{"id":11948,"date":"2020-10-08T16:09:50","date_gmt":"2020-10-08T07:09:50","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=11948"},"modified":"2023-05-28T08:40:37","modified_gmt":"2023-05-27T23:40:37","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%8cip%e3%82%a2%e3%83%89%e3%83%ac%e3%82%b9%e3%80%8d%e3%81%a8%e3%80%8cmac%e3%82%a2%e3%83%89%e3%83%ac%e3%82%b9%e3%80%8d","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=11948","title":{"rendered":"\u3010\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3011\u300cIP\u30a2\u30c9\u30ec\u30b9\u300d\u3068\u300cMAC\u30a2\u30c9\u30ec\u30b9\u300d\u306e\u9055\u3044\u3001ARP\u3001DHCP\u3001NAT"},"content":{"rendered":"<h2>\u305d\u308c\u305e\u308c\u306e\u30a2\u30c9\u30ec\u30b9\u306e\u7279\u5fb4<\/h2>\n<h3>MAC\u30a2\u30c9\u30ec\u30b9<\/h3>\n<ul>\n<li>NIC\u306b\u4ed8\u3051\u3089\u308c\u3066\u3044\u308b\u56fa\u6709\u306e\u5024\u3067\u5de5\u5834\u51fa\u8377\u6642\u306b\u30d9\u30f3\u30c0\u30fc\u306b\u3088\u3063\u3066\u3064\u3051\u3089\u308c\u307e\u3059\u3002<\/li>\n<li>Ethernet\u30d8\u30c3\u30c0\u306b\u5b58\u5728\u3057\u3001\u30cd\u30af\u30b9\u30c8\u30db\u30c3\u30d7\uff08\u5b9b\u5148MAC\u30a2\u30c9\u30ec\u30b9\uff09\u304c\u3042\u308b\u306e\u3067\u6b21\u306e\u914d\u9001\u5148\u304c\u308f\u304b\u308b\u3002<\/li>\n<li>\u7aef\u672b\u306b\u7d10\u3065\u3044\u3066\u3044\u3066\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u3002<\/li>\n<li>\u5b9b\u5148IP\u30a2\u30c9\u30ec\u30b9\u3092<span style=\"color: #ff0000;\"><strong>ARP<\/strong><\/span>\u3059\u308b\u3053\u3068\u306b\u3088\u308a<span style=\"color: #ff0000;\"><strong>\u30cd\u30af\u30b9\u30c8\u30db\u30c3\u30d7\u306eMAC\u30a2\u30c9\u30ec\u30b9<\/strong><\/span>\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/li>\n<\/ul>\n<h3>IP\u30a2\u30c9\u30ec\u30b9<\/h3>\n<ul>\n<li>IP\u30d8\u30c3\u30c0\u306b\u5b58\u5728\u3057\u3001\u30cd\u30af\u30b9\u30c8\u30db\u30c3\u30d7\u304c\u306a\u3044\u306e\u3067\u6b21\u306e\u914d\u9001\u5148\u304c\u308f\u304b\u3089\u306a\u3044\u3002<\/li>\n<li>\u81ea\u7531\u306b\u5909\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/li>\n<\/ul>\n<h2>\u306a\u305cMAC\u30a2\u30c9\u30ec\u30b9\u304c\u5fc5\u8981\u304b\uff1f<\/h2>\n<p>IP\u30a2\u30c9\u30ec\u30b9\u3060\u3051\u3067\u3082\u914d\u9001\u306f\u3067\u304d\u307e\u3059\u304c\u3001\u30b9\u30bf\u30fc\u578b\u306eErthnet\u306e\u5834\u5408\u306f\u5b9b\u5148\u306eIP\u3092\u8abf\u3079\u3088\u3046\u3068\u3059\u308b\u3068\u7d4c\u7531\u3059\u308bL2\u30b9\u30a4\u30c3\u30c1\u3067\u306f\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u3092\u3057\u3066\u3069\u306e\u7aef\u672b\u306b\u9001\u308c\u3070\u826f\u3044\u304b\u3092\u63a2\u308b\u3057\u304b\u306a\u304f\u306a\u308a\u307e\u3059\u3002\u305d\u3046\u3059\u308b\u3068\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306b\u30d1\u30b1\u30c3\u30c8\u304c\u6ea2\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u306a\u306e\u3067\u3001MAC\u30a2\u30c9\u30ec\u30b9\u304c\u3042\u308c\u3070\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u901a\u4fe1\u4e0a\u306e\u6e0b\u6ede\u3092\u7de9\u548c\u3055\u305b\u308b\u5f79\u5272\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>ARP(Address Resolution Protocal)<\/h2>\n<p>IP\u30a2\u30c9\u30ec\u30b9\uff08\u30ec\u30a4\u30e4\u30fc3\u306e\u30a2\u30c9\u30ec\u30b9\uff09\u304b\u3089MAC\u30a2\u30c9\u30ec\u30b9\uff08\u30ec\u30a4\u30e4\u30fc2\u306e\u30a2\u30c9\u30ec\u30b9\uff09\u3092\u6c42\u3081\u308b\u30d7\u30ed\u30c8\u30b3\u30eb\u3002\u5b9b\u5148IP\u306b\u5bfe\u5fdc\u3059\u308bMAC\u30a2\u30c9\u30ec\u30b9\u3092\u52d5\u7684\u306b\u8abf\u3079\u308b\u305f\u3081\u306bARP\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n<h3>\u306a\u305cARP\u304c\u5b58\u5728\u3059\u308b\u306e\u304b\uff1f<\/h3>\n<h4>\u00a0\u672c\u6765\u306e\u7528\u9014<\/h4>\n<p>MAC\u30a2\u30c9\u30ec\u30b9\u307e\u3067\u6307\u5b9a\u3057\u3066\u30e6\u30fc\u30b6\u30fc\u304c\u901a\u4fe1\u3059\u308b\u306e\u306f\u8ca0\u62c5\u304c\u5927\u304d\u3059\u304e\u307e\u3059\u3002<\/p>\n<h4 class=\"p1\"><span class=\"s1\">IP<\/span>\u30a2\u30c9\u30ec\u30b9\u306e\u91cd\u8907\u78ba\u8a8d<span class=\"s1\">(GARP)<\/span><\/h4>\n<ul>\n<li class=\"p1\">DHCP\u3067IP\u30a2\u30c9\u30ec\u30b9\u3092\u81ea\u52d5\u5272\u308a\u5f53\u3066\u3059\u308b\u969b\u306b\u65e2\u306b\u5229\u7528\u3055\u308c\u3066\u3044\u308bIP\u3067\u306f\u306a\u3044\u304b\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3002<\/li>\n<li class=\"p2\"><span class=\"s1\">ARP<\/span>\u8981\u6c42\u30d1\u30b1\u30c3\u30c8\u3092\u9001\u3063\u3066\u8fd4\u3063\u3066\u3053\u306a\u3051\u308c\u3070\u65e2\u306b\u5229\u7528\u3055\u308c\u3066\u3044\u308b<span class=\"s1\">IP<\/span>\u3060\u3068\u307f\u306a\u3059\u3002<\/li>\n<\/ul>\n<h4 class=\"p1\">\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u76e3\u8996<\/h4>\n<ul>\n<li class=\"p1\">\u751f\u5b58\u78ba\u8a8d\u306f\u3001<span class=\"s1\">ping<\/span>\u3092\u4f7f\u3063\u305f\u308a\u3057\u307e\u3059\u304c\u3001\u540c\u3058\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u3067\u5fdc\u7b54\u78ba\u8a8d\u3092\u3059\u308b\u5834\u5408\u306f<span class=\"s1\">ARP<\/span>\u3092\u4f7f\u3063\u3066\u751f\u5b58\u78ba\u8a8d\u3092\u884c\u3046\u3002<\/li>\n<\/ul>\n<h4 class=\"p1\">\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u6a5f\u5668\u306e\u30d5\u30a7\u30fc\u30eb\u30aa\u30fc\u30d0\u30fc\u767a\u751f\u901a\u77e5<\/h4>\n<p class=\"p1\">\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u6a5f\u5668\u3092\u5197\u9577\u69cb\u6210\u306b\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u4e3b\u304b\u3089\u526f\u306b\u5207\u308a\u66ff\u308f\u308b\u3053\u3068\u306b\u306a\u308b\u3002\u305d\u306e\u969b\u306f\u3001IP\u30a2\u30c9\u30ec\u30b9\u306f\u305d\u306e\u307e\u307e\u3067MAC\u30a2\u30c9\u30ec\u30b9\u3060\u3051\u5909\u308f\u308b\u5834\u5408\u304c\u3042\u308b\u3002\u305d\u306e\u5834\u5408\u3001\u30db\u30b9\u30c8\u9593\u306b\u3042\u308b\u30b9\u30a4\u30c3\u30c1\u30f3\u30b0\u30cf\u30d6\u306bMAC\u30a2\u30c9\u30ec\u30b9\u304c\u5909\u308f\u3063\u305f\u3053\u3068\u3092\u4f1d\u3048\u3066\u5b66\u7fd2\u3055\u305b\u307e\u3059\u3002<span class=\"s1\">GARP<\/span>\u3092\u9001\u3063\u3066\u3001\u30a2\u30c9\u30ec\u30b9\u30c6\u30fc\u30d6\u30eb\u3092\u66f8\u304d\u63db\u3048\u307e\u3059\u3002<\/p>\n<h2>DHCP<\/h2>\n<h3>DCHP\u30b5\u30fc\u30d0\u306b\u3088\u3063\u3066\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u81ea\u52d5\u8a2d\u5b9a\u3055\u308c\u308b\u9805\u76ee<\/h3>\n<ul>\n<li>DHCP\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306eIP\u30a2\u30c9\u30ec\u30b9<\/li>\n<li>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af<\/li>\n<li>\u30c7\u30d5\u30a9\u30eb\u30c8\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u306eIP\u30a2\u30c9\u30ec\u30b9<\/li>\n<li>DNS\u30b5\u30fc\u30d0\u306eIP\u30a2\u30c9\u30ec\u30b9<\/li>\n<\/ul>\n<h3>IP\u30a2\u30c9\u30ec\u30b9\u306e\u5272\u308a\u5f53\u3066<\/h3>\n<p>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u7aef\u672b\u306eIP\u30a2\u30c9\u30ec\u30b9\u304c\u672a\u5b9a\u3067\u3042\u308b\u95a2\u4fc2\u3067\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u30d1\u30b1\u30c3\u30c8\u3092\u4f7f\u7528\u3057\u3066DHCP\u30b5\u30fc\u30d0\u3068\u306e\u901a\u4fe1\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n<h4>DHCP\u30ea\u30ec\u30fc\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8<\/h4>\n<p>\u7ba1\u7406\u4e0b\u306e\u30eb\u30fc\u30bf\u30fc\u5916\u306eDHCP\u30b5\u30fc\u30d0\u306b\u5bfe\u3057\u3066IP\u30a2\u30c9\u30ec\u30b9\u306e\u554f\u3044\u5408\u308f\u305b\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u6a5f\u80fd\u3067\u3059\u3002\u4e00\u822c\u7684\u306b\u306f\u30eb\u30fc\u30bf\u4e0a\u3067\u30ea\u30ec\u30fc\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8\u6a5f\u80fd\u3092\u52d5\u4f5c\u3055\u305b\u307e\u3059\u3002<\/p>\n<h3>\u4f7f\u7528\u3059\u308b\u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u30dd\u30fc\u30c8<\/h3>\n<h4>\u4f7f\u7528\u30d7\u30ed\u30c8\u30b3\u30eb<\/h4>\n<p>DHCP\u306e\u30b7\u30fc\u30b1\u30f3\u30b9\u4e2d\u3067\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u304c\u4f7f\u7528\u3055\u308c\u308b\u305f\u3081<span style=\"color: #ff0000;\"><strong>UDP<\/strong><\/span>\u3092\u4f7f\u3044\u307e\u3059\u3002\uff08TCP\u3067\u306f\u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u3092\u78ba\u7acb\u3059\u308b\u65b9\u5f0f\u306e\u305f\u3081\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u3084\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u304c\u4f7f\u3048\u306a\u3044\u305f\u3081\u3002\uff09<\/p>\n<h4>\u4f7f\u7528\u30dd\u30fc\u30c8\uff08\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u2192\u30b5\u30fc\u30d0\uff09<\/h4>\n<p>UDP\/67<\/p>\n<h4>\u4f7f\u7528\u30dd\u30fc\u30c8\uff08\u30b5\u30fc\u30d0\u2192\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\uff09<\/h4>\n<p>UDP\/68<\/p>\n<h3>DHCP\u306e\u51e6\u7406\u306e\u6d41\u308c<\/h3>\n<ol>\n<li>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306fDHCP DISCOVER\u3059\u308b\u3002<\/li>\n<li>DHCP\u30b5\u30fc\u30d0\u304b\u3089\u8907\u6570\u306eDHCP OFFER\u304c\u8fd4\u3055\u308c\u308b\u3002<\/li>\n<li>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306fDHCP OFFER\u306b\u542b\u307e\u308c\u308b\u300c\u9001\u4fe1\u5143DHCP\u30b5\u30fc\u30d0\u306eIP\u30a2\u30c9\u30ec\u30b9\u300d\u3068\u300c\u63d0\u6848\u3055\u308c\u305fIP\u30a2\u30c9\u30ec\u30b9\u300d\u3092\u683c\u7d0d\u3057\u305fDHCP REQUEST\u3092\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u3059\u308b\u3002<\/li>\n<li>DHCP REQUEST\u3092\u53d7\u4fe1\u3057\u305fDHCP\u30b5\u30fc\u30d0\u306f\u30d1\u30b1\u30c3\u30c8\u5185\u5bb9\u3092\u78ba\u8a8d\u3057\u3001\u81ea\u8eab\u306e\u63d0\u6848\u304c\u53d7\u3051\u308c\u3089\u308c\u305f\u306a\u3089\u3070DHCP ACK\u3067\u69cb\u6210\u60c5\u5831\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u901a\u77e5\u3059\u308b\u3002<\/li>\n<li>\u305d\u3046\u3067\u306a\u3051\u308c\u3070\u81ea\u8eab\u306e\u63d0\u6848\u304c\u7834\u68c4\u3055\u308c\u305f\u3068\u5224\u65ad\u3057DHCP REQUEST\u3092\u7121\u8996\u3059\u308b\u3002<\/li>\n<\/ol>\n<h2>NAT\u3068\u306f\uff1f<\/h2>\n<p>\u4f01\u696d\u5185\u306e\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u304b\u3089\u30b0\u30ed\u30fc\u30d0\u30ebIP\u306b\u5909\u63db\u3068\u305d\u306e\u9006\u3082\u3057\u3066\u304f\u308c\u3066\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3067\u60c5\u5831\u304c\u8fd4\u3063\u3066\u304f\u308b\u3068\u304d\u306e\u7d4c\u8def\u60c5\u5831\u306e\u78ba\u4fdd\u3092\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n<h3>\u5177\u4f53\u7684\u306b\u306f<\/h3>\n<p>\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306e\u7aef\u672bA\u304b\u3089\u5916\u90e8\u306bHTTP\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u9001\u308b\u3068\u304d\u306b\u3001<span style=\"color: #ff0000;\"><strong>\u9001\u4fe1\u5143IP\u30a2\u30c9\u30ec\u30b9\u3092\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9\u304b\u3089\u30b0\u30ed\u30fc\u30d0\u30ebIP\u30a2\u30c9\u30ec\u30b9\u306b\u5909\u63db<\/strong><\/span>\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n<p>\u305d\u308c\u3092\u53d7\u3051\u305f\u5916\u90e8\u306eWeb\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u3001\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u7aef\u672bA\u306b\u8fd4\u3063\u3066\u304f\u308b\u6642\u306f\u3001\u9001\u4fe1\u5143IP\u30a2\u30c9\u30ec\u30b9\u306b\u9001\u3089\u308c\u305f\u30b0\u30ed\u30fc\u30d0\u30ebIP\u30a2\u30c9\u30ec\u30b9\u5b9b\u306b\u9001\u4fe1\u3055\u308c\u3066\u3001NAT\u6a5f\u80fd\u3092\u6301\u3063\u305f\u30eb\u30fc\u30bf\u30fc\u304c\u518d\u5ea6\u3001<span style=\"color: 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