{"id":16164,"date":"2022-01-01T17:34:40","date_gmt":"2022-01-01T08:34:40","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=16164"},"modified":"2023-05-28T08:39:18","modified_gmt":"2023-05-27T23:39:18","slug":"%e3%80%90%e3%83%8d%e3%83%83%e3%83%88%e3%83%af%e3%83%bc%e3%82%af%e3%80%91%e3%80%8c%e3%83%91%e3%82%b1%e3%83%83%e3%83%88%e8%a7%a3%e6%9e%90%e3%80%8d%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=16164","title":{"rendered":"\u3010\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3011\u300c\u30d1\u30b1\u30c3\u30c8\u89e3\u6790\u300d\u3001\u89e3\u6790\u306e\u6d41\u308c"},"content":{"rendered":"<h2>\u305d\u3082\u305d\u3082\u30d1\u30b1\u30c3\u30c8\u3068\u306f\uff1f<\/h2>\n<p>\u305d\u306e\u307e\u307e\u30c7\u30fc\u30bf\u3092\u9001\u4ed8\u3059\u308b\u3068\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u8ca0\u8377\u304c\u304b\u304b\u308b\u4e0a\u3067\u6642\u9593\u3082\u304b\u304b\u308b\u306e\u3067\u5927\u5909\u3002\u30d1\u30b1\u30c3\u30c8\u3068\u3044\u3046\u5c0f\u3055\u3044\u5358\u4f4d\u306b\u5206\u5272\u3057\u3066\u9001\u4ed8\u3057\u307e\u3059\u3002<\/p>\n<p>\u300c\u60c5\u5831\uff08\u30c7\u30fc\u30bf\u672c\u4f53\uff09\u300d\u3068\u300c\u30d8\u30c3\u30c0\uff08\u5236\u5fa1\u60c5\u5831\uff09\u300d\u306e\u4e8c\u3064\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u584a\u3002<\/p>\n<h3>\u30d8\u30c3\u30c0<\/h3>\n<p>\u300c\u3069\u306e\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u9593\u306e\u901a\u4fe1\u3067\u3042\u308b\u304b\u300d\u304c\u3053\u308c\u3092\u898b\u308c\u3070\u308f\u304b\u308b\u3002<\/p>\n<h3>\u30d1\u30b1\u30c3\u30c8\u306e\u30a4\u30e1\u30fc\u30b8<\/h3>\n<p>\u30d1\u30b1\u30c3\u30c8\u3068\u4e00\u8a00\u3067\u8a00\u3063\u3066\u3082\u300cHTTP\u30d1\u30b1\u30c3\u30c8\u300d\u3001\u300cTCP\u30d1\u30b1\u30c3\u30c8\u300d\u3001\u300cIP\u30d1\u30b1\u30c3\u30c8\u300d\u306a\u3069\u305f\u304f\u3055\u3093\u306e\u7a2e\u985e\u304c\u3042\u308b\u3002<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-16176\" src=\"http:\/\/www.code-magagine.com\/wp-content\/uploads\/2022\/01\/-2022-01-01-22.17.05-e1641043092679.png\" alt=\"\" width=\"600\" height=\"323\" \/><\/p>\n<h4>MAC\u30d5\u30ec\u30fc\u30e0<\/h4>\n<p>\u30d1\u30b1\u30c3\u30c8\u3068\u540c\u3058\u610f\u5473\u5408\u3044\u3067\u4f7f\u308f\u308c\u308b\u3002\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u5c64\u3067\u898b\u305f\u6642\u306e\u547c\u3073\u65b9\u3002\u4f1d\u9001\u30a8\u30e9\u30fc\u304c\u8d77\u3053\u3063\u3066\u3044\u306a\u3044\u304b\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b\u3001\u30d1\u30b1\u30c3\u30c8\u306e\u5f8c\u308d\u306b\u30a8\u30e9\u30fc\u691c\u8a3c\u7528\u306e\u30c7\u30fc\u30bf\u304c\u3064\u304f\u3053\u3068\u304c\u591a\u3044\u3002<\/p>\n<h5>\u30c8\u30ec\u30a4\u30e9<\/h5>\n<p>\u30d1\u30b1\u30c3\u30c8\u306e\u6700\u5f8c\u5c3e\u306b\u4ed8\u304f\u5236\u5fa1\u60c5\u5831\u3002<\/p>\n<h4>TCP\u30d8\u30c3\u30c0<\/h4>\n<p>\u30d8\u30c3\u30c0\u30fc\u306e\u9577\u3055\u306f\u3001\u6700\u4f4e\u3067\u308220\u30d0\u30a4\u30c8(160\u30d3\u30c3\u30c8\uff09\u3042\u308b\u3002<\/p>\n<h5>\u9001\u4fe1\u5143\u30dd\u30fc\u30c8\u756a\u53f7\/\u5b9b\u5148\u30dd\u30fc\u30c8\u756a\u53f7<\/h5>\n<p>UDP\u3068\u307b\u307c\u540c\u3058\u3067\u3059\u3002<\/p>\n<h5>\u30b7\u30fc\u30b1\u30f3\u30b9\u756a\u53f7<\/h5>\n<p>TCP\u30bb\u30b0\u30e1\u30f3\u30c8\u3092\u6b63\u3057\u3044\u9806\u5e8f\u306b\u4e26\u3079\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b32\u30d3\u30c3\u30c8\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3067\u3059\u3002\u9001\u4fe1\u5074\u304c\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304b\u3089\u53d7\u3051\u53d6\u3063\u305f\u30c7\u30fc\u30bf\u3092\u5143\u306b\u901a\u3057\u756a\u53f7\u3092\u4ed8\u4e0e\u3057\u307e\u3059\u3002\uff08\u63a5\u7d9a\u3092\u958b\u59cb\u3057\u305f\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u30e9\u30f3\u30c0\u30e0\u306a\u756a\u53f7\u304c\u5272\u308a\u632f\u3089\u308c\u307e\u3059\u3002\uff09\u305d\u306e\u5f8c\u3001\u53d7\u4fe1\u5074\u306e\u7aef\u672b\u306f\u53d7\u3051\u53d6\u3063\u305f\u30c7\u30fc\u30bf\u3092\u78ba\u8a8d\u3057\u3066\u756a\u53f7\u9806\u306b\u4e26\u3073\u66ff\u3048\u3066\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u6e21\u3057\u307e\u3059\u3002<\/p>\n<h5>\u78ba\u8a8d\u5fdc\u7b54\u756a\u53f7<\/h5>\n<p>\u300c\u6b21\u306f\u3053\u3053\u304b\u3089\u30c7\u30fc\u30bf\u3092\u304f\u3060\u3055\u3044\u300d\u3068\u76f8\u624b\u306b\u4f1d\u3048\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b32\u30d3\u30c3\u30c8\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3002\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u30d3\u30c3\u30c8\u306eACK\u30d5\u30e9\u30b0\u304c\u300c1\u300d\u306b\u306a\u3063\u3066\u3044\u308b\u5834\u5408\u306e\u307f\u3060\u3051\u6709\u52b9\u306b\u306a\u308b\u30d5\u30a3\u30fc\u30eb\u30c9\u3002<\/p>\n<h5>\u30c7\u30fc\u30bf\u30aa\u30d5\u30bb\u30c3\u30c8<\/h5>\n<p>TCP\u30d8\u30c3\u30c0\u30fc\u306e\u9577\u3055\u3092\u8868\u30594\u30d3\u30c3\u30c8\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3002Wireshark\u3067\u306f\u300cHeader Length\u300d\u3068\u8868\u793a\u3055\u308c\u308b\u3002<\/p>\n<h5>\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u30d3\u30c3\u30c8<\/h5>\n<p>\u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u306e\u72b6\u614b\u3092\u5236\u5fa1\u3059\u308b\u30d5\u30a3\u30fc\u30eb\u30c9\u30026\u30d3\u30c3\u30c8\u306e\u30d5\u30e9\u30b0\u3067\u69cb\u6210\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n<h5>\u30a6\u30a3\u30f3\u30c9\u30a6\u30b5\u30a4\u30ba<\/h5>\n<p>TCP\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u7aef\u672b\u306f\u9001\u4fe1\u30c7\u30fc\u30bf\u3092\u4e00\u6642\u7684\u306b\u683c\u7d0d\u3059\u308b\u300c\u9001\u4fe1\u30d0\u30c3\u30d5\u30a1\u300d\u3068\u3001\u53d7\u4fe1\u30c7\u30fc\u30bf\u3092\u4e00\u6642\u7684\u306b\u683c\u7d0d\u3059\u308b\u300c\u53d7\u4fe1\u30d0\u30c3\u30d5\u30a1\u300d\u3068\u3044\u3046\u56fa\u5b9a\u30b5\u30a4\u30ba\u306e\u30d0\u30c3\u30d5\u30a1\u9818\u57df\u3092\u6301\u3063\u3066\u3044\u308b\u3002<\/p>\n<h5>\u30c1\u30a7\u30c3\u30af\u30b5\u30e0<\/h5>\n<p>\u53d7\u3051\u53d6\u3063\u305fTCP\u304c\u58ca\u308c\u3066\u3044\u306a\u3044\u304b\u58ca\u308c\u3066\u3044\u306a\u3044\u304b\u6574\u5408\u6027\u306e\u30c1\u30a7\u30c3\u30af\u306b\u4f7f\u7528\u3055\u308c\u308b16\u30d3\u30c3\u30c8\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3067\u3059\u3002<\/p>\n<h4>IP\u30d8\u30c3\u30c0<\/h4>\n<p>\u300cIP\u30d8\u30c3\u30c0\u300d\u3068\u300cIP\u30da\u30a4\u30ed\u30fc\u30c9\u300d\u306b\u5206\u304b\u308c\u307e\u3059\u3002<\/p>\n<h5>\u30d0\u30fc\u30b8\u30e7\u30f3<\/h5>\n<p>IP\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u8868\u30594\u30d3\u30c3\u30c8\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3002IPv4\u306a\u3089\u300c4\u300d\u3001IPv6\u306a\u3089\u300c6\u300d\u3067\u3059\u3002<\/p>\n<h5>\u30d8\u30c3\u30c0\u30fc\u9577<\/h5>\n<p>IP\u30d8\u30c3\u30c0\u30fc\u306e\u9577\u3055\u3092\u8868\u30594\u30d3\u30c3\u30c8\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3067\u3059\u3002\u300cIHL(Internet Header Length)\u300d\u3068\u547c\u3093\u3060\u308a\u3082\u3057\u307e\u3059\u3002<\/p>\n<h5>ToS(Type of Service)<\/h5>\n<p>IP\u30d1\u30b1\u30c3\u30c8\u306e\u512a\u5148\u5ea6\u3092\u8868\u30598\u30d3\u30c3\u30c8\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3002Wireshark\u3067\u306f\u300cDifferentiated Services Field\u300d\u3068\u8868\u793a\u3055\u308c\u308b\u3002\u512a\u5148\u5236\u5fa1\u3084\u5e2f\u57df\u5236\u5fa1\u306a\u3069QoS\u3067\u5229\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<h6>IP\u30d7\u30ec\u30b8\u30c7\u30f3\u30b9<\/h6>\n<p>\u5148\u982d3\u30d3\u30c3\u30c8\u30028\u6bb5\u968e\u3067\u512a\u5148\u5ea6\u304c\u6c7a\u3081\u308c\u3066\u5024\u304c\u5927\u304d\u3051\u308c\u3070\u5927\u304d\u3044\u307b\u3069\u512a\u5148\u5ea6\u304c\u9ad8\u304f\u306a\u308b\u3002<\/p>\n<h6>DSCP<\/h6>\n<p>\u5148\u982d6\u30d3\u30c3\u30c8\u3002IP\u30d7\u30ec\u30b8\u30c7\u30f3\u30b9\u306e\u30d1\u30ef\u30fc\u30a2\u30c3\u30d7\u30d0\u30fc\u30b8\u30e7\u30f3\u3002<\/p>\n<h5>\u30d1\u30b1\u30c3\u30c8\u9577<\/h5>\n<p>IP\u30d8\u30c3\u30c0\u30fc\u3068IP\u30da\u30a4\u30ed\u30fc\u30c9\u3092\u5408\u308f\u305b\u305f\u30d1\u30b1\u30c3\u30c8\u5168\u4f53\u306e16\u30d3\u30c3\u30c8\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3002<\/p>\n<h5>\u8b58\u5225\u5b50<\/h5>\n<p>IP\u30d1\u30b1\u30c3\u30c8\u306e\u300c\u30d5\u30e9\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\uff08\u65ad\u7247\u5316\uff09\u300d\u306b\u95a2\u3059\u308b\u30d5\u30a3\u30fc\u30eb\u30c9\u3002MTU\u306b\u53ce\u307e\u308a\u304d\u3089\u306a\u3044\u30b5\u30a4\u30ba\u306eIP\u30da\u30a4\u30ed\u30fc\u30c9\u3092MTU\u306b\u53ce\u307e\u308a\u304d\u308b\u3088\u3046\u306b\u5206\u5272\u3059\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5c64\u306e\u6a5f\u80fd\u3067\u3059\u3002<\/p>\n<h2>\u30d1\u30b1\u30c3\u30c8\u89e3\u6790\u3068\u306f\uff1f<\/h2>\n<p>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306b\u6d41\u308c\u308b\u5b9f\u30c7\u30fc\u30bf\u306e\u30d1\u30b1\u30c3\u30c8\u3092\u30ad\u30e3\u30d7\u30c1\u30e3\u3057\u3066\u89e3\u6790\u3059\u308b\u3053\u3068\u3002<\/p>\n<h2>\u30d1\u30b1\u30c3\u30c8\u89e3\u6790\u306e\u5229\u70b9<\/h2>\n<p>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30ed\u30b0\u3092\u8aad\u307f\u89e3\u304f\u3088\u308a\u3082\u3001\u6b63\u78ba\u3067\u4e8b\u5b9f\u3057\u304b\u306a\u3044\u3002\u30a2\u30d7\u30ea\u5074\u306e\u30ed\u30b0\u3060\u3068\u5b9f\u88c5\u304c\u30df\u30b9\u3063\u3066\u3044\u305f\u3089\u9593\u9055\u3063\u305f\u30ed\u30b0\u5185\u5bb9\u304c\u51fa\u529b\u3055\u308c\u3066\u3057\u307e\u3046\u3002<\/p>\n<h2>\u30d1\u30b1\u30c3\u30c8\u89e3\u6790\u306e\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/h2>\n<p>\u4e3b\u306b\u958b\u767a\u306e\u5de5\u7a0b\u306b\u304a\u3044\u3066\u30d1\u30b1\u30c3\u30c8\u89e3\u6790\u304c\u52b9\u679c\u3092\u767a\u63ee\u3059\u308b\u306e\u306f\u4ee5\u4e0b\u306e2\u3064\u306e\u30d5\u30a7\u30fc\u30ba\u3067\u3059\u3002<\/p>\n<h3>\u8a66\u9a13\u30d5\u30a7\u30fc\u30ba<\/h3>\n<p>\u8a66\u9a13\u304cNG\u306b\u306a\u3063\u305f\u6642\u306b\u30d1\u30b1\u30c3\u30c8\u306e\u6d41\u308c\u3084\u72b6\u614b\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3067\u5931\u6557\u306e\u539f\u56e0\u3092\u8ffd\u6c42\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>\u904b\u7528\u7ba1\u7406\u30d5\u30a7\u30fc\u30ba<\/h3>\n<p>\u307e\u305f\u3001\u8a66\u9a13\u306e\u969b\u306b\u6b63\u5e38\u306a\u30d1\u30b1\u30c3\u30c8\u30ad\u30e3\u30d7\u30c1\u30e3\u30c7\u30fc\u30bf\u3092\u4fdd\u5b58\u3057\u3066\u304a\u304d\u3001\u904b\u7528\u6642\u306b\u969c\u5bb3\u304c\u767a\u751f\u3057\u305f\u6642\u306e\u539f\u56e0\u306e\u5207\u308a\u5206\u3051\u306b\u3082\u5f79\u7acb\u3066\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u7121\u6599\u30bd\u30d5\u30c8<\/h2>\n<ul>\n<li>Wireshark<\/li>\n<li>Microsoft Network Monitor<\/li>\n<\/ul>\n<h3>Wireshark\u306e\u30e1\u30ea\u30c3\u30c8<\/h3>\n<ul>\n<li>Windows\u3001Linux\u3001Mac\u5168\u3066\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u3002<\/li>\n<li>\u30d1\u30b1\u30c3\u30c8\u5185\u5bb9\u3092\u8a73\u7d30\u8868\u793a\u3067\u304d\u3001\u753b\u9762\u4e0a\u3067\u30b0\u30e9\u30d5\u30a3\u30ab\u30eb\u8868\u793a\u3067\u304d\u308b\u3002<\/li>\n<li>\u30ad\u30e3\u30d7\u30c1\u30e3\u3057\u305f\u30c7\u30fc\u30bf\u3092\u69d8\u3005\u306a\u5f62\u5f0f\u3067\u4fdd\u5b58\u3067\u304d\u308b\u3002<\/li>\n<li>\u30d1\u30b1\u30c3\u30c8\u3092\u69d8\u3005\u306a\u6761\u4ef6\u3067\u30d5\u30a3\u30eb\u30bf\u3067\u304d\u308b\u3002<\/li>\n<li>\u91cd\u8981\u306a\u30d1\u30b1\u30c3\u30c8\u306b\u8272\u3092\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/li>\n<li>\u69d8\u3005\u306a\u7d71\u8a08\u60c5\u5831\u3092\u53d6\u5f97\u3067\u304d\u308b\u3002<\/li>\n<\/ul>\n<h2>\u6709\u511f\u30bd\u30d5\u30c8<\/h2>\n<h3>\u30e1\u30ea\u30c3\u30c8<\/h3>\n<p>IDS(\u4fb5\u5165\u691c\u77e5\u30b7\u30b9\u30c6\u30e0\uff09\u306b\u3082\u5bfe\u5fdc\u3057\u3066\u304a\u308a\u901a\u4fe1\u5185\u5bb9\u3092\u76e3\u8996\u3057\u3066\u3001\u653b\u6483\u3092\u691c\u77e5\u3057\u3066\u5831\u544a\u3059\u308b\u6a5f\u80fd\u3082\u3042\u308b\u3002<\/p>\n<h2>\u30d1\u30b1\u30c3\u30c8\u89e3\u6790\u306e\u4ed5\u7d44\u307f<\/h2>\n<p>\u30d1\u30b1\u30c3\u30c8\u30ad\u30e3\u30d7\u30c1\u30e3\u306fWireshark\u5358\u4f53\u3067\u306f\u52d5\u304b\u306a\u3044\u3002\u300c\u30d1\u30b1\u30c3\u30c8\u30ad\u30e3\u30d7\u30c1\u30e3\u30c9\u30e9\u30a4\u30d0\u300d\u304c\u5225\u9014\u5fc5\u8981\u306b\u306a\u308b\u3002\uff08WIndows\u3067\u8a00\u3048\u3070\u300cWInPcap\u3001Npcap\u300d\u306a\u3069\u3002UNIX\/Linux\u306e\u5834\u5408\u306f\u3001\u300clibpcap\u300d\uff09<\/p>\n<h3>\u30d1\u30b1\u30c3\u30c8\u30ad\u30e3\u30d7\u30c1\u30e3\u30c9\u30e9\u30a4\u30d0<\/h3>\n<p>\u901a\u5e38\u306e\u65b9\u6cd5\u3067\u306f\u53d6\u5f97\u3067\u304d\u306a\u3044\u30d1\u30b1\u30c3\u30c8\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306e\u7279\u6b8a\u306a\u30c7\u30d0\u30a4\u30b9\u30c9\u30e9\u30a4\u30d0\u3002\u30d1\u30b1\u3063\u30c8\u30ad\u30e3\u30d7\u30c1\u30e3\u30bd\u30d5\u30c8\u3092\u4f7f\u7528\u3059\u308b\u3060\u3051\u3067\u306f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u3042\u308b\u300c\u30bd\u30b1\u30c3\u30c8\u300d\u3057\u304b\u4f7f\u7528\u3067\u304d\u305a\u81ea\u8eab\u306e\u30a2\u30d7\u30ea\u5411\u3051\u306e\u30d1\u30b1\u30c3\u30c8\u3057\u304b\u53d6\u5f97\u3067\u304d\u306a\u3044\u3067\u3059\u304c\u3001\u30d1\u30b1\u30c3\u30c8\u30ad\u30e3\u30d7\u30c1\u30e3\u30c9\u30e9\u30a4\u30d0\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067<span style=\"color: #ff0000;\"><strong>\u81ea\u8eab\u306e\u30a2\u30d7\u30ea\u5411\u3051\u306e\u30d1\u30b1\u30c3\u30c8\u4ee5\u5916\u306b\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u6d41\u308c\u308b\u30d1\u30b1\u30c3\u30c8\u5168\u3066<\/strong><\/span>\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h4>\u30d7\u30ed\u30df\u30b9\u30ad\u30e3\u30b9\u30e2\u30fc\u30c9<\/h4>\n<p>NIC\u304c\u6301\u3064\u52d5\u4f5c\u30e2\u30fc\u30c9\u306e\u4e00\u3064\u3067\u3059\u3002\u30d1\u30b1\u30c3\u30c8\u30ad\u30e3\u30d7\u30c1\u30e3\u30c9\u30e9\u30a4\u30d0\u306f\u3053\u306e\u7279\u6b8a\u306a\u30e2\u30fc\u30c9\u306b\u3059\u308b\u3053\u3068\u3067\u52d5\u4f5c\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u5207\u308a\u66ff\u3048\u308b\u3053\u3068\u3067\u81ea\u5206\u5b9b\u306e\u30d1\u30b1\u30c3\u30c8\u3058\u3083\u306a\u3044\u3082\u306e\u3082\u51e6\u7406\u3067\u304d\u308b\u3002\uff08\u6a19\u6e96\u30e2\u30fc\u30c9\u306eNIC\u3060\u3068\u81ea\u5206\u5b9b\u306e\u30d1\u30b1\u30c3\u30c8\u3092\u53d7\u4fe1\u3057\u305f\u6642\u306e\u307f\u4e0a\u4f4d\u30ec\u30a4\u30e4\u30fc\u306b\u53d7\u3051\u6e21\u3059\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u308b\u304c\u3001\u3053\u308c\u3092\u4f7f\u3048\u3070\u81ea\u5206\u5b9b\u4ee5\u5916\u3082\u53d7\u4fe1\u3067\u304d\u308b\u3002\uff09<\/p>\n<p>\u305f\u3060\u3001\u30d7\u30ed\u30df\u30b9\u30ad\u30e3\u30b9\u30e2\u30fc\u30c9\u306f\u4f7f\u3044\u65b9\u306b\u3088\u3063\u3066\u306f\u60aa\u610f\u306e\u3042\u308b\u76d7\u8074\u306e\u624b\u6bb5\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u306e\u3067\u3001\u516c\u958b\u306f\u3055\u308c\u3066\u3044\u306a\u3044\u3002<\/p>\n<h2>\u30d1\u30b1\u30c3\u30c8\u30ad\u30e3\u30d7\u30c1\u30e3\u306e\u6d41\u308c<\/h2>\n<h3>\u57fa\u672c\u60c5\u5831\u306e\u53ce\u96c6<\/h3>\n<p>\u30d1\u30b1\u30c3\u30c8\u3092\u53d6\u5f97\u3057\u305f\u3044\u7aef\u672b\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u60c5\u5831\uff08IP\u30a2\u30c9\u30ec\u30b9\u3001DNS\u30b5\u30fc\u30d0\u3001\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\u30fc\u306eIP\uff09\u306a\u3069\u3092\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u69cb\u6210\u56f3\u306a\u3069\u3092\u78ba\u8a8d\u3057\u3066\u53ce\u96c6\u3057\u307e\u3059\u3002<\/p>\n<h3>\u30c4\u30fc\u30eb\u9078\u5b9a<\/h3>\n<p>\u3069\u306e\u30d1\u30b1\u30c3\u30c8\u30ad\u30e3\u30d7\u30c1\u30e3\u30c4\u30fc\u30eb\u3092\u4f7f\u3046\u304b\u6c7a\u5b9a\u3057\u307e\u3059\u3002\u3069\u308c\u3092\u4f7f\u3046\u304b\u306f\u4f7f\u7528\u3057\u3066\u3044\u308bOS\u306e\u6301\u3063\u3066\u3044\u308b\u6a5f\u80fd\u3084\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30dd\u30ea\u30b7\u30fc\u306b\u3088\u3063\u3066\u5909\u308f\u308a\u307e\u3059\u3002<\/p>\n<h4>Wireshark(\u65e7 Etheral)<\/h4>\n<p>Linux\u3001WIndows\u3001Mac\u306a\u3069\u5e45\u5e83\u304f\u4f7f\u3048\u307e\u3059\u3002\u30d1\u30b1\u30c3\u30c8\u30ad\u30e3\u30d7\u30c1\u30e3\u30c4\u30fc\u30eb\u306e\u57df\u3092\u8d8a\u3048\u3066\u300c\u30d7\u30ed\u30c8\u30b3\u30eb\u30a2\u30ca\u30e9\u30a4\u30b6\u30c4\u30fc\u30eb\u300d\u3068\u306a\u308a\u3064\u3064\u3042\u308a\u307e\u3059\u3002<\/p>\n<h4>tcpdump<\/h4>\n<p>Linux\u3084Mac\u306a\u3069\u306eCLI\u3067\u4f7f\u3048\u308b\u30c4\u30fc\u30eb\u3067\u3059\u3002CLI\u3057\u304b\u5229\u7528\u3067\u304d\u306a\u3044\u74b0\u5883\u3067\u3088\u304f\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3067\u30d1\u30b1\u30c3\u30c8\u60c5\u5831\u3092\u53d6\u5f97\u3057\u3066SCP\u3084FTP\u3067Windows\u306b\u79fb\u3057\u3066Wireshark\u3067\u672c\u683c\u7684\u306a\u30d1\u30b1\u30c3\u30c8\u89e3\u6790\u3092\u3059\u308b\u3068\u3044\u3046\u4f7f\u3044\u65b9\u3092\u3057\u3066\u3044\u308b\u4eba\u3082\u591a\u3044\u3067\u3059\u3002<\/p>\n<h5>\u6a5f\u80fd<\/h5>\n<ul>\n<li>\u30ad\u30e3\u30d7\u30c1\u30e3\u3059\u308b\u3060\u3051\u3067\u306f\u5341\u5206\u306a\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u6a5f\u80fd\u304c\u3042\u308b\u3002<\/li>\n<\/ul>\n<h4>Microsoft Message 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