{"id":303,"date":"2013-06-18T21:12:20","date_gmt":"2013-06-18T13:12:20","guid":{"rendered":"http:\/\/www.ln.la\/?p=303"},"modified":"2013-06-18T21:12:20","modified_gmt":"2013-06-18T13:12:20","slug":"basic-application-for-linux-iptables-firewall-tutorial","status":"publish","type":"post","link":"https:\/\/www.lnlog.cn\/index.php\/2013\/06\/18\/basic-application-for-linux-iptables-firewall-tutorial\/","title":{"rendered":"Linux\u4e0aiptables\u9632\u706b\u5899\u7684\u57fa\u672c\u5e94\u7528\u6559\u7a0b"},"content":{"rendered":"

1\u3001\u5b89\u88c5iptables\u9632\u706b\u5899<\/span><\/p>\n

\u5982\u679c\u6ca1\u6709\u5b89\u88c5iptables\u9700\u8981\u5148\u5b89\u88c5\uff0cCentOS\u6267\u884c\uff1a<\/p>\n

yum install iptables<\/p>\n

Debian\/Ubuntu\u6267\u884c\uff1a<\/p>\n

apt-get install iptables<\/p>\n

2\u3001\u6e05\u9664\u5df2\u6709iptables\u89c4\u5219<\/span><\/p>\n

iptables -F<\/p>\n

iptables -X<\/p>\n

iptables -Z<\/p>\n

3\u3001\u5f00\u653e\u6307\u5b9a\u7684\u7aef\u53e3<\/span><\/p>\n

<\/p>\n

\u00a0#\u5141\u8bb8\u672c\u5730\u56de\u73af\u63a5\u53e3(\u5373\u8fd0\u884c\u672c\u673a\u8bbf\u95ee\u672c\u673a)<\/p>\n

iptables -A INPUT -s 127.0.0.1 -d 127.0.0.1 -j ACCEPT<\/p>\n

# \u5141\u8bb8\u5df2\u5efa\u7acb\u7684\u6216\u76f8\u5173\u8fde\u7684\u901a\u884c<\/p>\n

iptables -A INPUT -m state –state ESTABLISHED,RELATED -j ACCEPT<\/p>\n

#\u5141\u8bb8\u6240\u6709\u672c\u673a\u5411\u5916\u7684\u8bbf\u95ee<\/p>\n

iptables -A OUTPUT -j ACCEPT<\/p>\n

# \u5141\u8bb8\u8bbf\u95ee22\u7aef\u53e3<\/p>\n

iptables -A INPUT -p tcp –dport 22 -j ACCEPT<\/p>\n

#\u5141\u8bb8\u8bbf\u95ee80\u7aef\u53e3<\/p>\n

iptables -A INPUT -p tcp –dport 80 -j ACCEPT<\/p>\n

#\u5141\u8bb8FTP\u670d\u52a1\u768421\u548c20\u7aef\u53e3<\/p>\n

iptables -A INPUT -p tcp –dport 21 -j ACCEPT<\/p>\n

iptables -A INPUT -p tcp –dport 20 -j ACCEPT<\/p>\n

#\u5982\u679c\u6709\u5176\u4ed6\u7aef\u53e3\u7684\u8bdd\uff0c\u89c4\u5219\u4e5f\u7c7b\u4f3c\uff0c\u7a0d\u5fae\u4fee\u6539\u4e0a\u8ff0\u8bed\u53e5\u5c31\u884c<\/p>\n

#\u7981\u6b62\u5176\u4ed6\u672a\u5141\u8bb8\u7684\u89c4\u5219\u8bbf\u95ee<\/p>\n

iptables -A INPUT -j REJECT\u00a0 \uff08\u6ce8\u610f\uff1a\u5982\u679c22\u7aef\u53e3\u672a\u52a0\u5165\u5141\u8bb8\u89c4\u5219\uff0cSSH\u94fe\u63a5\u4f1a\u76f4\u63a5\u65ad\u5f00\u3002\uff09<\/p>\n

iptables -A FORWARD -j REJECT<\/p>\n

4\u3001\u5c4f\u853dIP<\/span><\/p>\n

\u00a0#\u5982\u679c\u53ea\u662f\u60f3\u5c4f\u853dIP\u7684\u8bdd\u201c3\u3001\u5f00\u653e\u6307\u5b9a\u7684\u7aef\u53e3\u201d\u53ef\u4ee5\u76f4\u63a5\u8df3\u8fc7\u3002<\/p>\n

#\u5c4f\u853d\u5355\u4e2aIP\u7684\u547d\u4ee4\u662f<\/p>\n

iptables -I INPUT -s 123.45.6.7 -j DROP<\/p>\n

#\u5c01\u6574\u4e2a\u6bb5\u5373\u4ece123.0.0.1\u5230123.255.255.254\u7684\u547d\u4ee4<\/p>\n

iptables -I INPUT -s 123.0.0.0\/8 -j DROP<\/p>\n

#\u5c01IP\u6bb5\u5373\u4ece123.45.0.1\u5230123.45.255.254\u7684\u547d\u4ee4<\/p>\n

iptables -I INPUT -s 124.45.0.0\/16 -j DROP<\/p>\n

#\u5c01IP\u6bb5\u5373\u4ece123.45.6.1\u5230123.45.6.254\u7684\u547d\u4ee4\u662f<\/p>\n

iptables -I INPUT -s 123.45.6.0\/24 -j DROP<\/p>\n

4\u3001\u67e5\u770b\u5df2\u6dfb\u52a0\u7684iptables\u89c4\u5219<\/span><\/p>\n

iptables -L -n<\/p>\n

v\uff1a\u663e\u793a\u8be6\u7ec6\u4fe1\u606f\uff0c\u5305\u62ec\u6bcf\u6761\u89c4\u5219\u7684\u5339\u914d\u5305\u6570\u91cf\u548c\u5339\u914d\u5b57\u8282\u6570<\/p>\n

x\uff1a\u5728 v \u7684\u57fa\u7840\u4e0a\uff0c\u7981\u6b62\u81ea\u52a8\u5355\u4f4d\u6362\u7b97\uff08K\u3001M\uff09 vps\u4fa6\u63a2<\/p>\n

n\uff1a\u53ea\u663e\u793aIP\u5730\u5740\u548c\u7aef\u53e3\u53f7\uff0c\u4e0d\u5c06ip\u89e3\u6790\u4e3a\u57df\u540d<\/p>\n

\u00a05\u3001\u5220\u9664\u5df2\u6dfb\u52a0\u7684iptables\u89c4\u5219<\/span><\/p>\n

\u00a0\u5c06\u6240\u6709iptables\u4ee5\u5e8f\u53f7\u6807\u8bb0\u663e\u793a\uff0c\u6267\u884c\uff1a<\/p>\n

iptables -L -n –line-numbers<\/p>\n

\u6bd4\u5982\u8981\u5220\u9664INPUT\u91cc\u5e8f\u53f7\u4e3a8\u7684\u89c4\u5219\uff0c\u6267\u884c\uff1a<\/p>\n

\u00a0iptables -D INPUT 8<\/p>\n

6\u3001iptables\u7684\u5f00\u673a\u542f\u52a8\u53ca\u89c4\u5219\u4fdd\u5b58<\/span><\/p>\n

CentOS\u4e0a\u53ef\u80fd\u4f1a\u5b58\u5728\u5b89\u88c5\u597diptables\u540e\uff0ciptables\u5e76\u4e0d\u5f00\u673a\u81ea\u542f\u52a8\uff0c\u53ef\u4ee5\u6267\u884c\u4e00\u4e0b\uff1a<\/p>\n

chkconfig –level 345 iptables on<\/p>\n

\u5c06\u5176\u52a0\u5165\u5f00\u673a\u542f\u52a8\u3002<\/p>\n

CentOS\u4e0a\u53ef\u4ee5\u6267\u884c\uff1aservice iptables save\u4fdd\u5b58\u89c4\u5219\u3002<\/p>\n

\u53e6\u5916\u66f4\u9700\u8981\u6ce8\u610f\u7684\u662fDebian\/Ubuntu\u4e0aiptables\u662f\u4e0d\u4f1a\u4fdd\u5b58\u89c4\u5219\u7684\u3002<\/p>\n

\u9700\u8981\u6309\u5982\u4e0b\u6b65\u9aa4\u8fdb\u884c\uff0c\u8ba9\u7f51\u5361\u5173\u95ed\u662f\u4fdd\u5b58iptables\u89c4\u5219\uff0c\u542f\u52a8\u65f6\u52a0\u8f7diptables\u89c4\u5219\uff1a<\/p>\n

\u521b\u5efa\/etc\/network\/if-post-down.d\/iptables \u6587\u4ef6\uff0c\u6dfb\u52a0\u5982\u4e0b\u5185\u5bb9\uff1a<\/p>\n

#!\/bin\/bash<\/p>\n

iptables-save > \/etc\/iptables.rules<\/p>\n

\u6267\u884c\uff1achmod +x \/etc\/network\/if-post-down.d\/iptables \u6dfb\u52a0\u6267\u884c\u6743\u9650\u3002<\/p>\n

\u521b\u5efa\/etc\/network\/if-pre-up.d\/iptables \u6587\u4ef6\uff0c\u6dfb\u52a0\u5982\u4e0b\u5185\u5bb9\uff1a<\/p>\n

#!\/bin\/bash<\/p>\n

iptables-restore < \/etc\/iptables.rules<\/p>\n

\u6267\u884c\uff1achmod +x \/etc\/network\/if-pre-up.d\/iptables \u6dfb\u52a0\u6267\u884c\u6743\u9650\u3002<\/p>\n

\u5173\u4e8e\u66f4\u591a\u7684iptables\u7684\u4f7f\u7528\u65b9\u6cd5\u53ef\u4ee5\u6267\u884c\uff1aiptables –help\u6216\u7f51\u4e0a\u641c\u7d22\u4e00\u4e0biptables\u53c2\u6570\u7684\u8bf4\u660e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

1\u3001\u5b89\u88c5iptables\u9632\u706b\u5899 \u5982\u679c\u6ca1\u6709\u5b89\u88c5iptables\u9700\u8981\u5148\u5b89\u88c5\uff0cCentOS\u6267\u884c\uff1a yum insta … \u7ee7\u7eed\u9605\u8bfbLinux\u4e0aiptables\u9632\u706b\u5899\u7684\u57fa\u672c\u5e94\u7528\u6559\u7a0b<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[48],"class_list":["post-303","post","type-post","status-publish","format-standard","hentry","category-tech","tag-iptables"],"_links":{"self":[{"href":"https:\/\/www.lnlog.cn\/index.php\/wp-json\/wp\/v2\/posts\/303","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lnlog.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lnlog.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lnlog.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lnlog.cn\/index.php\/wp-json\/wp\/v2\/comments?post=303"}],"version-history":[{"count":0,"href":"https:\/\/www.lnlog.cn\/index.php\/wp-json\/wp\/v2\/posts\/303\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.lnlog.cn\/index.php\/wp-json\/wp\/v2\/media?parent=303"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lnlog.cn\/index.php\/wp-json\/wp\/v2\/categories?post=303"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lnlog.cn\/index.php\/wp-json\/wp\/v2\/tags?post=303"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}