport 4000 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –dport 1863 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –sport 1863 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –dport 443 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –sport 443 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –dport 8000 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –sport 8000 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p udp –dport 8000 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p udp –sport 8000 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p udp –dport 4000 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p udp –sport 4000 \u2013j ACCEPT<\/p>\n

4\u3001 \u8ba9\u5185\u7f51\u673a\u5668\u53ef\u4ee5\u6536\u53d1\u90ae\u4ef6\u3002<\/p>\n

\u63a5\u6536\u90ae\u4ef6\u662f\u8bbf\u95ee\u8fdc\u7a0b\u670d\u52a1\u5668\u7684TCP 110\u7aef\u53e3\uff0c\u53d1\u9001\u90ae\u4ef6\u662f\u8bbf\u95eeTCP25\u7aef\u53e3\u3002\u7528\u6570\u636e\u8f6c\u53d1\u5373\u53ef\u3002<\/p>\n

-A PREROUTING \u2013p tcp –dport 110 \u2013j ACCEPT<\/p>\n

-A PREROUTING \u2013p tcp –dport 25 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –dport 110 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –sport 110 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –dport 25 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –sport 25 \u2013j ACCEPT<\/p>\n

5\u3001 \u5185\u90e8\u673a\u5668\u5bf9\u5916\u53d1\u5e03WEB\u3002<\/p>\n

\u8981\u628a\u5185\u7f51\u673a\u5668192.168.5.179\u7684WEB\u5bf9\u5916\u53d1\u5e03\u7684\u8bdd\uff0c\u76f8\u5f53\u4e8e\u662f\u4ece\u5916\u7f51\u8bbf\u95ee\u5185\u7f51\u3002\u4e0e\u7b2c1\u6b65\u64cd\u4f5c\u7684\u5c40\u57df\u7f51\u5171\u4eab\u4e0a\u7f51\u76f8\u540c\uff0c\u53ea\u662f\u8bbf\u95ee\u7684\u65b9\u5411\u6539\u53d8\u4e86\u3002\u662f\u4ece\u5185\u7f51\u8bbf\u95ee\u5916\u7f51\uff0c\u800c\u662f\u4ece\u5916\u7f51\u8bbf\u95ee\u5185\u7f51\u3002<\/p>\n

\u5f53\u516c\u7f51\u8bbf\u95ee\u670d\u52a1\u5668218.100.100.111\u65f6\uff0c\u9632\u706b\u5899\u628a\u5b83\u6620\u5c04\u5230\u5185\u7f51\u7684192.168.5.179\u7684TCP80\u4e0a\u3002\u5f53\u5185\u7f51\u673a\u5668\u8bbf\u95ee\u670d\u52a1\u5668218.100.100.111\u65f6\uff0c\u9632\u706b\u5899\u628a\u5b83\u6620\u5c04\u5230\u5185\u7f51\u7684192.168.5.179\u7684TCP80\u4e0a\u3002<\/p>\n

-A PREROUTING \u2013i eth0 \u2013p tcp \u2013d 218.100.100.111 –dport 80 \u2013j DNAT –to-destination 192.168.5.179:80<\/p>\n

-A PREROUTING \u2013i eth1 \u2013p tcp \u2013d 218.100.100.111 \u2013dport 80 \u2013j DNAT \u2013to-destination 192.168.5.179:80<\/p>\n

\uff08\u4ee5\u4e0a\u4e24\u53e5\u5fc5\u987b\u5199\u5728 \u2013A PREROUTING \u2013p tcp –dport 80 \u2013j ACCEPT \u524d\u9762\u3002\uff09<\/p>\n

TCP 80\u7aef\u53e3\u7684\u8f6c\u53d1\u5728\u7b2c1\u6b65\u5c31\u5df2\u505a\u8fc7\uff0c\u6b64\u5904\u5c31\u4e0d\u7528\u91cd\u590d\u5236\u4f5c\u4e86\u3002\u53e6\u5916\u5728<\/p>\n

-A POSTROUTING \u2013s 192.168.5.0\/24 \u2013j SNAT \u2013to 218.100.100.111 \u4e4b\u540e\u52a0\u4e0a\u4e00\u53e5:<\/p>\n

-A POSTROUTING \u2013p tcp –dport 80 \u2013j ACCEPT<\/p>\n

\u4e3a\u4ec0\u4e48\u8981\u52a0\u8fd9\u53e5\u8bdd\u5462\uff0c\u6211\u7684\u7406\u89e3\u662f\u8fd9\u6837\u7684\uff0c<\/p>\n

\u516c\u7f51\u8bbf\u95ee http:\/\/218.100.100.111\u65f6\uff1a\uff08\u5047\u8bbe\u516c\u7f51\u4e0a\u7528\u6237\u7684IP\u4e3a199.199.199.199,\u7aef\u53e312345\u4e3a\u968f\u673a\u7684\u4ea7\u751f\u7684\u3002\uff09<\/p>\n

\u6570\u636e\u6e90 \uff1a   ip:199.199.199.199   sport:12345<\/p>\n

\u6570\u636e\u76ee\u6807\uff1a ip:218.100.100.111   dport 80<\/p>\n

\u6b64\u65f6\uff0c\u901a\u8fc7-A PREROUTING \u2013i eth0 \u2013p tcp \u2013d 218.100.100.111 –dport 80 \u2013j DNAT –to-destination 192.168.5.179:80 \u544a\u8bc9199.199.199.199,\u60a8\u8981\u8bbf\u95ee\u7684\u771f\u6b63\u5730\u5740\u5e94\u8be5\u662f192.168.5.179:80,\u7136\u540e\u6211\u4eec\u901a\u8fc7-A POSTROUTING \u2013p tcp –dport 80 \u2013j ACCEPT \u76ee\u6807\u5730\u5740218.100.100.111:80\u4f2a\u88c5\u6210 192.168.5.179:80 \u3002<\/p>\n

\u6570\u636e\u6e90 \uff1a   ip:199.199.199.199   sport:12345<\/p>\n

\u6570\u636e\u76ee\u6807\uff1a ip:192.168.5.179     dport 80<\/p>\n

\u5f53192.168.5.179\u8fd4\u56de\u6570\u636e\u65f6\uff1a<\/p>\n

\u6570\u636e\u6e90 \uff1a   ip:192.168.5.179     sport:80<\/p>\n

\u6570\u636e\u76ee\u6807\uff1a ip:199.199.199.199   dport 12345<\/p>\n

\u6570\u636e\u7ecf\u8fc7 -A POSTROUTING \u2013s 192.168.5.0\/24 \u2013j SNAT \u2013to 218.100.100.111 \u540e\uff0c<\/p>\n

\u6570\u636e\u6e90 \uff1a   ip:218.100.100.111   sport:80<\/p>\n

\u6570\u636e\u76ee\u6807\uff1a ip:199.199.199.199   dport 12345<\/p>\n

6\u3001 \u5b8c\u6574\u7684iptables\u914d\u7f6e<\/p>\n

###########################################################################<\/p>\n

*nat<\/p>\n

################################<\/p>\n

:PREROUTING    DROP [0:0]<\/p>\n

:OUTPUT         DROP [0:0]<\/p>\n

:POSTROUTING   DROP [0:0]<\/p>\n

################################<\/p>\n

-F<\/p>\n

-Z<\/p>\n

-X<\/p>\n

-A PREROUTING \u2013i eth0 \u2013p tcp \u2013d 218.100.100.111 –dport 80 \u2013j DNAT –to-destination 192.168.5.179:80<\/p>\n

-A PREROUTING \u2013i eth1 \u2013p tcp \u2013d 218.100.100.111 –dport 80 \u2013j DNAT \u2013to-destination 192.168.5.179:80<\/p>\n

-A PREROUTING \u2013p tcp –dport 80 \u2013j ACCEPT<\/p>\n

-A PREROUTING \u2013p udp –dport 53 \u2013j ACCEPT  <\/p>\n

-A PREROUTING \u2013p tcp –dport 22 \u2013j ACCEPT<\/p>\n

-A PREROUTING \u2013p tcp –dport 1863 \u2013j ACCEPT<\/p>\n

-A PREROUTING \u2013p tcp –dport 443 \u2013j ACCEPT<\/p>\n

-A PREROUTING \u2013p tcp –dport 8000 \u2013j ACCEPT<\/p>\n

-A PREROUTING \u2013p udp –dport 8000 \u2013j ACCEPT<\/p>\n

-A PREROUTING \u2013p udp –dport 4000 \u2013j ACCEPT<\/p>\n

-A PREROUTING \u2013p tcp –dport 110 \u2013j ACCEPT<\/p>\n

-A PREROUTING \u2013p tcp –dport 25 \u2013j ACCEPT<\/p>\n

-A POSTROUTING \u2013s 192.168.5.0\/24 \u2013j SNAT \u2013to 218.100.100.111<\/p>\n

-A POSTROUTING \u2013p tcp –dport 80 \u2013j ACCEPT<\/p>\n

-L \u2013v<\/p>\n

COMMIT<\/p>\n

################################################<\/p>\n

*filter<\/p>\n

##############################<\/p>\n

:INPUT          DROP [0:0]<\/p>\n

:FORWARD      DROP [0:0]<\/p>\n

:OUTPUT        DROP [0:0]<\/p>\n

##############################<\/p>\n

-F<\/p>\n

-Z<\/p>\n

-X<\/p>\n

-A INPUT \u2013p tcp –dport 22 \u2013j ACCEPT<\/p>\n

-A OUTPUT \u2013p tcp –sport 22 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –dport 80 \u2013j ACCEPT   <\/p>\n

-A FORWARD \u2013p tcp –sport 80 \u2013j ACCEPT   <\/p>\n

-A FORWARD \u2013p udp –dport 53 \u2013j ACCEPT     <\/p>\n

-A FORWARD \u2013p udp –sport 53 \u2013j ACCEPT  <\/p>\n

-A FORWARD \u2013p tcp –dport 1863 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –sport 1863 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –dport 443 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –sport 443 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –dport 8000 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –sport 8000 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p udp –dport 8000 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p udp –sport 8000 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p udp –dport 4000 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p udp –sport 4000 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –dport 110 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –sport 110 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –dport 25 \u2013j ACCEPT<\/p>\n

-A FORWARD \u2013p tcp –sport 25 \u2013j ACCEPT<\/p>\n

-L \u2013v<\/p>\n

COMMIT<\/p>\n

##########################################################################<\/p>\n

7\u3001 \u5176\u5b83\u6ce8\u610f\u4e8b\u9879<\/p>\n

1)\u5728\u4f7f\u7528iptables\u9632\u706b\u5899\u4e4b\u524d\uff0c\u5fc5\u987b\u5148\u6253\u5f00IP\u8f6c\u53d1\u529f\u80fd\u3002<\/p>\n

# echo \u201c1\u201d > \/proc\/sys\/net\/ipv4\/ip_forward<\/p>\n

2)\u4ee5\u4e0a\u5185\u5bb9\uff08\u7b2c6\u6b65\u751f\u6210\u7684\u5185\u5bb9\uff09\u4fdd\u5b58\u5230 \/etc\/sysconfig\/iptables\u6587\u4ef6\u4e2d\u3002<\/p>\n

3\uff09\u6bcf\u4fee\u6539\u4e00\u6b21iptables\u6587\u4ef6\u540e\uff0c\u90fd\u8981\u91cd\u542fiptalbes<\/p>\n

    # service iptables restart<\/p>\n","protected":false},"excerpt":{"rendered":"

\u4e00\u822cLINUX\u9632\u706b\u5899\uff08iptalbes\uff09\u7684\u8fd0\u7528\u65e0\u975e\u662f\u7528nat \u8868\uff08PREROUTING\u3001OUTPUT\u3001POST […]<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[2525,2574,384],"class_list":["post-1864","post","type-post","status-publish","format-standard","hentry","category-linuxunix","tag-firewall","tag-iptables","tag-384","category-16-id","post-seq-1","post-parity-odd","meta-position-corners","fix"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1864","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1864"}],"version-history":[{"count":0,"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1864\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1864"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1864"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1864"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}