{"id":607,"date":"2026-05-14T04:19:02","date_gmt":"2026-05-14T04:19:02","guid":{"rendered":"https:\/\/rocketspacevpn.com\/"},"modified":"2026-05-14T06:20:11","modified_gmt":"2026-05-14T06:20:11","slug":"l2tp","status":"publish","type":"post","link":"https:\/\/rocketspacevpn.com\/ja\/post\/l2tp\/","title":{"rendered":"L2TP\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u30ec\u30a4\u30e4\u30fc2\u30c8\u30f3\u30cd\u30ea\u30f3\u30b0\u30d7\u30ed\u30c8\u30b3\u30eb\uff08Layer 2 Tunneling Protocol\uff09\u5b8c\u5168\u30ac\u30a4\u30c9"},"content":{"rendered":"

L2TP\uff08\u30ec\u30a4\u30e4\u30fc2\u30c8\u30f3\u30cd\u30ea\u30f3\u30b0\u30d7\u30ed\u30c8\u30b3\u30eb\uff09\u306f\u3001\u4eee\u60f3\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\uff08VPN\uff09\u306e\u57fa\u672c\u7684\u306a\u69cb\u6210\u8981\u7d20\u3068\u3057\u3066\u6a5f\u80fd\u3059\u308b\u30bb\u30c3\u30b7\u30e7\u30f3\u5c64\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3059\u3002RFC 2661\u3067\u6b63\u5f0f\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u3053\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u306f\u3001\u4e3b\u306bOSI\u53c2\u7167\u30e2\u30c7\u30eb\u306e\u30c7\u30fc\u30bf\u30ea\u30f3\u30af\u5c64\uff08\u30ec\u30a4\u30e4\u30fc2\uff09\u3067\u52d5\u4f5c\u3057\u307e\u3059\u304c\u3001\u73fe\u4ee3\u306eIP\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u306f\u901a\u5e38\u3001UDP\u30dd\u30fc\u30c81701\u3092\u4ecb\u3057\u3066\u4f1d\u9001\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u6280\u8853\u7684\u306a\u672c\u8cea\u306f\u3001\u30dd\u30a4\u30f3\u30c8\u30fb\u30c4\u30fc\u30fb\u30dd\u30a4\u30f3\u30c8\u30fb\u30d7\u30ed\u30c8\u30b3\u30eb\uff08PPP\uff09\u30d5\u30ec\u30fc\u30e0\u3092\u30ab\u30d7\u30bb\u30eb\u5316\u3057\u3001IP\u3001\u30d5\u30ec\u30fc\u30e0\u30ea\u30ec\u30fc\u3001ATM\u306a\u3069\u306e\u7570\u306a\u308b\u57fa\u76e4\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u4ecb\u3057\u3066\u30c8\u30f3\u30cd\u30ea\u30f3\u30b0\u3067\u304d\u308b\u70b9\u306b\u3042\u308a\u3001\u3053\u308c\u306b\u3088\u308aLAC\uff08L2TP\u30a2\u30af\u30bb\u30b9\u30b3\u30f3\u30bb\u30f3\u30c8\u30ec\u30fc\u30bf\uff09\u3068LNS\uff08L2TP\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b5\u30fc\u30d0\u30fc\uff09\u9593\u306e\u8ad6\u7406\u7684\u306a\u30ec\u30a4\u30e4\u30fc2\u63a5\u7d9a\u3092\u62e1\u5f35\u3057\u307e\u3059\u3002\u3053\u306e\u4eee\u60f3\u5316\u3055\u308c\u305f\u30c8\u30f3\u30cd\u30eb\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3067\u3001L2TP\u306f\u30ea\u30e2\u30fc\u30c8\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u5730\u7406\u7684\u306a\u5834\u6240\u306b\u95a2\u4fc2\u306a\u304f\u3001\u3042\u305f\u304b\u3082\u30ed\u30fc\u30ab\u30eb\u306e\u4f01\u696d\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u7269\u7406\u7684\u306b\u63a5\u7d9a\u3055\u308c\u3066\u3044\u308b\u304b\u306e\u3088\u3046\u306b\u898b\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30c8\u30f3\u30cd\u30eb\u306e\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\uff08\u78ba\u7acb\u3001\u7dad\u6301\u3001\u5207\u65ad\uff09\u3092\u7ba1\u7406\u3059\u308b\u305f\u3081\u306e\u5236\u5fa1\u30c1\u30e3\u30cd\u30eb\u3068\u3001\u30ab\u30d7\u30bb\u30eb\u5316\u3055\u308c\u305f\u30da\u30a4\u30ed\u30fc\u30c9\u3092\u5b9f\u969b\u306b\u9001\u4fe1\u3059\u308b\u305f\u3081\u306e\u30c7\u30fc\u30bf\u30c1\u30e3\u30cd\u30eb\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u5c02\u9580\u7684\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u89b3\u70b9\u304b\u3089\u898b\u308b\u3068\u3001L2TP\u306f\u6280\u8853\u7684\u306b\u900f\u904e\u7684\u3067\u3059\u3002\u3064\u307e\u308a\u3001\u901a\u4fe1\u306e\u305f\u3081\u306e\u30a4\u30f3\u30d5\u30e9\u306f\u63d0\u4f9b\u3057\u307e\u3059\u304c\u3001\u30c7\u30fc\u30bf\u6697\u53f7\u5316\u3084\u9001\u4fe1\u5143\u8a8d\u8a3c\u306e\u305f\u3081\u306e\u7d44\u307f\u8fbc\u307f\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u6b20\u3044\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001L2TP\u306e\u30c8\u30f3\u30cd\u30ea\u30f3\u30b0\u306e\u67d4\u8edf\u6027\u3068IPsec\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e\u5805\u7262\u306a\u6697\u53f7\u5316\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u7d44\u307f\u5408\u308f\u305b\u305fL2TP\/IPsec\u30b9\u30a4\u30fc\u30c8\u3068\u3057\u3066\u3001\u307b\u307c\u4f8b\u5916\u306a\u304f\u5c0e\u5165\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

L2TP\u306e\u4ed5\u7d44\u307f\u3068\u306f\uff1f<\/h2>\n\n\n\n
\n \n

\n L2TP\u306f\u3001\u30c7\u30fc\u30bf\u30d1\u30b1\u30c3\u30c8\u3092\u30ab\u30d7\u30bb\u30eb\u5316\u3057\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u30c7\u30d0\u30a4\u30b9\u3068\u30ea\u30e2\u30fc\u30c8VPN\u30b5\u30fc\u30d0\u30fc\u3068\u306e\u9593\u306b\u78ba\u7acb\u3055\u308c\u305f\u5c02\u7528\u306eVPN\u30c8\u30f3\u30cd\u30eb\u3092\u4ecb\u3057\u3066\u9001\u4fe1\u3059\u308b\u3053\u3068\u3067\u3001\u5b89\u5168\u306a\u901a\u4fe1\u3092\u4fc3\u9032\u3057\u307e\u3059\u3002\n <\/p>\n\n

\n
    \n
  • \n 1<\/span>\n \u958b\u59cb \/ \u958b\u59cb\u30d5\u30a7\u30fc\u30ba (Initiation):<\/strong> \n \u30e6\u30fc\u30b6\u30fc\u304cL2TP\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u4f7f\u7528\u3057\u3066VPN\u30b5\u30fc\u30d0\u30fc\u306b\u63a5\u7d9a\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u958b\u59cb\u3059\u308b\u3068\u3001\u30d7\u30ed\u30bb\u30b9\u304c\u59cb\u307e\u308a\u307e\u3059\n <\/li>\n
  • \n 2<\/span>\n \u30c8\u30f3\u30cd\u30eb\u306e\u78ba\u7acb (Tunnel Establishment):<\/strong> \n L2TP\u306f\u4eee\u60f3\u30c8\u30f3\u30cd\u30eb\u3092\u4f5c\u6210\u3057\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u7d4c\u7531\u3067\u9001\u4fe1\u3059\u308b\u305f\u3081\u306b\u30c7\u30fc\u30bf\u3092\u6e96\u5099\u3059\u308b\u914d\u4fe1\u30e1\u30ab\u30cb\u30ba\u30e0\u3068\u3057\u3066\u6a5f\u80fd\u3057\u307e\u3059\u3002\n <\/li>\n
  • \n 3<\/span>\n \u6697\u53f7\u5316\uff08IPsec \u7d71\u5408\uff09<\/strong> \n L2TP\u306b\u306f\u30cd\u30a4\u30c6\u30a3\u30d6\u306a\u6697\u53f7\u5316\u6a5f\u80fd\u304c\u6b20\u3051\u3066\u3044\u308b\u305f\u3081\u3001\u30c7\u30fc\u30bf\u306e\u6697\u53f7\u5316\u306b\u306fIPsec\u30b9\u30a4\u30fc\u30c8\u304c\u63a1\u7528\u3055\u308c\u3001\u5fc5\u8981\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3068\u672c\u4eba\u8a8d\u8a3c\u3092\u63d0\u4f9b\u3057\u307e\u3059\n <\/li>\n
  • \n 4<\/span>\n \u30bb\u30ad\u30e5\u30a2\u306a\u8ee2\u9001 (Secure Transit):<\/strong> \n \u6697\u53f7\u5316\u3055\u308c\u305f\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u306f\u3001\u78ba\u7acb\u3055\u308c\u305f\u30c8\u30f3\u30cd\u30eb\u3092\u901a\u3063\u3066\u30d1\u30d6\u30ea\u30c3\u30af\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3092\u79fb\u52d5\u3057\u3001\u5916\u90e8\u306e\u8105\u5a01\u304b\u3089\u4fdd\u8b77\u3055\u308c\u307e\u3059\n <\/li>\n
  • \n 5<\/span>\n \u5fa9\u53f7\u3068\u914d\u4fe1:<\/strong> \n \u76ee\u7684\u5730\u306b\u5230\u9054\u3059\u308b\u3068\u3001VPN\u30b5\u30fc\u30d0\u30fc\u306f\u30da\u30a4\u30ed\u30fc\u30c9\u3092\u5fa9\u53f7\u3057\u3001\u5143\u306e\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u610f\u56f3\u3057\u305f\u5185\u90e8\u30ea\u30bd\u30fc\u30b9\u3084\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306b\u8ee2\u9001\u3057\u307e\u3059\n <\/li>\n <\/ul>\n <\/div>\n\n

    \n \u6ce8:<\/strong> L2TP\u81ea\u4f53\u306b\u306f\u6697\u53f7\u5316\u6a5f\u80fd\u304c\u542b\u307e\u308c\u3066\u3044\u306a\u3044\u305f\u3081\u3001\u30a8\u30f3\u30c9\u30c4\u30fc\u30a8\u30f3\u30c9\u306e\u30c7\u30fc\u30bf\u4fdd\u8b77\u3092\u78ba\u4fdd\u3059\u308b\u306b\u306fIPsec\u306e\u4f7f\u7528\u304c\u4e0d\u53ef\u6b20\u3067\u3059\n <\/p>\n<\/section>\n\n\n\n

    \"L2TP\u306e\u4ed5\u7d44\u307f\u3068\u306f\uff1f\"
    L2TP\u306e\u4ed5\u7d44\u307f\u3068\u306f\uff1f<\/figcaption><\/figure>\n\n\n\n

    L2TP\u306e\u4e3b\u306a\u7279\u5fb4<\/h2>\n\n\n\n

    L2TP\uff08Layer 2 Tunneling Protocol\uff09\u306f\u3001\u305d\u306e\u5805\u7262\u306a\u30c8\u30f3\u30cd\u30ea\u30f3\u30b0\u6a5f\u80fd\u3067\u969b\u7acb\u3063\u3066\u304a\u308a\u3001\u30d1\u30d6\u30ea\u30c3\u30af\u30a4\u30f3\u30d5\u30e9\u3092\u4ecb\u3057\u305f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u306e\u9001\u4fe1\u3092\u5bb9\u6613\u306b\u3059\u308b\u3001\u5b89\u5b9a\u3057\u305f\u4eee\u60f3\u5316\u30c8\u30f3\u30cd\u30eb\u306e\u4f5c\u6210\u306b\u7279\u5316\u3057\u3066\u3044\u307e\u3059\u3002\u4e3b\u306a\u5f37\u307f\u306e1\u3064\u306f\u3001\u512a\u308c\u305f\u30af\u30ed\u30b9\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u4e92\u63db\u6027\u3067\u3059\u3002L2TP\/IPsec\u306f\u3001Windows\u3001macOS\u3001Linux\u3001Android\u3001iOS\u3092\u542b\u3080\u307b\u307c\u3059\u3079\u3066\u306e\u4e3b\u8981\u306a\u30aa\u30da\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u306b\u30cd\u30a4\u30c6\u30a3\u30d6\u306b\u7d71\u5408\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u6b74\u53f2\u7684\u306b\u4f01\u696d\u30ec\u30d9\u30eb\u306eVPN\u5c55\u958b\u3067\u597d\u307e\u308c\u308b\u9078\u629e\u80a2\u3068\u306a\u3063\u3066\u304d\u307e\u3057\u305f\u3002\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u306b\u52a0\u3048\u3066\u3001\u3053\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u306f\u30de\u30eb\u30c1\u30d7\u30ed\u30c8\u30b3\u30eb\u30b5\u30dd\u30fc\u30c8\u3092\u901a\u3058\u3066\u5927\u304d\u306a\u67d4\u8edf\u6027\u3092\u63d0\u4f9b\u3057\u3001\u3055\u307e\u3056\u307e\u306a\u74b0\u5883\u3067\u591a\u69d8\u306a\u7a2e\u985e\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u8ee2\u9001\u3059\u308b\u3053\u3068\u3092\u53ef\u80fd\u306b\u3057\u307e\u3059\u3002\u3055\u3089\u306b\u3001L2TP\u306f\u3001PAP\u3001CHAP\u3001MS-CHAP\u3001\u304a\u3088\u3073EAP\u306a\u3069\u306e\u65b9\u6cd5\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u5305\u62ec\u7684\u306a\u8a8d\u8a3c\u30aa\u30d7\u30b7\u30e7\u30f3\u30b9\u30a4\u30fc\u30c8\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002IPsec\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3068\u7d71\u5408\u3059\u308b\u3068\u3001\u3053\u308c\u3089\u306e\u6a5f\u80fd\u306f\u3055\u3089\u306b\u5f37\u5316\u3055\u308c\u3066\u8a3c\u660e\u66f8\u30d9\u30fc\u30b9\u306e\u8a8d\u8a3c\u304c\u542b\u307e\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u3001\u9ad8\u5ea6\u306a\u672c\u4eba\u78ba\u8a8d\u3068\u30bb\u30c3\u30b7\u30e7\u30f3\u306e\u5b8c\u5168\u6027\u304c\u4fdd\u8a3c\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n

    \n
    \n \n \n
    \n

    \n \u25b2<\/span> L2TP\/IPsec\u306e\u30e1\u30ea\u30c3\u30c8\n <\/h2>\n \n
    \n

    IPsec\u306b\u3088\u308b\u5f37\u529b\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3<\/h3>\n

    IPsec\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001L2TP\u306f\u591a\u304f\u306e\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u304a\u3044\u3066\u5b89\u5168\u3067\u3042\u308b\u3068\u898b\u306a\u3055\u308c\u308b\u3001\u5f37\u56fa\u306a\u6697\u53f7\u5316\u304a\u3088\u3073\u8a8d\u8a3c\u6a19\u6e96\u3092\u63d0\u4f9b\u3057\u307e\u3059<\/p>\n <\/div>\n\n

    \n

    \u5e45\u5e83\u304f\u30b5\u30dd\u30fc\u30c8<\/h3>\n

    \u307b\u3068\u3093\u3069\u306e\u4e3b\u8981\u306a\u30aa\u30da\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u304c\u30cd\u30a4\u30c6\u30a3\u30d6\u30b5\u30dd\u30fc\u30c8\u3092\u542b\u3093\u3067\u3044\u308b\u305f\u3081\u3001\u591a\u304f\u306e\u5834\u5408\u3001\u30e6\u30fc\u30b6\u30fc\u306f\u8ffd\u52a0\u306e\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u88fd\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u305b\u3093<\/p>\n <\/div>\n\n

    \n

    \u5b89\u5b9a\u3057\u305f\u63a5\u7d9a<\/h3>\n

    L2TP\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u8907\u96d1\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u74b0\u5883\u306b\u304a\u3044\u3066\u3001\u4fe1\u983c\u6027\u304c\u9ad8\u304f\u4e00\u8cab\u3057\u305fVPN\u63a5\u7d9a\u3092\u7dad\u6301\u3059\u308b\u3053\u3068\u3067\u77e5\u3089\u308c\u3066\u3044\u307e\u3059<\/p>\n <\/div>\n\n

    \n

    \u5bb9\u6613\u306a\u5c0e\u5165<\/h3>\n

    \u30cd\u30a4\u30c6\u30a3\u30d6\u30b5\u30dd\u30fc\u30c8\u304c\u4e00\u822c\u7684\u3067\u3042\u308b\u305f\u3081\u3001\u4f01\u696d\u3068\u500b\u4eba\u30e6\u30fc\u30b6\u30fc\u306e\u4e21\u65b9\u306b\u3068\u3063\u3066\u3001L2TP\/IPsec\u306e\u8a2d\u5b9a\u306f\u6bd4\u8f03\u7684\u5bb9\u6613\u3067\u3059<\/p>\n <\/div>\n <\/section>\n\n \n

    \n

    \n \u25bc<\/span> L2TP\/IPsec\u306e\u30c7\u30e1\u30ea\u30c3\u30c8\n <\/h2>\n\n
    \n

    \u901a\u4fe1\u901f\u5ea6\u306e\u4f4e\u4e0b<\/h3>\n

    L2TP\/IPsec\u306f\u4e8c\u91cd\u30ab\u30d7\u30bb\u30eb\u5316\uff08double encapsulation\uff09\u3092\u5229\u7528\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u304c\u5927\u5e45\u306b\u5897\u52a0\u3057\u3001\u6700\u65b0\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u6bd4\u8f03\u3057\u3066\u901f\u5ea6\u304c\u4f4e\u4e0b\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059<\/p>\n <\/div>\n\n

    \n

    \u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u306e\u5236\u9650<\/h3>\n

    \u901a\u5e38\u3001UDP\u30dd\u30fc\u30c8500\u304a\u3088\u30734500\u3092\u4f7f\u7528\u3057\u307e\u3059\u304c\u3001\u3053\u308c\u3089\u306f\u5236\u9650\u306e\u53b3\u3057\u3044\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3084ISP\uff08\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30b5\u30fc\u30d3\u30b9\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\uff09\u306b\u3088\u3063\u3066\u6a19\u7684\u306b\u3055\u308c\u3001\u30d6\u30ed\u30c3\u30af\u3055\u308c\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059<\/p>\n <\/div>\n\n

    \n

    \u7d44\u307f\u8fbc\u307f\u6697\u53f7\u5316\u306a\u3057<\/h3>\n

    L2TP\u5358\u4f53\u3067\u306f\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u6697\u53f7\u5316\u3057\u307e\u305b\u3093\u3002\u5358\u306b\u30c8\u30f3\u30cd\u30eb\u3068\u3057\u3066\u6a5f\u80fd\u3059\u308b\u3060\u3051\u3067\u3042\u308b\u305f\u3081\u3001\u5b89\u5168\u306b\u4f7f\u7528\u3059\u308b\u306b\u306fIPsec\u3068\u306e\u7d71\u5408\u304c\u4e0d\u53ef\u6b20\u3067\u3059<\/p>\n <\/div>\n\n

    \n

    \u65e7\u5f0f\u306e\u4ee3\u66ff\u6848<\/h3>\n

    WireGuard\u3084OpenVPN\u306e\u3088\u3046\u306a\u65b0\u3057\u3044\u30d7\u30ed\u30c8\u30b3\u30eb\u306f\u3001\u3088\u308a\u512a\u308c\u305f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3001\u5411\u4e0a\u3057\u305f\u52b9\u7387\u6027\u3001\u305d\u3057\u3066\u306f\u308b\u304b\u306b\u30b7\u30f3\u30d7\u30eb\u306a\u6700\u65b0\u306e\u8a2d\u5b9a\u3092\u63d0\u4f9b\u3057\u307e\u3059<\/p>\n <\/div>\n <\/section>\n \n <\/div>\n<\/div>\n\n\n\n

    L2TP\u306f\u5b89\u5168\u3067\u3059\u304b\uff1f<\/h2>\n\n\n\n

    L2TP\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306f\u3001\u30d7\u30ed\u30c8\u30b3\u30eb\u81ea\u4f53\u306b\u7d44\u307f\u8fbc\u307f\u306e\u30c7\u30fc\u30bf\u6697\u53f7\u5316\u6a5f\u80fd\u304c\u6b20\u3051\u3066\u3044\u308b\u305f\u3081\u3001\u672c\u8cea\u7684\u306b\u5b89\u5168\u3067\u306f\u306a\u3044\u3068\u3044\u3046\u70b9\u3067\u5fae\u5999\u306a\u30c8\u30d4\u30c3\u30af\u3067\u3059\u3002\u3057\u304b\u3057\u3001L2TP\u304cIPsec\u3068\u7d44\u307f\u5408\u308f\u3055\u308c\u308b\u5834\u5408\u3001\u6b63\u3057\u304f\u5b9f\u88c5\u304a\u3088\u3073\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308c\u3070\u3001\u4e00\u822c\u7684\u306b\u5b89\u5168\u306a\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u3067\u3042\u308b\u3068\u898b\u306a\u3055\u308c\u307e\u3059\u3002L2TP\/IPsec\u63a5\u7d9a\u306e\u5168\u4f53\u7684\u306a\u5b8c\u5168\u6027\u306f\u3001\u5f37\u529b\u306a\u6697\u53f7\u5316\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u4f7f\u7528\u3001\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u8a8d\u8a3c\u65b9\u6cd5\u306e\u9069\u7528\u3001\u305d\u3057\u3066\u6b63\u3057\u3044IPsec\u8a2d\u5b9a\u3068\u3068\u3082\u306b\u66f4\u65b0\u3055\u308c\u305f\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u5b9f\u88c5\u3092\u7dad\u6301\u3059\u308b\u3053\u3068\u306a\u3069\u3001\u3044\u304f\u3064\u304b\u306e\u91cd\u8981\u306a\u8981\u56e0\u306b\u5927\u304d\u304f\u4f9d\u5b58\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u5805\u7262\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u6a19\u6e96\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u3001\u696d\u754c\u3067\u306f\u5909\u5316\u304c\u8d77\u304d\u3066\u3044\u307e\u3059\u3002\u73fe\u5728\u3001\u591a\u304f\u306eVPN\u30d7\u30ed\u30d0\u30a4\u30c0\u30fc\u306f\u3001WireGuard\u3084OpenVPN\u306a\u3069\u306e\u6700\u65b0\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u512a\u5148\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u65b0\u3057\u3044\u4ee3\u66ff\u6848\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u671f\u5f85\u3059\u308b\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ec\u30d9\u30eb\u3092\u640d\u306a\u3046\u3053\u3068\u306a\u304f\u3001\u901f\u5ea6\u3068\u52b9\u7387\u304c\u5927\u5e45\u306b\u5411\u4e0a\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u3057\u3070\u3057\u3070\u597d\u307e\u308c\u307e\u3059\u3002<\/p>\n\n\n\n

    L2TP vs \u4ed6\u306eVPN\u30d7\u30ed\u30c8\u30b3\u30eb\uff1a\u6280\u8853\u7684\u6bd4\u8f03<\/h2>\n\n\n\n

    L2TP\u3092\u305d\u306e\u524d\u8eab\u3067\u3042\u308bPPTP\u3068\u6bd4\u8f03\u8a55\u4fa1\u3059\u308b\u5834\u5408\u3001\u6700\u3082\u91cd\u8981\u306a\u9055\u3044\u306f\u305d\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3068\u4fe1\u983c\u6027\u306e\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u306b\u3042\u308a\u307e\u3059\u3002\u3069\u3061\u3089\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u3082\u6b74\u53f2\u7684\u306a\u7cfb\u8b5c\u3092\u5171\u6709\u3057\u3066\u304a\u308a\u3001\u9ad8\u3044\u30c7\u30d0\u30a4\u30b9\u4e92\u63db\u6027\u3092\u8a87\u308a\u307e\u3059\u304c\u3001PPTP\u306f\u73fe\u5728\u3001\u6697\u53f7\u5316\u6a19\u6e96\u306e\u8106\u5f31\u6027\u306b\u3088\u308a\u3001\u5927\u90e8\u5206\u304c\u975e\u63a8\u5968\u3067\u3042\u308a\u4e0d\u5b89\u5168\u3067\u3042\u308b\u3068\u898b\u306a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u5bfe\u7167\u7684\u306b\u3001L2TP\/IPsec\u306f\u5f37\u529b\u306a\u6697\u53f7\u5316\u306b\u3088\u3063\u3066\u5805\u7262\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5c64\u3092\u63d0\u4f9b\u3057\u3001\u9069\u5ea6\u306a\u901f\u5ea6\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u3001PPTP\u304c\u91cd\u5927\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u3092\u62db\u304f\u53ef\u80fd\u6027\u304c\u3042\u308b\u30ec\u30ac\u30b7\u30fc\u30b7\u30b9\u30c6\u30e0\u306b\u304a\u3044\u3066\u3001\u4fe1\u983c\u3067\u304d\u308b\u4ee3\u66ff\u624b\u6bb5\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

    L2TP\u3068OpenVPN\u306e\u6bd4\u8f03\u306b\u304a\u3044\u3066\u3001\u5f8c\u8005\u306f\u305d\u306e\u67d4\u8edf\u6027\u3068\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u306e\u57fa\u76e4\u306b\u3088\u308a\u969b\u7acb\u3063\u3066\u304a\u308a\u3001\u6280\u8853\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u5185\u3067\u5e45\u5e83\u3044\u4fe1\u983c\u3092\u5f97\u3066\u3044\u307e\u3059\u3002\u3069\u3061\u3089\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u3082\u5f37\u529b\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3068\u30d0\u30e9\u30f3\u30b9\u306e\u53d6\u308c\u305f\u901f\u5ea6\u3092\u63d0\u4f9b\u3057\u307e\u3059\u304c\u3001OpenVPN\u306f\u5236\u9650\u306e\u53b3\u3057\u3044\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3092\u56de\u907f\u3059\u308b\u4e0a\u3067\u975e\u5e38\u306b\u52b9\u679c\u7684\u3067\u3042\u308b\u306e\u306b\u5bfe\u3057\u3001L2TP\u306f\u9ad8\u5ea6\u306b\u5236\u5fa1\u3055\u308c\u305f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u74b0\u5883\u3067\u306f\u82e6\u6226\u3059\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002L2TP\u306f\u4e00\u822c\u7684\u306b\u307b\u3068\u3093\u3069\u306e\u30aa\u30da\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u3067\u30cd\u30a4\u30c6\u30a3\u30d6\u306b\u8a2d\u5b9a\u3059\u308b\u306e\u304c\u3088\u308a\u7c21\u5358\u3067\u3059\u304c\u3001\u9ad8\u5ea6\u306a\u9069\u5fdc\u6027\u3068\u300c\u975e\u5e38\u306b\u5f37\u529b\u306a\u300d\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u5fc5\u8981\u3068\u3059\u308b\u30e6\u30fc\u30b6\u30fc\u306b\u3068\u3063\u3066\u306f\u3001OpenVPN\u304c\u4f9d\u7136\u3068\u3057\u3066\u512a\u5148\u3055\u308c\u308b\u6a19\u6e96\u3067\u3059\u3002<\/p>\n\n\n\n

    \u7d50\u5c40\u306e\u3068\u3053\u308d\u3001WireGuard\u306e\u53f0\u982d\u306f\u3001\u901f\u5ea6\u3068\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u306e\u5358\u7d14\u3055\u306e\u4e21\u65b9\u3092\u512a\u5148\u3059\u308b\u73fe\u4ee3\u7684\u306a\u6700\u9069\u5316\u3078\u306e\u5927\u304d\u306a\u8ee2\u63db\u3092\u610f\u5473\u3057\u3066\u3044\u307e\u3059\u3002\u8001\u673d\u5316\u3057\u305fL2TP\/IPsec\u6a19\u6e96\u3068\u6bd4\u8f03\u3057\u3066\u3001WireGuard\u306f\u8907\u96d1\u3055\u304c\u5927\u5e45\u306b\u4f4e\u3044\u8efd\u91cf\u306a\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u3092\u5229\u7528\u3057\u3066\u304a\u308a\u3001\u305d\u306e\u7d50\u679c\u3001\u30e2\u30d0\u30a4\u30eb\u30e6\u30fc\u30b6\u30fc\u306b\u3068\u3063\u3066\u975e\u5e38\u306b\u901f\u3044\u901f\u5ea6\u3068\u5411\u4e0a\u3057\u305f\u30d0\u30c3\u30c6\u30ea\u30fc\u52b9\u7387\u3092\u5b9f\u73fe\u3057\u3066\u3044\u307e\u3059\u3002L2TP\/IPsec\u306f\u5f15\u304d\u7d9a\u304d\u5b89\u5168\u3067\u4fe1\u983c\u3067\u304d\u308b\u30ec\u30ac\u30b7\u30fc\u306a\u9078\u629e\u80a2\u3067\u3042\u308a\u7d9a\u3051\u3066\u3044\u307e\u3059\u304c\u3001WireGuard\u306f\u305d\u306e\u512a\u308c\u305f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u6700\u5148\u7aef\u306e\u6697\u53f7\u5f37\u5ea6\u306b\u3088\u308a\u3001\u73fe\u4ee3\u306eVPN\u30b5\u30fc\u30d3\u30b9\u306e\u30b4\u30fc\u30eb\u30c9\u30b9\u30bf\u30f3\u30c0\u30fc\u30c9\u306b\u306a\u308a\u3064\u3064\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

    \n

    \u6280\u8853FAQ\uff1aL2TP\uff08Layer 2 Tunneling Protocol\uff09<\/h2>\n \n \n
    \n

    \n Q:<\/span>\n L2TP\/IPsec\u306e\u5177\u4f53\u7684\u306a\u30dd\u30fc\u30c8\u8981\u4ef6\u306f\u4f55\u3067\u3059\u304b\uff1f\n <\/h3>\n
    \n

    A: \u6a19\u6e96\u7684\u306aL2TP\/IPsec\u306e\u5b9f\u88c5\u3067\u306f\u30013\u3064\u306e\u7279\u5b9a\u306e\u30dd\u30fc\u30c8\u3092\u958b\u653e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002IKE\uff08\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u9375\u4ea4\u63db\uff09\u7528\u306e UDP\u30dd\u30fc\u30c8 500\u3001NAT\u30c8\u30e9\u30d0\u30fc\u30b5\u30eb\uff08NAT Traversal\uff09\u7528\u306e UDP\u30dd\u30fc\u30c8 4500\u3001\u305d\u3057\u3066L2TP\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u81ea\u4f53\u306e\u305f\u3081\u306e UDP\u30dd\u30fc\u30c8 1701 \u3067\u3059\u3002\u30c8\u30f3\u30cd\u30eb\u3092\u6b63\u5e38\u306b\u69cb\u7bc9\u3059\u308b\u306b\u306f\u3001\u3053\u308c\u3089\u306e\u30dd\u30fc\u30c8\u304c\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3092\u901a\u904e\u3067\u304d\u308b\u3088\u3046\u306b\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u304c\u6975\u3081\u3066\u91cd\u8981\u3067\u3059\u3002<\/p>\n <\/div>\n <\/div>\n\n \n

    \n

    \n Q:<\/span>\n \u4e8c\u91cd\u30ab\u30d7\u30bb\u30eb\u5316\u306f\u6700\u5927\u8ee2\u9001\u5358\u4f4d\uff08MTU\uff09\u306b\u3069\u306e\u3088\u3046\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u307e\u3059\u304b\uff1f\n <\/h3>\n
    \n

    L2TP\/IPsec\u306f\u30c7\u30fc\u30bf\u3092L2TP\u3068IPsec\u306e\u4e21\u65b9\u306e\u30d8\u30c3\u30c0\u30fc\u3067\u5305\u3080\u305f\u3081\u3001\u5404\u30d1\u30b1\u30c3\u30c8\u306b\u5927\u304d\u306a\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u304c\u52a0\u308f\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30d1\u30b1\u30c3\u30c8\u306e\u65ad\u7247\u5316\u3092\u9632\u3050\u305f\u3081\u306bMTU\u30b5\u30a4\u30ba\u3092\uff08\u901a\u5e38\u306f1400\u307e\u305f\u306f1280\u30d0\u30a4\u30c8\u306b\uff09\u7e2e\u5c0f\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u304c\u591a\u304f\u3001\u305d\u3046\u3057\u306a\u3044\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u4f4e\u4e0b\u3084\u63a5\u7d9a\u306e\u5207\u65ad\u3092\u62db\u304f\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n <\/div>\n <\/div>\n\n \n

    \n

    \n Q:<\/span>\n L2TP\u30a2\u30af\u30bb\u30b9\u30b3\u30f3\u30bb\u30f3\u30c8\u30ec\u30fc\u30bf\uff08LAC\uff09\u3068L2TP\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b5\u30fc\u30d0\uff08LNS\uff09\u306e\u5f79\u5272\u306f\u4f55\u3067\u3059\u304b\uff1f\n <\/h3>\n
    \n

    LAC\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304b\u3089\u306e\u547c\u3073\u51fa\u3057\u3084\u63a5\u7d9a\u3092\u7269\u7406\u7684\u306b\u7d42\u7aef\u3057\u3001\u305d\u306e\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092LNS\u3078\u30c8\u30f3\u30cd\u30ea\u30f3\u30b0\u3059\u308b\u30c7\u30d0\u30a4\u30b9\u3067\u3059\u3002LNS\u306fL2TP\u30bb\u30c3\u30b7\u30e7\u30f3\u306e\u8ad6\u7406\u7684\u306a\u7d42\u7aef\u70b9\u3067\u3042\u308a\u3001\u3053\u3053\u3067PPP\u30d5\u30ec\u30fc\u30e0\u304c\u975e\u30ab\u30d7\u30bb\u30eb\u5316\uff08\u30c7\u30ab\u30d7\u30bb\u30eb\u5316\uff09\u3055\u308c\u3001\u5185\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3078\u306e\u30a2\u30af\u30bb\u30b9\u306e\u305f\u3081\u306b\u51e6\u7406\u3055\u308c\u307e\u3059\u3002<\/p>\n <\/div>\n <\/div>\n\n \n

    \n

    \n Q:<\/span>\n \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u76e3\u67fb\u306b\u304a\u3044\u3066\u3001L2TP\u304c\u300c\u900f\u904e\u7684\uff08transparent\uff09\u300d\u306a\u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u898b\u306a\u3055\u308c\u308b\u306e\u306f\u306a\u305c\u3067\u3059\u304b\uff1f\n <\/h3>\n
    \n

    \u6280\u8853\u76e3\u67fb\u306b\u304a\u3044\u3066\u3001L2TP\u304c\u300c\u900f\u904e\u7684\uff08transparent\uff09\u300d\u3068\u30e9\u30d9\u30eb\u4ed8\u3051\u3055\u308c\u308b\u306e\u306f\u3001\u30da\u30a4\u30ed\u30fc\u30c9\u3092\u4fee\u6b63\u3057\u305f\u308a\u4fdd\u8b77\u3057\u305f\u308a\u3059\u308b\u3053\u3068\u306a\u304f\u3001\u30c8\u30f3\ub124\ub9c1\uff08\u30c8\u30f3\u30cd\u30ea\u30f3\u30b0\uff09\u69cb\u9020\u306e\u307f\u3092\u63d0\u4f9b\u3059\u308b\u305f\u3081\u3067\u3059\u3002\u3053\u308c\u306f\u53b3\u5bc6\u306b\u30bb\u30c3\u30b7\u30e7\u30f3\u5c64\u306e\u79fb\u52d5\u306e\u307f\u3092\u51e6\u7406\u3057\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u5c02\u9580\u5bb6\u306f\u3001L2TP\u306b\u6b20\u3051\u3066\u3044\u308b\u6697\u53f7\u5316\u5c64\u3092\u63d0\u4f9b\u3059\u308b\u305f\u3081\u306bIPsec\u306e\u4f7f\u7528\u3092\u7fa9\u52d9\u4ed8\u3051\u3066\u3044\u307e\u3059\u3002<\/p>\n <\/div>\n <\/div>\n\n \n

    \n

    \n Q:<\/span>\n L2TP\u306fIP\u4ee5\u5916\u306e\u30de\u30eb\u30c1\u30d7\u30ed\u30c8\u30b3\u30eb\u30fb\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u304b\uff1f\n <\/h3>\n
    \n

    \u306f\u3044\u3001\u305d\u306e\u901a\u308a\u3067\u3059\u3002L2TP\u306e\u969b\u7acb\u3063\u305f\u6280\u8853\u7684\u5229\u70b9\u306e\u4e00\u3064\u306f\u3001IP\u3060\u3051\u3067\u306a\u304f\u69d8\u3005\u306a\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u30c8\u30f3\u30cd\u30ea\u30f3\u30b0\u3067\u304d\u308b\u80fd\u529b\u306b\u3042\u308a\u307e\u3059\u3002L2TP\u306fPPP\u30d5\u30ec\u30fc\u30e0\u3092\u30ab\u30d7\u30bb\u30eb\u5316\u3059\u308b\u305f\u3081\u3001PPP\u304c\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u3042\u3089\u3086\u308b\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u8ee2\u9001\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u30ec\u30ac\u30b7\u30fc\u74b0\u5883\u3084\u7279\u6b8a\u306a\u4f01\u696d\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u74b0\u5883\u306b\u304a\u3044\u3066\u9ad8\u3044\u67d4\u8edf\u6027\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/p>\n <\/div>\n <\/div>\n<\/section>","protected":false},"excerpt":{"rendered":"

    L2TP\uff08Layer 2 Tunneling Protocol\uff09\u306f\u3001\u4eee\u60f3\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\uff08VPN\uff09\u306e\u57fa\u672c\u7684\u306a\u69cb\u6210\u8981\u7d20\u3068\u306a\u308b\u30bb\u30c3\u30b7\u30e7\u30f3\u5c64\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3059\u3002RFC 2661\u3067\u6b63\u5f0f\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u304a\u308a\u3001\u4e3b\u306bOSI\u30e2\u30c7\u30eb\u306e\u30c7\u30fc\u30bf\u30ea\u30f3\u30af\u5c64\uff08\u30ec\u30a4\u30e42\uff09\u3067\u52d5\u4f5c\u3057\u307e\u3059\u304c\u3001\u73fe\u4ee3\u306eIP\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u306fUDP\u30dd\u30fc\u30c81701\u3092\u4ecb\u3057\u3066\u904b\u3070\u308c\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002\u6280\u8853\u7684\u306a\u672c\u8cea\u306f\u3001\u30dd\u30a4\u30f3\u30c8\u30c4\u30fc\u30dd\u30a4\u30f3\u30c8\u30d7\u30ed\u30c8\u30b3\u30eb\uff08PPP\uff09\u30d5\u30ec\u30fc\u30e0\u3092\u30ab\u30d7\u30bb\u30eb\u5316\u3057\u3001IP\u3001\u30d5\u30ec\u30fc\u30e0\u30ea\u30ec\u30fc\u3001ATM\u306a\u3069\u306e\u591a\u69d8\u3067\u6f5c\u5728\u7684\u306b\u4e92\u63db\u6027\u306e\u306a\u3044\u57fa\u76e4\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u8d8a\u3048\u3066\u30c8\u30f3\u30cd\u30ea\u30f3\u30b0\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3001LAC\uff08L2TP\u30a2\u30af\u30bb\u30b9\u30b3\u30f3\u30bb\u30f3\u30c8\u30ec\u30fc\u30bf\uff09\u3068LNS\uff08L2TP\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b5\u30fc\u30d0\uff09\u9593\u306e\u8ad6\u7406\u7684\u306a\u30ec\u30a4\u30e42\u63a5\u7d9a\u3092\u62e1\u5f35\u3059\u308b\u3053\u3068\u306b\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u4eee\u60f3\u5316\u3055\u308c\u305f\u30c8\u30f3\u30cd\u30eb\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3067\u3001L2TP\u306f\u30ea\u30e2\u30fc\u30c8\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u5730\u7406\u7684\u306a\u5834\u6240\u306b\u95a2\u4fc2\u306a\u304f\u3001\u7269\u7406\u7684\u306b\u30ed\u30fc\u30ab\u30eb\u306e\u4f01\u696d\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u63a5\u7d9a\u3057\u3066\u3044\u308b\u304b\u306e\u3088\u3046\u306b\u898b\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002L2TP\u306f\u3001\u30c8\u30f3\u30cd\u30eb\u306e\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\uff08\u78ba\u7acb\u3001\u7dad\u6301\u3001\u5207\u65ad\uff09\u3092\u7ba1\u7406\u3059\u308b\u305f\u3081\u306e\u5236\u5fa1\u30c1\u30e3\u30cd\u30eb\u3068\u3001\u30ab\u30d7\u30bb\u30eb\u5316\u3055\u308c\u305f\u30da\u30a4\u30ed\u30fc\u30c9\u306e\u5b9f\u969b\u306e\u8ee2\u9001\u306e\u305f\u3081\u306e\u30c7\u30fc\u30bf\u30c1\u30e3\u30cd\u30eb\u3092\u5229\u7528\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u7d14\u7c8b\u306b\u5c02\u9580\u7684\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u89b3\u70b9\u304b\u3089\u898b\u308b\u3068\u3001L2TP\u306f\u6280\u8853\u7684\u306b\u900f\u904e\u7684\u3067\u3042\u308a\u3001\u79fb\u52d5\u306e\u305f\u3081\u306e\u30a4\u30f3\u30d5\u30e9\u30b9\u30c8\u30e9\u30af\u30c1\u30e3\u3092\u63d0\u4f9b\u3057\u307e\u3059\u304c\u3001\u30c7\u30fc\u30bf\u6697\u53f7\u5316\u3084\u767a\u4fe1\u5143\u8a8d\u8a3c\u306e\u305f\u3081\u306e\u7d44\u307f\u8fbc\u307f\u30e1\u30ab\u30cb\u30ba\u30e0\u304c\u6b20\u3051\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u7d50\u679c\u3001\u307b\u307c\u4f8b\u5916\u306a\u304fIPsec\u3068\u7d44\u307f\u5408\u308f\u305b\u3066L2TP\/IPsec\u30b9\u30a4\u30fc\u30c8\u3092\u5f62\u6210\u3057\u3001L2TP\u306e\u30c8\u30f3\u30cd\u30ea\u30f3\u30b0\u306e\u67d4\u8edf\u6027\u3068\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30d7\u30ed\u30c8\u30b3\u30eb\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e\u5f37\u529b\u306a\u6697\u53f7\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u6d3b\u7528\u3057\u307e\u3059\u3002\n\n**L2TP\u306e\u4ed5\u7d44\u307f\u306f\uff1f** \nL2TP\u306f\u3001\u30c7\u30fc\u30bf\u30d1\u30b1\u30c3\u30c8\u3092\u30ab\u30d7\u30bb\u30eb\u5316\u3057\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u30c7\u30d0\u30a4\u30b9\u3068\u30ea\u30e2\u30fc\u30c8VPN\u30b5\u30fc\u30d0\u30fc\u9593\u306b\u78ba\u7acb\u3055\u308c\u305f\u5c02\u7528VPN\u30c8\u30f3\u30cd\u30eb\u3092\u4ecb\u3057\u3066\u9001\u4fe1\u3059\u308b\u3053\u3068\u3067\u3001\u5b89\u5168\u306a\u901a\u4fe1\u3092\u4fc3\u9032\u3057\u307e\u3059\u3002\n\n1. **\u958b\u59cb**: \u30e6\u30fc\u30b6\u30fc\u304cL2TP\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u4f7f\u7528\u3057\u3066VPN\u30b5\u30fc\u30d0\u30fc\u306b\u63a5\u7d9a\u8981\u6c42\u3092\u958b\u59cb\u3059\u308b\u3068\u3001\u30d7\u30ed\u30bb\u30b9\u304c\u59cb\u307e\u308a\u307e\u3059\u3002\n2. **\u30c8\u30f3\u30cd\u30eb\u306e\u78ba\u7acb**: L2TP\u306f\u4eee\u60f3\u30c8\u30f3\u30cd\u30eb\u3092\u4f5c\u6210\u3057\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3092\u4ecb\u3057\u305f\u30c7\u30fc\u30bf\u9001\u4fe1\u306e\u6e96\u5099\u3092\u884c\u3046\u914d\u4fe1\u30e1\u30ab\u30cb\u30ba\u30e0\u3068\u3057\u3066\u6a5f\u80fd\u3057\u307e\u3059\u3002\n3. **\u6697\u53f7\u5316\uff08IPsec\u7d71\u5408\uff09**: L2TP\u306b\u306f\u30cd\u30a4\u30c6\u30a3\u30d6\u6697\u53f7\u5316\u304c\u306a\u3044\u305f\u3081\u3001IPsec\u30b9\u30a4\u30fc\u30c8\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30fc\u30bf\u3092\u6697\u53f7\u5316\u3057\u3001\u5fc5\u8981\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3068ID\u8a8d\u8a3c\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\n4. **\u5b89\u5168\u306a\u8ee2\u9001**: \u6697\u53f7\u5316\u3055\u308c\u305f\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u306f\u3001\u78ba\u7acb\u3055\u308c\u305f\u30c8\u30f3\u30cd\u30eb\u3092\u901a\u3063\u3066\u516c\u8846\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3092\u6a2a\u65ad\u3057\u3001\u5916\u90e8\u306e\u8105\u5a01\u304b\u3089\u4fdd\u8b77\u3055\u308c\u307e\u3059\u3002\n5. **\u5fa9\u53f7\u5316\u3068\u914d\u4fe1**: \u5b9b\u5148\u306b\u5230\u7740\u3059\u308b\u3068\u3001VPN\u30b5\u30fc\u30d0\u30fc\u306f\u30da\u30a4\u30ed\u30fc\u30c9\u3092\u5fa9\u53f7\u5316\u3057\u3001\u5143\u306e\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u76ee\u7684\u306e\u5185\u90e8\u30ea\u30bd\u30fc\u30b9\u307e\u305f\u306fWeb\u30b5\u30a4\u30c8\u306b\u8ee2\u9001\u3057\u307e\u3059\u3002\n\n\u6ce8\uff1aL2TP\u81ea\u4f53\u306b\u306f\u6697\u53f7\u5316\u304c\u542b\u307e\u308c\u3066\u3044\u306a\u3044\u305f\u3081\u3001\u30a8\u30f3\u30c9\u30c4\u30fc\u30a8\u30f3\u30c9\u306e\u30c7\u30fc\u30bf\u4fdd\u8b77\u3092\u78ba\u4fdd\u3059\u308b\u306b\u306fIPsec\u306e\u4f7f\u7528\u304c\u4e0d\u53ef\u6b20\u3067\u3059\u3002\n\n**L2TP\u306e\u4e3b\u306a\u6a5f\u80fd** 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