{"id":14684,"date":"2024-02-04T14:10:03","date_gmt":"2024-02-04T10:40:03","guid":{"rendered":"https:\/\/www.itpiran.net\/blog\/?p=14684"},"modified":"2024-02-04T14:10:03","modified_gmt":"2024-02-04T10:40:03","slug":"how-to-list-and-delete-iptables-firewall-rules","status":"publish","type":"post","link":"https:\/\/www.itpiran.net\/blog\/zh\/tutorials\/how-to-list-and-delete-iptables-firewall-rules\/","title":{"rendered":"\u5982\u4f55\u5217\u51fa\u548c\u5220\u9664 iptables \u9632\u706b\u5899\u89c4\u5219"},"content":{"rendered":"<h2 id=\"%d9%85%d9%82%d8%af%d9%85%d9%87\">\u4ecb\u7ecd<\/h2>\n<p>iptables \u662f\u4e00\u6b3e\u9632\u706b\u5899\uff0c\u5728\u5927\u591a\u6570 Linux \u7cfb\u7edf\u7684\u7f51\u7edc\u5b89\u5168\u4e2d\u626e\u6f14\u7740\u81f3\u5173\u91cd\u8981\u7684\u89d2\u8272\u3002\u867d\u7136\u8bb8\u591a iptables \u6559\u7a0b\u90fd\u6559\u4f60\u5982\u4f55\u521b\u5efa\u9632\u706b\u5899\u89c4\u5219\u6765\u4fdd\u62a4\u670d\u52a1\u5668\uff0c\u4f46\u672c\u6587\u5219\u4fa7\u91cd\u4e8e\u9632\u706b\u5899\u7ba1\u7406\u7684\u53e6\u4e00\u4e2a\u65b9\u9762\uff1a\u89c4\u5219\u7684\u5217\u51fa\u548c\u5220\u9664\u3002.<\/p>\n<p>\u672c\u6559\u7a0b\u5c06\u4ecb\u7ecd\u5982\u4f55\u6267\u884c\u4ee5\u4e0b iptables \u4efb\u52a1\uff1a<\/p>\n<ul>\n<li>\u5217\u51fa\u89c4\u5219<\/li>\n<li>\u6e05\u9664\u6570\u636e\u5305\u548c\u5b57\u8282\u8ba1\u6570\u5668<\/li>\n<li>\u5220\u9664\u89c4\u5219<\/li>\n<li>\u6e05\u9664\u94fe\uff08\u5220\u9664\u94fe\u4e2d\u7684\u6240\u6709\u89c4\u5219\uff09<\/li>\n<li>\u6e05\u9664\u6240\u6709\u94fe\u548c\u8868\uff0c\u79fb\u9664\u6240\u6709\u94fe\uff0c\u5e76\u63a5\u53d7\u6240\u6709\u6d41\u91cf<\/li>\n<\/ul>\n<h5 id=\"%d9%be%db%8c%d8%b4-%d9%86%db%8c%d8%a7%d8%b2%d9%87%d8%a7\">\u5148\u51b3\u6761\u4ef6<\/h5>\n<p>\u672c\u6559\u7a0b\u5047\u8bbe\u60a8\u4f7f\u7528\u7684\u662f\u5df2\u5b89\u88c5 iptables \u547d\u4ee4\u7684 Linux \u670d\u52a1\u5668\uff0c\u5e76\u4e14\u60a8\u7684\u7528\u6237\u62e5\u6709 sudo \u6743\u9650\u3002\u5982\u679c\u60a8\u5728\u521d\u59cb\u8bbe\u7f6e\u65b9\u9762\u9700\u8981\u5e2e\u52a9\uff0c\u8bf7\u53c2\u9605 Ubuntu 20.04 \u670d\u52a1\u5668\u521d\u59cb\u8bbe\u7f6e\u6307\u5357\u3002.<\/p>\n<h2 id=\"%d9%81%d9%87%d8%b1%d8%b3%d8%aa-%d8%a8%d9%86%d8%af%db%8c-%d9%82%d9%88%d8%a7%d9%86%db%8c%d9%86-%d8%a8%d8%b1-%d8%a7%d8%b3%d8%a7%d8%b3-%d9%85%d8%b4%d8%ae%d8%b5%d8%a7%d8%aa\">\u6309\u89c4\u683c\u5217\u51fa\u89c4\u5219<\/h2>\n<p>\u6211\u4eec\u5148\u6765\u770b\u770b\u5982\u4f55\u5217\u51fa\u89c4\u5219\u3002\u67e5\u770b\u5df2\u6fc0\u6d3b\u7684 iptables \u89c4\u5219\u6709\u4e24\u79cd\u4e0d\u540c\u7684\u65b9\u5f0f\uff1a\u4ee5\u8868\u683c\u5f62\u5f0f\u6216\u4ee5\u89c4\u5219\u89c4\u8303\u5217\u8868\u5f62\u5f0f\u3002\u4e24\u79cd\u65b9\u6cd5\u63d0\u4f9b\u7684\u4fe1\u606f\u5927\u81f4\u76f8\u540c\uff0c\u53ea\u662f\u683c\u5f0f\u4e0d\u540c\u3002.<\/p>\n<p>\u8981\u6309\u89c4\u8303\u5217\u51fa\u6240\u6709\u6d3b\u52a8\u7684 iptables \u89c4\u5219\uff0c\u8bf7\u8fd0\u884c\u5e26\u6709 -S \u9009\u9879\u7684 iptables \u547d\u4ee4\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo iptables -S<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>Output\r\n-P INPUT DROP\r\n-P FORWARD DROP\r\n-P OUTPUT ACCEPT\r\n-N ICMP\r\n-N TCP\r\n-N UDP\r\n-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT\r\n-A INPUT -i lo -j ACCEPT\r\n-A INPUT -m conntrack --ctstate INVALID -j DROP\r\n-A INPUT -p udp -m conntrack --ctstate NEW -j UDP\r\n-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -m conntrack --ctstate NEW -j TCP\r\n-A INPUT -p icmp -m conntrack --ctstate NEW -j ICMP\r\n-A INPUT -p udp -j REJECT --reject-with icmp-port-unreachable\r\n-A INPUT -p tcp -j REJECT --reject-with tcp-reset\r\n-A INPUT -j REJECT --reject-with icmp-proto-unreachable\r\n-A TCP -p tcp -m tcp --dport 22 -j ACCEPT\r\n...<\/code><\/pre>\n<\/div>\n<p>\u5982\u60a8\u6240\u89c1\uff0c\u8f93\u51fa\u7ed3\u679c\u4e0e\u521b\u5efa\u8fd9\u4e9b\u89c4\u5219\u65f6\u4f7f\u7528\u7684\u547d\u4ee4\u5b8c\u5168\u76f8\u540c\uff0c\u53ea\u662f\u7701\u7565\u4e86\u4e4b\u524d\u7684 iptables \u547d\u4ee4\u3002\u5982\u679c\u60a8\u66fe\u7ecf\u4f7f\u7528\u8fc7 iptables-persistent \u6216 iptables save \u547d\u4ee4\uff0c\u90a3\u4e48\u8fd9\u4e0e iptables \u89c4\u5219\u914d\u7f6e\u6587\u4ef6\u7684\u914d\u7f6e\u65b9\u5f0f\u4e5f\u7c7b\u4f3c\u3002.<\/p>\n<h2 id=\"%d9%81%d9%87%d8%b1%d8%b3%d8%aa-%da%a9%d8%b1%d8%af%d9%86-%db%8c%da%a9-%d8%b2%d9%86%d8%ac%db%8c%d8%b1%d9%87-%d8%ae%d8%a7%d8%b5\">\u5217\u51fa\u7279\u5b9a\u94fe\u6761<\/h2>\n<p>\u5982\u679c\u8981\u5c06\u8f93\u51fa\u9650\u5236\u4e3a\u7279\u5b9a\u94fe\uff08INPUT\u3001OUTPUT\u3001TCP \u7b49\uff09\uff0c\u53ef\u4ee5\u5728\u9009\u9879\u540e\u76f4\u63a5\u6307\u5b9a\u94fe\u540d\u79f0\u3002 <code>-S<\/code> \u4f8b\u5982\uff0c\u8981\u663e\u793a TCP \u94fe\u4e2d\u7684\u6240\u6709\u89c4\u5219\uff0c\u8bf7\u8fd0\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo iptables -S TCP<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>Output\r\n-N TCP\r\n-A TCP -p tcp -m tcp --dport 22 -j ACCEPT<\/code><\/pre>\n<\/div>\n<p>\u73b0\u5728\u8ba9\u6211\u4eec\u6765\u770b\u53e6\u4e00\u79cd\u67e5\u770b\u6d3b\u52a8 iptables \u89c4\u5219\u7684\u65b9\u6cd5\uff0c\u5373\u4ee5\u89c4\u5219\u8868\u7684\u5f62\u5f0f\u67e5\u770b\u3002.<\/p>\n<h2 id=\"%d9%81%d9%87%d8%b1%d8%b3%d8%aa-%da%a9%d8%b1%d8%af%d9%86-%d9%82%d9%88%d8%a7%d9%86%db%8c%d9%86-%d8%a8%d9%87-%d8%b5%d9%88%d8%b1%d8%aa-%d8%ac%d8%af%d8%a7%d9%88%d9%84\">\u8868\u683c\u4e2d\u7684\u89c4\u5219\u5217\u8868<\/h2>\n<p>\u4ee5\u8868\u683c\u5f62\u5f0f\u5217\u51fa iptables \u89c4\u5219\u6709\u52a9\u4e8e\u6bd4\u8f83\u4e0d\u540c\u89c4\u5219\u3002\u8981\u4ee5\u8868\u683c\u5f62\u5f0f\u8f93\u51fa\u6240\u6709\u6d3b\u52a8\u7684 iptables \u89c4\u5219\uff0c\u8bf7\u8fd0\u884c\u5e26\u6709 -L \u9009\u9879\u7684 iptables \u547d\u4ee4\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo iptables -L<\/code><\/pre>\n<\/div>\n<p>\u8fd9\u5c06\u751f\u6210\u6240\u6709\u5f53\u524d\u89c4\u5219\uff0c\u5e76\u6309\u94fe\u8fdb\u884c\u6392\u5e8f\u3002.<\/p>\n<p>\u5982\u679c\u8981\u5c06\u8f93\u51fa\u9650\u5236\u4e3a\u7279\u5b9a\u94fe\uff08INPUT\u3001OUTPUT\u3001TCP \u7b49\uff09\uff0c\u53ef\u4ee5\u5728 -L \u9009\u9879\u540e\u76f4\u63a5\u6307\u5b9a\u94fe\u540d\u79f0\u3002.<\/p>\n<p>\u6211\u4eec\u6765\u770b\u4e00\u4e2a\u8f93\u5165\u94fe\u7684\u4f8b\u5b50\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo iptables -L INPUT<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>Output\r\nChain INPUT (policy DROP)\r\ntarget prot opt source destination\r\nACCEPT all -- anywhere anywhere ctstate RELATED,ESTABLISHED\r\nACCEPT all -- anywhere anywhere\r\nDROP all -- anywhere anywhere ctstate INVALID\r\nUDP udp -- anywhere anywhere ctstate NEW\r\nTCP tcp -- anywhere anywhere tcp flags:FIN,SYN,RST,ACK\/SYN ctstate NEW\r\nICMP icmp -- anywhere anywhere ctstate NEW\r\nREJECT udp -- anywhere anywhere reject-with icmp-port-unreachable\r\nREJECT tcp -- anywhere anywhere reject-with tcp-reset\r\nREJECT all -- anywhere anywhere reject-with icmp-proto-unreachable<\/code><\/pre>\n<\/div>\n<p>\u8f93\u51fa\u7684\u7b2c\u4e00\u884c\u663e\u793a\u94fe\u7684\u540d\u79f0\uff08\u672c\u4f8b\u4e2d\u4e3a INPUT\uff09\uff0c\u540e\u8ddf\u5176\u9ed8\u8ba4\u7b56\u7565\uff08DROP\uff09\u3002\u4e0b\u4e00\u884c\u5305\u542b\u8868\u4e2d\u6bcf\u4e00\u5217\u7684\u6807\u9898\uff0c\u4ee5\u53ca\u94fe\u89c4\u5219\u3002\u8ba9\u6211\u4eec\u56de\u987e\u4e00\u4e0b\u6bcf\u4e2a\u6807\u9898\u7684\u542b\u4e49\uff1a<\/p>\n<ul>\n<li>\u76ee\u6807\uff1a\u5982\u679c\u6570\u636e\u5305\u7b26\u5408\u67d0\u6761\u89c4\u5219\uff0c\u76ee\u6807\u5c06\u6307\u5b9a\u5982\u4f55\u5904\u7406\u8be5\u6570\u636e\u5305\u3002\u4f8b\u5982\uff0c\u6570\u636e\u5305\u53ef\u4ee5\u88ab\u63a5\u53d7\u3001\u4e22\u5f03\u3001\u8bb0\u5f55\uff0c\u6216\u8005\u53d1\u9001\u5230\u53e6\u4e00\u4e2a\u94fe\u4ee5\u4e0e\u66f4\u591a\u89c4\u5219\u8fdb\u884c\u6bd4\u8f83\u3002.<\/li>\n<li>prot\uff1a\u534f\u8bae\uff0c\u4f8b\u5982 TCP\u3001UDP\u3001ICMP \u6216 all<\/li>\n<li>\u9009\u9879\uff1a\u6b64\u5217\u5f88\u5c11\u4f7f\u7528\uff0c\u663e\u793a IP \u9009\u9879<\/li>\n<li>\u6765\u6e90\uff1a\u6d41\u91cf\u7684\u6e90 IP \u5730\u5740\u6216\u5b50\u7f51\uff0c\u6216\u4efb\u4f55\u4f4d\u7f6e<\/li>\n<li>\u76ee\u6807\u5730\u5740\uff1a\u6d41\u91cf\u7684\u76ee\u6807 IP \u5730\u5740\u6216\u5b50\u7f51\uff0c\u6216\u4efb\u4f55\u4f4d\u7f6e<\/li>\n<\/ul>\n<p>\u6700\u540e\u4e00\u5217\uff08\u672a\u6807\u6ce8\uff09\u663e\u793a\u89c4\u5219\u7684\u9009\u9879\u3002\u8fd9\u90e8\u5206\u5305\u542b\u89c4\u5219\u4e2d\u672a\u5728\u524d\u9762\u51e0\u5217\u4e2d\u663e\u793a\u7684\u4efb\u4f55\u5185\u5bb9\uff0c\u4f8b\u5982\u6e90\u7aef\u53e3\u548c\u76ee\u6807\u7aef\u53e3\uff0c\u4ee5\u53ca\u6570\u636e\u5305\u8fde\u63a5\u7684\u72b6\u6001\u7b49\u7b49\u3002.<\/p>\n<h2 id=\"%d9%86%d9%85%d8%a7%db%8c%d8%b4-%d8%aa%d8%b9%d8%af%d8%a7%d8%af-%d8%a8%d8%b3%d8%aa%d9%87-%d9%87%d8%a7-%d9%88-%d8%a7%d9%86%d8%af%d8%a7%d8%b2%d9%87-%da%a9%d9%84\">\u663e\u793a\u5305\u88f9\u6570\u91cf\u548c\u603b\u5927\u5c0f<\/h2>\n<p>\u5217\u51fa iptables \u89c4\u5219\u65f6\uff0c\u53ef\u4ee5\u663e\u793a\u5339\u914d\u6bcf\u6761\u89c4\u5219\u7684\u6570\u636e\u5305\u6570\u91cf\u548c\u6570\u636e\u5305\u603b\u5927\u5c0f\uff08\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\uff09\u3002\u8fd9\u5728\u60f3\u8981\u5927\u81f4\u4e86\u89e3\u54ea\u4e9b\u89c4\u5219\u5339\u914d\u54ea\u4e9b\u6570\u636e\u5305\u65f6\u975e\u5e38\u6709\u7528\u3002\u8981\u5b9e\u73b0\u8fd9\u4e00\u70b9\uff0c\u8bf7\u540c\u65f6\u4f7f\u7528 -L \u548c -v \u9009\u9879\u3002.<\/p>\n<p>\u4f8b\u5982\uff0c\u8ba9\u6211\u4eec\u518d\u6b21\u4f7f\u7528 -v \u9009\u9879\u6765\u770b\u4e00\u4e0b INPUT \u94fe\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo iptables -L INPUT -v<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>Output\r\nChain INPUT (policy DROP 0 packets, 0 bytes)\r\npkts bytes target prot opt in out source destination\r\n284K 42M ACCEPT all -- any any anywhere anywhere ctstate RELATED,ESTABLISHED\r\n0 0 ACCEPT all -- lo any anywhere anywhere\r\n0 0 DROP all -- any any anywhere anywhere ctstate INVALID\r\n396 63275 UDP udp -- any any anywhere anywhere ctstate NEW\r\n17067 1005K TCP tcp -- any any anywhere anywhere tcp flags:FIN,SYN,RST,ACK\/SYN ctstate NEW\r\n2410 154K ICMP icmp -- any any anywhere anywhere ctstate NEW\r\n396 63275 REJECT udp -- any any anywhere anywhere reject-with icmp-port-unreachable\r\n2916 179K REJECT all -- any any anywhere anywhere reject-with icmp-proto-unreachable\r\n0 0 ACCEPT tcp -- any any anywhere anywhere tcp dpt:ssh ctstate NEW,ESTABLISHED<\/code><\/pre>\n<\/div>\n<p>\u8bf7\u6ce8\u610f\uff0c\u5217\u8868\u73b0\u5728\u591a\u4e86\u4e24\u5217\uff0c <code>\u5305<\/code> \u548c <code>\u5b57\u8282<\/code> \u8fd9\u662f\u3002.<\/p>\n<p>\u65e2\u7136\u60a8\u5df2\u7ecf\u77e5\u9053\u5982\u4f55\u4ee5\u4e0d\u540c\u7684\u65b9\u5f0f\u5217\u51fa\u6d3b\u52a8\u7684\u9632\u706b\u5899\u89c4\u5219\uff0c\u90a3\u4e48\u8ba9\u6211\u4eec\u770b\u770b\u5982\u4f55\u91cd\u7f6e\u6570\u636e\u5305\u548c\u5b57\u8282\u8ba1\u6570\u5668\u3002.<\/p>\n<h2 id=\"%d8%aa%d9%86%d8%b8%db%8c%d9%85-%d9%85%d8%ac%d8%af%d8%af-%d8%aa%d8%b9%d8%af%d8%a7%d8%af-%d8%a8%d8%b3%d8%aa%d9%87-%d9%87%d8%a7-%d9%88-%d8%a7%d9%86%d8%af%d8%a7%d8%b2%d9%87-%da%a9%d9%84\">\u91cd\u7f6e\u6570\u636e\u5305\u6570\u91cf\u548c\u603b\u5927\u5c0f<\/h2>\n<p>\u5982\u679c\u60a8\u60f3\u6e05\u9664\u6216\u6e05\u96f6\u89c4\u5219\u7684\u6570\u636e\u5305\u548c\u5b57\u8282\u8ba1\u6570\u5668\uff0c\u8bf7\u4f7f\u7528 -Z \u9009\u9879\u3002\u91cd\u542f\u540e\uff0c\u8fd9\u4e9b\u8ba1\u6570\u5668\u4e5f\u4f1a\u91cd\u7f6e\u3002\u5982\u679c\u60a8\u60f3\u67e5\u770b\u670d\u52a1\u5668\u662f\u5426\u63a5\u6536\u5230\u7b26\u5408\u73b0\u6709\u89c4\u5219\u7684\u65b0\u6d41\u91cf\uff0c\u8fd9\u5c06\u975e\u5e38\u6709\u7528\u3002.<\/p>\n<p>\u8981\u6e05\u9664\u6240\u6709\u94fe\u548c\u89c4\u5219\u7684\u8ba1\u6570\u5668\uff0c\u8bf7\u4f7f\u7528\u8be5\u9009\u9879\u3002 <code>-Z<\/code> \u5355\u72ec\u4f7f\u7528\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo iptables -Z<\/code><\/pre>\n<\/div>\n<p>\u8981\u6e05\u9664\u7279\u5b9a\u94fe\u4e2d\u6240\u6709\u89c4\u5219\u7684\u8ba1\u6570\u5668\uff0c\u8bf7\u4f7f\u7528\u8be5\u9009\u9879\u3002 <code>-Z<\/code> \u4f7f\u7528\u5e76\u6307\u5b9a\u94fe\u3002\u4f8b\u5982\uff0c\u8981\u6e05\u9664\u94fe\u8ba1\u6570\u5668\u3002 <code>\u8f93\u5165<\/code> \u8fd0\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo iptables -Z INPUT<\/code><\/pre>\n<\/div>\n<p>\u5982\u679c\u8981\u6e05\u9664\u7279\u5b9a\u89c4\u5219\u7684\u8ba1\u6570\u5668\uff0c\u8bf7\u6307\u5b9a\u94fe\u540d\u79f0\u548c\u89c4\u5219\u7f16\u53f7\u3002\u4f8b\u5982\uff0c\u8981\u6e05\u9664\u94fe\u4e2d\u7b2c\u4e00\u6761\u89c4\u5219\u7684\u8ba1\u6570\u5668\uff0c <code>\u8f93\u5165<\/code>\u8fd0\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo iptables -Z INPUT 1<\/code><\/pre>\n<\/div>\n<p>\u65e2\u7136\u60a8\u5df2\u7ecf\u77e5\u9053\u5982\u4f55\u91cd\u7f6e iptables \u6570\u636e\u5305\u548c\u5b57\u8282\u8ba1\u6570\u5668\uff0c\u90a3\u4e48\u8ba9\u6211\u4eec\u6765\u770b\u770b\u53ef\u4ee5\u7528\u6765\u5220\u9664\u5b83\u4eec\u7684\u4e24\u79cd\u65b9\u6cd5\u3002.<\/p>\n<h2 id=\"%d8%ad%d8%b0%d9%81-%d9%82%d9%88%d8%a7%d9%86%db%8c%d9%86-%d8%a8%d8%b1-%d8%a7%d8%b3%d8%a7%d8%b3-%d9%85%d8%b4%d8%ae%d8%b5%d8%a7%d8%aa\">\u6839\u636e\u89c4\u8303\u5220\u9664\u89c4\u5219<\/h2>\n<p>\u5220\u9664 iptables \u89c4\u5219\u7684\u4e00\u79cd\u65b9\u6cd5\u662f\u6307\u5b9a\u8981\u5220\u9664\u7684\u89c4\u5219\u3002\u4e3a\u6b64\uff0c\u60a8\u53ef\u4ee5\u8fd0\u884c\u5e26\u6709 `-D` \u9009\u9879\u7684 `iptables` \u547d\u4ee4\uff0c\u5e76\u5728\u5176\u540e\u8f93\u5165\u89c4\u5219\u540d\u79f0\u3002\u5982\u679c\u60a8\u60f3\u4f7f\u7528\u6b64\u65b9\u6cd5\u5220\u9664\u89c4\u5219\uff0c\u53ef\u4ee5\u4f7f\u7528 `iptables -S` \u547d\u4ee4\u67e5\u770b\u89c4\u5219\u5217\u8868\u7684\u8f93\u51fa\u4ee5\u83b7\u53d6\u5e2e\u52a9\u3002.<\/p>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u60f3\u5220\u9664\u4e22\u5f03\u65e0\u6548\u8f93\u5165\u6570\u636e\u5305\u7684\u89c4\u5219\uff08-A INPUT -m conntrack \u2013ctstate INVALID -j DROP\uff09\uff0c\u60a8\u53ef\u4ee5\u8fd0\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo iptables -D INPUT -m conntrack --ctstate INVALID -j DROP<\/code><\/pre>\n<\/div>\n<p>\u8bf7\u6ce8\u610f\uff0c\u6b64\u5904\u5e94\u7701\u7565\u7528\u4e8e\u6307\u793a\u89c4\u5219\u5728\u521b\u5efa\u65f6\u7684\u4f4d\u7f6e\u7684 -A \u9009\u9879\u3002.<\/p>\n<h2 id=\"%d8%ad%d8%b0%d9%81-%d9%82%d9%88%d8%a7%d9%86%db%8c%d9%86-%d8%a8%d8%b1-%d8%a7%d8%b3%d8%a7%d8%b3-%d8%b2%d9%86%d8%ac%db%8c%d8%b1%d9%87-%d9%88-%d8%b4%d9%85%d8%a7%d8%b1%d9%87\">\u57fa\u4e8e\u94fe\u548c\u6570\u5b57\u7684\u5220\u9664\u89c4\u5219<\/h2>\n<p>\u53e6\u4e00\u79cd\u5220\u9664 iptables \u89c4\u5219\u7684\u65b9\u6cd5\u662f\u6309\u94fe\u548c\u884c\u53f7\u5220\u9664\u3002\u8981\u6307\u5b9a\u89c4\u5219\u7684\u884c\u53f7\uff0c\u8bf7\u4ee5\u8868\u683c\u5f62\u5f0f\u5217\u51fa\u89c4\u5219\uff0c\u5e76\u6dfb\u52a0 --line-numbers \u9009\u9879\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo iptables -L --line-numbers<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>Output\r\nChain INPUT (policy DROP)\r\nnum target prot opt source destination\r\n1 ACCEPT all -- anywhere anywhere ctstate RELATED,ESTABLISHED\r\n2 ACCEPT all -- anywhere anywhere\r\n3 DROP all -- anywhere anywhere ctstate INVALID\r\n4 UDP udp -- anywhere anywhere ctstate NEW\r\n5 TCP tcp -- anywhere anywhere tcp flags:FIN,SYN,RST,ACK\/SYN ctstate NEW\r\n6 ICMP icmp -- anywhere anywhere ctstate NEW\r\n7 REJECT udp -- anywhere anywhere reject-with icmp-port-unreachable\r\n8 REJECT tcp -- anywhere anywhere reject-with tcp-reset\r\n9 REJECT all -- anywhere anywhere reject-with icmp-proto-unreachable\r\n10 ACCEPT tcp -- anywhere anywhere tcp dpt:ssh ctstate NEW,ESTABLISHED<\/code><\/pre>\n<\/div>\n<p>\u8fd9\u4f1a\u5c06\u884c\u53f7\u6dfb\u52a0\u5230\u4e0e\u6807\u9898\u5173\u8054\u7684\u6bcf\u4e2a\u89c4\u5219\u884c\u4e2d\u3002 <code>\u6570\u5b57<\/code> \u5df2\u663e\u793a\u3002.<\/p>\n<p>\u786e\u5b9a\u8981\u5220\u9664\u7684\u89c4\u5219\u540e\uff0c\u8bb0\u4e0b\u94fe\u53f7\u548c\u89c4\u5219\u884c\u53f7\u3002\u7136\u540e\u8fd0\u884c\u547d\u4ee4 `iptables -D`\uff0c\u540e\u8ddf\u94fe\u53f7\u548c\u89c4\u5219\u884c\u53f7\u3002.<\/p>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u6211\u4eec\u60f3\u8981\u79fb\u9664\u4e22\u5f03\u65e0\u6548\u6570\u636e\u5305\u7684\u5165\u7ad9\u89c4\u5219\uff0c\u6211\u4eec\u4f1a\u53d1\u73b0\u89c4\u5219 3 \u4f4d\u4e8e INPUT \u94fe\u4e2d\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u9700\u8981\u8fd0\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\">sudo iptables -D INPUT 3<\/pre>\n<\/div>\n<p>\u65e2\u7136\u60a8\u5df2\u7ecf\u77e5\u9053\u5982\u4f55\u5220\u9664\u9632\u706b\u5899\u89c4\u5219\uff0c\u90a3\u4e48\u8ba9\u6211\u4eec\u6765\u770b\u770b\u5982\u4f55\u6e05\u9664\u89c4\u5219\u94fe\u3002.<\/p>\n<h2 id=\"%d9%81%d9%84%d8%a7%d8%b4-%da%a9%d8%b1%d8%af%d9%86-%d8%b2%d9%86%d8%ac%db%8c%d8%b1%d9%87-%d9%87%d8%a7\">\u95ea\u73b0\u94fe\u6761<\/h2>\n<p>iptables \u63d0\u4f9b\u4e86\u79fb\u9664\u94fe\u4e2d\u6240\u6709\u89c4\u5219\uff08\u5373\u5237\u65b0\u94fe\uff09\u7684\u65b9\u6cd5\u3002\u672c\u8282\u5c06\u4ecb\u7ecd\u591a\u79cd\u5b9e\u73b0\u65b9\u5f0f\u3002.<\/p>\n<h5 id=\"%d9%81%d9%84%d8%a7%d8%b4%db%8c%d9%86%da%af-%db%8c%da%a9-%d8%b2%d9%86%d8%ac%db%8c%d8%b1%d9%87\">\u51b2\u6d17\u94fe\u6761<\/h5>\n<p>\u8981\u5237\u65b0\u7279\u5b9a\u94fe\uff08\u8fd9\u5c06\u5220\u9664\u94fe\u4e2d\u7684\u6240\u6709\u89c4\u5219\uff09\uff0c\u53ef\u4ee5\u4f7f\u7528 -F \u6216\u7b49\u6548\u7684 -flush \u9009\u9879\u4ee5\u53ca\u8981\u5237\u65b0\u7684\u94fe\u540d\u79f0\u3002.<\/p>\n<p>\u4f8b\u5982\uff0c\u8981\u5220\u9664\u94fe\u4e2d\u7684\u6240\u6709\u89c4\u5219 <code>\u8f93\u5165<\/code>\u8fd0\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo iptables -F INPUT<\/code><\/pre>\n<\/div>\n<p>\u95ea\u70c1\u6240\u6709\u94fe\u6761<\/p>\n<p>\u8981\u6e05\u9664\u6240\u6709\u94fe\uff08\u5373\u5220\u9664\u6240\u6709\u9632\u706b\u5899\u89c4\u5219\uff09\uff0c\u53ef\u4ee5\u4f7f\u7528 -F \u9009\u9879\u6216\u5176\u7b49\u6548\u9009\u9879 -flush\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo iptables -F<\/code><\/pre>\n<\/div>\n<h2 id=\"%d9%81%d9%84%d8%a7%d8%b4-%d9%87%d9%85%d9%87-%d9%82%d9%88%d8%a7%d9%86%db%8c%d9%86%d8%8c-%d8%ad%d8%b0%d9%81-%d9%87%d9%85%d9%87-%d8%b2%d9%86%d8%ac%db%8c%d8%b1%d9%87%d9%87%d8%a7-%d9%88-%d9%be\">\u6e05\u9664\u6240\u6709\u89c4\u5219\uff0c\u79fb\u9664\u6240\u6709\u94fe\uff0c\u5e76\u63a5\u53d7\u6240\u6709\u89c4\u5219\u3002<\/h2>\n<p>\u672c\u8282\u5c06\u5411\u60a8\u5c55\u793a\u5982\u4f55\u6e05\u9664\u6240\u6709\u9632\u706b\u5899\u89c4\u5219\u3001\u8868\u548c\u94fe\uff0c\u5e76\u5141\u8bb8\u6240\u6709\u7f51\u7edc\u6d41\u91cf\u3002.<\/p>\n<p>\u9996\u5148\uff0c\u5c06\u6bcf\u4e2a\u5185\u90e8\u94fe\u7684\u9ed8\u8ba4\u7b56\u7565\u8bbe\u7f6e\u4e3a ACCEPT\u3002\u8fd9\u6837\u505a\u7684\u4e3b\u8981\u76ee\u7684\u662f\u4e3a\u4e86\u786e\u4fdd\u60a8\u4e0d\u4f1a\u901a\u8fc7 SSH \u88ab\u9501\u5b9a\u5728\u670d\u52a1\u5668\u4e4b\u5916\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo iptables -P INPUT ACCEPT\r\nsudo iptables -P FORWARD ACCEPT\r\nsudo iptables -P OUTPUT ACCEPT<\/code><\/pre>\n<\/div>\n<p>\u7136\u540e\u5237\u65b0 NAT \u8868\u548c Mangle \u8868\uff0c\u6e05\u9664\u6240\u6709\u94fe\uff08-F\uff09\uff0c\u5e76\u5220\u9664\u6240\u6709\u975e\u9ed8\u8ba4\u94fe\uff08-X\uff09\uff1a<\/p>\n<div class=\"hcb_wrap\" data-no-translation=\"\" data-no-auto-translation=\"\">\n<pre class=\"prism line-numbers lang-bash\" data-lang=\"Bash\"><code>sudo iptables -t nat -F\r\nsudo iptables -t mangle -F\r\nsudo iptables -F\r\nsudo iptables -X<\/code><\/pre>\n<\/div>\n<p>\u60a8\u7684\u9632\u706b\u5899\u73b0\u5728\u5c06\u5141\u8bb8\u6240\u6709\u7f51\u7edc\u6d41\u91cf\u3002\u5982\u679c\u60a8\u73b0\u5728\u5217\u51fa\u60a8\u7684\u89c4\u5219\uff0c\u60a8\u4f1a\u53d1\u73b0\u6ca1\u6709\u4efb\u4f55\u89c4\u5219\uff0c\u53ea\u5269\u4e0b\u4e09\u4e2a\u9ed8\u8ba4\u94fe\uff08INPUT\u3001FORWARD \u548c OUTPUT\uff09\u3002.<\/p>\n<h2 id=\"%d9%86%d8%aa%db%8c%d8%ac%d9%87\">\u7ed3\u679c<\/h2>\n<p>\u5b8c\u6210\u672c\u6559\u7a0b\u540e\uff0c\u60a8\u5df2\u7ecf\u4e86\u89e3\u4e86\u5982\u4f55\u5217\u51fa\u548c\u5220\u9664 iptables \u9632\u706b\u5899\u89c4\u5219\u3002\u8bf7\u8bb0\u4f4f\uff0c\u901a\u8fc7 iptables \u547d\u4ee4\u6240\u505a\u7684\u4efb\u4f55\u66f4\u6539\u90fd\u662f\u6682\u65f6\u7684\uff0c\u5fc5\u987b\u4fdd\u5b58\u624d\u80fd\u5728\u670d\u52a1\u5668\u91cd\u542f\u540e\u4ecd\u7136\u6709\u6548\u3002\u8fd9\u5728\u201c\u5e38\u7528\u9632\u706b\u5899\u89c4\u5219\u548c\u547d\u4ee4\u201d\u6559\u7a0b\u7684\u201c\u4fdd\u5b58\u89c4\u5219\u201d\u90e8\u5206\u6709\u8be6\u7ec6\u4ecb\u7ecd\u3002.<\/p>","protected":false},"excerpt":{"rendered":"\u7b80\u4ecb Iptables \u662f\u4e00\u4e2a\u9632\u706b\u5899\uff0c\u5728\u5927\u591a\u6570 Linux 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