{"id":52,"date":"2005-01-27T21:06:14","date_gmt":"2005-01-27T13:06:14","guid":{"rendered":"http:\/\/yesybl.org\/blogcn\/2005\/01\/27\/52\/"},"modified":"2005-01-27T21:06:14","modified_gmt":"2005-01-27T13:06:14","slug":"iptables-eoaoe-2","status":"publish","type":"post","link":"https:\/\/www.yesybl.com\/?p=52","title":{"rendered":"iptables \u4f7f\u7528\u7b80\u4ecb"},"content":{"rendered":"

\u8655\u7406 firewall rule \u7684\u9078\u9805<\/p>\n

\u4e14\u4e0d\u5fd9\u8457\u8a2d\u8a08\u751a\u9ebc\u7684\uff0c\u5148\u4f86\u71b1\u71b1\u8eab\ufe30<\/p>\n

# iptables -A INPUT -j ACCEPT<\/p><\/blockquote>\n

\u5927\u5c0f\u6977\u7d55\u4e0d\u53ef\u4ee5\u4e82\uff01\u8f38\u5165\u9019\u689d rule \u5f8c\uff0c\u7528 “iptables -L -v -n” \u8a72\u770b\u5230\u985e\u4f3c\u4ee5\u4e0b\u7d50\u679c\ufe30<\/p>\n

Chain INPUT (policy ACCEPT 2939 packets, 1124863 bytes)\n\n pkts bytes target     prot opt in     out     source               destination\n\n     1   241 ACCEPT     all  --  *      *       0.0.0.0\/0            0.0.0.0\/0<\/pre>\n
\u5b83\u8868\u793a\u751a\u9ebc\u5462\uff1f-A \u662f append\uff0c\u5b83\u6703\u5728 INPUT\u3001FORWARD\u3001OUTPUT \u5176\u4e2d\u4e00\u689d “chain” \u88e1\u52a0\u4e00\u689d “rule” \u800c\u9019\u689d rule \u5728\u96a8\u5f8c\u7684\u53c3\u6578\u5c07\u6703\u898b\u5230\u3002\u800c -j \u5462\uff0c\u5247\u662f\u5b9a\u7fa9\u7a76\u7adf\u90a3\u4e9b packet \u8a72\u600e\u6a23\u8655\u7406\u3002\u73fe\u5728\u662f ACCEPT\uff0c\u5373\u8b93\u5b83\u901a\u904e\u3002\u5982\u679c\u4e0d\u60f3\u8b93\u4efb\u4f55 packet \u901a\u904e\u5462\uff1f\u5341\u5206\u7c21\u55ae\ufe30<\/p>\n
# iptables -R INPUT 1 -j DROP<\/p><\/blockquote>\n
\u4eca\u6b21\u7531 ACCEPT \u8b8a DROP\uff0c\u5c31\u4e0d\u6703\u6709\u4efb\u4f55 packet \u53ef\u4ee5\u904e\u95dc\u4e86\u3002\u4f46\u2026\u2026 -R \u53c8\u662f\u751a\u9ebc\uff1f\u90a3\u662f replace \u7684\u610f\u601d\uff0c\u96a8\u5f8c\u7684 “INPUT 1” \u5373 replace \u4e86\u7b2c\u4e00\u689d chain\uff0c\u5373\u525b\u624d ACCEPT \u90a3\u4e00\u689d\u5440\uff01<\/p>\n
\u7576\u7136\uff0cfirewall \u7684\u529f\u7528\u4e0d\u53ef\u80fd\u662f\u7981\u6b62\u4efb\u4f55 traffic \u5427\uff01\u56e0\u6b64\u8b93\u6211\u5011\u5148\u6e05\u9664\u5b83\ufe30<\/p>\n
# iptables -D INPUT 1<\/p><\/blockquote>\n
-D \u8868\u793a delete\uff0c\u7528\u6cd5\u548c\u4e0a\u9762\u7684 -R \u4e00\u6a23\u3002\u9664\u4e86 -A\u3001-R\u3001-D \u5916\u9084\u6709 -I \u8868\u793a insert\uff1b-A \u662f\u9010\u689d\u9010\u689d rule \u52a0\u4e0a\u53bb\uff0c-I \u5247\u662f\u5728\u6574\u4e32\u7684 rule \u4e2d\u9593\u52a0\u63d2\u67d0\u4e00\u689d rule\uff0c\u9664\u6b64\u4e4b\u5916\u6c92\u6709\u5176\u5b83\u5206\u5225\u4e86\u3002<\/p>\n
\u6700\u5f8c\u9084\u6709 -F \u8868\u793a flush\uff0c\u9867\u540d\u601d\u7fa9\u5b83\u6703\u628a\u4f60\u8f9b\u8f9b\u82e6\u82e6 set \u597d\u7684 rule \u90fd\u6c96\u9032\u99ac\u6876\u88e1\uff01<\/p>\n
\u6709\u95dc IP address \u7684\u9078\u9805<\/h3>\n
\u518d\u591a\u9ede\u71b1\u8eab\u624d\u597d\u8fa6\u4e8b\uff0c\u8a66\u8a66\u5427\ufe30<\/p>\n
# iptables -A INPUT -s 199.95.206.201 -j DROP<\/p><\/blockquote>\n
\u70ba\u751a\u9ebc\u7528\u9019\u500b IP \u4f5c\u793a\u7bc4\uff1f\u7e3d\u4e4b\u662f\u500b\u8a0e\u4eba\u53ad\u7684\u5730\u65b9\u5427\uff01\u4e0d\u8981\u554f\u4e86\uff01\u4e00\u53e5\u8aaa\u5b8c\uff0c\u5c31\u662f block \u4e86\u9019\u4e00\u500b IP \u4e0d\u51c6\u5b83\u6709\u4efb\u4f55 traffic \u9032\u5165\u81ea\u5df1\u7684\u5730\u76e4\u3002\u4e0d\u55ae\u662f\u4e00\u500b IP\uff0c\u4e00\u500b range \u7684 IP \u4e5f\u53ef\u4ee5\ufe30<\/p>\n
# iptables -A INPUT -s 10.0.0.0\/8 -j DROP<\/p><\/blockquote>\n
\u5982\u679c\u4f60\u7684 LAN \u662f\u4f7f\u7528 192.168.0.x \u7684\uff0c\u90a3\u7576\u7136\u4e0d\u5e0c\u671b\u6709 10.x.x.x \u5730\u5740\u51fa\u73fe\uff01\u56e0\u6b64 DROP \u4e86\u9019\u7a2e IP \u662f\u5f88\u6b63\u5e38\u7684\u3002<\/p>\n
\u4e0a\u9762\u5169\u500b\u4f8b\u5b50\u662f\u7528 -s(\u5373 source IP)\u7684\uff0c\u4e14\u770b\u770b\u5b83\u7684\u53cd\u9762\uff0c\u5373 -d(destination)\u7684\u4f8b\u5b50\ufe30<\/p>\n
# iptables -A INPUT -d 192.168.0.1 -j DROP<\/p><\/blockquote>\n
\u5047\u8a2d\u4f60\u7684 IP \u662f 192.168.0.2 \u5427\uff0c\u90a3\u9ebc\u9019\u689d rule \u5c0d\u4f60\u5b8c\u5168\u6c92\u6709\u5f71\u97ff\uff1b\u76f8\u53cd\uff0c\u82e5\u4f60\u7684 IP \u662f 192.168.0.1\uff0c\u90a3\u4efb\u4f55\u5230\u4f60\u7684\u6a5f\u5668\u7684 packet \u90fd\u6703\u88ab DROP \u4e86\u3002<\/p>\n
-s \u548c -d \u53ef\u4ee5\u653e\u5728\u4e00\u8d77\u7528\uff0c\u800c\u4e14\u5b83\u5011\u548c IP address \u4e4b\u9593\u53ef\u4ee5\u653e\u4e00\u500b\u5606\u865f(\uff01)\u8868\u793a “not” \u7684\u610f\u601d\u3002\u4f8b\u5982\ufe30<\/p>\n
# iptables -P INPUT DROP
\n# iptables -A INPUT -s ! 192.168.0.3 -d 192.168.0.0\/24 -j ACCEPT<\/p><\/blockquote>\n
\u7b46\u8005\u6f0f\u4e86 -P \u672a\u4ecb\u7d39\uff0c\u90a3\u662f default policy \u7684\u610f\u601d\uff0c\u5373\u9810\u5148\u5b9a\u7fa9\u5982\u679c\u751a\u9ebc rule \u4e5f\u4e0d\u80fd\u6c7a\u5b9a packet \u7684\u53bb\u5411\u7684\u6642\u5019\uff0c\u6703\u9810\u8a2d\u8b93\u5b83\u901a\u904e\u5462\uff0c\u9084\u662f\u9810\u8a2d\u62d2\u8af8\u9580\u5916\uff0c\u9084\u662f\u505a\u5176\u5b83\u52d5\u4f5c\u3002\u9019\u88e1\u9810\u8a2d\u662f DROP\u3002\u597d\u4e86\uff0c\u4e0b\u4e00\u53e5\u624d\u662f\u7b46\u8005\u60f3\u8b1b\u7684\uff0c\u610f\u601d\u662f\ufe30\u5982\u679c source \u4e0d\u662f 192.168.0.3\uff0c\u800c destination \u662f 192.168.0.x \u4efb\u4f55\u4e00\u500b IP\uff0c\u90fd\u6703\u8b93\u5b83\u901a\u904e\u3002\u90a3\u5373\u662f\u5c01\u6bba\u4e86 192.168.0.3\uff01<\/p>\n
\u5728\u770b\u4e0b\u4e00\u7bc0\u524d\uff0c\u5148\u6e05\u4e00\u6e05\u820a\u7684\u5783\u573e rules \u7f77\ufe30<\/p>\n
# iptables -F<\/p><\/blockquote>\n
\u6307\u5b9a network interface \u7684\u9078\u9805<\/h3>\n
\u5c6c\u65bc\u9019\u985e\u7684\u9078\u9805\u5f88\u5c11\uff0c\u548c\u4e0a\u9762\u7684\u4e00\u6a23\uff0c\u53ea\u6709\u5169\u500b\ufe30-i \u548c -o\u3002-i \u662f\u6307\u660e input \u7684 interface\uff0c\u53ea\u6703\u5728 INPUT chain \u6642\u6709\u7528\uff1b\u76f8\u53cd\uff0c-o \u662f output interface\uff0c\u53ea\u6703\u5728 output \u6642\u6709\u7528\u3002\u5148\u770b\u770b\u5be6\u4f8b\ufe30<\/p>\n
# iptables -A INPUT -i eth1 -s 192.168.0.0\/24 -d 192.168.0.0\/24 -j ACCEPT<\/p><\/blockquote>\n
\u5f88\u7c21\u55ae\uff0c\u63a5\u53d7\u6240\u6709 LAN \u7684 traffic \u7f77\u4e86\u3002\u4e0d\u904e\u9084\u52a0\u4e0a “-i eth1″\uff0c\u9632\u6b62 LAN \u5916\u6709\u4eba\u523b\u610f\u9001\u5165\u4e00\u4e9b\u5047\u7684 packet\uff0c\u626e\u6210\u662f\u5167\u90e8\u7684 traffic\u3002\u4f46\u9019\u500b\u5176\u5be6\u5df2\u4e0d\u9700\u8981\u4e86\uff0c\u56e0 kernel \u672c\u8eab\u5df2\u6709\u6a5f\u5236\u53ef\u9632\u6b62\u9019\u7a2e\u60c5\u6cc1\uff0c\u8f38\u5165\u4ee5\u4e0b\u4e00\u53e5\u5c31\u884c\uff0c\u89e3\u91cb\u5c31\u514d\u4e86\u3002^_^<\/p>\n
# echo ‘1’ > \/proc\/sys\/net\/ipv4\/conf\/all\/rp_filter<\/p><\/blockquote>\n
\u9084\u6709 -o\u2026\u2026\u7528\u4e00\u500b\u7c21\u55ae\u7684\u4f8b\u5b50\u5427\u3002<\/p>\n
# iptables -A OUTPUT -o ppp0 -d 205.138.3.22 -j REJECT<\/p><\/blockquote>\n
\u5176\u5be6\u4e26\u4e0d\u7c21\u55ae\u3002\u9996\u5148\uff0c-j REJECT \u548c -j DROP \u7684\u76f8\u540c\u4e4b\u8655\u90fd\u662f\u62d2\u7d55\uff0c\u4f46 DROP \u662f\u7576\u6c92\u4e8b\u767c\u751f\uff0cREJECT \u5247\u662f\u9001\u51fa\u56de\u61c9\u8aaa\u9019\u500b packet \u88ab REJECT \u4e86\u3002\u53e6\u5916\uff0c\u7dca\u8a18\ufe30-o \u662f\u548c OUTPUT chain \u4e00\u8d77\u7528\u7684\uff01\u81f3\u65bc\u90a3\u500b IP \u561b\u2026\u2026\u7e3d\u4e4b\u9019\u689d rule \u53ef\u9632\u6b62\u4f60\u7684\u8cc7\u6599\u5728\u4e0d\u77e5\u60c5\u7684\u60c5\u6cc1\u4e0b\u88ab\u9001\u51fa\u5230\u67d0\u9593\u5c08\u6536\u96c6\u5168\u4e16\u754c\u6240\u6709\u4eba\u7684\u4e0a\u7db2\u7fd2\u6163\u7b49\u8cc7\u6599\u7684\u516c\u53f8\u5427\uff01<\/p>\n
\u9019\u6050\u6015\u66ab\u6642\u5df2\u7d93\u5920\u4e00\u90e8\u4efd\u8b80\u8005\u5011\u5b78\u4e00\u6bb5\u6642\u9593\u4e86\u3002\u81f3\u65bc\u5176\u5b83\u65e9\u5df2\u61c2\u5f97\u9019\u65b9\u9762\u77e5\u8b58\u7684\u670b\u53cb\uff0c\u7b46\u8005\u8b39\u6b64\u81f4\u6b49\uff01\u5c07\u4f86\u5e0c\u671b\u6703\u6709\u6a5f\u6703\u548c\u5927\u5bb6\u63a2\u8a0e\u4e00\u4e9b\u8f03\u6df1\u5165\u7684\u8a2d\u5b9a\u5462\uff01<\/p>\n
iptables \u4e3b\u7db2\u5740\ufe30
\nhttp:\/\/netfilter.kernelnotes.org
\nhttp:\/\/netfilter.filewatcher.org
\nhttp:\/\/netfilter.samba.org<\/p>\n
ipchains \u7db2\u5740\ufe30
\nhttp:\/\/netfilter.kernelnotes.org\/ipchains\/
\nhttp:\/\/netfilter.filewatcher.org\/ipchains\/
\nhttp:\/\/netfilter.samba.org\/ipchains\/<\/p>\n
<\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
\u8655\u7406 firewall rule \u7684\u9078\u9805 \u4e14\u4e0d\u5fd9\u8457\u8a2d\u8a08\u751a\u9ebc\u7684\uff0c\u5148\u4f86\u71b1\u71b1\u8eab\ufe30 # iptables -A INPUT -j ACCEPT \u5927\u5c0f\u6977\u7d55\u4e0d\u53ef\u4ee5\u4e82\uff01\u8f38\u5165\u9019\u689d rule \u5f8c\uff0c\u7528 “iptables -L -v -n” \u8a72\u770b\u5230\u985e\u4f3c\u4ee5\u4e0b\u7d50\u679c\ufe30 Chain INPUT (policy ACCEPT 2939 packets, 1124863 bytes) pkts bytes target prot opt in out source destination 1 241 ACCEPT all — * * 0.0.0.0\/0 0.0.0.0\/0 \u5b83\u8868\u793a\u751a\u9ebc\u5462\uff1f-A \u662f append\uff0c\u5b83\u6703\u5728 INPUT\u3001FORWARD\u3001OUTPUT \u5176\u4e2d\u4e00\u689d “chain” \u88e1\u52a0\u4e00\u689d “rule” \u800c\u9019\u689d rule […]<\/p>\n<\/a>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pa4z28-Q","_links":{"self":[{"href":"https:\/\/www.yesybl.com\/index.php?rest_route=\/wp\/v2\/posts\/52"}],"collection":[{"href":"https:\/\/www.yesybl.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yesybl.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yesybl.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yesybl.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=52"}],"version-history":[{"count":0,"href":"https:\/\/www.yesybl.com\/index.php?rest_route=\/wp\/v2\/posts\/52\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.yesybl.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=52"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yesybl.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=52"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yesybl.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=52"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}