{"id":7098,"date":"2025-10-05T08:30:00","date_gmt":"2025-10-04T23:30:00","guid":{"rendered":"https:\/\/blog.since2020.jp\/?p=7098"},"modified":"2025-09-30T16:01:00","modified_gmt":"2025-09-30T07:01:00","slug":"subnet-mask_glossary","status":"publish","type":"post","link":"https:\/\/since2020.jp\/media\/subnet-mask_glossary\/","title":{"rendered":"\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u518d\u8003\uff1aIPv4\u306e\u57fa\u790e\u304b\u3089VLSM\u3001\u81ea\u52d5\u5316\u306e\u672a\u6765\u307e\u3067"},"content":{"rendered":"\n<p>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u57fa\u672c\u6982\u5ff5\u304b\u3089\u5fdc\u7528\u5206\u91ce\u3001\u30e1\u30ea\u30c3\u30c8\u30fb\u30c7\u30e1\u30ea\u30c3\u30c8\u3001\u5c06\u6765\u5c55\u671b\u307e\u3067\u3092\u521d\u5fc3\u8005\u5411\u3051\u306b\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u3092\u6df1\u304f\u7406\u89e3\u3057\u3001\u5b9f\u969b\u306e\u30d3\u30b8\u30cd\u30b9\u3084\u7814\u7a76\u306b\u5f79\u7acb\u3066\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n<h2>\u306f\u3058\u3081\u306b\uff1a\u306a\u305c\u4eca\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u304c\u4fa1\u5024\u3092\u9ad8\u3081\u3066\u3044\u308b\u306e\u304b<\/h2>\n<p>\u304b\u3064\u3066\u300c\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\uff1dIP\u30a2\u30c9\u30ec\u30b9\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\uff0f\u30db\u30b9\u30c8\u90e8\u306e\u5883\u754c\u300d\u3068\u3057\u3066\u65ad\u7247\u7684\u306b\u7406\u89e3\u3055\u308c\u304c\u3061\u3067\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u3053\u3053\u6570\u5e74\u3067CIDR\uff08\u30af\u30e9\u30b9\u30ec\u30b9\uff09\u3001VLSM\uff08\u53ef\u5909\u9577\u30de\u30b9\u30af\uff09\u3001\u3055\u3089\u306bTerraform\u3084Ansible\u306a\u3069\u306e\u81ea\u52d5\u5316\u30c4\u30fc\u30eb\u3068\u306e\u878d\u5408\u304c\u9032\u307f\u3001<span data-token-index=\"1\" class=\"notion-enable-hover\">\u52b9\u7387\u30fb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30fb\u904b\u7528\u6027\u306e\u4e09\u62cd\u5b50\u304c\u63c3\u3063\u305f\u91cd\u8981\u6280\u8853<\/span>\u3068\u3057\u3066\u518d\u8a55\u4fa1\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\r\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u3001\u57fa\u672c\u304b\u3089\u5b9f\u8df5\u3001\u3055\u3089\u306b\u306f\u30af\u30e9\u30a6\u30c9\uff0fSD\u2011WAN\u74b0\u5883\u3067\u306e\u5fdc\u7528\u307e\u3067\u3001\u4eba\u9593\u5473\u3092\u6301\u3063\u3066\u4e01\u5be7\u306b\u89e3\u304d\u307b\u3050\u3057\u307e\u3059\u3002<!-- notionvc: 48b018e3-6a6d-4f08-a277-997e0ecc33a0 --><\/p>\n\n<h2>1. \u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306e\u9aa8\u683c\u3092\u89e3\u5256<\/h2>\n<b>1.1 32\u30d3\u30c3\u30c8\u306e\u4ed5\u7d44\u307f\u3068CIDR\u8868\u8a18<\/b>\r\n<p>\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306f32\u30d3\u30c3\u30c8\u306e\u30d3\u30c3\u30c8\u30de\u30b9\u30af\u3002CIDR\u8868\u8a18\u3067\u306f\u300c\/24\u300d\u300c\/26\u300d\u306a\u3069\u3001\u524d\u65b9\u306e1\u306e\u6570\u3067\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u90e8\u3092\u793a\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u300c255.255.255.0 (\/24)\u300d\u306a\u3089\u5148\u982d24\u30d3\u30c3\u30c8\u304c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u90e8\u3067\u3059\u3002IP\u30a2\u30c9\u30ec\u30b9\u3068\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u306eAND\u6f14\u7b97\u306b\u3088\u308a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a2\u30c9\u30ec\u30b9\u304c\u6c7a\u5b9a\u3055\u308c\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u5224\u65ad\u6750\u6599\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\r\n<b>1.2 \u30af\u30e9\u30b9\u30d5\u30eb vs \u30af\u30e9\u30b9\u30ec\u30b9<\/b>\r\n<p>\u5f93\u6765\u306e\u30af\u30e9\u30b9A\/B\/C\u306f\u56fa\u5b9a\u306e\u30de\u30b9\u30af\u9577\u3092\u524d\u63d0\u3068\u3057\u3066\u3044\u307e\u3057\u305f\u304c\u3001\u73fe\u4ee3\u3067\u306fCIDR\u306b\u3088\u308a\u67d4\u8edf\u306a\u8868\u73fe\u304c\u4e3b\u6d41\u3067\u3059\u3002\u305f\u3060\u3001\u30af\u30e9\u30b9\u306e\u6982\u5ff5\u306f\u7406\u89e3\u306e\u8d77\u70b9\u3068\u3057\u3066\u91cd\u8981\u3067\u3059\u3002\u7279\u306b\u300c\/8, \/16, \/24\u300d\u3068\u3044\u3063\u305f\u30de\u30b9\u30af\u9577\u306e\u611f\u899a\u3092\u3064\u304b\u3080\u969b\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\r\n<hr \/>\r\n<p><!-- notionvc: 09b79e77-059f-4219-bc62-19a9d978be54 --><\/p>\n\n<h2>2. \u8cc7\u6e90\u52b9\u7387\u3068\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u6027\u80fd\u306e\u6700\u9069\u5316<\/h2>\n<b>2.1 \u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u30c9\u30e1\u30a4\u30f3\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/b>\r\n<p>\u5927\u898f\u6a21\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u306f\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u304c\u81a8\u308c\u4e0a\u304c\u308a\u3001\u6027\u80fd\u304c\u4f4e\u4e0b\u3057\u307e\u3059\u3002\u30b5\u30d6\u30cd\u30c3\u30c8\u3067\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u30c9\u30e1\u30a4\u30f3\u3092\u5206\u5272\u3059\u308c\u3070\u3001\u52b9\u7387\u7684\u306a\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3068\u901a\u4fe1\u5236\u5fa1\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\r\n<b>2.2 \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30be\u30fc\u30cb\u30f3\u30b0<\/b>\r\n<p>\u90e8\u7f72\u3084\u30a2\u30d7\u30ea\u3054\u3068\u306b\u30b5\u30d6\u30cd\u30c3\u30c8\u3092\u5206\u5272\u3002\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3067\u660e\u78ba\u306a\u30a2\u30af\u30bb\u30b9\u5236\u5fa1\u304c\u884c\u3048\u308b\u3088\u3046\u306b\u306a\u308a\u3001\u5185\u90e8\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u5f37\u5316\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001HR\u90e8\u9580\u3060\u3051\u5225\u30de\u30b9\u30af\u3092\u5272\u308a\u5f53\u3066\u3001ACL\u3067\u9694\u96e2\u3059\u308b\u8a2d\u8a08\u304c\u5178\u578b\u3067\u3059\u3002<\/p>\r\n<p><!-- notionvc: 6100d880-1c64-4cab-9526-ee006d723192 --><\/p>\n\n<h2>3. \u73fe\u5834\u306e\u8a2d\u8a08\u30d5\u30ed\u30fc\uff1a5\u3064\u306e\u30b9\u30c6\u30c3\u30d7<\/h2>\n<ol>\r\n\t<li><strong>\u8981\u4ef6\u6574\u7406<\/strong>\uff1a\u30db\u30b9\u30c8\u53f0\u6570\u30fb\u5c06\u6765\u7684\u62e1\u5f35\u30fb\u904b\u7528\u30dd\u30ea\u30b7\u30fc\u306a\u3069\u3092\u53ef\u8996\u5316\u3002<\/li>\r\n\t<li><strong>\u30db\u30b9\u30c8\u6570\u306b\u57fa\u3065\u304f\u30de\u30b9\u30af\u8a2d\u8a08<\/strong>\uff1a2^h\u20112 \u516c\u5f0f\u3067\u5fc5\u8981\u30d3\u30c3\u30c8\u6570\u3092\u7b97\u51fa\u3002\u00a0\r\n\r\n<ol style=\"list-style-type: lower-alpha;\">\r\n\t<li><strong>\u30b5\u30d6\u30cd\u30c3\u30c8\u6570\u306b\u5fdc\u3058\u305f\u30d3\u30c3\u30c8\u62e1\u5f35<\/strong>\uff1a2^s \u30b5\u30d6\u30cd\u30c3\u30c8\u6570\u7528\u306a\u3069\u3002<\/li>\r\n\t<li><strong>CIDR\u306b\u3088\u308b\u7bc4\u56f2\u7ba1\u7406\u3068\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u5272\u5f53<\/strong>\uff1aRFC1918\uff0810.\/8, 172.16\u201331\/12, 192.168\/16\uff09\u306b\u6e96\u62e0<\/li>\r\n\t<li><strong>\u30b3\u30fc\u30c9\u7ba1\u7406\u2192\u81ea\u52d5\u5316<\/strong>\uff1aTerraform\u3084Ansible\u3067\u30de\u30b9\u30af\u8a2d\u8a08\u3092\u30b3\u30fc\u30c9\u5316\u3002\u5909\u66f4\u8ffd\u8de1\u3068\u30ec\u30d3\u30e5\u30fc\u304c\u53ef\u80fd\u3002<\/li>\r\n<\/ol>\r\n<\/li>\r\n<\/ol>\r\n<p><!-- notionvc: 56433a37-8195-46b7-a56a-93351e8da9dd --><\/p>\n\n<h2>4. VLSM\u3092\u5236\u3059\u308b\u8005\u304cIPv4\u3092\u5236\u3059<\/h2>\n<b>4.1 VLSM\u306e\u771f\u4fa1<\/b>\r\n<p>VLSM\uff08\u53ef\u5909\u9577\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\uff09\u306f\u3001\u7528\u9014\u3084\u30db\u30b9\u30c8\u6570\u306b\u5fdc\u3058\u3066\u30b5\u30d6\u30cd\u30c3\u30c8\u9577\u3092\u5909\u5316\u3055\u305b\u3089\u308c\u308b\u624b\u6cd5\u3002\u56fa\u5b9a\u9577\u3088\u308a\u3082IP\u6d6a\u8cbb\u3092\u6291\u3048\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u7c92\u5ea6\u3092\u6700\u9069\u5316\u3002<\/p>\r\n<b>4.2 \u5c0e\u5165\u4f8b<\/b>\r\n<p>\u30af\u30e9\u30b9C\uff08\/24\uff09\u5185\u30673\u3064\u306e\u30b5\u30d6\u30cd\u30c3\u30c8\u304c\u5fc5\u8981\u306a\u72b6\u6cc1\u3067\u3001\u30db\u30b9\u30c8\u6570\u306b\u57fa\u3065\u304d\u300c\/25\u300d\u300c\/26\u300d\u300c\/27\u300d\u3068\u53ef\u5909\u30de\u30b9\u30af\u3092\u9069\u7528\u3002\u5927\u898f\u6a21\u4e8b\u696d\u6240\u304b\u3089\u30ea\u30e2\u30fc\u30c8\u62e0\u70b9\u3001IoT\u7aef\u672b\u306a\u3069\u591a\u69d8\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u69cb\u6210\u306b\u5bfe\u5fdc\u3067\u304d\u308b\u3002<\/p>\r\n<b>4.3 \u904b\u7528\u4e0a\u306e\u7559\u610f\u70b9<\/b>\r\n<p>VLSM\u306f\u8a08\u753b\u3068\u904b\u7528\u304c\u91cd\u8981\u3002\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u30d7\u30ed\u30c8\u30b3\u30eb\uff08OSPF\u3001EIGRP\u7b49\uff09\u306e\u652f\u63f4\u304c\u5fc5\u8981\u3002\u8a2d\u8a08\u30df\u30b9\u306f\u901a\u4fe1\u65ad\u3084\u91cd\u8907\u30a2\u30c9\u30ec\u30b9\u306b\u3064\u306a\u304c\u308b\u305f\u3081\u3001\u30ec\u30d3\u30e5\u30fc\u3068\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u7ba1\u7406\u3092\u5fb9\u5e95\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\r\n<p><!-- notionvc: b2f069cd-38b2-4d9c-9a48-36b875846fd4 --><\/p>\n\n<h2>5. \u30af\u30e9\u30a6\u30c9\u30fbSD\u2011WAN\u6642\u4ee3\u306e\u5fdc\u7528<\/h2>\n<b>5.1 AWS\/Azure\u306eVPC\u8a2d\u8a08<\/b>\r\n<p>AWS\u306a\u3069\u3067\u306fVPC\u3054\u3068\u306b\u30b5\u30d6\u30cd\u30c3\u30c8\u3092\u5206\u5272\u3002\u30d1\u30d6\u30ea\u30c3\u30af\uff0f\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u7528\u3001VPN\u63a5\u7d9a\u5411\u3051\u306a\u3069\u3001\u5229\u7528\u5c40\u9762\u306b\u5fdc\u3058\u305f\u30de\u30b9\u30af\u8a2d\u8a08\u304c\u6c42\u3081\u3089\u308c\u307e\u3059\u3002CIDR\u30d6\u30ed\u30c3\u30af\u306e\u8a2d\u8a08\u30df\u30b9\u3067\u5f8c\u306e\u62e1\u5f35\u304c\u56f0\u96e3\u306b\u306a\u308b\u305f\u3081\u3001\u521d\u671f\u6bb5\u968e\u304b\u3089\u5c06\u6765\u69cb\u6210\u3092\u898b\u636e\u3048\u308b\u3079\u304d\u30dd\u30a4\u30f3\u30c8\u3067\u3059\u3002<\/p>\r\n<b>5.2 SD\u2011WAN\u306b\u304a\u3051\u308b\u5206\u5272\u8a2d\u8a08<\/b>\r\n<p>\u652f\u793e\u3084\u62e0\u70b9\u3054\u3068\u306b\u30b5\u30d6\u30cd\u30c3\u30c8\u5206\u5272\u3057\u3001\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u306e\u7d4c\u8def\u5236\u5fa1\u3084\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30dd\u30ea\u30b7\u30fc\u306b\u5fdc\u3058\u3066\u52d5\u7684\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3092\u53cd\u6620\u3002\u30b5\u30d6\u30cd\u30c3\u30c8\u30de\u30b9\u30af\u304c\u30a4\u30f3\u30d5\u30e9\u306e\u53ef\u8996\u6027\u3068\u5236\u5fa1\u6027\u3092\u652f\u3048\u307e\u3059\u3002<\/p>\r\n<p><!-- notionvc: e820b276-279f-4f1e-8fb2-f3777bc25492 --><\/p>\n\n<h2>6. \u30e1\u30ea\u30c3\u30c8\u30fb\u6ce8\u610f\u70b9\u306e\u6574\u7406<\/h2>\n<b>\u30e1\u30ea\u30c3\u30c8<\/b>\r\n<ul>\r\n\t<li><strong>IP\u30ea\u30bd\u30fc\u30b9\u306e\u6700\u5927\u52b9\u7387\u5316<\/strong>\uff1a\u7279\u306bIPv4\u67af\u6e07\u72b6\u6cc1\u4e0b\u3067\u91cd\u8981\u3002<\/li>\r\n\t<li><strong>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u6027\u80fd\u5411\u4e0a<\/strong>\uff1a\u5c0f\u3055\u3044\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u30c9\u30e1\u30a4\u30f3\u3001\u660e\u78ba\u306a\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3002<\/li>\r\n\t<li><strong>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5f37\u5316<\/strong>\uff1a\u30be\u30fc\u30cb\u30f3\u30b0\u306e\u5bb9\u6613\u5316\u3002<\/li>\r\n<\/ul>\r\n<b>\u30c7\u30e1\u30ea\u30c3\u30c8<\/b>\r\n<ul>\r\n\t<li><strong>\u8a2d\u8a08\u306e\u8907\u96d1\u5316<\/strong>\uff1aCIDR\/VLSM\u306f\u521d\u5fc3\u8005\u306b\u306f\u30cf\u30fc\u30c9\u30eb\u304c\u9ad8\u3044\u3002<\/li>\r\n\t<li><strong>\u8a2d\u5b9a\u30df\u30b9\u306e\u5f71\u97ff\u5927<\/strong>\uff1a\u30a2\u30c9\u30ec\u30b9\u91cd\u8907\u3001\u901a\u4fe1\u906e\u65ad\u306a\u3069\u306e\u30ea\u30b9\u30af\u3002<\/li>\r\n\t<li><strong>\u904b\u7528\u8ca0\u8377\u306e\u5897\u52a0<\/strong>\uff1a\u518d\u8a2d\u8a08\u3084\u62e1\u5f35\u6642\u306b\u5168\u4f53\u898b\u76f4\u3057\u304c\u5fc5\u8981\u3002<\/li>\r\n<\/ul>\r\n<p><!-- 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