{"id":203,"date":"2012-04-12T17:00:02","date_gmt":"2012-04-12T09:00:02","guid":{"rendered":"http:\/\/www.ipcpu.com\/?p=203"},"modified":"2012-04-12T17:00:02","modified_gmt":"2012-04-12T09:00:02","slug":"linux-iptables-drop-packets","status":"publish","type":"post","link":"https:\/\/c.ipcpu.com\/2012\/04\/linux-iptables-drop-packets\/","title":{"rendered":"\u5982\u4f55\u67e5\u770b\u88abiptables\u4e22\u5f03\u7684\u6570\u636e\u5305"},"content":{"rendered":"<p>\u5728Linux\u7cfb\u7edf\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u7528iptables\u5bf9\u6570\u636e\u5305\u8fdb\u884c\u9650\u5236\uff0c\u6700\u5e38\u89c1\u7684\u5c31\u6bd4\u5982\uff1a<br \/>\n[root@s109 ~]#iptables -nvL<br \/>\nChain INPUT (policy DROP 830 packets, 176K bytes)<br \/>\npkts bytes target\u00a0\u00a0\u00a0\u00a0 prot opt in\u00a0\u00a0\u00a0\u00a0 out\u00a0\u00a0\u00a0\u00a0 source\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 destination<br \/>\n4954 2547K ACCEPT\u00a0\u00a0\u00a0\u00a0 all\u00a0 --\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 state RELATED,ESTABLISHED<br \/>\n77\u00a0 4536 ACCEPT\u00a0\u00a0\u00a0\u00a0 all\u00a0 --\u00a0 lo\u00a0\u00a0\u00a0\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0<br \/>\n3\u00a0\u00a0 132 ACCEPT\u00a0\u00a0\u00a0\u00a0 tcp\u00a0 --\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 10.0.0.0\/8\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 tcp dpt:22 state NEW<br \/>\n0\u00a0\u00a0\u00a0\u00a0 0 DROP\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 tcp\u00a0 --\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 tcp dpt:22 state NEW<br \/>\n10012\u00a0 736K ACCEPT\u00a0\u00a0\u00a0\u00a0 icmp --\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 limit: avg 3\/sec burst 5<br \/>\n46\u00a0 2024 ACCEPT\u00a0\u00a0\u00a0\u00a0 tcp\u00a0 --\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 tcp dpt:80<br \/>\n0\u00a0\u00a0\u00a0\u00a0 0 ACCEPT\u00a0\u00a0\u00a0\u00a0 all\u00a0 --\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 224.0.0.18<br \/>\n736 63525 ACCEPT\u00a0\u00a0\u00a0\u00a0 udp\u00a0 --\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 10.0.0.0\/8\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 udp dpt:161<br \/>\n\u8fd9\u91cc\u53ea\u5199\u4e86\u4e00\u90e8\u5206\uff0c\u5728INPUT\u94fe\u4e2d\u9ed8\u8ba4\u89c4\u5219\u662fDROP,\u6240\u6709\u6ca1\u6709\u5339\u914d\u5230\u5217\u8868\u7684\u6570\u636e\u5305\u4f1a\u88ab\u4e22\u5f03\u3002<br \/>\n\u4f46\u662f\u6709\u65f6\u6211\u4eec\u60f3\u770b\u4e00\u4e0b\u88abiptables\u4e22\u5f03\u7684\u6570\u636e\u5305\uff0c\u6bd4\u5982\u4ee5\u524d\u6ca1\u6709\u5f00\u542fiptables\uff0c\u5f00\u542fiptables\u6709\u53ef\u80fd\u4f1a\u4e22\u5f03\u6b63\u5e38\u7684\u6570\u636e\u5305\u3002<br \/>\n\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528iptables\u4e2d\u7684LOG\u52a8\u4f5c\u6765\u5bf9\u8fd9\u4e9b\u6570\u636e\u8fdb\u884c\u8bb0\u5f55\u3002<br \/>\n\u6700\u7b80\u5355\u7684\u4f7f\u7528\u529e\u6cd5<br \/>\niptables -A INPUT -j LOG \u2013log-prefix=\u201diptables-\u201d<br \/>\n\u8fd9\u6837\u6211\u4eec\u5c31\u53ef\u4ee5\u628a\u5339\u914d\u4e0aiptables\u89c4\u5219\u7684\u6570\u636e\u5305\u5199\u5230syslog\u4e2d\u3002<br \/>\n\u56e0\u4e3aiptables\u662f\u6309\u7167\u81ea\u4e0a\u800c\u4e0b\u7684\u987a\u5e8f\u5bf9\u6570\u636e\u5305\u8fdb\u884c\u5339\u914d\uff0c\u6240\u4ee5\u5728\u6700\u5e95\u4e0b\u6dfb\u52a0LOG\u8bb0\u5f55\uff0c\u4e5f\u5c31\u662f\u8bb0\u5f55\u4e86\u6267\u884c\u9ed8\u8ba4\u89c4\u5219\u7684\u6570\u636e\u5305\u3002<br \/>\n\u6211\u4eec\u6765\u770b\u4e00\u4e0bsyslog:<br \/>\nApr 10 17:45:54 S109 kernel: iptables-IN=eth1 OUT= MAC=ff:ff:ff:ff:ff:ff:52:54:00:02:12:a8:08:00 SRC=0.0.0.0 DST=255.255.255.255 LEN=330 TOS=0x00 PREC=0x00 TTL=128 ID=4225 PROTO=UDP SPT=68 DPT=67 LEN=310<br \/>\nApr 10 17:46:03 S109 kernel: iptables-IN=eth1 OUT= MAC=ff:ff:ff:ff:ff:ff:52:54:00:02:12:a8:08:00 SRC=0.0.0.0 DST=255.255.255.255 LEN=330 TOS=0x00 PREC=0x00 TTL=128 ID=4226 PROTO=UDP SPT=68 DPT=67 LEN=310<br \/>\nApr 10 17:46:09 S109 kernel: iptables-IN=eth1 OUT= MAC=78:2b:cb:42:a7:2f:3c:e5:a6:4d:59:00:08:00 SRC=184.173.144.34 DST=113.31.131.27 LEN=72 TOS=0x00 PREC=0x00 TTL=44 ID=29448 DF PROTO=UDP SPT=53 DPT=11437 LEN=52<br \/>\nApr 10 17:46:16 S109 kernel: iptables-IN=eth1 OUT= MAC=78:2b:cb:42:a7:2f:3c:e5:a6:4d:59:00:08:00 SRC=184.173.144.34 DST=113.31.131.27 LEN=72 TOS=0x00 PREC=0x00 TTL=44 ID=30057 DF PROTO=UDP SPT=53 DPT=11826 LEN=52<br \/>\n\u6e90MAC\u3001\u76ee\u7684MAC\u3001\u6e90IP\u3001\u76ee\u7684IP\u3001\u6e90\u7aef\u53e3\u3001\u76ee\u7684\u7aef\u53e3\u90fd\u88ab\u8bb0\u5f55\u5230\u4e86syslog\u3002<br \/>\n\u901a\u8fc7\u5206\u6790\u8fd9\u4e9b\u65e5\u5fd7\uff0c\u53ef\u4ee5\u627e\u51fa\u662f\u5426\u9519\u8bef\u7684\u62d2\u7edd\u4e86\u6570\u636e\u5305\u3002<\/p>\n<p>\u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff1a<a href=\"https:\/\/c.ipcpu.com\">IPCPU-\u7f51\u7edc\u4e4b\u8def<\/a> &raquo; <a href=\"https:\/\/c.ipcpu.com\/2012\/04\/linux-iptables-drop-packets\/\">\u5982\u4f55\u67e5\u770b\u88abiptables\u4e22\u5f03\u7684\u6570\u636e\u5305<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>\u5728Linux\u7cfb\u7edf\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u7528iptables\u5bf9\u6570\u636e\u5305\u8fdb\u884c\u9650\u5236\uff0c\u6700\u5e38\u89c1\u7684\u5c31\u6bd4\u5982\uff1a [root@s109 ~]#iptables -nvL Chain INPUT (policy DROP 830 packets, 176K bytes) pkts bytes target\u00a0\u00a0\u00a0\u00a0 prot opt in\u00a0\u00a0\u00a0\u00a0 out\u00a0\u00a0\u00a0\u00a0 source\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 destination 4954 2547K ACCEPT\u00a0\u00a0\u00a0\u00a0 all\u00a0 &#8212;\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 state RELATED,ESTABLISHED 77\u00a0 4536 ACCEPT\u00a0\u00a0\u00a0\u00a0 all\u00a0 &#8212;\u00a0 lo\u00a0\u00a0\u00a0\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0 3\u00a0\u00a0 132 ACCEPT\u00a0\u00a0\u00a0\u00a0 tcp\u00a0 &#8212;\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 10.0.0.0\/8\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0.0.0.0\/0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 tcp dpt:22 state NEW 0\u00a0\u00a0\u00a0\u00a0 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[13],"tags":[],"_links":{"self":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/posts\/203"}],"collection":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/comments?post=203"}],"version-history":[{"count":0,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/posts\/203\/revisions"}],"wp:attachment":[{"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/media?parent=203"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/categories?post=203"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/c.ipcpu.com\/wp-json\/wp\/v2\/tags?post=203"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}