ICMP\uff08Internet Control Message Protocol\uff09\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u554f\u984c\u3092\u5831\u544a\u3057\u305f\u308a\u30b9\u30c6\u30fc\u30bf\u30b9\u66f4\u65b0\u3092\u5171\u6709\u3057\u305f\u308a\u3059\u308b\u305f\u3081\u306b\u30c7\u30d0\u30a4\u30b9\u304c\u4f7f\u7528\u3059\u308b\u901a\u4fe1\u30c4\u30fc\u30eb\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u3002\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u304b\u3063\u305f\u308a\u3001\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u304c\u591a\u3059\u304e\u3066\u9045\u5ef6\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306a\u3069\u3001\u554f\u984c\u304c\u3042\u308b\u3068\u304d\u306b\u30c7\u30d0\u30a4\u30b9\u540c\u58eb\u3067\u77e5\u3089\u305b\u5408\u3046\u3053\u3068\u3067\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u52a9\u3051\u307e\u3059\u3002\u5b9f\u306fICMP\u306f\u77e5\u3089\u305a\u77e5\u3089\u305a\u306e\u3046\u3061\u306b\u4f7f\u308f\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\uff01ping\u3084traceroute\u306e\u80cc\u5f8c\u306b\u3042\u308b\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3042\u308a\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u554f\u984c\u3092\u628a\u63e1\u3057\u3084\u3059\u304f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>

\u300cping\u300d\u3068\u3044\u3046\u7528\u8a9e\u306f\u3001\u901a\u5e38\u3001ICMP\uff08Internet Control Message Protocol\uff09\u3092\u5229\u7528\u3057\u3066\u6a5f\u80fd\u3059\u308b\u5358\u72ec\u306e\u30b3\u30de\u30f3\u30c9\u3092\u6307\u3057\u307e\u3059\u3002\u95a2\u4fc2\u6027\u3092\u660e\u78ba\u306b\u3059\u308b\u305f\u3081\u306b\u4ee5\u4e0b\u306b\u5206\u89e3\u3057\u307e\u3059\uff1a<\/p>

• Ping\u30b3\u30de\u30f3\u30c9\uff1a<\/strong>
  • \u5358\u72ec\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\uff1a<\/strong>ping\u30b3\u30de\u30f3\u30c9\u306f\u3001\u591a\u304f\u306eOS\uff08Windows\u3001Linux\u3001macOS\uff09\u3067\u5229\u7528\u53ef\u80fd\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a3a\u65ad\u7528\u306e\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u3067\u3059\u3002<\/li>
  • \u4f7f\u3044\u65b9\uff1a<\/strong>\u30db\u30b9\u30c8\u540d\u3084IP\u30a2\u30c9\u30ec\u30b9\uff08\u4f8b\uff1aping example.com\uff09\u3092\u7d9a\u3051\u3066\u5165\u529b\u3059\u308b\u3068\u3001\u6307\u5b9a\u3057\u305f\u30bf\u30fc\u30b2\u30c3\u30c8\u306bICMP Echo Request\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9001\u4fe1\u3057\u307e\u3059\u3002<\/li><\/ul><\/li>
  • ICMP Ping\uff1a<\/strong>
    • \u57fa\u76e4\u30d7\u30ed\u30c8\u30b3\u30eb\uff1a<\/strong>\u300cICMP ping\u300d\u306fping\u30b3\u30de\u30f3\u30c9\u304c\u52d5\u4f5c\u3059\u308b\u4ed5\u7d44\u307f\u3092\u6307\u3057\u307e\u3059\u3002ping\u30b3\u30de\u30f3\u30c9\u306fICMP\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u4f7f\u7528\u3057\u3066Echo Request\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9001\u4fe1\u3057\u3001Echo Reply\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002<\/li>
    • \u6280\u8853\u7684\u8a73\u7d30\uff1a<\/strong>ICMP\u30d7\u30ed\u30c8\u30b3\u30eb\u306f\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30d7\u30ed\u30c8\u30b3\u30eb\u30b9\u30a4\u30fc\u30c8\u306e\u4e00\u90e8\u3067\u3001\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3084\u901a\u4fe1\u306e\u6210\u529f\u30fb\u5931\u6557\u3092\u793a\u3059\u904b\u7528\u60c5\u5831\u3092\u5225\u306eIP\u30a2\u30c9\u30ec\u30b9\u3068\u901a\u4fe1\u3059\u308b\u969b\u306b\u9001\u4fe1\u3057\u307e\u3059\u3002<\/li><\/ul><\/li><\/ul>

      \u307e\u3068\u3081\u308b\u3068\u3001ping\u30b3\u30de\u30f3\u30c9\u306f\u4f7f\u7528\u3059\u308b\u30c4\u30fc\u30eb\u3067\u3042\u308a\u3001ICMP\u306f\u305d\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5230\u9054\u6027\u30c6\u30b9\u30c8\u3092\u5b9f\u884c\u3059\u308b\u305f\u3081\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3059\u3002<\/p>

      \u901a\u5e38\u300cping\u300d\u3068\u8a00\u3046\u3068\u5358\u72ec\u306e\u30b3\u30de\u30f3\u30c9\u3092\u6307\u3057\u307e\u3059\u304c\u3001\u3053\u306e\u30b3\u30de\u30f3\u30c9\u304cICMP\u3092\u5229\u7528\u3057\u3066\u52d5\u4f5c\u3057\u3066\u3044\u308b\u3053\u3068\u306f\u7406\u89e3\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>

      ICMP\u306e\u6a5f\u80fd<\/h2>

      ICMP\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u95a2\u9023\u30bf\u30b9\u30af\u306b\u4f7f\u308f\u308c\u307e\u3059\uff1a<\/p>

      • \u30a8\u30e9\u30fc\u5831\u544a\uff1a<\/strong>ICMP\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u901a\u4fe1\u306e\u30a8\u30e9\u30fc\u3092\u5831\u544a\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u30eb\u30fc\u30bf\u30fc\u304c\u30d1\u30b1\u30c3\u30c8\u3092\u8ee2\u9001\u3067\u304d\u306a\u3044\u5834\u5408\u306f\u300cDestination Unreachable\uff08\u5b9b\u5148\u5230\u9054\u4e0d\u80fd\uff09\u300d\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9001\u4fe1\u5143\u30db\u30b9\u30c8\u306b\u8fd4\u3057\u307e\u3059\u3002<\/li>
      • \u8a3a\u65ad\uff1a<\/strong>ICMP\u306fping\u3084traceroute<\/a>\u306a\u3069\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a3a\u65ad\u30c4\u30fc\u30eb\u3067\u4f7f\u308f\u308c\u3001\u63a5\u7d9a\u6027\u306e\u30c6\u30b9\u30c8\u3084\u30d1\u30b1\u30c3\u30c8\u7d4c\u8def\u306e\u8ffd\u8de1\u3092\u652f\u63f4\u3057\u307e\u3059\u3002<\/li>
      • \u30d5\u30ed\u30fc\u5236\u5fa1\uff1a<\/strong>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u6df7\u96d1\u6642\u306b\u300cSource Quench\u300d\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9001\u308b\u3053\u3068\u3067\u9001\u4fe1\u5143\u304b\u3089\u306e\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u6291\u5236\u3059\u308b\u306e\u306b\u3082\u5f79\u7acb\u3061\u307e\u3059\u3002<\/li><\/ul>

        ICMP\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u7a2e\u985e<\/h2>

        ICMP\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u3044\u304f\u3064\u304b\u306e\u30bf\u30a4\u30d7\u306b\u5206\u304b\u308c\u3001\u5404\u30bf\u30a4\u30d7\u306f\u7279\u5b9a\u306e\u76ee\u7684\u306b\u7528\u3044\u3089\u308c\u307e\u3059\u3002\u4e00\u822c\u7684\u306a\u30bf\u30a4\u30d7\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>

        • Echo Request \u3068 Echo Reply\uff08\u30bf\u30a4\u30d78\u3068\u30bf\u30a4\u30d70\uff09\uff1a<\/strong>ping\u30b3\u30de\u30f3\u30c9\u304c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u63a5\u7d9a\u6027\u3092\u30c6\u30b9\u30c8\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/li>
        • Destination Unreachable\uff08\u30bf\u30a4\u30d73\uff09\uff1a<\/strong>\u30d1\u30b1\u30c3\u30c8\u304c\u5b9b\u5148\u306b\u5230\u9054\u3067\u304d\u306a\u3044\u3053\u3068\u3092\u793a\u3057\u307e\u3059\u3002<\/li>
        • Source Quench\uff08\u30bf\u30a4\u30d74\uff09\uff1a<\/strong>\u6df7\u96d1\u306e\u305f\u3081\u9001\u4fe1\u7387\u3092\u6e1b\u3089\u3059\u3088\u3046\u9001\u4fe1\u8005\u306b\u8981\u6c42\u3057\u307e\u3059\u3002<\/li>
        • Redirect\uff08\u30bf\u30a4\u30d75\uff09\uff1a<\/strong>\u30db\u30b9\u30c8\u306b\u5225\u7d4c\u8def\u3092\u4f7f\u3046\u3088\u3046\u901a\u77e5\u3057\u307e\u3059\u3002<\/li>
        • Time Exceeded\uff08\u30bf\u30a4\u30d711\uff09\uff1a<\/strong>\u30d1\u30b1\u30c3\u30c8\u306eTTL\uff08Time to Live\uff09\u304c\u671f\u9650\u5207\u308c\u306b\u306a\u3063\u305f\u3053\u3068\u3092\u793a\u3057\u307e\u3059\u3002<\/li><\/ul>

          Ping\u306e\u7406\u89e3<\/h2>

          ping\u30b3\u30de\u30f3\u30c9\u306f\u3001IP\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306e\u30db\u30b9\u30c8\u3078\u306e\u5230\u9054\u53ef\u80fd\u6027\u3092\u30c6\u30b9\u30c8\u3059\u308b\u305f\u3081\u306e\u5e83\u304f\u4f7f\u308f\u308c\u3066\u3044\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a3a\u65ad\u30c4\u30fc\u30eb\u3067\u3059\u3002ICMP Echo Request\u30e1\u30c3\u30bb\u30fc\u30b8\uff08ICMP\u30d1\u30b1\u30c3\u30c8\uff09\u3092\u30bf\u30fc\u30b2\u30c3\u30c8\u30db\u30b9\u30c8\u306b\u9001\u308a\u3001Echo Reply\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u5f85\u3061\u307e\u3059\u3002<\/p>

          Ping\u306e\u52d5\u4f5c<\/h2>

          • Echo Request\u306e\u9001\u4fe1\uff1a<\/strong>ping\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u30c7\u30d0\u30a4\u30b9\u306f\u30bf\u30fc\u30b2\u30c3\u30c8\u30db\u30b9\u30c8\u306bICMP Echo Request\u30e1\u30c3\u30bb\u30fc\u30b8\uff08ping\u30ea\u30af\u30a8\u30b9\u30c8\uff09\u3092\u9001\u4fe1\u3057\u307e\u3059\u3002<\/li>
          • Echo Reply\u306e\u53d7\u4fe1\uff1a<\/strong>\u30bf\u30fc\u30b2\u30c3\u30c8\u30db\u30b9\u30c8\u306fEcho Request\u3092\u53d7\u3051\u53d6\u308a\u3001ICMP Echo Reply\u30e1\u30c3\u30bb\u30fc\u30b8\u3067\u5fdc\u7b54\u3057\u307e\u3059\u3002<\/li>
          • \u5f80\u5fa9\u6642\u9593\u306e\u8a08\u6e2c\uff1a<\/strong>ping\u306fEcho Request\u304c\u30bf\u30fc\u30b2\u30c3\u30c8\u306b\u5c4a\u304dEcho Reply\u304c\u8fd4\u3063\u3066\u304f\u308b\u307e\u3067\u306e\u6642\u9593\uff08\u5f80\u5fa9\u6642\u9593\uff1aRTT\uff09\u3092\u6e2c\u5b9a\u3057\u307e\u3059\u3002<\/li><\/ul>

            Ping\u30b3\u30de\u30f3\u30c9\u306e\u4f7f\u3044\u65b9<\/h2>

            ping<\/span>\u30b3\u30de\u30f3\u30c9\u306f\u4f7f\u3044\u3084\u3059\u304f\u3001\u307b\u3068\u3093\u3069\u306eOS\u3067\u5229\u7528\u53ef\u80fd\u3067\u3059\u3002<\/p>

            \u4f7f\u7528\u4f8b\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>

            Windows\/Linux\/Mac \u30b3\u30de\u30f3\u30c9\u30d7\u30ed\u30f3\u30d7\u30c8\uff1a<\/h3>

            ping example.com<\/span><\/p>

            ping<\/span>\u30b3\u30de\u30f3\u30c9\u5b9f\u884c\u6642\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u51fa\u529b\u304c\u8868\u793a\u3055\u308c\u307e\u3059\uff1a<\/p>

            Pinging example.com [93.184.216.34] with 32 bytes of data:<\/span><\/p>

            Reply from 93.184.216.34: bytes=32 time=24ms TTL=52<\/span><\/p>

            Reply from 93.184.216.34: bytes=32 time=25ms TTL=52<\/span><\/p>

            Reply from 93.184.216.34: bytes=32 time=24ms TTL=52<\/span><\/p>

            Reply from 93.184.216.34: bytes=32 time=25ms TTL=52<\/span><\/p>

            Ping statistics for 93.184.216.34:<\/span><\/p>

            Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),<\/span><\/p>

            Approximate round trip times in milli-seconds:<\/span><\/p>

            Minimum = 24ms, Maximum = 25ms, Average = 24ms<\/span><\/p>

            Ping\u7d50\u679c\u306e\u89e3\u91c8<\/h3>

            • \u9001\u53d7\u4fe1\u30d1\u30b1\u30c3\u30c8\u6570\uff1a<\/strong>\u9001\u4fe1\u3055\u308c\u305fICMP Echo Request\u306e\u6570\u3068\u53d7\u4fe1\u3057\u305fEcho Reply\u306e\u6570\u3092\u793a\u3057\u307e\u3059\u3002\u30d1\u30b1\u30c3\u30c8\u640d\u5931\u304c\u591a\u3044\u3068\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u554f\u984c\u3092\u793a\u5506\u3057\u307e\u3059\u3002<\/li>
            • \u5f80\u5fa9\u6642\u9593\uff08RTT\uff09\uff1a<\/strong>\u30d1\u30b1\u30c3\u30c8\u304c\u76ee\u7684\u5730\u306b\u884c\u304d\u623b\u308b\u307e\u3067\u306e\u5408\u8a08\u6642\u9593\u3002RTT\u304c\u5e38\u306b\u9ad8\u3044\u5834\u5408\u306f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u6df7\u96d1\u307e\u305f\u306f\u554f\u984c\u3092\u793a\u3057\u307e\u3059\u3002<\/li>
            • TTL\uff08Time to Live\uff09\uff1a<\/strong>\u30d1\u30b1\u30c3\u30c8\u304c\u7834\u68c4\u3055\u308c\u308b\u307e\u3067\u8a31\u3055\u308c\u308b\u30db\u30c3\u30d7\uff08\u4e2d\u7d99\u70b9\uff09\u306e\u6570\u3002\u30bf\u30fc\u30b2\u30c3\u30c8\u307e\u3067\u306e\u8ddd\u96e2\uff08\u30db\u30c3\u30d7\u6570\uff09\u3092\u628a\u63e1\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/li><\/ul>

              ICMP\u3068TCP\/IP<\/h2>

              ICMP\u306fTCP\/IP\u30b9\u30a4\u30fc\u30c8\u306e\u4e2d\u6838\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3042\u308a\u3001TCP<\/a>\u3084UDP\u306a\u3069\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u5bc6\u63a5\u306b\u9023\u643a\u3057\u307e\u3059\u3002TCP\u3084UDP\u304c\u30c7\u30fc\u30bf\u4f1d\u9001\u306b\u4f7f\u308f\u308c\u308b\u306e\u306b\u5bfe\u3057\u3001ICMP\u306f\u4e3b\u306b\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3084\u904b\u7528\u60c5\u5831\u306e\u9001\u4fe1\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>

              ICMP\u30d1\u30b1\u30c3\u30c8\u69cb\u9020<\/h2>

              ICMP\u30d1\u30b1\u30c3\u30c8\u306fICMP\u30d8\u30c3\u30c0\u30fc\u3001IP\u30d8\u30c3\u30c0\u30fc\u3001\u30da\u30a4\u30ed\u30fc\u30c9\u3092\u542b\u307f\u307e\u3059\u3002ICMP\u30d8\u30c3\u30c0\u30fc\u306b\u306fICMP\u30bf\u30a4\u30d7\u3001\u30b3\u30fc\u30c9\u3001\u30c1\u30a7\u30c3\u30af\u30b5\u30e0\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u7a2e\u5225\u306b\u5fdc\u3058\u305f\u305d\u306e\u4ed6\u306e\u30c7\u30fc\u30bf\u304c\u542b\u307e\u308c\u307e\u3059\u3002IP\u30d8\u30c3\u30c0\u30fc\u306fICMP\u30d8\u30c3\u30c0\u30fc\u306e\u524d\u306b\u3042\u308a\u3001\u9001\u4fe1\u5143\u30fb\u5b9b\u5148IP\u30a2\u30c9\u30ec\u30b9\u3092\u542b\u307f\u3001\u30da\u30a4\u30ed\u30fc\u30c9\u306b\u306f\u9001\u4fe1\u3055\u308c\u308b\u30c7\u30fc\u30bf\u304c\u542b\u307e\u308c\u307e\u3059\u3002<\/p>

              \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7ba1\u7406\u306b\u304a\u3051\u308bICMP\u3068Ping\u306e\u91cd\u8981\u6027<\/h2>

              • \u63a5\u7d9a\u30c6\u30b9\u30c8\uff1a<\/strong>ping\u306f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u30c7\u30d0\u30a4\u30b9\u9593\u306e\u63a5\u7d9a\u6027\u3092\u691c\u8a3c\u3057\u3001\u30db\u30b9\u30c8\u306e\u5230\u9054\u53ef\u80fd\u6027\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>
              • \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a3a\u65ad\uff1a<\/strong>ICMP\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u5230\u9054\u4e0d\u80fd\u30db\u30b9\u30c8\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u30eb\u30fc\u30d7\u3001\u30d1\u30b1\u30c3\u30c8\u5206\u5272\u306a\u3069\u306e\u554f\u984c\u3092\u5224\u5225\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/li>
              • \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u76e3\u8996<\/a>\uff1a<\/strong>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7ba1\u7406\u8005\u306fRTT\u3092\u6e2c\u5b9a\u3057\u3066\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3084\u9045\u5ef6\u554f\u984c\u3092\u76e3\u8996\u3067\u304d\u307e\u3059\u3002<\/li>
              • \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\uff1a<\/strong>ICMP\u306fICMP\u30d5\u30e9\u30c3\u30c7\u30a3\u30f3\u30b0\u306a\u3069\u7279\u5b9a\u306e\u653b\u6483\u306e\u691c\u77e5\u30fb\u9632\u6b62\u306b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3067\u5229\u7528\u3055\u308c\u307e\u3059\u3002<\/li><\/ul>

                \u3088\u304f\u3042\u308b\u554f\u984c\u3068\u5bfe\u7b56<\/h2>

                • \u30d1\u30b1\u30c3\u30c8\u30ed\u30b9\uff1a<\/strong>\u9ad8\u3044\u30d1\u30b1\u30c3\u30c8\u30ed\u30b9\u306f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u6df7\u96d1\u3001\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u969c\u5bb3\u3001\u8a2d\u5b9a\u30df\u30b9\u3092\u793a\u3059\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7d4c\u8def\u3001\u30c7\u30d0\u30a4\u30b9\u3001\u8a2d\u5b9a\u3092\u8abf\u67fb\u3057\u3066\u89e3\u6c7a\u3057\u307e\u3057\u3087\u3046\u3002<\/li>
                • \u9ad8\u9045\u5ef6\uff1a<\/strong>RTT\u304c\u5e38\u306b\u9ad8\u3044\u5834\u5408\u306f\u6df7\u96d1\u3084\u975e\u52b9\u7387\u306a\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u304c\u8003\u3048\u3089\u308c\u307e\u3059\u3002\u6df7\u96d1\u30dd\u30a4\u30f3\u30c8\u3092\u7279\u5b9a\u3057\u8efd\u6e1b\u3001\u307e\u305f\u306f\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u6700\u9069\u5316\u3092\u884c\u3044\u307e\u3057\u3087\u3046\u3002<\/li>
                • Destination Unreachable\uff1a<\/strong>IP\u30a2\u30c9\u30ec\u30b9\u3084\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u30c6\u30fc\u30d6\u30eb\u3001\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u30eb\u30fc\u30eb\u306a\u3069\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a2d\u5b9a\u3092\u78ba\u8a8d\u3057\u3001\u5230\u9054\u4e0d\u80fd\u554f\u984c\u306b\u5bfe\u5fdc\u3057\u307e\u3059\u3002<\/li><\/ul>

                  ICMP\u3068Ping\u4f7f\u7528\u6642\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2>

                  • \u5b9a\u671f\u76e3\u8996\uff1a<\/strong>ping\u3084\u305d\u306e\u4ed6ICMP\u30c4\u30fc\u30eb\u3067\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u5065\u5168\u6027\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5b9a\u671f\u7684\u306b\u76e3\u8996\u3057\u307e\u3057\u3087\u3046\u3002<\/li>
                  • \u81ea\u52d5\u5316\uff1a<\/strong>ICMP\u30d9\u30fc\u30b9\u306e\u76e3\u8996\u3092\u81ea\u52d5\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u306b\u7d44\u307f\u8fbc\u307f\u3001\u7d99\u7d9a\u7684\u306a\u6027\u80fd\u8ffd\u8de1\u3068\u30a2\u30e9\u30fc\u30c8\u3092\u5b9f\u65bd\u3057\u307e\u3059\u3002<\/li>
                  • \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u914d\u616e\uff1a<\/strong>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u304c\u91cd\u8981\u306a\u74b0\u5883\u3067\u306fICMP\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u4fe1\u983c\u3067\u304d\u308b\u9001\u4fe1\u5143\u306b\u9650\u5b9a\u3057\u3001DoS\u653b\u6483\u306a\u3069\u306e\u60aa\u7528\u3092\u9632\u6b62\u3057\u307e\u3057\u3087\u3046\u3002<\/li><\/ul>

                    Ping\u3068ICMP\u306e\u9ad8\u5ea6\u306a\u5229\u7528\u6cd5<\/h2>

                    • IPv4\u304a\u3088\u3073IPv6\u5bfe\u5fdc\uff1a<\/strong>ICMP\u306fIPv4\u3068IPv6\u306e\u4e21\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u4f7f\u308f\u308c\u3001\u5b9f\u88c5\u306b\u82e5\u5e72\u306e\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002ping\u306f\u4e21\u65b9\u306eIP\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u5305\u62ec\u7684\u306a\u8a3a\u65ad\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/li>
                    • Ping\u30b9\u30a4\u30fc\u30d7\uff1a<\/strong>\u7279\u5b9a\u7bc4\u56f2\u5185\u3067\u30a2\u30af\u30c6\u30a3\u30d6\u306aIP\u30a2\u30c9\u30ec\u30b9\u3092\u8abf\u3079\u308b\u6280\u8853\u3067\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30de\u30c3\u30d4\u30f3\u30b0\u3084\u7ba1\u7406\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/li>
                    • \u9ad8\u5ea6\u306a\u901a\u77e5\uff1a<\/strong>ping\u306e\u7d50\u679c\u3092\u901a\u77e5\u30b7\u30b9\u30c6\u30e0\u3068\u9023\u643a\u3057\u3001\u63a5\u7d9a\u554f\u984c\u3092\u7ba1\u7406\u8005\u306b\u30a2\u30e9\u30fc\u30c8\uff08\u30e1\u30fc\u30eb\u901a\u77e5\u3001SMS\u30a2\u30e9\u30fc\u30c8\u3001\u76e3\u8996\u30c0\u30c3\u30b7\u30e5\u30dc\u30fc\u30c9<\/a>\u9023\u643a\u306a\u3069\uff09\u3067\u77e5\u3089\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li><\/ul>

                      DNS<\/a>\u3068ICMP<\/h2>

                      ICMP\u306fDNS\uff08\u30c9\u30e1\u30a4\u30f3\u30cd\u30fc\u30e0\u30b7\u30b9\u30c6\u30e0\uff09<\/a>\u306e\u8a3a\u65ad\u306b\u3082\u4f7f\u308f\u308c\u307e\u3059\u3002\u4f8b\u3048\u3070ping\u30b3\u30de\u30f3\u30c9\u304c\u5931\u6557\u3059\u308b\u3068DNS\u89e3\u6c7a\u306b\u554f\u984c\u304c\u3042\u308b\u53ef\u80fd\u6027\u3092\u793a\u3057\u3001DNS<\/a>\u8a2d\u5b9a\u3084\u30b5\u30fc\u30d0\u30fc\u30b9\u30c6\u30fc\u30bf\u30b9\u3092\u8abf\u67fb\u3059\u308b\u5951\u6a5f\u3068\u306a\u308a\u307e\u3059\u3002<\/p>

                      \u8a8d\u8a3c\u3068ICMP<\/h2>

                      ICMP\u30d7\u30ed\u30c8\u30b3\u30eb\u81ea\u4f53\u306f\u8a8d\u8a3c\u6a5f\u80fd\u3092\u63d0\u4f9b\u3057\u307e\u305b\u3093\u304c\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u5e83\u3044\u6587\u8108\u3067\u306f\u8a8d\u8a3c\u3092\u8003\u616e\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u6a5f\u5668\u3084\u30b7\u30b9\u30c6\u30e0\u304c\u8a8d\u8a3c\u3055\u308c\u305f\u63a5\u7d9a\u306e\u307f\u3092\u8a31\u53ef\u3057\u3001ICMP\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u4e0d\u6b63\u5229\u7528\u3084\u4e0d\u6b63\u30a2\u30af\u30bb\u30b9\u306e\u9632\u6b62\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>

                      \u30c7\u30fc\u30bf\u30b0\u30e9\u30e0\u3068ICMP<\/h2>

                      \u30c7\u30fc\u30bf\u30b0\u30e9\u30e0\u306f\u30d1\u30b1\u30c3\u30c8\u30b9\u30a4\u30c3\u30c1\u578b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u4f7f\u7528\u3055\u308c\u308b\u57fa\u672c\u7684\u306a\u30c7\u30fc\u30bf\u8ee2\u9001\u5358\u4f4d\u3067\u3059\u3002ICMP\u30e1\u30c3\u30bb\u30fc\u30b8\u306fIP\u30c7\u30fc\u30bf\u30b0\u30e9\u30e0\u5185\u306b\u30ab\u30d7\u30bb\u30eb\u5316\u3055\u308c\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u9593\u7d4c\u8def\u6307\u5b9a\u53ef\u80fd\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u30c7\u30fc\u30bf\u30b0\u30e9\u30e0\u306e\u4ed5\u7d44\u307f\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u3001ICMP\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u89e3\u91c8\u3068\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a3a\u65ad\u306b\u91cd\u8981\u3067\u3059\u3002<\/p>

                      \u7d50\u8ad6<\/h2>

                      ICMP\u3068ping\u30b3\u30de\u30f3\u30c9\u306f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7ba1\u7406\u3068\u8a3a\u65ad\u306b\u4e0d\u53ef\u6b20\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u63a5\u7d9a\u6027\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3001\u5065\u5168\u6027\u306b\u95a2\u3059\u308b\u91cd\u8981\u306a\u60c5\u5831\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30c4\u30fc\u30eb\u306e\u4ed5\u7d44\u307f\u3092\u7406\u89e3\u3057\u3001\u7d50\u679c\u306e\u89e3\u91c8\u3092\u9069\u5207\u306b\u884c\u3046\u3053\u3068\u3067\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7ba1\u7406\u8005\u306f\u52b9\u679c\u7684\u306b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u554f\u984c\u3092\u7ba1\u7406\u30fb\u89e3\u6c7a\u3067\u304d\u3001\u4fe1\u983c\u6027\u3068\u52b9\u7387\u6027\u306e\u9ad8\u3044\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a4\u30f3\u30d5\u30e9\u3092\u7dad\u6301\u3067\u304d\u307e\u3059\u3002<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

                      \n\t\t\t\t\t

                      \n\t\t\t\t

                      \n\t\t\t\t

                      \n\t\t\t\t\t\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30c7\u30d0\u30a4\u30b9\u306e\u5065\u5168\u6027\u3068\u5fdc\u7b54\u6027\u3092\u7a4d\u6975\u7684\u306b\u628a\u63e1\u3067\u304d\u308bICMP\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u958b\u767a\u3068\u4f7f\u7528\u306e\u5fc5\u8981\u6027\u3092\u3054\u7406\u89e3\u3044\u305f\u3060\u3051\u307e\u3059\u304b\uff1f<\/span>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

                      \n\t\t\t\t

                      \n\t\t\t\t\t\u7121\u6599\u30c8\u30e9\u30a4\u30a2\u30eb\u306b\u4eca\u3059\u3050\u767b\u9332\u3059\u308b\u304b\u3001\u30c7\u30e2\u3092\u4e88\u7d04\u3057\u3066\u52d5\u4f5c\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\uff01<\/span>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

                      \n\t\t\t\t\t

                      \n\t\t\t\t

                      \n\t\t\t\t

                      \n\t\t\t\t\t\t\t\t\t

                      \n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\u59cb\u3081\u308b<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

                      \n\t\t\t\t

                      \n\t\t\t\t\t\t\t\t\t

                      \n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t1\u5bfe1\u30c7\u30e2<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

                      \n\t\t\t\t

                      \n\t\t\t\t

                      \n\t\t\t\t\t\t\t\t\t

                      \n\t\t\t\t\t\t

                      \n\t\t\t\t\u76ee\u6b21\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t

                      <\/i><\/div>\n\t\t\t\t

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