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c\u305f\u306e\u304b\u3001\u7834\u68c4\u3055\u308c\u305f\u306e\u304b\u3092\u5224\u65ad\u3059\u308b\u305f\u3081\u306b\u3001\u518d\u9001\u4fe1\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u3053\u3068\u306f\u3001\u60aa\u610f\u306e\u3042\u308b\u653b\u6483\u8005\u304c\u30b5\u30fc\u30d0\u30fc\u30dd\u30fc\u30c8\u306e\u72b6\u614b\u306b\u95a2\u3059\u308b\u60c5\u5831\u3092\u5f97\u308b\u305f\u3081\u306b\u8cbb\u3084\u3059\u6642\u9593\u3092\u5897\u3084\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u5408\u6cd5\u7684\u306a\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u306b\u3082\u554f\u984c\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>Traffic\u3092\u30c9\u30ed\u30c3\u30d7\u3059\u308b\u4ee3\u308f\u308a\u306b\u3001\u8a31\u53ef\u3055\u308c\u3066\u3044\u306a\u3044\u30d1\u30b1\u30c3\u30c8\u3092\u660e\u793a\u7684\u306b\u62d2\u5426\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002ICMP\uff08Internet Control Message Protocol\uff09\u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u5168\u4f53\u3067\u4f7f\u7528\u3055\u308c\u308b\u30e1\u30bf\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3001TCP\u3084UDP\u306a\u3069\u306e\u5f93\u6765\u306e\u901a\u4fe1\u30d7\u30ed\u30c8\u30b3\u30eb\u306b\u4f9d\u5b58\u3057\u306a\u3044\u3001\u30db\u30b9\u30c8\u9593\u3067\u30b9\u30c6\u30fc\u30bf\u30b9\u3001\u8a3a\u65ad\u3001\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9001\u4fe1\u3059\u308b\u305f\u3081\u306e\u30a2\u30a6\u30c8\u30aa\u30d6\u30d0\u30f3\u30c9\u30c1\u30e3\u30cd\u30eb\u3068\u3057\u3066\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002DROP\u30bf\u30fc\u30b2\u30c3\u30c8\u306e\u4ee3\u308f\u308a\u306bREJECT\u30bf\u30fc\u30b2\u30c3\u30c8\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u304c\u62d2\u5426\u3055\u308c\u3001ICMP\u30d1\u30b1\u30c3\u30c8\u304c\u9001\u4fe1\u8005\u306b\u8fd4\u3055\u308c\u3001\u5f7c\u3089\u306e\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u306f\u53d7\u3051\u5165\u308c\u3089\u308c\u306a\u3044\u3053\u3068\u304c\u901a\u77e5\u3055\u308c\u307e\u3059\u3002\u7406\u7531\u3092\u660e\u793a\u3059\u308b\u305f\u3081\u306b\u30b9\u30c6\u30fc\u30bf\u30b9\u30e1\u30c3\u30bb\u30fc\u30b8\u3082\u542b\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306b\u306f\u3044\u304f\u3064\u304b\u306e\u7d50\u679c\u304c\u3042\u308a\u307e\u3059\u3002ICMP\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u304c\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u5c4a\u3051\u308b\u3053\u3068\u304c\u8a31\u53ef\u3055\u308c\u3066\u3044\u308b\u3068\u4eee\u5b9a\u3059\u308b\u3068\u3001\u5f7c\u3089\u306f\u3059\u3050\u306b\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u304c\u30d6\u30ed\u30c3\u30af\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u77e5\u3089\u3055\u308c\u307e\u3059\u3002\u6b63\u5f53\u306a\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u5834\u5408\u3001\u3053\u308c\u306f\u7ba1\u7406\u8005\u306b\u9023\u7d61\u3092\u53d6\u308b\u304b\u3001\u63a5\u7d9a\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u78ba\u8a8d\u3057\u3066\u6b63\u3057\u3044\u30dd\u30fc\u30c8\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3059\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u60aa\u610f\u306e\u3042\u308b\u30e6\u30fc\u30b6\u30fc\u306e\u5834\u5408\u3001\u3053\u308c\u306f\u5f7c\u3089\u304c\u77ed\u6642\u9593\u3067\u30b9\u30ad\u30e3\u30f3\u3092\u5b8c\u4e86\u3057\u3001\u958b\u3044\u3066\u3044\u308b\u30dd\u30fc\u30c8\u3001\u9589\u3058\u3066\u3044\u308b\u30dd\u30fc\u30c8\u3001\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3055\u308c\u305f\u30dd\u30fc\u30c8\u3092\u628a\u63e1\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3068\u3044\u3046\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n<p>\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u7834\u68c4\u3059\u308b\u304b\u62d2\u5426\u3059\u308b\u304b\u3092\u6c7a\u3081\u308b\u969b\u306b\u306f\u3001\u8003\u616e\u3059\u3079\u304d\u70b9\u304c\u305f\u304f\u3055\u3093\u3042\u308a\u307e\u3059\u3002\u91cd\u8981\u306a\u8003\u616e\u4e8b\u9805\u306e\u4e00\u3064\u306f\u3001\u307b\u3068\u3093\u3069\u306e\u60aa\u610f\u306e\u3042\u308b\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u304c\u81ea\u52d5\u5316\u3055\u308c\u305f\u30b9\u30af\u30ea\u30d7\u30c8\u306b\u3088\u3063\u3066\u884c\u308f\u308c\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u3053\u308c\u3089\u306e\u30b9\u30af\u30ea\u30d7\u30c8\u306f\u901a\u5e38\u3001\u76e3\u7763\u3055\u308c\u3066\u3044\u306a\u3044\u305f\u3081\u3001\u4e0d\u6b63\u306a\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u7834\u68c4\u3057\u3066\u3082\u610f\u5473\u306e\u3042\u308b\u6291\u6b62\u52b9\u679c\u306f\u306a\u304f\u3001\u6b63\u5f53\u306a\u30e6\u30fc\u30b6\u30fc\u306b\u30cd\u30ac\u30c6\u30a3\u30d6\u306a\u5f71\u97ff\u3092\u53ca\u307c\u3057\u307e\u3059\u3002\u3053\u306e\u30c6\u30fc\u30de\u306b\u3064\u3044\u3066\u306f\u3001Peter Benie\u306e\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u3067\u8a73\u7d30\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u30c9\u30ed\u30c3\u30d7\u3068\u62d2\u5426\u306e\u5fdc\u7b54\u30c6\u30fc\u30d6\u30eb<\/h3>\n<p>\u4ee5\u4e0b\u306e\u8868\u306f\u3001\u5b9b\u5148\u30dd\u30fc\u30c8\u306b\u9069\u7528\u3055\u308c\u3066\u3044\u308b\u30dd\u30ea\u30b7\u30fc\u306b\u5fdc\u3058\u3066\u3001\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3067\u4fdd\u8b77\u3055\u308c\u305f\u30b5\u30fc\u30d0\u30fc\u304c\u7570\u306a\u308b\u30ea\u30af\u30a8\u30b9\u30c8\u306b\u3069\u306e\u3088\u3046\u306b\u53cd\u5fdc\u3059\u308b\u304b\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<div>\n<div class=\"post-table\">\n<table>\n<thead>\n<tr>\n<th>Client Packet Type<\/th>\n<th>NMap Command<\/th>\n<th>Port Policy<\/th>\n<th>Response<\/th>\n<th>Inferred Port State<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>TCP<\/td>\n<td>nmap [-sT | -sS] -Pn &lt;server&gt;<\/td>\n<td>Accept<\/td>\n<td>TCP SYN\/ACK<\/td>\n<td>Open<\/td>\n<\/tr>\n<tr>\n<td>TCP<\/td>\n<td>nmap [-sT | -sS] -Pn &lt;server&gt;<\/td>\n<td>Drop<\/td>\n<td>(none)<\/td>\n<td>Filtered<\/td>\n<\/tr>\n<tr>\n<td>TCP<\/td>\n<td>nmap [-sT | -sS] -Pn &lt;server&gt;<\/td>\n<td>Reject<\/td>\n<td>TCP RESET<\/td>\n<td>Closed<\/td>\n<\/tr>\n<tr>\n<td>UDP<\/td>\n<td>nmap -sU -Pn &lt;server&gt;<\/td>\n<td>Accept<\/td>\n<td>(none)<\/td>\n<td>Open or Filtered<\/td>\n<\/tr>\n<tr>\n<td>UDP<\/td>\n<td>nmap -sU -Pn &lt;server&gt;<\/td>\n<td>Drop<\/td>\n<td>(none)<\/td>\n<td>Open or Filtered<\/td>\n<\/tr>\n<tr>\n<td>UDP<\/td>\n<td>nmap -sU -Pn &lt;server&gt;<\/td>\n<td>Reject<\/td>\n<td>ICMP Port Unreachable<\/td>\n<td>Closed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p>\u6700\u521d\u306e\u5217\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u9001\u4fe1\u3059\u308b\u30d1\u30b1\u30c3\u30c8\u306e\u30bf\u30a4\u30d7\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u30022\u756a\u76ee\u306e\u5217\u306b\u306f\u3001\u5404\u30b7\u30ca\u30ea\u30aa\u3092\u30c6\u30b9\u30c8\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3067\u304d\u308bnmap\u30b3\u30de\u30f3\u30c9\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u30023\u756a\u76ee\u306e\u5217\u306f\u3001\u30dd\u30fc\u30c8\u306b\u9069\u7528\u3055\u308c\u308b\u30dd\u30fc\u30c8\u30dd\u30ea\u30b7\u30fc\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u30024\u756a\u76ee\u306e\u5217\u306f\u3001\u30b5\u30fc\u30d0\u30fc\u304c\u9001\u4fe1\u3059\u308b\u5fdc\u7b54\u3067\u3042\u308a\u30015\u756a\u76ee\u306e\u5217\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u53d7\u4fe1\u3057\u305f\u5fdc\u7b54\u306b\u57fa\u3065\u3044\u3066\u30dd\u30fc\u30c8\u306b\u3064\u3044\u3066\u63a8\u6e2c\u3067\u304d\u308b\u60c5\u5831\u3067\u3059\u3002<\/p>\n<h2>ICMP\u30dd\u30ea\u30b7\u30fc<\/h2>\n<p>\u62d2\u5426\u3055\u308c\u305f\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u30c9\u30ed\u30c3\u30d7\u3059\u308b\u304b\u62d2\u5426\u3059\u308b\u304b\u3092\u6c7a\u5b9a\u3059\u308b\u306e\u3068\u540c\u69d8\u306b\u3001\u30b5\u30fc\u30d0\u30fc\u5b9b\u306eICMP\u30d1\u30b1\u30c3\u30c8\u3092\u53d7\u3051\u5165\u308c\u308b\u304b\u62d2\u5426\u3059\u308b\u304b\u306e\u9078\u629e\u80a2\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>ICMP\u306f\u591a\u304f\u306e\u3053\u3068\u306b\u4f7f\u7528\u3055\u308c\u308b\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3059\u3002\u5148\u8ff0\u306e\u3088\u3046\u306b\u3001\u4ed6\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u4f7f\u7528\u3057\u305f\u8981\u6c42\u306e\u72b6\u614b\u60c5\u5831\u3092\u8fd4\u3059\u305f\u3081\u306b\u3088\u304f\u9001\u4fe1\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u4e2d\u3067\u3082\u6700\u3082\u4e00\u822c\u7684\u306a\u6a5f\u80fd\u306e\u4e00\u3064\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u30d4\u30f3\u30b0\u3092\u9001\u4fe1\u3057\u3001\u9060\u9694\u30db\u30b9\u30c8\u3078\u306e\u63a5\u7d9a\u53ef\u80fd\u6027\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306e\u5fdc\u7b54\u3092\u884c\u3046\u3053\u3068\u3067\u3059\u3002\u77e5\u540d\u5ea6\u306f\u4f4e\u3044\u3067\u3059\u304c\u3001ICMP\u306b\u306f\u4ed6\u306b\u3082\u591a\u304f\u306e\u6709\u7528\u306a\u7528\u9014\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>ICMP\u30d1\u30b1\u30c3\u30c8\u306f\u300c\u30bf\u30a4\u30d7\u300d\u306b\u3088\u3063\u3066\u533a\u5206\u3055\u308c\u3001\u3055\u3089\u306b\u300c\u30b3\u30fc\u30c9\u300d\u3067\u7d30\u5206\u5316\u3055\u308c\u307e\u3059\u3002\u30bf\u30a4\u30d7\u306f\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u4e00\u822c\u7684\u306a\u610f\u5473\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u30bf\u30a4\u30d73\u306f\u5b9b\u5148\u304c\u5230\u9054\u4e0d\u80fd\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3057\u307e\u3059\u3002\u30b3\u30fc\u30c9\u306f\u3057\u3070\u3057\u3070\u30bf\u30a4\u30d7\u306b\u95a2\u3059\u308b\u8a73\u7d30\u60c5\u5831\u3092\u63d0\u4f9b\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001ICMP\u30bf\u30a4\u30d73\u30b3\u30fc\u30c93\u306f\u5b9b\u5148\u30dd\u30fc\u30c8\u304c\u5229\u7528\u3067\u304d\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3057\u3001ICMP\u30bf\u30a4\u30d73\u30b3\u30fc\u30c90\u306f\u5b9b\u5148\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u5230\u9054\u3067\u304d\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n<div class=\"post-conf-note\">\n<p class=\"post-conf-desc\">Note<\/p>\n<div>ICMP\u306e\u4e00\u90e8\u306e\u30bf\u30a4\u30d7\u306f\u5ec3\u6b62\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u7121\u6761\u4ef6\u3067\u30d6\u30ed\u30c3\u30af\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u3046\u3061\u306e\u3044\u304f\u3064\u304b\u306f\u3001ICMP\u30bd\u30fc\u30b9\u30af\u30a8\u30f3\u30c1\uff08\u30bf\u30a4\u30d74\u30b3\u30fc\u30c90\uff09\u3068\u4ee3\u66ff\u30db\u30b9\u30c8\uff08\u30bf\u30a4\u30d76\uff09\u3067\u3059\u3002\u307e\u305f\u3001\u30bf\u30a4\u30d71\u30012\u30017\u304a\u3088\u307315\u4ee5\u4e0a\u306f\u5168\u3066\u5ec3\u6b62\u3055\u308c\u3001\u5c06\u6765\u306e\u4f7f\u7528\u306e\u305f\u3081\u306b\u4e88\u7d04\u3055\u308c\u3066\u3044\u308b\u304b\u5b9f\u9a13\u7684\u306a\u3082\u306e\u3067\u3059\u3002\u591a\u304f\u306e\u4e0a\u6d41\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u306f\u3001\u3053\u308c\u3092\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u51e6\u7406\u3057\u307e\u3059\u3002<\/div>\n<\/div>\n<h3>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u69cb\u6210\u306b\u3088\u3063\u3066\u30d6\u30ed\u30c3\u30af\u3059\u308b\u30bf\u30a4\u30d7\u306e\u7a2e\u985e<\/h3>\n<p>\u7279\u5b9a\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a2d\u5b9a\u3067\u306f\u7279\u5b9a\u306eICMP\u30bf\u30a4\u30d7\u306f\u6709\u7528\u3067\u3059\u304c\u3001\u4ed6\u306e\u5834\u5408\u306b\u306f\u30d6\u30ed\u30c3\u30af\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001ICMP\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u30e1\u30c3\u30bb\u30fc\u30b8\uff08\u30bf\u30a4\u30d75\uff09\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u4e0d\u826f\u306a\u8a2d\u8a08\u3092\u660e\u3089\u304b\u306b\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002ICMP\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3078\u306e\u3088\u308a\u826f\u3044\u7d4c\u8def\u304c\u76f4\u63a5\u5229\u7528\u53ef\u80fd\u306a\u5834\u5408\u306b\u9001\u4fe1\u3055\u308c\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u30eb\u30fc\u30bf\u30fc\u304c\u540c\u3058\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306e\u4ed6\u306e\u30db\u30b9\u30c8\u306b\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u30d1\u30b1\u30c3\u30c8\u3092\u53d7\u4fe1\u3057\u305f\u5834\u5408\u3001\u5c06\u6765\u7684\u306b\u306f\u30d1\u30b1\u30c3\u30c8\u3092\u4ed6\u306e\u30db\u30b9\u30c8\u3092\u7d4c\u7531\u3057\u3066\u9001\u4fe1\u3059\u308b\u3088\u3046\u306b\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u901a\u77e5\u3059\u308b\u305f\u3081\u306bICMP\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9001\u4fe1\u3057\u307e\u3059\u3002<\/p>\n<p>\u3082\u3057\u4fe1\u983c\u3067\u304d\u308b\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u3044\u3066\u3001\u521d\u671f\u8a2d\u5b9a\u4e2d\u306b\u81ea\u8eab\u306e\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u30c6\u30fc\u30d6\u30eb\u306e\u975e\u52b9\u7387\u6027\u3092\u628a\u63e1\u3057\u305f\u3044\u5834\u5408\u3001\u3053\u308c\u306f\u5f79\u7acb\u3061\u307e\u3059\u3002\u4fe1\u983c\u3067\u304d\u306a\u3044\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u306f\u3001\u60aa\u610f\u306e\u3042\u308b\u30e6\u30fc\u30b6\u30fc\u304cICMP\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3092\u9001\u4fe1\u3057\u3066\u30db\u30b9\u30c8\u306e\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u30c6\u30fc\u30d6\u30eb\u3092\u64cd\u4f5c\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u4e00\u90e8\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u306f\u6709\u7528\u3067\u3042\u308a\u3001\u4ed6\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u306f\u6f5c\u5728\u7684\u306b\u6709\u5bb3\u3067\u3042\u308b\u4ed6\u306eICMP\u7a2e\u985e\u306b\u306f\u3001ICMP\u30eb\u30fc\u30bf\u544a\u77e5\uff08\u30bf\u30a4\u30d79\uff09\u3068\u30eb\u30fc\u30bf\u8981\u6c42\uff08\u30bf\u30a4\u30d710\uff09\u30d1\u30b1\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002\u30eb\u30fc\u30bf\u544a\u77e5\u3068\u8981\u6c42\u30d1\u30b1\u30c3\u30c8\u306f\u3001ICMP\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30eb\u30fc\u30bf\u30fc\u767a\u898b\u30d7\u30ed\u30c8\u30b3\u30eb\uff08IRDP\uff09\u306e\u4e00\u90e8\u3068\u3057\u3066\u4f7f\u7528\u3055\u308c\u3001\u30db\u30b9\u30c8\u304c\u8d77\u52d5\u6642\u3084\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u53c2\u52a0\u3057\u305f\u969b\u306b\u5229\u7528\u53ef\u80fd\u306a\u30eb\u30fc\u30bf\u30fc\u3092\u30c0\u30a4\u30ca\u30df\u30c3\u30af\u306b\u767a\u898b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u307b\u3068\u3093\u3069\u306e\u5834\u5408\u3001\u30db\u30b9\u30c8\u304c\u4f7f\u7528\u3059\u308b\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306b\u5bfe\u3057\u3066\u9759\u7684\u306a\u30eb\u30fc\u30c8\u306e\u8a2d\u5b9a\u304c\u3042\u308b\u65b9\u304c\u826f\u3044\u3067\u3059\u3002\u3053\u308c\u3089\u306e\u30d1\u30b1\u30c3\u30c8\u306fICMP\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u30d1\u30b1\u30c3\u30c8\u3068\u540c\u3058\u72b6\u6cc1\u3067\u53d7\u3051\u5165\u308c\u308b\u3079\u304d\u3067\u3059\u3002\u5b9f\u969b\u306b\u3001\u30db\u30b9\u30c8\u306f\u767a\u898b\u3055\u308c\u305f\u30eb\u30fc\u30c8\u306e\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u306e\u512a\u5148\u30eb\u30fc\u30c8\u3092\u77e5\u3089\u306a\u3044\u305f\u3081\u3001\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u767a\u898b\u76f4\u5f8c\u306b\u3057\u3070\u3057\u3070\u5fc5\u8981\u3067\u3059\u3002\u3082\u3057\u3082\u30eb\u30fc\u30bf\u30fc\u30bd\u30ea\u30b7\u30c6\u30fc\u30b7\u30e7\u30f3\u30d1\u30b1\u30c3\u30c8\u3092\u9001\u4fe1\u3057\u305f\u308a\u3001\u5e83\u544a\u30d1\u30b1\u30c3\u30c8\u306b\u57fa\u3065\u3044\u3066\u30eb\u30fc\u30c8\u3092\u5909\u66f4\u3059\u308b\u30b5\u30fc\u30d3\u30b9\uff08\u4f8b\u3048\u3070rdisc\uff09\u3092\u5b9f\u884c\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u306f\u3001\u3053\u308c\u3089\u306e\u30d1\u30b1\u30c3\u30c8\u3092\u5b89\u5168\u306b\u30d6\u30ed\u30c3\u30af\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u3088\u304f\u8a31\u53ef\u3057\u3066\u3082\u5b89\u5168\u306a\u30bf\u30a4\u30d7<\/h3>\n<p>\u901a\u5e38\u5b89\u5168\u306a\u8a31\u53efICMP\u30bf\u30a4\u30d7\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u304c\u3001\u3088\u308a\u614e\u91cd\u306b\u3057\u305f\u3044\u5834\u5408\u306f\u7121\u52b9\u306b\u3059\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li>Type 8 \u2014 Echo request: These are ping requests directed at your server. It is usually safe to allow these (denying these packets doesn\u2019t hide your server, since there are plenty of other ways for users to find out if your host is up), but you can block them or limit the source addresses you respond to if you\u2019d like.<\/li>\n<li>Type 13 \u2014 Timestamp request: These packets can be used by clients to collect latency information. They can be used in some OS fingerprinting techniques, so you can block them or limit the range of addresses that you respond to.<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u306e\u30bf\u30a4\u30d7\u306f\u3001\u901a\u5e38\u3001\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3092\u8a2d\u5b9a\u3057\u3066\u81ea\u5206\u81ea\u8eab\u304c\u884c\u3063\u305f\u30ea\u30af\u30a8\u30b9\u30c8\u3078\u306e\u5fdc\u7b54\u3092\u8a31\u53ef\u3059\u308b\u3053\u3068\u3067\u3001\u660e\u793a\u7684\u306a\u30eb\u30fc\u30eb\u306a\u3057\u306b\u8a31\u53ef\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\uff08conntrack\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u4f7f\u7528\u3057\u3066ESTABLISHED\u304a\u3088\u3073RELATED\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u8a31\u53ef\u3059\u308b\u3053\u3068\u3067\uff09\u3002<\/p>\n<ul class=\"post-ul\">\n<li>Type 0 \u2014 Echo replies: These are responses to echo requests (pings).<\/li>\n<li>Type 3 \u2014 Destination Unreachable: Legitimate destination unreachable packets are responses to requests created by your server indicating that the packet could not be delivered.<\/li>\n<li>Type 11 \u2014 Time exceeded: This is a diagnostic error returned if a packet generated by your server died before reaching the destination because of exceeding its TTL value.<\/li>\n<li>Type 12 \u2014 Parameter problem: This means that an outgoing packet from your server was malformed.<\/li>\n<li>Type 14 \u2014 Timestamp responses: These are the responses for timestamp queries generated by your server.<\/li>\n<\/ul>\n<p>\u4e00\u90e8\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5c02\u9580\u5bb6\u306f\u3001\u3059\u3079\u3066\u306e\u53d7\u4fe1ICMP\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u306e\u30d6\u30ed\u30c3\u30af\u3092\u63a8\u5968\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u4eca\u3067\u306f\u591a\u304f\u306e\u4eba\u3005\u304c\u30a4\u30f3\u30c6\u30ea\u30b8\u30a7\u30f3\u30c8\u306aICMP\u53d7\u4fe1\u30dd\u30ea\u30b7\u30fc\u3092\u5968\u52b1\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e2\u3064\u306eStackexchange\u30b9\u30ec\u30c3\u30c9\u306b\u306f\u3001\u3055\u3089\u306a\u308b\u60c5\u5831\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>\u63a5\u7d9a\u5236\u9650\u3068\u30ec\u30fc\u30c8\u5236\u9650<\/h2>\n<p>\u4e00\u90e8\u306e\u30b5\u30fc\u30d3\u30b9\u3084\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u30d1\u30bf\u30fc\u30f3\u306b\u304a\u3044\u3066\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u30a2\u30af\u30bb\u30b9\u3092\u4e71\u7528\u3057\u3066\u3044\u306a\u3044\u9650\u308a\u306b\u304a\u3044\u3066\u306e\u307f\u30a2\u30af\u30bb\u30b9\u3092\u8a31\u53ef\u3057\u305f\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u30ea\u30bd\u30fc\u30b9\u4f7f\u7528\u306e\u5236\u9650\u65b9\u6cd5\u3068\u3057\u3066\u3001\u63a5\u7d9a\u6570\u5236\u9650\u3068\u30ec\u30fc\u30c8\u5236\u9650\u306e2\u3064\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>\u63a5\u7d9a\u5236\u9650<\/h3>\n<p>\u63a5\u7d9a\u5236\u9650\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u30aa\u30fc\u30d7\u30f3\u3057\u3066\u3044\u308b\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u63a5\u7d9a\u306e\u6570\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u305f\u3081\u306b\u3001connlimit\u306a\u3069\u306e\u62e1\u5f35\u6a5f\u80fd\u3092\u4f7f\u7528\u3057\u3066\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u540c\u6642\u306b\u8a31\u53ef\u3055\u308c\u308b\u63a5\u7d9a\u306e\u6570\u3092\u5236\u9650\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002\u63a5\u7d9a\u5236\u9650\u3092\u8ab2\u3059\u3053\u3068\u3092\u6c7a\u5b9a\u3057\u305f\u5834\u5408\u3001\u3044\u304f\u3064\u304b\u306e\u6c7a\u5b9a\u3092\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li>Do you limit on a per-address, per-network, or global basis?<\/li>\n<li>Do you match and restrict traffic for a specific service or to the server as a whole?<\/li>\n<\/ul>\n<p>\u63a5\u7d9a\u306f\u3001\u30db\u30b9\u30c8\u3054\u3068\u306b\u5236\u9650\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3057\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\uff08\u7d44\u7e54\u5168\u4f53\u306eIP\u30a2\u30c9\u30ec\u30b9\u7bc4\u56f2\u306a\u3069\uff09\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bb\u30b0\u30e1\u30f3\u30c8\u3054\u3068\u306b\u5236\u9650\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u30b5\u30fc\u30d3\u30b9\u3084\u6a5f\u5668\u5168\u4f53\u306e\u63a5\u7d9a\u6570\u306b\u5bfe\u3057\u3066\u3082\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u6700\u5927\u6570\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u3089\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u3088\u308a\u8907\u96d1\u306a\u63a5\u7d9a\u5236\u9650\u30dd\u30ea\u30b7\u30fc\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<h3>\u30ec\u30fc\u30c8\u5236\u9650<\/h3>\n<p>\u30ec\u30fc\u30c8\u5236\u9650\u306f\u3001\u30b5\u30fc\u30d0\u30fc\u304c\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u53d7\u3051\u5165\u308c\u308b\u901f\u5ea6\u3084\u983b\u5ea6\u3092\u5236\u5fa1\u3059\u308b\u30eb\u30fc\u30eb\u3092\u4f5c\u6210\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002\u30ec\u30fc\u30c8\u5236\u9650\u306b\u306f\u3001limit\u3001hashlimit\u3001recent\u3092\u542b\u3080\u3055\u307e\u3056\u307e\u306a\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u306e\u62e1\u5f35\u6a5f\u80fd\u304c\u3042\u308a\u307e\u3059\u3002\u4f7f\u7528\u3059\u308b\u62e1\u5f35\u6a5f\u80fd\u306e\u9078\u629e\u306f\u3001\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u5236\u9650\u3059\u308b\u65b9\u6cd5\u306b\u5927\u304d\u304f\u4f9d\u5b58\u3057\u307e\u3059\u3002<\/p>\n<p>\u5236\u9650\u306e\u5ef6\u9577\u306b\u3088\u308a\u3001\u305d\u306e\u30eb\u30fc\u30eb\u306f\u5236\u9650\u306b\u9054\u3059\u308b\u307e\u3067\u4e00\u81f4\u3057\u7d9a\u3051\u3001\u305d\u306e\u5f8c\u306b\u306f\u3055\u3089\u306a\u308b\u30d1\u30b1\u30c3\u30c8\u306f\u7834\u68c4\u3055\u308c\u307e\u3059\u3002\u4f8b\u3048\u3070\u30015\/\u79d2\u3068\u3044\u3046\u5236\u9650\u3067\u306f\u30011\u79d2\u3042\u305f\u308a5\u3064\u306e\u30d1\u30b1\u30c3\u30c8\u304c\u4e00\u81f4\u3057\u3001\u305d\u306e\u5f8c\u306f\u30eb\u30fc\u30eb\u304c\u4e00\u81f4\u3057\u306a\u304f\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30b5\u30fc\u30d3\u30b9\u306e\u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u30ec\u30fc\u30c8\u5236\u9650\u3092\u8a2d\u5b9a\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002\u307e\u305f\u3001Fail2ban\u306e\u3088\u3046\u306a\u8ffd\u52a0\u306e\u30b5\u30fc\u30d3\u30b9\u3092\u5c55\u958b\u3057\u3066\u3001\u7e70\u308a\u8fd4\u3057\u306e\u63a5\u7d9a\u8a66\u884c\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30cf\u30c3\u30b7\u30e5\u30ea\u30df\u30c3\u30c8\u62e1\u5f35\u6a5f\u80fd\u306f\u67d4\u8edf\u6027\u304c\u3042\u308a\u3001iptables\u304c\u30de\u30c3\u30c1\u3092\u8a55\u4fa1\u3059\u308b\u305f\u3081\u306b\u30cf\u30c3\u30b7\u30e5\u5316\u3059\u308b\u5024\u3092\u3044\u304f\u3064\u304b\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u30bd\u30fc\u30b9\u30a2\u30c9\u30ec\u30b9\u3001\u30bd\u30fc\u30b9\u30dd\u30fc\u30c8\u3001\u5b9b\u5148\u30a2\u30c9\u30ec\u30b9\u3001\u5b9b\u5148\u30dd\u30fc\u30c8\u306e\u3044\u305a\u308c\u304b\u3001\u307e\u305f\u306f\u3053\u308c\u3089\uff14\u3064\u306e\u5024\u306e\u7d44\u307f\u5408\u308f\u305b\u3092\u5404\u30a8\u30f3\u30c8\u30ea\u30fc\u306e\u8a55\u4fa1\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30d1\u30b1\u30c3\u30c8\u6570\u307e\u305f\u306f\u53d7\u4fe1\u30d0\u30a4\u30c8\u6570\u3067\u5236\u9650\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u67d4\u8edf\u306a\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u6bce\u307e\u305f\u306f\u30b5\u30fc\u30d3\u30b9\u6bce\u306e\u30ec\u30fc\u30c8\u5236\u9650\u304c\u884c\u3048\u307e\u3059\u3002<\/p>\n<p>\u6700\u8fd1\u306e\u62e1\u5f35\u6a5f\u80fd\u3067\u306f\u3001\u30eb\u30fc\u30eb\u304c\u4e00\u81f4\u3057\u305f\u5834\u5408\u306b\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u30ea\u30b9\u30c8\u306b\u52d5\u7684\u306b\u8ffd\u52a0\u3059\u308b\u304b\u3001\u65e2\u5b58\u306e\u30ea\u30b9\u30c8\u3068\u7167\u5408\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u8907\u96d1\u306a\u30d1\u30bf\u30fc\u30f3\u306b\u5bfe\u3057\u3066\u9650\u5b9a\u30ed\u30b8\u30c3\u30af\u3092\u8907\u6570\u306e\u7570\u306a\u308b\u30eb\u30fc\u30eb\u306b\u5e83\u3052\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ed6\u306e\u5236\u9650\u6a5f\u80fd\u3068\u540c\u69d8\u306b\u3001\u30d2\u30c3\u30c8\u6570\u3068\u6642\u9593\u7bc4\u56f2\u3092\u6307\u5b9a\u3067\u304d\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u8ffd\u52a0\u306e\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u304c\u78ba\u8a8d\u3055\u308c\u305f\u5834\u5408\u306b\u6642\u9593\u7bc4\u56f2\u3092\u30ea\u30bb\u30c3\u30c8\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5236\u9650\u304c\u304b\u304b\u3063\u3066\u3044\u308b\u5834\u5408\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306f\u3059\u3079\u3066\u306e\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u505c\u6b62\u3059\u308b\u3053\u3068\u304c\u6c42\u3081\u3089\u308c\u307e\u3059\u3002<\/p>\n<h2>\u5358\u4e00\u4f53\u7ba1\u7406 vs 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class=\"post-ul\">\n<li>How the Iptables Firewall Works<\/li>\n<li>A Deep Dive into Iptables and Netfilter Architecture<\/li>\n<\/ul>\n<p>\u6b21\u306e\u30ac\u30a4\u30c9\u306f\u3001\u65b9\u91dd\u306e\u5b9f\u65bd\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u307e\u3059\u3002\u59cb\u3081\u308b\u305f\u3081\u306b\u3001\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u306b\u5408\u308f\u305b\u305f\u30ac\u30a4\u30c9\u3092\u9078\u3093\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n<ul class=\"post-ul\">\n<li>How To Set Up a Firewall Using Nftables on Ubuntu 22.04<\/li>\n<li>How To Set Up a Firewall with UFW on Ubuntu 22.04<\/li>\n<li>How To Set Up a Firewall Using FirewallD on Rocky Linux 9<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u81ea\u5df1\u7d39\u4ecb 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