{"id":197,"date":"2025-05-11T12:01:00","date_gmt":"2025-05-11T03:01:00","guid":{"rendered":"https:\/\/ccna-curriculum.tech-village.co.jp\/?p=197"},"modified":"2025-10-15T15:02:04","modified_gmt":"2025-10-15T06:02:04","slug":"nat","status":"publish","type":"post","link":"https:\/\/ccna-curriculum.tech-village.co.jp\/?p=197","title":{"rendered":"NAT\uff08\u57fa\u790e\uff09"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">NAT\u3068\u306f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><span class=\"swl-marker mark_yellow\">NAT\uff08Network Address Translation\uff09<\/span><\/strong>\u306f IP\u30a2\u30c9\u30ec\u30b9\u3092\u5909\u63db\u3059\u308b\u6280\u8853 \u306e\u3053\u3068\u3067\u3059\u3002<br>\u7279\u306b\u4e00\u822c\u7684\u306b\u306f\u3001<strong><span class=\"swl-marker mark_yellow\">\u4f01\u696dLAN\u3067\u4f7f\u308f\u308c\u308b \u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9 \u3092\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u901a\u4fe1\u306b\u5fc5\u8981\u306a \u30b0\u30ed\u30fc\u30d0\u30ebIP\u30a2\u30c9\u30ec\u30b9 \u306b\u5909\u63db\u3059\u308b<\/span><\/strong>\u4ed5\u7d44\u307f\u3068\u3057\u3066\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u3067\u306f\u3059\u3079\u3066\u306e\u6a5f\u5668\u306b\u30b0\u30ed\u30fc\u30d0\u30ebIP\u304c\u5fc5\u8981\u3067\u3059\u304c\u3001\u4f01\u696d\u3084\u5bb6\u5ead\u5185\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u306f\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u304c\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001LAN\u5185\u306ePC\u304c\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306b\u63a5\u7d9a\u3059\u308b\u969b\u306b\u306f\u3001\u30eb\u30fc\u30bf\u306a\u3069\u3067NAT\u3092\u7528\u3044\u3066\u30a2\u30c9\u30ec\u30b9\u5909\u63db\u3092\u884c\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">NAT\u306e\u7279\u5fb4<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">NAT\u306f\u3001\u4e3b\u306b <strong><span class=\"swl-marker mark_yellow\">IP\u30d1\u30b1\u30c3\u30c8\u306e\u30d8\u30c3\u30c0\u306b\u542b\u307e\u308c\u308b\u9001\u4fe1\u5143IP\u30a2\u30c9\u30ec\u30b9<\/span><\/strong> \u3092\u5909\u63db\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5185\u90e8LAN\u304b\u3089\u5916\u90e8\uff08\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\uff09\u3078\u901a\u4fe1\u3092\u51fa\u3059\u3068\u304d \u2192 \u9001\u4fe1\u5143IP\u30a2\u30c9\u30ec\u30b9\u304c\u5909\u63db\u3055\u308c\u308b<\/li>\n\n\n\n<li>\u5916\u90e8\u304b\u3089\u5185\u90e8\u3078\u623b\u3063\u3066\u304f\u308b\u3068\u304d \u2192 \u5b9b\u5148IP\u30a2\u30c9\u30ec\u30b9\u304c\u5909\u63db\u3055\u308c\u308b<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u306b\u3088\u308a\u3001LAN\u5185\u306ePC\u306f\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u306e\u307e\u307e\u3067\u3082\u3001\u5916\u90e8\u3068\u306f\u30b0\u30ed\u30fc\u30d0\u30ebIP\u3067\u3084\u308a\u3068\u308a\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">NAT\u306e\u30e1\u30ea\u30c3\u30c8<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b0\u30ed\u30fc\u30d0\u30ebIP\u30a2\u30c9\u30ec\u30b9\u306e\u7bc0\u7d04\u304c\u3067\u304d\u308b<\/li>\n\n\n\n<li>\u5185\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u69cb\u6210\u3092\u5916\u90e8\u304b\u3089\u96a0\u305b\u308b\u305f\u3081\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u304c\u5411\u4e0a\u3059\u308b<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">NAT\u306e\u30c7\u30e1\u30ea\u30c3\u30c8<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e00\u90e8\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306f\u6b63\u5e38\u306b\u52d5\u4f5c\u3057\u306a\u3044\u5834\u5408\u304c\u3042\u308b<br>\uff08L7\uff1d\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5c64\u306e\u30c7\u30fc\u30bf\u5185\u306bIP\u30a2\u30c9\u30ec\u30b9\u304c\u57cb\u3081\u8fbc\u307e\u308c\u3066\u3044\u308b\u30b1\u30fc\u30b9\u306a\u3069\uff09<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Cisco\u306b\u304a\u3051\u308bNAT\u7528\u8a9e<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cisco\u30eb\u30fc\u30bf\u3067\u306f\u3001NAT\u306e\u52d5\u4f5c\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u4ee5\u4e0b\u306e\u7528\u8a9e\u304c\u4f7f\u308f\u308c\u307e\u3059\u3002\u30b9\u30c6\u30fc\u30bf\u30b9\u8868\u793a\u306b\u3082\u51fa\u3066\u304f\u308b\u305f\u3081\u3001\u610f\u5473\u3092\u6b63\u3057\u304f\u899a\u3048\u308b\u3053\u3068\u304c\u5927\u5207\u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>NAT\u7528\u8a9e<\/th><th>Cisco\u3067\u306e\u8868\u793a<\/th><th>\u610f\u5473<\/th><\/tr><\/thead><tbody><tr><td>\u5185\u90e8\u30ed\u30fc\u30ab\u30eb\u30a2\u30c9\u30ec\u30b9<\/td><td>Inside local<\/td><td>\u5185\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u30db\u30b9\u30c8\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u308bIP\uff08\u901a\u5e38\u306f\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\uff09<\/td><\/tr><tr><td>\u5185\u90e8\u30b0\u30ed\u30fc\u30d0\u30eb\u30a2\u30c9\u30ec\u30b9<\/td><td>Inside global<\/td><td>\u5916\u90e8\u304b\u3089\u898b\u305f\u5185\u90e8\u30db\u30b9\u30c8\u306eIP\uff08\u901a\u5e38\u306fISP\u304b\u3089\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u30b0\u30ed\u30fc\u30d0\u30ebIP\uff09<\/td><\/tr><tr><td>\u5916\u90e8\u30ed\u30fc\u30ab\u30eb\u30a2\u30c9\u30ec\u30b9<\/td><td>Outside local<\/td><td>\u5185\u90e8\u304b\u3089\u898b\u305f\u5916\u90e8\u30db\u30b9\u30c8\u306eIP\uff08\u901a\u5e38\u306f\u30b0\u30ed\u30fc\u30d0\u30ebIP\u3068\u540c\u3058\uff09<\/td><\/tr><tr><td>\u5916\u90e8\u30b0\u30ed\u30fc\u30d0\u30eb\u30a2\u30c9\u30ec\u30b9<\/td><td>Outside global<\/td><td>\u5b9f\u969b\u306b\u5916\u90e8\u30db\u30b9\u30c8\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u305fIP\uff08\u901a\u5e38\u306f\u30b0\u30ed\u30fc\u30d0\u30ebIP\uff09<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Cisco\u6a5f\u5668\u3067\u306f\u3001<code>ip nat inside<\/code> \u3068\u8a2d\u5b9a\u3057\u305f\u5074\u304c\u300c\u5185\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u300d\u3001<code>ip nat outside<\/code> \u3068\u8a2d\u5b9a\u3057\u305f\u5074\u304c\u300c\u5916\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u300d\u3068\u5b9a\u7fa9\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u30eb\u30fc\u30eb\u306b\u4f8b\u5916\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u3053\u3067\u300c\u30ed\u30fc\u30ab\u30eb\u300d\u3068\u306f \u5185\u90e8\u304b\u3089\u898b\u305f\u8868\u73fe\u3001\u300c\u30b0\u30ed\u30fc\u30d0\u30eb\u300d\u3068\u306f \u5916\u90e8\u306b\u516c\u958b\u3055\u308c\u308b\u8868\u73fe \u3068\u3044\u3046\u610f\u5473\u3067\u7406\u89e3\u3059\u308b\u3068\u6574\u7406\u3057\u3084\u3059\u3044\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">NAT\u306e\u5b9f\u969b\u306e\u5229\u7528<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">NAT\u3084NAPT\u3067\u306f\u3001\u4e3b\u306b <strong>\u9001\u4fe1\u5143\u30a2\u30c9\u30ec\u30b9\u306e\u5909\u63db<\/strong> \u3092\u884c\u3044\u307e\u3059\u3002<br>\u3053\u306e\u5834\u5408\u3001\u610f\u8b58\u3059\u3079\u304d\u306f\u4ee5\u4e0b\u306e3\u7a2e\u985e\u3067\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5185\u90e8\u30ed\u30fc\u30ab\u30eb\u30a2\u30c9\u30ec\u30b9<\/li>\n\n\n\n<li>\u5185\u90e8\u30b0\u30ed\u30fc\u30d0\u30eb\u30a2\u30c9\u30ec\u30b9<\/li>\n\n\n\n<li>\u5916\u90e8\u30b0\u30ed\u30fc\u30d0\u30eb\u30a2\u30c9\u30ec\u30b9<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u65b9\u3001\u5916\u90e8\u30ed\u30fc\u30ab\u30eb\u30a2\u30c9\u30ec\u30b9\u3068\u5916\u90e8\u30b0\u30ed\u30fc\u30d0\u30eb\u30a2\u30c9\u30ec\u30b9\u306f\u540c\u3058\u5024\u3068\u306a\u308b\u305f\u3081\u3001Cisco\u6a5f\u5668\u306e\u30b9\u30c6\u30fc\u30bf\u30b9\u78ba\u8a8d\u3067\u306f\u533a\u5225\u3055\u308c\u306a\u3044\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u5bfe\u7b56\uff1a\u300cNAT\u306b\u3088\u3063\u3066\u5909\u63db\u3055\u308c\u308b\u306e\u306f\u3069\u306e\u30a2\u30c9\u30ec\u30b9\u304b\u300d\u300cCisco\u306b\u304a\u3051\u308bInside\/Outside Local\/Global\u306e\u610f\u5473\u306f\u4f55\u304b\u300d\u304c\u3088\u304f\u554f\u308f\u308c\u308b\u305f\u3081\u3001\u3053\u306e\u7528\u8a9e\u6574\u7406\u3092\u3057\u3063\u304b\u308a\u62bc\u3055\u3048\u3066\u304a\u304f\u3053\u3068\u304c\u5408\u683c\u3078\u306e\u8fd1\u9053\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">NAT\u306e\u4ed5\u7d44\u307f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u3053\u3067\u306f\u9001\u4fe1\u5143\u30a2\u30c9\u30ec\u30b9\u5909\u63db\u3092\u884c\u3046NAT\u306e\u6d41\u308c\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5185\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306ePC\u304c\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u306e\u30b5\u30fc\u30d0\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u5834\u5408\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u9001\u4fe1\u3057\u305f\u30d1\u30b1\u30c3\u30c8\u306f\u307e\u305aNAT\u30eb\u30fc\u30bf\u306b\u5c4a\u304d\u307e\u3059\u3002NAT\u30eb\u30fc\u30bf\u306f\u3053\u306e\u3068\u304d <strong>\u9001\u4fe1\u5143IP\u30a2\u30c9\u30ec\u30b9\uff08\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\uff09\u3092\u5185\u90e8\u30b0\u30ed\u30fc\u30d0\u30eb\u30a2\u30c9\u30ec\u30b9\uff08\u30b0\u30ed\u30fc\u30d0\u30ebIP\uff09\u306b\u66f8\u304d\u63db\u3048\u3066<\/strong> \u5916\u90e8\u306b\u9001\u4fe1\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b21\u306b\u3001\u30b5\u30fc\u30d0\u304b\u3089\u306e\u8fd4\u4fe1\u30d1\u30b1\u30c3\u30c8\u304c\u623b\u3063\u3066\u304d\u305f\u5834\u5408\u3001\u5b9b\u5148\u306fNAT\u30eb\u30fc\u30bf\u304c\u4ed8\u4e0e\u3057\u305f\u30b0\u30ed\u30fc\u30d0\u30ebIP\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u305d\u3053\u3067NAT\u30eb\u30fc\u30bf\u306f\u5909\u63db\u30c6\u30fc\u30d6\u30eb\u3092\u53c2\u7167\u3057\u3001\u5b9b\u5148\u30a2\u30c9\u30ec\u30b9\u3092 <strong>\u3082\u3068\u306e\u5185\u90e8\u30ed\u30fc\u30ab\u30eb\u30a2\u30c9\u30ec\u30b9\uff08\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\uff09\u306b\u623b\u3057\u3066<\/strong> \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3078\u5c4a\u3051\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3064\u307e\u308a\u3001\u884c\u304d\u306e\u901a\u4fe1\u3067\u306f\u300c\u9001\u4fe1\u5143\u30a2\u30c9\u30ec\u30b9\u5909\u63db\u300d\u3001\u623b\u308a\u306e\u901a\u4fe1\u3067\u306f\u300c\u5b9b\u5148\u30a2\u30c9\u30ec\u30b9\u5909\u63db\u300d\u304c\u884c\u308f\u308c\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30b9\u30bf\u30c6\u30a3\u30c3\u30afNAT\u3068\u30c0\u30a4\u30ca\u30df\u30c3\u30afNAT<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">NAT\u306b\u306f\u300c1\u5bfe1\u300d\u3067\u30a2\u30c9\u30ec\u30b9\u3092\u5909\u63db\u3059\u308b\u4ed5\u7d44\u307f\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u305d\u306e\u65b9\u6cd5\u306b\u306f2\u7a2e\u985e\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30b9\u30bf\u30c6\u30a3\u30c3\u30afNAT<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b7\u30b9\u30c6\u30e0\u7ba1\u7406\u8005\u304c <strong><span class=\"swl-marker mark_yellow\">\u56fa\u5b9a\u7684\u306b1\u5bfe1\u306e\u5bfe\u5fdc\u95a2\u4fc2\u3092\u8a2d\u5b9a\u3057\u3066\u304a\u304f\u65b9\u5f0f<\/span><\/strong> \u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u3048\u3070<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5185\u90e8\u306e <code>192.168.0.1<\/code> \u3092 <code>100.1.1.1<\/code> \u306b\u5909\u63db<\/li>\n\n\n\n<li>\u5185\u90e8\u306e <code>192.168.0.2<\/code> \u3092 <code>100.1.1.2<\/code> \u306b\u5909\u63db<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3068\u3044\u3046\u3088\u3046\u306b\u3001\u30eb\u30fc\u30bf\u306b\u4e8b\u524d\u306b\u5909\u63db\u30eb\u30fc\u30eb\u3092\u767b\u9332\u3057\u3066\u304a\u304d\u307e\u3059\u3002\u7279\u5b9a\u306e\u30b5\u30fc\u30d0\uff08\u4f8b\u3048\u3070Web\u30b5\u30fc\u30d0\u3084\u30e1\u30fc\u30eb\u30b5\u30fc\u30d0\uff09\u3092\u5916\u90e8\u306b\u516c\u958b\u3059\u308b\u3068\u304d\u306b\u3088\u304f\u5229\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30c0\u30a4\u30ca\u30df\u30c3\u30afNAT<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ba1\u7406\u8005\u304c <strong><span class=\"swl-marker mark_yellow\">\u30b0\u30ed\u30fc\u30d0\u30ebIP\u30a2\u30c9\u30ec\u30b9\u306e\u30d7\u30fc\u30eb\uff08\u5229\u7528\u53ef\u80fd\u306a\u7bc4\u56f2\uff09\u3092\u8a2d\u5b9a\u3057\u3066\u304a\u304d\u3001\u5916\u90e8\u901a\u4fe1\u6642\u306b\u52d5\u7684\u306b\u5272\u308a\u5f53\u3066\u308b\u65b9\u5f0f<\/span><\/strong> \u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u3048\u3070\u3001\u5185\u90e8\u306e\u8907\u6570PC\u304c\u5916\u90e8\u3078\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3068\u304d\u306b\u3001\u7a7a\u3044\u3066\u3044\u308b\u30b0\u30ed\u30fc\u30d0\u30ebIP\u30a2\u30c9\u30ec\u30b9\u304c\u9806\u756a\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u307e\u3059\u3002\u30d7\u30fc\u30eb\u5185\u3067\u4f7f\u3048\u308bIP\u304c\u306a\u304f\u306a\u308b\u3068\u3001\u305d\u308c\u4ee5\u4e0a\u65b0\u3057\u3044\u901a\u4fe1\u306f\u3067\u304d\u306a\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u306a\u304a\u3001\u30b9\u30bf\u30c6\u30a3\u30c3\u30afNAT\u3068\u30c0\u30a4\u30ca\u30df\u30c3\u30afNAT\u304c\u4e21\u65b9\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u306f\u3001<strong><span class=\"swl-marker mark_yellow\">\u30b9\u30bf\u30c6\u30a3\u30c3\u30afNAT\u304c\u512a\u5148\u3055\u308c\u308b<\/span><\/strong> \u3068\u3044\u3046\u30eb\u30fc\u30eb\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5b9f\u969b\u306e\u5229\u7528<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9f\u969b\u306e\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u901a\u4fe1\u306b\u304a\u3044\u3066\u306f\u3001\u30b9\u30bf\u30c6\u30a3\u30c3\u30afNAT\u3084\u30c0\u30a4\u30ca\u30df\u30c3\u30afNAT\u304c\u305d\u306e\u307e\u307e\u4f7f\u308f\u308c\u308b\u3053\u3068\u306f\u5c11\u306a\u304f\u3001\u3088\u308a\u52b9\u7387\u7684\u306a <strong><span class=\"swl-marker mark_yellow\">PAT\uff08Port Address Translation\uff09<\/span><\/strong> \u304c\u4f7f\u308f\u308c\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002PAT\u306f1\u3064\u306e\u30b0\u30ed\u30fc\u30d0\u30ebIP\u30a2\u30c9\u30ec\u30b9\u3092\u8907\u6570\u306e\u5185\u90e8\u7aef\u672b\u3067\u5171\u6709\u3067\u304d\u308b\u305f\u3081\u3001\u5bb6\u5ead\u7528\u30eb\u30fc\u30bf\u304b\u3089\u4f01\u696d\u306e\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u307e\u3067\u5e83\u304f\u5229\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u5bfe\u7b56\uff1a\u300c\u30b9\u30bf\u30c6\u30a3\u30c3\u30afNAT\uff1d\u56fa\u5b9a1\u5bfe1\u300d\u300c\u30c0\u30a4\u30ca\u30df\u30c3\u30afNAT\uff1d\u30d7\u30fc\u30eb\u304b\u3089\u52d5\u7684\u306b1\u5bfe1\u300d\u300c\u5b9f\u52d9\u3067\u306fPAT\u304c\u4e3b\u6d41\u300d\u3068\u3044\u3046\u30dd\u30a4\u30f3\u30c8\u304c\u3088\u304f\u554f\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">NAPT\u3068\u306f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><span class=\"swl-marker mark_yellow\">NAPT\uff08Network Address Port Translation\uff09<\/span><\/strong>\u306f\u30011\u3064\u306e\u30b0\u30ed\u30fc\u30d0\u30ebIP\u30a2\u30c9\u30ec\u30b9\u3092\u8907\u6570\u306e\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u3067\u5171\u6709\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u6280\u8853 \u3067\u3059\u3002NAT\u304c\u30a2\u30c9\u30ec\u30b9\u3060\u3051\u3092\u5909\u63db\u3059\u308b\u306e\u306b\u5bfe\u3057\u3001NAPT\u3067\u306f <strong><span class=\"swl-marker mark_yellow\">TCP\/UDP\u306e\u30dd\u30fc\u30c8\u756a\u53f7\u3082\u540c\u6642\u306b\u5909\u63db<\/span><\/strong> \u3059\u308b\u3053\u3068\u3067\u30011\u3064\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u591a\u6570\u306e\u7aef\u672b\u304c\u4f7f\u3048\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u4ed5\u7d44\u307f\u306b\u3088\u308a\u3001\u793e\u5185LAN\u306e\u8907\u6570\u306ePC\u304c1\u3064\u306e\u30b0\u30ed\u30fc\u30d0\u30ebIP\u30a2\u30c9\u30ec\u30b9\u3092\u901a\u3058\u3066\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30d9\u30f3\u30c0\u30fc\u306b\u3088\u3063\u3066\u547c\u3073\u65b9\u304c\u7570\u306a\u308a\u3001Cisco\u3067\u306f <strong><span class=\"swl-marker mark_yellow\">PAT\uff08Port Address Translation\uff09<\/span><\/strong>\u3001Linux\u3067\u306f <strong><span class=\"swl-marker mark_yellow\">IP\u30de\u30b9\u30ab\u30ec\u30fc\u30c9<\/span><\/strong> \u3068\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">NAT\u3068\u306e\u9055\u3044<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u5e38\u306eNAT\uff08\u30b9\u30bf\u30c6\u30a3\u30c3\u30afNAT\u3084\u30c0\u30a4\u30ca\u30df\u30c3\u30afNAT\uff09\u3067\u306f <strong><span class=\"swl-marker mark_yellow\">1\u5bfe1\u306e\u5909\u63db<\/span><\/strong> \u3057\u304b\u3067\u304d\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u3001\u540c\u6642\u306b100\u53f0\u306ePC\u304c\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u306a\u3089100\u500b\u306e\u30b0\u30ed\u30fc\u30d0\u30ebIP\u30a2\u30c9\u30ec\u30b9\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u30b0\u30ed\u30fc\u30d0\u30ebIP\u306e\u67af\u6e07\u3068\u3044\u3046\u554f\u984c\u306b\u76f4\u7d50\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u65b9\u3001NAPT\u3067\u306f\u30a2\u30c9\u30ec\u30b9\u5909\u63db\u306b\u52a0\u3048\u3066\u30dd\u30fc\u30c8\u756a\u53f7\u3092\u5229\u7528\u3059\u308b\u305f\u3081\u30011\u3064\u306e\u30b0\u30ed\u30fc\u30d0\u30ebIP\u3092\u591a\u304f\u306e\u7aef\u672b\u3067\u5171\u6709\u53ef\u80fd\u3067\u3059\u3002\u305f\u3068\u3048\u3070\u9001\u4fe1\u5143IP\u304c\u540c\u3058\u3067\u3082\u3001<strong><span class=\"swl-marker mark_yellow\">\u9001\u4fe1\u5143\u30dd\u30fc\u30c8\u756a\u53f7\u304c\u7570\u306a\u308c\u3070\u5225\u3005\u306e\u901a\u4fe1\u3068\u3057\u3066\u8b58\u5225<\/span><\/strong> \u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u6570\u767e\u53f0\u306ePC\u304c1\u3064\u306e\u30b0\u30ed\u30fc\u30d0\u30ebIP\u3092\u4f7f\u3063\u3066\u540c\u6642\u306b\u901a\u4fe1\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">NAPT\u306e\u4ed5\u7d44\u307f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">NAPT\u306e\u52d5\u4f5c\u3082\u57fa\u672c\u306fNAT\u3068\u540c\u3058\u3067\u3001\u5185\u90e8\u304b\u3089\u5916\u90e8\u3078\u51fa\u308b\u969b\u306b\u306f\u9001\u4fe1\u5143IP\u30a2\u30c9\u30ec\u30b9\u3092\u5909\u63db\u3057\u3001\u623b\u3063\u3066\u304f\u308b\u3068\u304d\u306b\u306f\u5b9b\u5148IP\u30a2\u30c9\u30ec\u30b9\u3092\u5143\u306b\u623b\u3057\u307e\u3059\u3002\u305f\u3060\u3057NAPT\u3067\u306f\u3001NAT\u30c6\u30fc\u30d6\u30eb\u306b\u4ee5\u4e0b\u306e\u60c5\u5831\u3092\u767b\u9332\u3059\u308b\u70b9\u304c\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5185\u90e8\u30ed\u30fc\u30ab\u30eb\u30a2\u30c9\u30ec\u30b9 + \u30dd\u30fc\u30c8\u756a\u53f7<\/li>\n\n\n\n<li>\u5185\u90e8\u30b0\u30ed\u30fc\u30d0\u30eb\u30a2\u30c9\u30ec\u30b9 + \u30dd\u30fc\u30c8\u756a\u53f7<\/li>\n\n\n\n<li>\u5916\u90e8\u30b0\u30ed\u30fc\u30d0\u30eb\u30a2\u30c9\u30ec\u30b9 + \u30dd\u30fc\u30c8\u756a\u53f7<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u3048\u3070\u3001\u793e\u5185\u306e\u8907\u6570PC\u304c\u540c\u3058HTTP\u30b5\u30fc\u30d0\uff08TCP 80\u756a\u30dd\u30fc\u30c8\uff09\u306b\u63a5\u7d9a\u3059\u308b\u5834\u5408\u3067\u3082\u3001NAT\u30eb\u30fc\u30bf\u306f\u5404PC\u3054\u3068\u306b\u7570\u306a\u308b\u9001\u4fe1\u5143\u30dd\u30fc\u30c8\u756a\u53f7\u3092\u5272\u308a\u5f53\u3066\u3066\u8b58\u5225\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3064\u307e\u308a\u3001NAT\u30c6\u30fc\u30d6\u30eb\u306e\u691c\u7d22\u6642\u306b\u306f\u300c\u30a2\u30c9\u30ec\u30b9\uff0b\u30dd\u30fc\u30c8\u756a\u53f7\u300d\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u5224\u65ad\u3059\u308b\u305f\u3081\u3001\u540c\u3058\u30b0\u30ed\u30fc\u30d0\u30ebIP\u3092\u5171\u6709\u3057\u3066\u3044\u3066\u3082\u901a\u4fe1\u3092\u6b63\u3057\u304f\u533a\u5225\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u5bfe\u7b56\uff1a<br><br>\u30fbNAT\uff1a1\u5bfe1\u306e\u5909\u63db\uff08\u30b0\u30ed\u30fc\u30d0\u30ebIP\u304c\u591a\u6570\u5fc5\u8981\uff09<br>\u30fbNAPT\uff08PAT\uff09\uff1a1\u3064\u306e\u30b0\u30ed\u30fc\u30d0\u30ebIP\u3092\u591a\u6570\u306e\u7aef\u672b\u3067\u5171\u6709\u53ef\u80fd\uff08\u73fe\u5b9f\u7684\u306a\u65b9\u5f0f\uff09<br>\u30fbNAPT\u306e\u8b58\u5225\u65b9\u6cd5\uff1a<strong>IP\u30a2\u30c9\u30ec\u30b9\uff0b\u30dd\u30fc\u30c8\u756a\u53f7<\/strong> \u3067\u533a\u5225<br>\u30fbCisco\u3067\u306fPAT\u3001Linux\u3067\u306fIP\u30de\u30b9\u30ab\u30ec\u30fc\u30c9\u3068\u547c\u3070\u308c\u308b<br><br>\u5b9f\u52d9\u3067\u3082CCNA\u8a66\u9a13\u3067\u3082\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u63a5\u7d9a\u3067\u6700\u3082\u4e00\u822c\u7684\u306b\u5229\u7528\u3055\u308c\u308b\u306e\u306f\u3053\u306eNAPT\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u25c6\u307e\u3068\u3081\u30b9\u30e9\u30a4\u30c9<\/h2>\n\n\n\n<div 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