{"id":234,"date":"2020-06-22T14:48:09","date_gmt":"2020-06-22T05:48:09","guid":{"rendered":"http:\/\/192.168.0.101\/?p=234"},"modified":"2020-10-02T10:55:24","modified_gmt":"2020-10-02T01:55:24","slug":"%e3%83%95%e3%82%a1%e3%82%a4%e3%82%a2%e3%82%a6%e3%82%a9%e3%83%bc%e3%83%abiptables%e3%82%92%e8%a8%ad%e5%ae%9a","status":"publish","type":"post","link":"https:\/\/raspi-katsuyou.com\/index.php\/2020\/06\/22\/14\/48\/09\/234\/","title":{"rendered":"\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb(iptables)\u3092\u8a2d\u5b9a"},"content":{"rendered":"\n<p>\u30b5\u30fc\u30d0\u30fc\u3092\u904b\u7528\u3059\u308b\u306b\u3042\u305f\u308a\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u8a2d\u5b9a\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002\u4eca\u56de\u306f\u3001\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\uff08iptables)\u306e\u8a2d\u5b9a\u3092\u304a\u3053\u306a\u3063\u305f\u306e\u3067\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u3082\u305d\u3082\u3001\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb(iptables)\u3067\u4f55\u3092\u3084\u3063\u3066\u3044\u308b\u304b\u3068\u3044\u3046\u3068\u3001\u30d7\u30ed\u30c8\u30b3\u30eb\u3084\u30dd\u30fc\u30c8\u756a\u53f7\u3092\u5143\u306b\u30d1\u30b1\u30c3\u30c8\u306e\u53d7\u4fe1\u3001\u8ee2\u9001\u3001\u9001\u4fe1\u306e\u53ef\u5426\u3092\u5236\u5fa1\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>TCPwrapper\uff08hosts.allow\u3084hosts.deny\u3067\u30a2\u30af\u30bb\u30b9\u5236\u9650\u3092\u884c\u3046\uff09\u3067\u3082\u540c\u3058\u3088\u3046\u306b(\u53b3\u5bc6\u306b\u306f\u9055\u3044\u307e\u3059\u304c)\u30b5\u30fc\u30d3\u30b9\u3054\u3068\u306b\u5236\u9650\u3092\u304b\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e2\u3064\u3092\u4f75\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u4e8c\u91cd\u3067\u30a2\u30af\u30bb\u30b9\u5236\u5fa1\u304c\u3067\u304d\u3001\u3088\u308a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u5f37\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002ssh\u306a\u3069\u306e\u91cd\u8981\u306a\u30b5\u30fc\u30d3\u30b9\u306f\u3001iptables\u3067\u8a31\u53ef\u3057\u305f\u5f8c\u306b\u3001TCPwrapper\u3067\u63a5\u7d9a\u3067\u304d\u308b\u30db\u30b9\u30c8\u306b\u5236\u9650\u3092\u304b\u3051\u3066\u304a\u304f\u3068\u5b89\u5fc3\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<p>\u3084\u3084\u3053\u3057\u3044\u3067\u3059\u304c\u3001\u7c21\u5358\u306b\u8aac\u660e\u3059\u308b\u3068iptables\u3068TCPwrapper\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u968e\u5c64\u3067\u8003\u3048\u305f\u5834\u5408\u306b\u3001\u52d5\u4f5c\u3059\u308b\u968e\u5c64\u304c\u7570\u306a\u3063\u3066\u3044\u307e\u3059\u3002iptables\u306f\u30d1\u30b1\u30c3\u30c8\u30ec\u30d9\u30eb\u306e\u30d5\u30a3\u30eb\u30bf\u3067\u3042\u308b\u306e\u306b\u5bfe\u3057\u3066\u3001TCPwrapper\u306f\u30b5\u30fc\u30d3\u30b9\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u5074\u3067\u306e\u5b9f\u88c5\u3067\u3059\u3002TCPwrapper\u306b\u5bfe\u5fdc\u3057\u305f\u30bd\u30d5\u30c8\u3067\u306a\u3044\u3068\u8a2d\u5b9a\u3057\u3066\u3082\u53cd\u6620\u3055\u308c\u307e\u305b\u3093\u3002ssh\u306fTCPwrapper\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u306e\u3067\u8a2d\u5b9a\u3057\u305f\u30d5\u30a3\u30eb\u30bf\u306e\u8a2d\u5b9a\u304c\u53cd\u6620\u3055\u308c\u307e\u3059\u3002(SSH\u306e\u30d1\u30b1\u30c3\u30c8\u3092\u901a\u904e\u3055\u305b\u3066\u3001ssh\u3092\u4f7f\u3046\u5834\u5408\u306b\u63a5\u7d9a\u5143\u306e\u30db\u30b9\u30c8\u306b\u5236\u9650\u3092\u304b\u3051\u308b\u306a\u3069\u306e\u7d44\u307f\u5408\u308f\u305b\u304c\u53ef\u80fd\uff09\u307e\u305f\u3001TCPwrapper\u306e\u8a2d\u5b9a\u306f\u3001\u30b5\u30fc\u30d3\u30b9\u306e\u518d\u8d77\u52d5\u306f\u4e0d\u8981\u3067\u3001\u66f8\u304d\u63db\u3048\u305f\u5f8c\u306b\u65b0\u3057\u3044\u8a2d\u5b9a\u304c\u53c2\u7167\u3055\u308c\u307e\u3059\u3002TCPwrapper\u306e\u8a2d\u5b9a\u3092\u66f8\u304d\u63db\u3048\u308b\u5834\u5408\u306f\u3001\u5341\u5206\u306b\u6ce8\u610f\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\uff08\u66f8\u304d\u63db\u3048\u5f8c,\u3059\u3050\u306b\u63a5\u7d9a\u3067\u304d\u306a\u304f\u306a\u3063\u305f\u308a\u3057\u307e\u3059&#8230;)<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/raspi-katsuyou.com\/wp-content\/uploads\/2020\/07\/image-81.png\" alt=\"\" class=\"wp-image-1312\" width=\"526\" height=\"120\" srcset=\"https:\/\/raspi-katsuyou.com\/wp-content\/uploads\/2020\/07\/image-81.png 966w, https:\/\/raspi-katsuyou.com\/wp-content\/uploads\/2020\/07\/image-81-300x68.png 300w, https:\/\/raspi-katsuyou.com\/wp-content\/uploads\/2020\/07\/image-81-768x175.png 768w\" sizes=\"auto, (max-width: 526px) 100vw, 526px\" \/><figcaption>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u968e\u5c64\u3068\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u306e\u95a2\u4fc2<br>\u7c21\u5358\u306b\u8aac\u660e\u3059\u308b\u3068\u3001\u4e0b\u306e\u968e\u5c64\u304c\u30cf\u30fc\u30c9\u5074\u3067\u3001\u4e0a\u306e\u968e\u5c64\u304c\u30bd\u30d5\u30c8\u5074\u306b\u8fd1\u3044\u30a4\u30e1\u30fc\u30b8\u3067\u3059\u3002<\/figcaption><\/figure>\n\n\n\n<p>\u3061\u3087\u3063\u3068\u308f\u304d\u9053\u306b\u305d\u308c\u307e\u3057\u305f\u304c\u3001\u672c\u984c\u306e\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb(iptable)\u8a2d\u5b9a\u306b\u5165\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb(iptable)\u8a2d\u5b9a\u306b\u306f\u3001INPUT\u3001OUTPUT\u3001FORWORD\u3068\u3044\u30463\u3064\u306e\u30dd\u30ea\u30b7\u30fc(\u65b9\u91dd)\u304c\u3042\u308a\u307e\u3059\u3002INPUT\u306f\u53d7\u4fe1\u30d1\u30b1\u30c3\u30c8\u306e\u30dd\u30ea\u30b7\u30fc\u3001OUTPUT\u306f\u9001\u4fe1\u30d1\u30b1\u30c3\u30c8\u306e\u30dd\u30ea\u30b7\u30fc\u3001FORWARD\u306f\u8ee2\u9001\u30d1\u30b1\u30c3\u30c8\u306e\u30dd\u30ea\u30b7\u30fc\u3067\u3059\u3002\u5404\u30dd\u30ea\u30b7\u30fc\u306b\u5bfe\u3057\u3066\u3001\u201dDROP\u201d(\u62d2\u5426)\u3001\u201dACCEPT\u201d(\u8a31\u53ef)\u306a\u3069\u306e\u57fa\u672c\u30dd\u30ea\u30b7\u30fc\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4eca\u56de\u306f\u3001\u5404\u30dd\u30ea\u30b7\u30fc\u306b\u5bfe\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u8003\u3048\u65b9\u3067\u8a2d\u5b9a\u3092\u884c\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>INPUT\uff1a\u53d7\u4fe1\u30d1\u30b1\u30c3\u30c8\u306b\u95a2\u3059\u308b\u57fa\u672c\u30dd\u30ea\u30b7\u30fc\u3092DROP\u306b\u3057\u3066\u3001\u8a31\u53ef\u3059\u308b\u30dd\u30fc\u30c8\u3092\u500b\u5225\u306bACCEPT<\/li><li>OUTPUT\uff1a\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u51fa\u3066\u3044\u304f\u65b9\u306a\u306e\u3067\u3001ACCEPT<\/li><li>FORWARD\uff1a\u4ed6\u306e\u30b5\u30fc\u30d0\u3078\u306e\u8ee2\u9001\u8a2d\u5b9a\u3067\u3001\u7279\u306b\u8ee2\u9001\u3059\u308b\u30b5\u30fc\u30d0\u30fc\u306f\u306a\u3044\u306e\u3067DROP<\/li><\/ul>\n\n\n\n<p>\u3067\u306f\u3001\u3055\u3063\u305d\u304f\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\uff08iptables)\u306e\u8a2d\u5b9a\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u307e\u305a\u306f\u3001iptable\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u307e\u3059\u3002<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">$ sudo apt-get install iptables-persistent<\/pre>\n\n\n\n<ul class=\"wp-block-list\"><li>\u73fe\u5728\u306e\u8a2d\u5b9a\u3092\u78ba\u8a8d\uff08\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f55\u3082\u5236\u9650\u3055\u308c\u3066\u3044\u306a\u3044\u72b6\u614b\u306b\u306a\u3063\u3066\u3044\u308b\u306f\u305a\uff09<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">$ sudo iptables -L\nChain INPUT (policy ACCEPT)\ntarget     prot opt source               destination\n\nChain FORWARD (policy ACCEPT)\ntarget     prot opt source               destination\n\nChain OUTPUT (policy ACCEPT)\ntarget     prot opt source               destination\n<\/pre>\n\n\n\n<ul class=\"wp-block-list\"><li>iptable\u306e\u30eb\u30fc\u30eb\u3092\u8a2d\u5b9a<\/li><\/ul>\n\n\n\n<p>\u4eca\u56de\u306f\u3001SSH(SFTP)\u3001HTTP\u3001HTTPS\u306e\u30dd\u30fc\u30c8\u3092\u8a31\u53ef\u3057\u3066\u3001\u4ed6\u306e\u901a\u4fe1\u306f\u62d2\u5426\u3059\u308b\u3088\u3046\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"796\" height=\"433\" src=\"https:\/\/raspi-katsuyou.com\/wp-content\/uploads\/2020\/06\/image-51.png\" alt=\"\" class=\"wp-image-266\" srcset=\"https:\/\/raspi-katsuyou.com\/wp-content\/uploads\/2020\/06\/image-51.png 796w, https:\/\/raspi-katsuyou.com\/wp-content\/uploads\/2020\/06\/image-51-300x163.png 300w, https:\/\/raspi-katsuyou.com\/wp-content\/uploads\/2020\/06\/image-51-768x418.png 768w\" sizes=\"auto, (max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px\" \/><figcaption><em>fireWall\u306e\u30a4\u30e1\u30fc\u30b8\u56f3(\u8a31\u53ef\u3057\u305f\u30b5\u30fc\u30d3\u30b9\u306e\u307f\u8a31\u53ef\u3057\u3066\u305d\u308c\u4ee5\u5916\u306e\u30b5\u30fc\u30d3\u30b9\u306f\u62d2\u5426)<\/em><\/figcaption><\/figure>\n\n\n\n<p>\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\uff08iptables)\u306e\u30eb\u30fc\u30eb\u30d5\u30a1\u30a4\u30eb\u300crules.v4\u300d\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">$ sudo vi \/etc\/iptables\/rules.v4<\/pre>\n\n\n\n<p>rules.v4\u306e\u4e2d\u8eab<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n*filter\n:INPUT DROP &#x5B;0:0]\n:FORWARD DROP &#x5B;0:0]\n:OUTPUT ACCEPT &#x5B;0:0]\n#\u30eb\u30fc\u30d7\u30d0\u30c3\u30af\u3092\u8a31\u53ef\n-A INPUT -i lo -j ACCEPT\n#\u78ba\u7acb\u3055\u308c\u305f\u5168\u3066\u306e\u53d7\u4fe1\u63a5\u7d9a\u3092\u8a31\u53ef\n-A INPUT -p tcp -m state --state ESTABLISHED,RELATED -j ACCEPT\n#DNS\u3092\u8a31\u53ef\n-A INPUT -p udp --sport 53 -j ACCEPT\n#SSH(SSH\u306b\u5272\u308a\u4ed8\u3051\u305f\u30dd\u30fc\u30c8\u756a\u53f7xxxx)\u306e\u65b0\u305f\u306a\u63a5\u7d9a\u3092\u8a31\u53ef\n-A INPUT -p tcp -m state --state NEW --dport xxxx -j ACCEPT\n#HTTP(80)\/HTTPS(443)\u306e\u8a31\u53ef\n-A INPUT -p tcp --dport 80 -j ACCEPT\n-A INPUT -p tcp --dport 443 -j ACCEPT\n#SAMBA\u306e\u8a31\u53ef\n-A INPUT -p tcp --dport 139 -j ACCEPT\n-A INPUT -p udp --dport 137 -j ACCEPT\n-A INPUT -p udp --dport 138 -j ACCEPT\n-A INPUT -p tcp --dport 445 -j ACCEPT\nCOMMIT\n<\/pre><\/div>\n\n\n<pre class=\"wp-block-preformatted\">\u3010\u3088\u304f\u4f7f\u3046\u30b3\u30de\u30f3\u30c9\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u3064\u3044\u3066\u88dc\u8db3\u3011\n\n-A \u30eb\u30fc\u30eb\u306e\u8ffd\u52a0\n\nINPUT \u5165\u3063\u3066\u304f\u308b\u30d1\u30b1\u30c3\u30c8\nOUTPUT \u51fa\u3066\u3044\u304f\u30d1\u30b1\u30c3\u30c8\nFORWARD \u8ee2\u9001\u3059\u308b\u30d1\u30b1\u30c3\u30c8\n\n-p \u30eb\u30fc\u30eb\u306e\u5bfe\u8c61\u3068\u306a\u308b\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u7a2e\u985e\u3092\u6307\u5b9a\n   tcp:TCP\u30d7\u30ed\u30c8\u30b3\u30eb\n   udp:UDP\u30d7\u30ed\u30c8\u30b3\u30eb\n   icmp:ICMP\u30d7\u30ed\u30c8\u30b3\u30eb\n\n-m state \u2013state&nbsp;\uff1a\n\u3000\u30fbNEW\u3000\u65b0\u3057\u3044\u63a5\u7d9a\n\u3000\u30fbESTABLEISHED\u3000\u3059\u3067\u306b\u8a31\u53ef\u3055\u308c\u3066\u3044\u308b\u63a5\u7d9a\n\u3000\u30fbRELATED\u3000\u65b0\u3057\u304f\u304b\u3064\u8a31\u53ef\u3055\u308c\u305f\u63a5\u7d9a\n\u3000\u30fbNVALID\u3000\u7121\u52b9\u306a\u63a5\u7d9a\n\n\n--sport\u3000\u9001\u4fe1\u5074\u306e\u30dd\u30fc\u30c8\u6307\u5b9a\n--dport\u3000\u53d7\u4fe1\u5074\u306e\u30dd\u30fc\u30c8\u6307\u5b9a\n\nACCEPT \u30d1\u30b1\u30c3\u30c8\u3092\u8a31\u53ef\nDROP \u30d1\u30b1\u30c3\u30c8\u3092\u62d2\u5426\nREJECT \u30d1\u30b1\u30c3\u30c8\u3092\u62d2\u5426\u3057\u3066\u5236\u5fa1\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9001\u4fe1<\/pre>\n\n\n\n<ul class=\"wp-block-list\"><li>\u65b0\u3057\u3044\u30eb\u30fc\u30eb\u3092\u9069\u7528\u3059\u308b<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">$ sudo iptables-apply \/etc\/iptables\/rules.v4\nApplying new iptables rules from '\/etc\/iptables\/rules.v4'\u2026 done.\nCan you establish NEW connections to the machine? (y\/N) y\n\u2026 then my job is done. See you next time.<\/pre>\n\n\n\n<ul class=\"wp-block-list\"><li>\u8a2d\u5b9a\u304c\u9069\u7528\u3055\u308c\u305f\u304b\u78ba\u8a8d<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">$sudo iptables -L\nChain INPUT (policy ACCEPT)\ntarget prot opt source destination\nACCEPT all -- anywhere anywhere\nACCEPT tcp -- anywhere anywhere state RELATED,ESTABLISHED\nACCEPT udp -- anywhere anywhere udp spt:domain\nACCEPT tcp -- anywhere anywhere state NEW tcp dpt:xxxx\nACCEPT tcp -- anywhere anywhere tcp dpt:http\nACCEPT tcp -- anywhere anywhere tcp dpt:https\nACCEPT tcp -- anywhere anywhere tcp dpt:netbios-ssn\nACCEPT udp -- anywhere anywhere udp dpt:netbios-ns\nACCEPT udp -- anywhere anywhere udp dpt:netbios-dgm\nACCEPT tcp -- anywhere anywhere tcp dpt:microsoft-ds\nChain FORWARD (policy ACCEPT)\ntarget prot opt source destination\nChain OUTPUT (policy ACCEPT)\ntarget prot opt source destination<\/pre>\n\n\n\n<p>\u610f\u56f3\u3057\u305f\u8a2d\u5b9a\u304c\u6709\u52b9\u306b\u306a\u3063\u3066\u3044\u308c\u3070OK\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306f\u3001\u8a2d\u5b9a\u6642\u306b\u8abf\u67fb\u3057\u305f\u5185\u5bb9(\u30e1\u30e2)\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"has-large-font-size\">iptable\u306e\u8a2d\u5b9a\u306b\u3064\u3044\u3066<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u4ee3\u8868\u7684\u306a\u30b5\u30fc\u30d3\u30b9\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u30dd\u30fc\u30c8\u756a\u53f7<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><th>\u30b5\u30fc\u30d3\u30b9\u540d<\/th><th>\u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u30dd\u30fc\u30c8\u756a\u53f7<\/th><\/tr><tr><td>http\u30b5\u30fc\u30d0\u30fc(HTTP)<\/td><td>TCP 80<\/td><\/tr><tr><td>http\u30b5\u30fc\u30d0\u30fc(SSL)<\/td><td>TCP 443<\/td><\/tr><tr><td>\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc(POP3)<\/td><td>TCP 110<\/td><\/tr><tr><td>\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc(IMAP)<\/td><td>TCP 143<\/td><\/tr><tr><td>\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc(SMTP)<\/td><td>TCP 25<\/td><\/tr><tr><td>\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc(submission port)<\/td><td>TCP 587<\/td><\/tr><tr><td>FTP<\/td><td>TCP 20, 21<\/td><\/tr><tr><td>SSH\u3001SFTP<\/td><td>TCP 22<\/td><\/tr><\/tbody><\/table><figcaption>\u3088\u304f\u4f7f\u308f\u308c\u308b\u30b5\u30fc\u30d3\u30b9\u306e\u30dd\u30fc\u30c8\u756a\u53f7\u306f\u3001<strong>\u30a6\u30a7\u30eb\u30ce\u30a6\u30f3\u30dd\u30fc\u30c8\u756a\u53f7<\/strong>(WELL KNOWN PORT NUMBERS)\u3068\u3044\u3063\u3066 0\u301c1023\u307e\u3067\u306e\u30dd\u30fc\u30c8\u756a\u53f7\u306e\u3069\u3053\u304b\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u3066\u3044\u308b\u3002<\/figcaption><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-medium-font-size\">iptable\u306e\u57fa\u672c\u7684\u306a\u8003\u3048\u65b9<\/p>\n\n\n\n<p>iptables\u306b\u306f\u3001INPUT\u3001OUTPUT\u3001FORWORD\u3068\u3044\u30463\u3064\u306e\u30dd\u30ea\u30b7\u30fc\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u305e\u308c\u306e\u901a\u4fe1\u306e\u57fa\u672c\u30dd\u30ea\u30b7\u30fc\u3092\u201dDROP\u201d(\u62d2\u5426)\u3001\u201dACCEPT\u201d(\u8a31\u53ef)\u306e\u3069\u3061\u3089\u304b\u306b\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002<br><\/p>\n\n\n\n<p>INPUT\u306f\u3001\u30b5\u30fc\u30d0\u30fc\u306b\u5165\u3063\u3066\u304f\u308b\u901a\u4fe1\u306e\u30dd\u30ea\u30b7\u30fc\u3067\u3059\u3002\u3053\u3053\u3067\u306f\u57fa\u672c\u30dd\u30ea\u30b7\u30fc\u3092\u201dDROP\u201d\u306b\u3057\u3066\u3001\u3042\u3068\u3067\u500b\u5225\u306e\u30dd\u30fc\u30c8\u306b\u5bfe\u3057\u3066\u8a31\u53ef\u3059\u308b\u8a2d\u5b9a\u306b\u3057\u307e\u3059\u3002<br>OUTPUT\u306f\u3001\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u51fa\u3066\u884c\u304f\u901a\u4fe1\u306e\u30dd\u30ea\u30b7\u30fc\u3067\u3059\u3002\u57fa\u672c\u30dd\u30ea\u30b7\u30fc\u306f\u201dACCEPT\u201c\u306b\u3057\u307e\u3059\u3002<br>FORWARD\u306f\u3001\u53d7\u4fe1\u3057\u305f\u30c7\u30fc\u30bf\u3092\u4ed6\u306e\u30b5\u30fc\u30d0\u30fc\u3078\u8ee2\u9001\u3059\u308b\u969b\u306b\u9069\u7528\u3055\u308c\u308b\u8a2d\u5b9a\u3067\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u7279\u306b\u8ee2\u9001\u3059\u308b\u30b5\u30fc\u30d0\u30fc\u306f\u7121\u3044\u306e\u3067\u201dDROP\u201d\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<figure 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