{"id":1378,"date":"2026-07-09T00:43:09","date_gmt":"2026-07-08T15:43:09","guid":{"rendered":"https:\/\/www.ecoop.net\/memo\/?p=1378"},"modified":"2026-07-16T15:15:17","modified_gmt":"2026-07-16T06:15:17","slug":"udp-port-check","status":"publish","type":"post","link":"https:\/\/www.ecoop.net\/memo\/archives\/udp-port-check.html","title":{"rendered":"UDP\u30dd\u30fc\u30c8\u304c\u958b\u3044\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3059\u308b\u65b9\u6cd5\u3068\u3001\u306a\u305c\u96e3\u3057\u3044\u306e\u304b"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u7d50\u8ad6\u304b\u3089\u8a00\u3046\u3068\u3001UDP\u306e\u30dd\u30fc\u30c8\u304c\u958b\u3044\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u306f100%\u78ba\u5b9f\u306b\u306f\u78ba\u8a8d\u3067\u304d\u307e\u305b\u3093\u3002TCP\u306e\u30dd\u30fc\u30c8\u78ba\u8a8d\u3068\u306f\u524d\u63d0\u304c\u307e\u3063\u305f\u304f\u9055\u3046\u304b\u3089\u3067\u3059\u3002\u305d\u308c\u3067\u3082\u5b9f\u7528\u4e0a\u300c\u958b\u3044\u3066\u3044\u305d\u3046\u300d\u300c\u9589\u3058\u3066\u3044\u305d\u3046\u300d\u3092\u5224\u65ad\u3059\u308b\u624b\u6bb5\u306f\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u307e\u305a\u4f55\u304c\u96e3\u3057\u3044\u306e\u304b\u3092\u8aac\u660e\u3057\u305f\u3042\u3068\u3001\u78ba\u8a8d\u624b\u6bb5\u3092\u78ba\u5b9f\u6027\u306e\u9ad8\u3044\u9806\u306b\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e00\u756a\u78ba\u5b9f:\u76f8\u624b\u304c\u5fdc\u7b54\u3092\u8fd4\u3059\u30d7\u30ed\u30c8\u30b3\u30eb\u306a\u3089\u3001\u5b9f\u969b\u306b\u554f\u3044\u5408\u308f\u305b\u3066\u5fdc\u7b54\u3092\u898b\u308b<\/li>\n\n\n\n<li>\u6b21\u306b\u73fe\u5b9f\u7684:<code>nmap -sU<\/code> \u3067\u30b9\u30ad\u30e3\u30f3\u3059\u308b(\u8981root)<\/li>\n\n\n\n<li>\u81ea\u5206\u306e\u30b5\u30fc\u30d0\u306a\u3089:\u5f85\u3061\u53d7\u3051\u3066\u3044\u308b\u30d7\u30ed\u30bb\u30b9\u3092\u30b5\u30fc\u30d0\u5074\u3067\u76f4\u63a5\u78ba\u8a8d\u3059\u308b<\/li>\n\n\n\n<li>\u88dc\u52a9:<code>tcpdump<\/code> \u3067\u30d1\u30b1\u30c3\u30c8\u304c\u5b9f\u969b\u306b\u5c4a\u3044\u305f\u304b\u898b\u308b<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><code>nc -vzu<\/code> \u3060\u3051\u3067\u5224\u5b9a\u3059\u308b\u306e\u306f\u304a\u3059\u3059\u3081\u3057\u307e\u305b\u3093\u3002\u7406\u7531\u306f\u6b21\u306e\u7ae0\u3067\u5b9f\u969b\u306b\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u306a\u305cUDP\u306e\u30dd\u30fc\u30c8\u78ba\u8a8d\u306fTCP\u3088\u308a\u96e3\u3057\u3044\u306e\u304b<\/h3>\n\n\n\n<!--more-->\n\n\n\n<p class=\"wp-block-paragraph\">TCP\u306f\u63a5\u7d9a\u3092\u59cb\u3081\u308b\u3068\u304d\u306b3\u30a6\u30a7\u30a4\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af(SYN \u2192 SYN-ACK \u2192 ACK)\u3092\u884c\u3044\u307e\u3059\u3002\u30dd\u30fc\u30c8\u304c\u958b\u3044\u3066\u3044\u308c\u3070SYN-ACK\u304c\u8fd4\u308a\u3001\u9589\u3058\u3066\u3044\u308c\u3070RST\u304c\u8fd4\u308a\u307e\u3059\u3002\u3069\u3061\u3089\u306e\u8fd4\u4e8b\u3082\u5fc5\u305a\u6765\u308b\u306e\u3067\u3001\u300c\u958b\u3044\u3066\u3044\u308b\/\u9589\u3058\u3066\u3044\u308b\u300d\u3092\u306f\u3063\u304d\u308a\u5224\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">UDP\u306b\u306f\u3053\u306e\u4ed5\u7d44\u307f\u304c\u3042\u308a\u307e\u305b\u3093\u3002UDP\u306f\u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u30ec\u30b9\u306a\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3001\u30c7\u30fc\u30bf\u3092\u9001\u308a\u3064\u3051\u308b\u3060\u3051\u3067\u3059\u3002\u76f8\u624b\u304b\u3089\u306e\u8fd4\u4e8b\u3092\u5f85\u3064\u3068\u3044\u3046\u6982\u5ff5\u81ea\u4f53\u304c\u30d7\u30ed\u30c8\u30b3\u30eb\u306b\u7d44\u307f\u8fbc\u307e\u308c\u3066\u3044\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u6b21\u306e\u3088\u3046\u306a\u3001TCP\u306b\u306f\u7121\u3044\u66d6\u6627\u3055\u304c\u751f\u307e\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30dd\u30fc\u30c8\u304c\u958b\u3044\u3066\u3044\u3066\u3082\u3001\u7121\u53cd\u5fdc\u304c\u6b63\u5e38\u3067\u3059\u3002\u5f85\u3061\u53d7\u3051\u3066\u3044\u308b\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u3001\u53d7\u3051\u53d6\u3063\u305f\u30c7\u30fc\u30bf\u306b\u5bfe\u3057\u3066\u4f55\u304b\u8fd4\u3059\u4f5c\u308a\u306b\u306a\u3063\u3066\u3044\u306a\u3051\u308c\u3070\u3001\u4f55\u3082\u8fd4\u3063\u3066\u304d\u307e\u305b\u3093\u3002\u3053\u308c\u306f\u7570\u5e38\u3067\u306f\u306a\u304f\u3001UDP\u3067\u306f\u666e\u901a\u306e\u3053\u3068\u3067\u3059\u3002<\/li>\n\n\n\n<li>\u30dd\u30fc\u30c8\u304c\u9589\u3058\u3066\u3044\u308c\u3070\u3001ICMP port unreachable\u304c\u8fd4\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u5b9b\u5148\u306eOS\u306f\u3001\u9001\u3089\u308c\u305f\u30dd\u30fc\u30c8\u3067\u5f85\u3061\u53d7\u3051\u308b\u30d7\u30ed\u30bb\u30b9\u304c\u7121\u3044\u3068\u304d\u3001\u9001\u4fe1\u5143\u306b\u5411\u3051\u3066\u300cICMP Destination Unreachable(type 3)\u3001code 3(port unreachable)\u300d\u3068\u3044\u3046\u30a8\u30e9\u30fc\u3092\u8fd4\u3059\u4ed5\u69d8\u306b\u306a\u3063\u3066\u3044\u307e\u3059(RFC 792)\u3002<\/li>\n\n\n\n<li>\u305f\u3060\u3057\u3001\u305d\u306eICMP\u306f\u63e1\u308a\u3064\u3076\u3055\u308c\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002\u9014\u4e2d\u306e\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u304cICMP\u3092\u30d6\u30ed\u30c3\u30af\u3057\u3066\u3044\u305f\u308a\u3001\u76f8\u624b\u306eOS\u304cICMP\u30a8\u30e9\u30fc\u306e\u9001\u51fa\u3092\u30ec\u30fc\u30c8\u5236\u9650\u3057\u3066\u3044\u305f\u308a\u3059\u308b\u3068\u3001\u9589\u3058\u3066\u3044\u308b\u30dd\u30fc\u30c8\u306b\u9001\u3063\u3066\u3082\u7121\u53cd\u5fdc\u306b\u306a\u308a\u307e\u3059\u3002\u3064\u307e\u308a\u7121\u53cd\u5fdc\u3068\u3044\u3046\u7d50\u679c\u3060\u3051\u3067\u306f\u3001\u300c\u958b\u3044\u3066\u3044\u3066\u5fdc\u7b54\u304c\u7121\u3044\u300d\u306e\u304b\u300c\u9589\u3058\u3066\u3044\u308b\u304cICMP\u304c\u5c4a\u304b\u306a\u3044\u300d\u306e\u304b\u3092\u533a\u5225\u3067\u304d\u307e\u305b\u3093\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u975e\u5bfe\u79f0\u3055\u306e\u305b\u3044\u3067\u3001UDP\u306e\u30dd\u30fc\u30c8\u30b9\u30ad\u30e3\u30f3\u306f\u539f\u7406\u7684\u306b\u300c\u958b\u3044\u3066\u3044\u308b\u300d\u3068\u65ad\u8a00\u3057\u3065\u3089\u3044\u7d50\u679c\u306b\u306a\u308a\u307e\u3059\u3002\u5b9f\u969b\u3001\u5b9a\u756a\u306e\u30dd\u30fc\u30c8\u30b9\u30ad\u30e3\u30ca\u3067\u3042\u308b <code>nmap<\/code> \u306f\u3001UDP\u30b9\u30ad\u30e3\u30f3\u306e\u7d50\u679c\u306b <code>open<\/code>\u30fb<code>closed<\/code>\u30fb<code>filtered<\/code> \u306b\u52a0\u3048\u3066 <code>open|filtered<\/code> \u3068\u3044\u3046\u3001\u5224\u5b9a\u3092\u4fdd\u7559\u3057\u305f\u72b6\u614b\u3092\u7528\u610f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><code>open|filtered<\/code>: Nmap places ports in this state when it is unable to determine whether a port is open or filtered. This occurs for scan types in which open ports give no response. The lack of response could also mean that a packet filter dropped the probe or any response it elicited.(Nmap\u516c\u5f0f\u30de\u30cb\u30e5\u30a2\u30eb\u3088\u308a)<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">\u300c\u7121\u53cd\u5fdc\u3060\u3063\u305f\u300d\u3068\u3044\u3046\u4e8b\u5b9f\u3060\u3051\u3067\u306f\u3001\u958b\u3044\u3066\u3044\u308b\u306e\u304b\u3001\u9593\u306b\u30d5\u30a3\u30eb\u30bf\u304c\u3042\u308b\u306e\u304b\u5206\u304b\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u304cUDP\u306e\u30dd\u30fc\u30c8\u78ba\u8a8d\u304c\u96e3\u3057\u3044\u672c\u8cea\u3067\u3059\u3002TCP\u306e\u611f\u899a\u306e\u307e\u307e\u300cping\u307f\u305f\u3044\u306b\u4e00\u767a\u3067\u767d\u9ed2\u3064\u304f\u300d\u3082\u306e\u3060\u3068\u601d\u3063\u3066\u3044\u308b\u3068\u3001\u3053\u3053\u3067\u3064\u307e\u305a\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><code>nc -vzu<\/code> \u306e\u7d50\u679c\u306f\u9d5c\u5451\u307f\u306b\u3067\u304d\u306a\u3044<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">UDP\u306e\u758e\u901a\u78ba\u8a8d\u306b\u3088\u304f\u4f7f\u308f\u308c\u308b\u306e\u304c <code>nc<\/code>(netcat)\u306e <code>-z<\/code>(\u30b9\u30ad\u30e3\u30f3\u30e2\u30fc\u30c9)\u3068 <code>-u<\/code>(UDP)\u3092\u7d44\u307f\u5408\u308f\u305b\u305f <code>nc -vzu<\/code> \u3067\u3059\u3002\u3067\u3059\u304c\u3001\u3053\u306e\u7d50\u679c\u306f\u5f53\u3066\u306b\u306a\u308a\u307e\u305b\u3093\u3002\u5b9f\u969b\u306b\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u624b\u5143\u306emacOS(\u6a19\u6e96\u306e<code>nc<\/code>\u3001\u3044\u308f\u3086\u308bOpenBSD\u7cfb)\u3067\u3001\u307e\u305a12399\u756a\u30dd\u30fc\u30c8\u3067UDP\u306e\u5f85\u3061\u53d7\u3051\u3092\u7acb\u3066\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"># \u5225\u7aef\u672b\u3067\u5f85\u3061\u53d7\u3051\nnc -u -l 12399\n<\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">$ nc -vzu -w2 127.0.0.1 12399\nConnection to 127.0.0.1 port 12399 [udp\/*] succeeded!\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f85\u3061\u53d7\u3051\u304c\u3042\u308b\u306e\u3067\u300csucceeded\u300d\u3068\u51fa\u307e\u3057\u305f\u3002\u3053\u3053\u307e\u3067\u306f\u671f\u5f85\u3069\u304a\u308a\u3067\u3059\u3002\u6b21\u306b\u3001\u4f55\u3082\u5f85\u3061\u53d7\u3051\u3066\u3044\u306a\u304412400\u756a\u30dd\u30fc\u30c8\u306b\u5bfe\u3057\u3066\u3001\u307e\u3063\u305f\u304f\u540c\u3058\u30b3\u30de\u30f3\u30c9\u3092\u6253\u3061\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">$ nc -vzu -w2 127.0.0.1 12400\nConnection to 127.0.0.1 port 12400 [udp\/*] succeeded!\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f55\u3082\u5f85\u3061\u53d7\u3051\u3066\u3044\u306a\u3044\u30dd\u30fc\u30c8\u3067\u3082\u300csucceeded\u300d\u3068\u51fa\u307e\u3057\u305f\u3002\u3053\u308c\u3067\u306f\u3001\u305d\u306e\u7d50\u679c\u3092\u898b\u3066\u3082\u30dd\u30fc\u30c8\u304c\u5b9f\u969b\u306b\u958b\u3044\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u5224\u65ad\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u306a\u305c\u3053\u3046\u306a\u308b\u306e\u304b\u3001<code>tcpdump<\/code> \u3067\u30d1\u30b1\u30c3\u30c8\u3092\u8997\u3044\u3066\u78ba\u8a8d\u3057\u307e\u3059\u3002\u4f55\u3082\u5f85\u3061\u53d7\u3051\u3066\u3044\u306a\u3044\u30dd\u30fc\u30c8(12406\u756a)\u306b\u5411\u3051\u3066 <code>nc -vzu<\/code> \u3092\u5b9f\u884c\u3057\u306a\u304c\u3089\u30ad\u30e3\u30d7\u30c1\u30e3\u3059\u308b\u3068\u3001\u6b21\u306e\u3088\u3046\u306b\u8a18\u9332\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">$ sudo tcpdump -i lo0 -n '(udp port 12406) or icmp'\n17:16:29.931248 IP 127.0.0.1.64824 &gt; 127.0.0.1.12406: UDP, length 1\n17:16:29.931262 IP 127.0.0.1.64824 &gt; 127.0.0.1.12406: UDP, length 1\n17:16:29.931267 IP 127.0.0.1.64824 &gt; 127.0.0.1.12406: UDP, length 1\n17:16:29.931271 IP 127.0.0.1.64824 &gt; 127.0.0.1.12406: UDP, length 1\n17:16:29.931276 IP 127.0.0.1 &gt; 127.0.0.1: ICMP 127.0.0.1 udp port 12406 unreachable, length 36\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>nc<\/code> \u306f1\u30d0\u30a4\u30c8\u306e\u63a2\u308a\u30d1\u30b1\u30c3\u30c8\u30924\u56de\u9001\u3063\u3066\u3044\u307e\u3059\u3002\u305d\u3057\u3066\u6700\u5f8c\u306e\u884c\u3092\u898b\u308b\u3068\u3001OS\u306f\u3061\u3083\u3093\u3068\u300cICMP port unreachable\u300d\u3092\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002\u3064\u307e\u308a\u3053\u306e\u74b0\u5883\u3067\u306f\u300c\u9589\u3058\u3066\u3044\u308b\u300d\u3053\u3068\u3092\u793a\u3059\u60c5\u5831\u304c\u3061\u3083\u3093\u3068\u5c4a\u3044\u3066\u3044\u308b\u306e\u306b\u3001<code>nc<\/code> \u5074\u306e\u753b\u9762\u306b\u306f\u300csucceeded\u300d\u3068\u3057\u304b\u51fa\u307e\u305b\u3093\u3067\u3057\u305f\u3002<code>nc -z<\/code> \u306f\u3001UDP\u306b\u5bfe\u3057\u3066\u306f\u9001\u4fe1(<code>write<\/code>\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb)\u304c\u30a8\u30e9\u30fc\u306b\u306a\u3089\u306a\u3051\u308c\u3070\u300csucceeded\u300d\u3068\u8868\u793a\u3059\u308b\u3060\u3051\u3067\u3001ICMP\u306e\u5fdc\u7b54\u3092\u898b\u3066\u5224\u5b9a\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u3088\u3046\u3067\u3059\u3002macOS\u306e <code>man nc<\/code> \u306b\u3082 <code>-z<\/code> \u306f\u300c\u30b9\u30ad\u30e3\u30f3\u3059\u308b\u300d\u3068\u3057\u304b\u66f8\u304b\u308c\u3066\u304a\u3089\u305a\u3001UDP\u3067\u306e\u5224\u5b9a\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u8aac\u660e\u304c\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7d50\u8ad6\u3068\u3057\u3066\u3001<code>nc -vzu<\/code> \u306e\u300csucceeded\u300d\u306f\u300cUDP\u30d1\u30b1\u30c3\u30c8\u306e\u9001\u4fe1\u81ea\u4f53\u306f\u5931\u6557\u3057\u306a\u304b\u3063\u305f\u300d\u3068\u3044\u3046\u7a0b\u5ea6\u306e\u610f\u5473\u3057\u304b\u306a\u304f\u3001\u76f8\u624b\u306e\u30dd\u30fc\u30c8\u304c\u5b9f\u969b\u306b\u958b\u3044\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u306e\u5224\u5b9a\u306b\u306f\u4f7f\u3048\u307e\u305b\u3093\u3002<code>nc<\/code> \u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u81ea\u4f53\u3092\u3082\u3063\u3068\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u5834\u5408\u306f <a href=\"\/memo\/archives\/netcat-udp-usage.html\">netcat(nc)\u3067UDP\u901a\u4fe1\u3059\u308b\u4f7f\u3044\u65b9\u307e\u3068\u3081<\/a> \u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><code>nmap -sU<\/code> \u3067\u78ba\u8a8d\u3059\u308b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u3082\u3046\u5c11\u3057\u8e0f\u307f\u8fbc\u3093\u3067\u78ba\u8a8d\u3057\u305f\u3044\u3068\u304d\u306f <code>nmap<\/code> \u306eUDP\u30b9\u30ad\u30e3\u30f3(<code>-sU<\/code>)\u3092\u4f7f\u3044\u307e\u3059\u3002ICMP\u306e\u5fdc\u7b54\u3092\u5b9f\u969b\u306b\u89e3\u91c8\u3057\u3066 <code>open<\/code> \/ <code>closed<\/code> \/ <code>filtered<\/code> \/ <code>open|filtered<\/code> \u3092\u5224\u5b9a\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">root\u6a29\u9650\u304c\u5fc5\u8981\u3067\u3059\u3002\u4e00\u822c\u30e6\u30fc\u30b6\u30fc\u306e\u307e\u307e\u5b9f\u884c\u3059\u308b\u3068\u3001\u3053\u3046\u8a00\u308f\u308c\u3066\u7d42\u4e86\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">$ nmap -sU -p 12401 127.0.0.1\nYou requested a scan type which requires root privileges.\nQUITTING!\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>sudo<\/code> \u3092\u4ed8\u3051\u3066\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo nmap -sU -p 53,123,161 example.com\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Nmap\u516c\u5f0f\u30de\u30cb\u30e5\u30a2\u30eb\u306b\u3088\u308b\u3068\u3001UDP\u30b9\u30ad\u30e3\u30f3\u306f\u5404\u30dd\u30fc\u30c8\u306bUDP\u30d1\u30b1\u30c3\u30c8\u3092\u9001\u308a\u3001\u8fd4\u3063\u3066\u304d\u305f\u5185\u5bb9\u306b\u3088\u3063\u3066\u6b21\u306e\u3088\u3046\u306b\u72b6\u614b\u3092\u5272\u308a\u5f53\u3066\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u5fdc\u7b54<\/th><th>\u5224\u5b9a\u3055\u308c\u308b\u72b6\u614b<\/th><\/tr><\/thead><tbody><tr><td>\u305d\u306e\u30dd\u30fc\u30c8\u304b\u3089\u4f55\u304bUDP\u306e\u5fdc\u7b54\u304c\u8fd4\u3063\u3066\u304d\u305f(\u307e\u308c)<\/td><td><code>open<\/code><\/td><\/tr><tr><td>ICMP port unreachable(type 3, code 3)<\/td><td><code>closed<\/code><\/td><\/tr><tr><td>\u305d\u306e\u4ed6\u306eICMP\u5230\u9054\u4e0d\u80fd\u30a8\u30e9\u30fc(type 3, code 1, 2, 9, 10, 13\u306a\u3069)<\/td><td><code>filtered<\/code><\/td><\/tr><tr><td>\u518d\u9001\u3057\u3066\u3082\u5fdc\u7b54\u304c\u7121\u3044<\/td><td><code>open|filtered<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><code>filtered<\/code> \u306f\u3055\u3089\u306b\u3001<code>type 3 code 13<\/code>(\u901a\u4fe1\u304c\u7ba1\u7406\u4e0a\u7981\u6b62\u3055\u308c\u3066\u3044\u308b)\u306e\u3088\u3046\u306a\u660e\u793a\u7684\u306a\u62d2\u5426ICMP\u304c\u8fd4\u3063\u3066\u304d\u305f\u5834\u5408\u3092\u542b\u307f\u307e\u3059\u3002\u305f\u3060\u3057\u30de\u30cb\u30e5\u30a2\u30eb\u3082\u300c\u5358\u306b\u30d7\u30ed\u30fc\u30d6\u3092\u9ed9\u3063\u3066\u6368\u3066\u308b\u30d5\u30a3\u30eb\u30bf\u306e\u65b9\u304c\u305a\u3063\u3068\u591a\u3044\u300d\u3068\u66f8\u3044\u3066\u304a\u308a\u3001\u5fdc\u7b54\u304c\u7121\u3044\u30b1\u30fc\u30b9\u306e\u5927\u534a\u306f\u7d50\u5c40 <code>open|filtered<\/code> \u306b\u843d\u3061\u7740\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5224\u5b9a\u306e\u6839\u62e0\u3092\u77e5\u308a\u305f\u3044\u3068\u304d\u306f <code>--reason<\/code> \u3092\u4ed8\u3051\u308b\u3068\u3001\u3069\u306e\u30d1\u30b1\u30c3\u30c8(ICMP\u306e\u7a2e\u985e\u306a\u3069)\u3067\u72b6\u614b\u304c\u6c7a\u307e\u3063\u305f\u304b\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo nmap -sU -p 53,123,161 --reason example.com\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>open|filtered<\/code> \u306e\u307e\u307e\u5224\u65ad\u304c\u3064\u304b\u306a\u3044\u5834\u5408\u3001<code>-sV<\/code>(\u30b5\u30fc\u30d3\u30b9\/\u30d0\u30fc\u30b8\u30e7\u30f3\u691c\u51fa)\u3092\u4f75\u7528\u3059\u308b\u3068\u3001\u5b9f\u969b\u306b\u305d\u306e\u30b5\u30fc\u30d3\u30b9\u5411\u3051\u306e\u30d7\u30ed\u30fc\u30d6\u3092\u9001\u3063\u3066\u5fdc\u7b54\u3092\u5f15\u304d\u51fa\u305b\u308b\u3053\u3068\u304c\u3042\u308a\u3001<code>open<\/code> \u304b\u3069\u3046\u304b\u306e\u5207\u308a\u5206\u3051\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo nmap -sU -sV -p 53,123,161 example.com\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">UDP\u30b9\u30ad\u30e3\u30f3\u304c\u9045\u3044\u306e\u3082\u3053\u306e\u4ed5\u7d44\u307f\u304c\u7406\u7531\u3067\u3059\u3002Nmap\u516c\u5f0f\u30de\u30cb\u30e5\u30a2\u30eb\u306f\u3001\u591a\u304f\u306eOS\u304cICMP\u5230\u9054\u4e0d\u80fd\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u9001\u51fa\u3092\u30ec\u30fc\u30c8\u5236\u9650\u3057\u3066\u304a\u308a(Linux\u306f1\u79d2\u3042\u305f\u308a1\u500b\u307e\u3067\u306a\u3069)\u3001Nmap\u5074\u3082\u305d\u308c\u3092\u691c\u51fa\u3057\u3066\u9001\u4fe1\u9593\u9694\u3092\u843d\u3068\u3059\u305f\u3081\u300165536\u30dd\u30fc\u30c8\u5168\u4f53\u306e\u30b9\u30ad\u30e3\u30f3\u306b\u306f18\u6642\u9593\u4ee5\u4e0a\u304b\u304b\u308a\u3046\u308b\u3068\u8aac\u660e\u3057\u3066\u3044\u307e\u3059\u3002\u30dd\u30fc\u30c8\u3092\u7d5e\u3063\u3066(<code>-p<\/code>)\u4f7f\u3046\u306e\u304c\u73fe\u5b9f\u7684\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30a2\u30d7\u30ea\u5c64\u3067\u78ba\u8a8d\u3059\u308b:\u4e00\u756a\u78ba\u5b9f\u306a\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u3053\u307e\u3067\u306e\u65b9\u6cd5\u306f\u3044\u305a\u308c\u3082\u300c\u958b\u3044\u3066\u3044\u308b\u3089\u3057\u3044\u300d\u307e\u3067\u3057\u304b\u5206\u304b\u308a\u307e\u305b\u3093\u3002\u4e00\u756a\u78ba\u5b9f\u306a\u306e\u306f\u3001\u305d\u306e\u30dd\u30fc\u30c8\u3067\u52d5\u3044\u3066\u3044\u308b\u306f\u305a\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u6b63\u898f\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u5b9f\u969b\u306b\u9001\u308a\u3001\u6b63\u898f\u306e\u5fdc\u7b54\u304c\u8fd4\u3063\u3066\u304f\u308b\u304b\u3092\u898b\u308b\u3053\u3068\u3067\u3059\u3002\u76f8\u624b\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u6b63\u3057\u304f\u5fdc\u7b54\u3059\u308c\u3070\u3001\u30dd\u30fc\u30c8\u304c\u958b\u3044\u3066\u3044\u3066\u3001\u304b\u3064\u30b5\u30fc\u30d3\u30b9\u304c\u6b63\u5e38\u306b\u52d5\u3044\u3066\u3044\u308b\u3053\u3068\u307e\u3067\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8eab\u8fd1\u306a\u4f8b\u306fDNS(UDP\/53)\u3067\u3059\u3002<code>dig<\/code> \u3067\u554f\u3044\u5408\u308f\u305b\u3066\u3001\u5fdc\u7b54\u304c\u8fd4\u3063\u3066\u304f\u308c\u3070\u758e\u901a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">$ dig +short example.com A\n104.20.23.154\n172.66.147.243\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u81ea\u4f5c\u306eUDP\u30b5\u30fc\u30d3\u30b9\u3092\u78ba\u8a8d\u3057\u305f\u3044\u3068\u304d\u3082\u8003\u3048\u65b9\u306f\u540c\u3058\u3067\u3059\u3002\u305d\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u304c\u671f\u5f85\u3059\u308b\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u9001\u308a\u3001\u671f\u5f85\u3059\u308b\u5fdc\u7b54\u304c\u8fd4\u3063\u3066\u304f\u308b\u304b\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\u3067\u898b\u3066\u304f\u3060\u3055\u3044\u3002<code>nc -u<\/code> \u3067\u3082\u751f\u306e\u30d0\u30a4\u30c8\u5217\u3092\u9001\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u3059\u304c\u3001\u76f8\u624b\u304c\u671f\u5f85\u3059\u308b\u5f62\u5f0f\u306e\u30c7\u30fc\u30bf\u3092\u9001\u3089\u306a\u3044\u3068\u5fdc\u7b54\u306f\u8fd4\u308a\u307e\u305b\u3093\u3002\u624b\u3063\u53d6\u308a\u65e9\u304f\u9001\u53d7\u4fe1\u3060\u3051\u8a66\u3057\u305f\u3044\u5834\u5408\u306e <code>nc -u<\/code> \u306e\u57fa\u672c\u306f <a href=\"\/memo\/archives\/udp-connection-on-command-line.html\">\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u3067UDP\u901a\u4fe1\u3092\u8a66\u3059\u65b9\u6cd5<\/a> \u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30b5\u30fc\u30d0\u5074\u3067\u5f85\u3061\u53d7\u3051\u72b6\u614b\u3092\u78ba\u8a8d\u3059\u308b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u81ea\u5206\u304c\u7ba1\u7406\u3057\u3066\u3044\u308b\u30b5\u30fc\u30d0\u306a\u3089\u3001\u5916\u304b\u3089\u63a2\u308b\u3088\u308a\u3001\u30b5\u30fc\u30d0\u4e0a\u3067\u30d7\u30ed\u30bb\u30b9\u304c\u5b9f\u969b\u306b\u305d\u306e\u30dd\u30fc\u30c8\u3092bind\u3057\u3066\u5f85\u3063\u3066\u3044\u308b\u304b\u3092\u898b\u308b\u307b\u3046\u304c\u78ba\u5b9f\u3067\u3059\u3002\u30b3\u30de\u30f3\u30c9\u306fOS\u306b\u3088\u3063\u3066\u9055\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Linux: <code>ss -ulnp<\/code><\/h4>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo ss -ulnp\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>-u<\/code> \u3067UDP\u3001<code>-l<\/code> \u3067\u5f85\u3061\u53d7\u3051\u30bd\u30b1\u30c3\u30c8\u306e\u307f\u3001<code>-n<\/code> \u3067\u540d\u524d\u89e3\u6c7a\u3092\u305b\u305a\u3001<code>-p<\/code> \u3067\u30d7\u30ed\u30bb\u30b9\u540d\/PID\u307e\u3067\u8868\u793a\u3057\u307e\u3059\u3002\u624b\u5143\u306emacOS\u306b\u306f <code>ss<\/code> \u30b3\u30de\u30f3\u30c9\u304c\u7121\u3044\u305f\u3081\u5b9f\u6a5f\u78ba\u8a8d\u306f\u3057\u3066\u3044\u307e\u305b\u3093\u304c\u3001\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u610f\u5473\u306f <code>ss<\/code> \u306e\u516c\u5f0fman(iproute2)\u3067\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">macOS: <code>lsof -iUDP -nP<\/code><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u624b\u5143\u306712402\u756a\u30dd\u30fc\u30c8\u306b <code>nc -u -l<\/code> \u306e\u5f85\u3061\u53d7\u3051\u3092\u7acb\u3066\u3066\u78ba\u8a8d\u3059\u308b\u3068\u3001\u6b21\u306e\u3088\u3046\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">$ lsof -iUDP -nP\nCOMMAND     PID USER   FD   TYPE             DEVICE SIZE\/OFF NODE NAME\nnc        99627   mi    3u  IPv4 0x7bfb8db5b7850a5b      0t0  UDP *:12402\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>UDP *:12402<\/code> \u306e\u884c\u304c\u3001\u305d\u306e\u30dd\u30fc\u30c8\u3092OS\u30ec\u30d9\u30eb\u3067\u8ab0\u304b\u304c\u5f85\u3061\u53d7\u3051\u3066\u3044\u308b\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Windows: <code>Get-NetUDPEndpoint<\/code> \/ <code>netstat -an -p UDP<\/code><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Windows\u3067\u306f <code>ss<\/code> \u3082 <code>lsof<\/code> \u3082\u4f7f\u3048\u307e\u305b\u3093\u3002PowerShell\u306e <code>Get-NetUDPEndpoint<\/code> \u304b <code>netstat -an -p UDP<\/code> \u3067\u5f85\u3061\u53d7\u3051\u30dd\u30fc\u30c8\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002UDP\u306e\u9001\u53d7\u4fe1\u81ea\u4f53(<code>Test-NetConnection<\/code> \u304cUDP\u306b\u4f7f\u3048\u306a\u3044\u70b9\u3082\u542b\u3080)\u306f <a href=\"\/memo\/archives\/windows-udp-command.html\">Windows\u3067UDP\u901a\u4fe1\u30fb\u30dd\u30fc\u30c8\u78ba\u8a8d\u3092\u3059\u308b\u65b9\u6cd5<\/a> \u306b\u307e\u3068\u3081\u3066\u3044\u308b\u306e\u3067\u3001\u305d\u3061\u3089\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u5171\u901a\u306e\u6ce8\u610f\u70b9<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u3044\u305a\u308c\u306e\u65b9\u6cd5\u3082\u3001\u3042\u304f\u307e\u3067\u300c\u81ea\u5206\u306e\u30de\u30b7\u30f3\u306e\u4e2d\u3067\u30d7\u30ed\u30bb\u30b9\u304c\u30dd\u30fc\u30c8\u3092\u63b4\u3093\u3067\u3044\u308b\u304b\u300d\u306e\u78ba\u8a8d\u3067\u3059\u3002\u5916\u90e8\u304b\u3089\u305d\u306e\u30dd\u30fc\u30c8\u306b\u5b9f\u969b\u306b\u5c4a\u304f\u304b\u3069\u3046\u304b\u306f\u3001\u9014\u4e2d\u306e\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3084\u30eb\u30fc\u30bf\u30fc\u306e\u8a2d\u5b9a\u306b\u5de6\u53f3\u3055\u308c\u308b\u306e\u3067\u5225\u554f\u984c\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30b1\u30c3\u30c8\u304c\u5b9f\u969b\u306b\u5c4a\u3044\u305f\u304b\u306f <code>tcpdump<\/code> \u3067\u898b\u308b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u300c\u9001\u3063\u305f\u306f\u305a\u306a\u306e\u306b\u5fdc\u7b54\u304c\u7121\u3044\u300d\u3068\u304d\u306e\u5207\u308a\u5206\u3051\u306b\u306f <code>tcpdump<\/code> \u304c\u6709\u52b9\u3067\u3059\u3002\u53d7\u4fe1\u5074\u306e\u30b5\u30fc\u30d0\u3067\u5bfe\u8c61\u30dd\u30fc\u30c8\u3092\u76e3\u8996\u3057\u3066\u304a\u304d\u3001\u9001\u4fe1\u5074\u304b\u3089\u30c7\u30fc\u30bf\u3092\u9001\u3063\u3066\u30d1\u30b1\u30c3\u30c8\u304c\u5230\u9054\u3057\u3066\u3044\u308b\u304b\u3092\u76f4\u63a5\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sudo tcpdump -i eth0 -n udp port 12345\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u624b\u5143\u3067\u3082\u5b9f\u969b\u306b\u9001\u53d7\u4fe1\u3057\u3066\u78ba\u8a8d\u3057\u307e\u3057\u305f\u300212404\u756a\u30dd\u30fc\u30c8\u306b\u4f55\u3082\u5f85\u3061\u53d7\u3051\u3066\u3044\u306a\u3044\u72b6\u614b\u3067 <code>tcpdump<\/code> \u3092\u4ed5\u639b\u3051\u3066\u304b\u3089 <code>nc -u<\/code> \u3067\u30c7\u30fc\u30bf\u3092\u9001\u308b\u3068\u3001\u30d1\u30b1\u30c3\u30c8\u81ea\u4f53\u306f\u3061\u3083\u3093\u3068\u51fa\u3066\u3044\u304f\u306e\u304c\u898b\u3048\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">$ sudo tcpdump -i lo0 -n udp port 12404\n17:15:39.785945 IP 127.0.0.1.49984 &gt; 127.0.0.1.12404: UDP, length 6\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u9001\u4fe1\u5143\u304c\u30d1\u30b1\u30c3\u30c8\u3092\u9001\u308a\u51fa\u305b\u305f\u3053\u3068\u3068\u3001\u76f8\u624b\u306b\u5c4a\u3044\u3066\u51e6\u7406\u3055\u308c\u305f\u3053\u3068\u306f\u5225\u3067\u3059\u3002\u53d7\u4fe1\u5074\u3067\u30d1\u30b1\u30c3\u30c8\u304c\u8a18\u9332\u3055\u308c\u3066\u3044\u308b\u306a\u3089\u3001\u5c11\u306a\u304f\u3068\u3082\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7d4c\u8def\u4e0a\u306f\u5c4a\u3044\u3066\u3044\u307e\u3059\u3002\u305d\u3053\u304b\u3089\u5148\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u6b63\u3057\u304f\u51e6\u7406\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u306f\u3001\u30a2\u30d7\u30ea\u5c64\u3067\u306e\u78ba\u8a8d(\u524d\u8ff0)\u3067\u8ffd\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u307e\u3068\u3081<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u78ba\u8a8d\u3057\u305f\u3044\u3053\u3068<\/th><th>\u4f7f\u3046\u3082\u306e<\/th><th>\u5206\u304b\u308b\u3053\u3068<\/th><th>\u9650\u754c<\/th><\/tr><\/thead><tbody><tr><td>\u3068\u308a\u3042\u3048\u305a\u8a66\u3059<\/td><td><code>nc -vzu<\/code><\/td><td>UDP\u30d1\u30b1\u30c3\u30c8\u306e\u9001\u4fe1\u81ea\u4f53\u304c\u5931\u6557\u3057\u306a\u304b\u3063\u305f\u304b<\/td><td>\u5224\u5b9a\u306b\u4f7f\u3048\u306a\u3044(\u5e38\u306bsucceeded\u306b\u306a\u308a\u304c\u3061)<\/td><\/tr><tr><td>\u3042\u308b\u7a0b\u5ea6\u4f53\u7cfb\u7684\u306b\u78ba\u8a8d<\/td><td><code>nmap -sU<\/code>(\u8981root)<\/td><td>open\/closed\/filtered\/open|filtered\u306e\u5224\u5b9a<\/td><td>\u5fdc\u7b54\u304c\u7121\u3044\u3068<code>open\\|filtered<\/code>\u6b62\u307e\u308a\u3002\u9045\u3044<\/td><\/tr><tr><td>\u4e00\u756a\u78ba\u5b9f\u306a\u78ba\u8a8d<\/td><td>\u30a2\u30d7\u30ea\u5c64\u3067\u306e\u5b9f\u969b\u306e\u3084\u308a\u53d6\u308a(<code>dig<\/code>\u306a\u3069)<\/td><td>\u30b5\u30fc\u30d3\u30b9\u304c\u672c\u5f53\u306b\u52d5\u3044\u3066\u3044\u308b\u304b<\/td><td>\u305d\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u6b63\u898f\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u77e5\u3063\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308b<\/td><\/tr><tr><td>\u81ea\u5206\u306e\u30b5\u30fc\u30d0\u306e\u5f85\u53d7\u78ba\u8a8d<\/td><td><code>ss -ulnp<\/code>(Linux) \/ <code>lsof -iUDP -nP<\/code>(macOS) \/ <code>Get-NetUDPEndpoint<\/code>(Windows)<\/td><td>\u30d7\u30ed\u30bb\u30b9\u304c\u30dd\u30fc\u30c8\u3092\u63b4\u3093\u3067\u3044\u308b\u304b<\/td><td>\u5916\u90e8\u304b\u3089\u306e\u5230\u9054\u6027\u306f\u5225\u554f\u984c<\/td><\/tr><tr><td>\u30d1\u30b1\u30c3\u30c8\u304c\u5c4a\u3044\u305f\u304b\u306e\u78ba\u8a8d<\/td><td><code>tcpdump<\/code><\/td><td>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7d4c\u8def\u4e0a\u30d1\u30b1\u30c3\u30c8\u304c\u5230\u9054\u3057\u305f\u304b<\/td><td>\u30a2\u30d7\u30ea\u306e\u51e6\u7406\u7d50\u679c\u307e\u3067\u306f\u5206\u304b\u3089\u306a\u3044<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u3042\u308f\u305b\u3066\u8aad\u307f\u305f\u3044<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"\/memo\/archives\/udp-connection-on-command-line.html\">\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u3067UDP\u901a\u4fe1\u3092\u8a66\u3059\u65b9\u6cd5<\/a>(telnet\u304c\u4f7f\u3048\u306a\u3044\u7406\u7531\u3068<code>nc<\/code>\u3067\u306e\u57fa\u672c\u7684\u306a\u9001\u53d7\u4fe1)<\/li>\n\n\n\n<li><a href=\"\/memo\/archives\/netcat-udp-usage.html\">netcat(nc)\u3067UDP\u901a\u4fe1\u3059\u308b\u4f7f\u3044\u65b9\u307e\u3068\u3081<\/a>(<code>-u<\/code> <code>-l<\/code> <code>-v<\/code> <code>-w<\/code> <code>-z<\/code> \u306a\u3069\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u3068\u7cfb\u7d71\u5dee)<\/li>\n\n\n\n<li><a href=\"\/memo\/archives\/windows-udp-command.html\">Windows\u3067UDP\u901a\u4fe1\u30fb\u30dd\u30fc\u30c8\u78ba\u8a8d\u3092\u3059\u308b\u65b9\u6cd5<\/a>(PowerShell\u3084ncat\u3067\u306e\u4ee3\u66ff\u624b\u6bb5)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u3055\u3044\u3054\u306b<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>UDP\u306f\u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u30ec\u30b9\u306a\u306e\u3067\u3001\u300c\u7121\u53cd\u5fdc\u300d\u3060\u3051\u3067\u306f\u958b\u3044\u3066\u3044\u308b\u304b\u9589\u3058\u3066\u3044\u308b\u304b\u5224\u5b9a\u3067\u304d\u307e\u305b\u3093\u3002\u3053\u308c\u304cTCP\u3068\u306e\u6839\u672c\u7684\u306a\u9055\u3044\u3067\u3059\u3002<\/li>\n\n\n\n<li><code>nc -vzu<\/code> \u306e\u300csucceeded\u300d\u306f\u9001\u4fe1\u304c\u5931\u6557\u3057\u306a\u304b\u3063\u305f\u3060\u3051\u306e\u610f\u5473\u3067\u3001\u30dd\u30fc\u30c8\u306e\u72b6\u614b\u3092\u4fdd\u8a3c\u3057\u307e\u305b\u3093\u3002<\/li>\n\n\n\n<li>\u4f53\u7cfb\u7684\u306b\u78ba\u8a8d\u3057\u305f\u3044\u306a\u3089 <code>nmap -sU<\/code>\u3001\u78ba\u5b9f\u306b\u78ba\u8a8d\u3057\u305f\u3044\u306a\u3089\u30a2\u30d7\u30ea\u5c64\u3067\u5b9f\u969b\u306b\u3084\u308a\u53d6\u308a\u3059\u308b\u3001\u81ea\u5206\u306e\u30b5\u30fc\u30d0\u306a\u3089 <code>ss<\/code>\/<code>lsof<\/code> \u3067\u5f85\u53d7\u3092\u76f4\u63a5\u898b\u308b\u3001\u3068\u4f7f\u3044\u5206\u3051\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7d50\u8ad6\u304b\u3089\u8a00\u3046\u3068\u3001UDP\u306e\u30dd\u30fc\u30c8\u304c\u958b\u3044\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u306f100%\u78ba\u5b9f\u306b\u306f\u78ba\u8a8d\u3067\u304d\u307e\u305b\u3093\u3002TCP\u306e\u30dd\u30fc\u30c8\u78ba\u8a8d\u3068\u306f\u524d\u63d0\u304c\u307e\u3063\u305f\u304f\u9055\u3046\u304b\u3089\u3067\u3059\u3002\u305d\u308c\u3067\u3082\u5b9f\u7528\u4e0a\u300c\u958b\u3044\u3066\u3044\u305d\u3046\u300d\u300c\u9589\u3058\u3066\u3044\u305d\u3046\u300d\u3092\u5224\u65ad\u3059\u308b\u624b\u6bb5\u306f\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u8a18 &hellip; <a href=\"https:\/\/www.ecoop.net\/memo\/archives\/udp-port-check.html\" class=\"more-link\">\u7d9a\u304d\u3092\u8aad\u3080 <span class=\"screen-reader-text\">UDP\u30dd\u30fc\u30c8\u304c\u958b\u3044\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3059\u308b\u65b9\u6cd5\u3068\u3001\u306a\u305c\u96e3\u3057\u3044\u306e\u304b<\/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":[135,155],"tags":[161],"class_list":["post-1378","post","type-post","status-publish","format-standard","hentry","category-server","category-dev","tag-udp"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts\/1378","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/comments?post=1378"}],"version-history":[{"count":1,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts\/1378\/revisions"}],"predecessor-version":[{"id":1379,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/posts\/1378\/revisions\/1379"}],"wp:attachment":[{"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/media?parent=1378"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/categories?post=1378"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ecoop.net\/memo\/wp-json\/wp\/v2\/tags?post=1378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}