TTL\uff08Time to Live\uff09\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u6280\u8853\u306b\u304a\u3051\u308b\u57fa\u672c\u7684\u306a\u6982\u5ff5\u3067\u3042\u308a\u3001\u30c7\u30fc\u30bf\u30fb\u30d5\u30ed\u30fc\u306e\u5236\u5fa1\u3068\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30fb\u30ea\u30bd\u30fc\u30b9\u306e\u6700\u9069\u5316\u306b\u304a\u3044\u3066\u6c7a\u5b9a\u7684\u306a\u5f79\u5272\u3092\u679c\u305f\u3059\u3002\u305d\u306e\u4e2d\u6838\u3068\u306a\u308b TTL \u306f\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u30fb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u304a\u3051\u308b\u30c7\u30fc\u30bf\u30fb\u30d1\u30b1\u30c3\u30c8\u3084\u60c5\u5831\u306e\u5bff\u547d\u3092\u5b9a\u7fa9\u3059\u308b\u3002\u3053\u306e\u5bff\u547d\u306f\u3001\u4e00\u5b9a\u671f\u9593\u3001\u307e\u305f\u306f\u30d1\u30b1\u30c3\u30c8\u304c\u7834\u68c4\u307e\u305f\u306f\u66f4\u65b0\u3055\u308c\u308b\u307e\u3067\u306b\u901a\u904e\u3059\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30ce\u30fc\u30c9\uff08\u30db\u30c3\u30d7\uff09\u306e\u6570\u306b\u3088\u3063\u3066\u6c7a\u5b9a\u3055\u308c\u307e\u3059\u3002<\/p>\n
TTL\u306f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u901a\u4fe1\u306e\u69d8\u3005\u306a\u5206\u91ce\u3067\u4f7f\u7528\u3055\u308c\u3066\u304a\u308a\u3001\u4e3b\u306a\u7528\u9014\u306f\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30d7\u30ed\u30c8\u30b3\u30eb\uff08IP\uff09\u3068\u30c9\u30e1\u30a4\u30f3\u30cd\u30fc\u30e0\u30b7\u30b9\u30c6\u30e0\uff08DNS\uff09\u3067\u3042\u308b\u3002<\/p>\n
\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u6587\u8108\u3067\u306f\u3001TTL\u306fIP\u30d1\u30b1\u30c3\u30c8\u306e\u30d8\u30c3\u30c0\u30fc\u5185\u306e8\u30d3\u30c3\u30c8\u30d5\u30a3\u30fc\u30eb\u30c9\u3067\u3042\u308b\u3002IPv4\u3067\u306f\u3001\u3053\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306f20\u30d0\u30a4\u30c8\u30d8\u30c3\u30c0\u306e9\u756a\u76ee\u306e\u4f4d\u7f6e\u306b\u3042\u308a\u3001IPv6\u3067\u306f40\u30d0\u30a4\u30c8\u30d8\u30c3\u30c0\u306e8\u756a\u76ee\u306e\u30aa\u30af\u30c6\u30c3\u30c8\u3092\u8868\u3059\u3002TTL\u306e\u6700\u5927\u5024\u306f255\u3067\u3042\u308a\u3001\u3053\u308c\u306f1\u30aa\u30af\u30c6\u30c3\u30c8\u3067\u8868\u73fe\u53ef\u80fd\u306a\u6700\u5927\u5024\u3067\u3042\u308b\u3002<\/p>\n
\u4ed5\u7d44\u307f\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3060\uff1a<\/p>\n
1. \u9001\u4fe1\u8005\u306f\u30c7\u30fc\u30bf\u30d1\u30b1\u30c3\u30c8\u306b\u521d\u671fTTL\u5024\u3092\u8a2d\u5b9a\u3059\u308b\u3002
\n2.\u76ee\u7684\u5730\u306b\u5411\u304b\u3046\u9014\u4e2d\u306e\u5404\u30eb\u30fc\u30bf\u30fc\u306f\u3001\u3053\u306e\u5024\u3092\u5c11\u306a\u304f\u3068\u30821\u6e1b\u3089\u3059\u3002
\n3. \u30d1\u30b1\u30c3\u30c8\u304c\u5b9b\u5148\u306b\u5230\u9054\u3059\u308b\u524d\u306bTTL\u5024\u304c0\u306b\u306a\u3063\u305f\u5834\u5408\u3001\u305d\u306e\u30d1\u30b1\u30c3\u30c8\u306f\u7834\u68c4\u3055\u308c\u308b\u3002
\n4.\u30d1\u30b1\u30c3\u30c8\u3092\u7834\u68c4\u3057\u305f\u30eb\u30fc\u30bf\u30fc\u306f\u3001ICMP\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\uff08Time Exceeded\uff09\u3092\u9001\u4fe1\u8005\u306b\u9001\u308a\u8fd4\u3059\u3002<\/p>\n
\u3053\u306e\u65b9\u6cd5\u306f\u3001\u30c7\u30fc\u30bf\u30d1\u30b1\u30c3\u30c8\u304c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u3092\u7121\u9650\u306b\u5faa\u74b0\u3057\u3001\u30ea\u30bd\u30fc\u30b9\u3092\u6d6a\u8cbb\u3059\u308b\u306e\u3092\u9632\u3050\u3002TTL\u306e\u63a8\u5968\u958b\u59cb\u5024\u306f64\u3060\u304c\u3001\u3053\u308c\u306f\u30aa\u30da\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u30fb\u30b7\u30b9\u30c6\u30e0\u3084\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u3088\u3063\u3066\u7570\u306a\u308b\u3002<\/p>\n
DNS\u306e\u6587\u8108\u3067\u306f\u3001TTL\u5024\u306f\u3001DNS\u30a8\u30f3\u30c8\u30ea\u304c\u6642\u4ee3\u9045\u308c\u3068\u307f\u306a\u3055\u308c\u3001\u66f4\u65b0\u304c\u5fc5\u8981\u306b\u306a\u308b\u307e\u3067\u306b\u3001\u3069\u308c\u3060\u3051\u306e\u671f\u9593\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u4fdd\u5b58\u3055\u308c\u308b\u304b\u3092\u6c7a\u5b9a\u3059\u308b\u3002\u3053\u308c\u306fDNS\u30af\u30a8\u30ea\u306e\u52b9\u7387\u3068\u9069\u6642\u6027\u306b\u3068\u3063\u3066\u7279\u306b\u91cd\u8981\u3067\u3042\u308b\u3002<\/p>\n
DNS\u30b5\u30fc\u30d0\u30fc\u306f\u30af\u30a8\u30ea\u306b\u5fdc\u7b54\u3059\u308b\u3068\u304d\u3001\u305d\u306e\u7d50\u679c\u306bTTL\u5024\u3092\u4ed8\u52a0\u3059\u308b\u3002\u3053\u306e\u5024\u306f\u3001\u5fdc\u7b54\u304c\u6709\u52b9\u3068\u307f\u306a\u3055\u308c\u308b\u671f\u9593\u3092\u793a\u3059\u3002\u30ad\u30e3\u30c3\u30b7\u30e5DNS\u30b5\u30fc\u30d0\u30fc\u3068\u30ed\u30fc\u30ab\u30ebDNS\u30ea\u30be\u30eb\u30d0\u30fc\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u671f\u9593\u3053\u306e\u60c5\u5831\u3092\u4fdd\u5b58\u3057\u307e\u3059\u3002\u3053\u306e\u9593\u306f\u3001\u6a29\u5a01DNS\u30b5\u30fc\u30d0\u30fc\u306b\u518d\u5ea6\u554f\u3044\u5408\u308f\u305b\u308b\u3053\u3068\u306a\u304f\u3001\u4fdd\u5b58\u3055\u308c\u305f\u56de\u7b54\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
TTL\u306e\u4f7f\u7528\u306b\u306f\u3044\u304f\u3064\u304b\u306e\u91cd\u8981\u306a\u5229\u70b9\u3068\u5fdc\u7528\u304c\u3042\u308b\uff1a<\/p>\n
1. \u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u30fb\u30eb\u30fc\u30d7\u306e\u9632\u6b62\uff1aTTL\u306f\u3001\u30c7\u30fc\u30bf\u30fb\u30d1\u30b1\u30c3\u30c8\u304c\u30a8\u30f3\u30c9\u30ec\u30b9\u30fb\u30eb\u30fc\u30d7\u306b\u9665\u308a\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u904e\u8ca0\u8377\u304c\u304b\u304b\u308b\u306e\u3092\u9632\u3050\u3002
\n2.\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6700\u9069\u5316\uff1a\u30d1\u30b1\u30c3\u30c8\u306e\u5bff\u547d\u3092\u5236\u9650\u3059\u308b\u3053\u3068\u3067\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8ca0\u8377\u304c\u8efd\u6e1b\u3055\u308c\u308b\u3002
\n3.\u30ad\u30e3\u30c3\u30b7\u30e5\u5236\u5fa1\uff1aDNS\u306e\u6587\u8108\u3067\u306f\u3001TTL\u306f\u60c5\u5831\u306e\u52b9\u7387\u7684\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u53ef\u80fd\u306b\u3057\u3001\u5fdc\u7b54\u6642\u9593\u3092\u6539\u5584\u3057\u3001DNS\u30b5\u30fc\u30d0\u30fc\u306e\u8ca0\u8377\u3092\u8efd\u6e1b\u3059\u308b\u3002
\n4. \u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b7\u30f3\u30b0\u3068\u9ad8\u53ef\u7528\u6027\uff1aTTL\u5024\u3092\u8abf\u6574\u3059\u308b\u3053\u3068\u3067\u3001\u7ba1\u7406\u8005\u306f\u7570\u306a\u308b\u30b5\u30fc\u30d0\u30fc\u3078\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u5206\u6563\u3092\u5236\u5fa1\u3067\u304d\u308b\u3002
\n5 \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\uff1aTTL\u306f\u3001\u8aa4\u9001\u4fe1\u3084\u60aa\u610f\u306e\u3042\u308b\u30d1\u30b1\u30c3\u30c8\u306e\u62e1\u6563\u3092\u5236\u9650\u3059\u308b\u306e\u306b\u5f79\u7acb\u3064\u3002<\/p>\n
\u3055\u3089\u306bTTL\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30ea\u30bd\u30fc\u30b9\u306e\u7ba1\u7406\u306b\u304a\u3044\u3066\u3001\u53e4\u3044\u30c7\u30fc\u30bf\u3092\u8fc5\u901f\u306b\u524a\u9664\u3057\u3001\u6700\u65b0\u306e\u60c5\u5831\u306e\u307f\u3092\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u6d41\u901a\u3055\u305b\u308b\u3068\u3044\u3046\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3059\u3002\u3053\u308c\u306f\u7279\u306b\u3001\u30c7\u30fc\u30bf\u306e\u52b9\u7387\u6027\u3068\u9069\u6642\u6027\u304c\u4e8b\u696d\u904b\u55b6\u306b\u4e0d\u53ef\u6b20\u306a\u5927\u4f01\u696d\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u95a2\u9023\u3057\u307e\u3059\u3002<\/p>\n
ping\u300d\u3084\u300ctraceroute\u300d\u306a\u3069\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a3a\u65ad\u30c4\u30fc\u30eb\u306f\u3001TTL\u3092\u4f7f\u3063\u3066\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7d4c\u8def\u306e\u60c5\u5831\u3092\u53ce\u96c6\u3059\u308b\uff1a<\/p>\n
- Ping\uff1aTTL\u3092\u4f7f\u7528\u3057\u3066\u5b9b\u5148\u306e\u5230\u9054\u53ef\u80fd\u6027\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u30e9\u30a6\u30f3\u30c9\u30fb\u30c8\u30ea\u30c3\u30d7\u30fb\u30bf\u30a4\u30e0\uff08RTT\uff09\u3092\u6e2c\u5b9a\u3059\u308b\u3002
\n- \u30c8\u30ec\u30fc\u30b9\u30eb\u30fc\u30c8\uff1a\u6bb5\u968e\u7684\u306b\u5897\u52a0\u3059\u308bTTL\u5024\u3092\u4f7f\u7528\u3057\u3066\u3001\u30bf\u30fc\u30b2\u30c3\u30c8\u307e\u3067\u306e\u30d1\u30b9\u3092\u30de\u30c3\u30d4\u30f3\u30b0\u3057\u3001\u5404\u30db\u30c3\u30d7\u3067\u306e\u9045\u5ef6\u3092\u6e2c\u5b9a\u3059\u308b\u3002<\/p>\n
\u3053\u308c\u3089\u306e\u30c4\u30fc\u30eb\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u3084\u554f\u984c\u306e\u3042\u308b\u30ce\u30fc\u30c9\u3092\u7279\u5b9a\u3059\u308b\u306e\u306b\u5f79\u7acb\u3064\u305f\u3081\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7ba1\u7406\u306b\u306f\u4e0d\u53ef\u6b20\u3067\u3059\u3002TTL\u5024\u3092\u5206\u6790\u3059\u308b\u3053\u3068\u3067\u3001\u7ba1\u7406\u8005\u306f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30fb\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u76e3\u8996\u3057\u3001\u7684\u3092\u7d5e\u3063\u305f\u6700\u9069\u5316\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
IP\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u30b7\u30ca\u30ea\u30aa\u3067\u306f\u3001TTL\u306f\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u30d1\u30b1\u30c3\u30c8\u306e\u7bc4\u56f2\u3092\u5236\u5fa1\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u3002TTL\u5024\u304c\u9ad8\u3044\u307b\u3069\u30d1\u30b1\u30c3\u30c8\u3092\u3088\u308a\u9060\u304f\u307e\u3067\u62e1\u6563\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u4f4e\u3044\u307b\u3069\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3078\u306e\u914d\u4fe1\u304c\u5236\u9650\u3055\u308c\u308b\u3002\u3053\u308c\u306f\u3001\u30d3\u30c7\u30aa\u4f1a\u8b70\u3084\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u306a\u3069\u3001\u30c7\u30fc\u30bf\u4f1d\u9001\u306e\u52b9\u7387\u304c\u91cd\u8981\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u7279\u306b\u6709\u52b9\u3067\u3059\u3002<\/p>\n
\u30de\u30eb\u30c1\u30ad\u30e3\u30b9\u30c8\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306eTTL\u5024\u3092\u6b63\u3057\u304f\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u5e2f\u57df\u5e45\u306e\u4f7f\u7528\u3092\u6700\u9069\u5316\u3057\u3001\u4e0d\u5fc5\u8981\u306b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u8ca0\u8377\u3092\u304b\u3051\u308b\u3053\u3068\u306a\u304f\u3001\u610f\u56f3\u3057\u305f\u53d7\u4fe1\u8005\u306b\u306e\u307f\u30c7\u30fc\u30bf\u304c\u5c4a\u304f\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n
CDN\u306fTTL\u5024\u3092\u4f7f\u3063\u3066\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u30a8\u30c3\u30b8\u30b5\u30fc\u30d0\u30fc\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u3059\u308b\u671f\u9593\u3092\u5236\u5fa1\u3059\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u6700\u65b0\u306e\u72b6\u614b\u306b\u4fdd\u3064\u3053\u3068\u3068\u3001\u30aa\u30ea\u30b8\u30f3\u30b5\u30fc\u30d0\u30fc\u306e\u8ca0\u8377\u3092\u8efd\u6e1b\u3059\u308b\u3053\u3068\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u3068\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002TTL\u5024\u3092\u6700\u9069\u5316\u3059\u308b\u3053\u3068\u3067\u3001CDN\u306f\u30a8\u30f3\u30c9\u30e6\u30fc\u30b6\u30fc\u306e\u30ed\u30fc\u30c9\u6642\u9593\u3092\u77ed\u7e2e\u3057\u3001\u63d0\u4f9b\u3059\u308b\u30b5\u30fc\u30d3\u30b9\u306e\u8cea\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n
TTL\u8a2d\u5b9a\u304c\u6700\u9069\u5316\u3055\u308c\u305fCDN\u3092\u3046\u307e\u304f\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u7279\u306b\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u306e\u591a\u3044\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u3084\u4e16\u754c\u4e2d\u304b\u3089\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30e6\u30fc\u30b6\u30fc\u30a8\u30af\u30b9\u30da\u30ea\u30a8\u30f3\u30b9\u3092\u5927\u5e45\u306b\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n
\u9069\u5207\u306aTTL\u5024\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u306f\u3001\u9069\u6642\u6027\u3068\u52b9\u7387\u6027\u306e\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5\u3067\u3042\u308b\uff1a<\/p>\n
- \u77ed\u3044TTL\u5024\uff08300\u79d2\u30845\u5206\u306a\u3069\uff09\uff1a
\n - \u8fc5\u901f\u306a\u5909\u66f4\u3068\u66f4\u65b0\u3092\u53ef\u80fd\u306b\u3059\u308b
\n - DNS\u30af\u30a8\u30ea\u6570\u3068\u30b5\u30fc\u30d0\u30fc\u8ca0\u8377\u306e\u5897\u52a0
\n - \u983b\u7e41\u306b\u5909\u66f4\u3055\u308c\u308b\u30b3\u30f3\u30c6\u30f3\u30c4\u3084\u30b5\u30fc\u30d3\u30b9\u306b\u4fbf\u5229<\/p>\n
- \u9577\u3044TTL\u5024\uff0886400\u79d2\u308424\u6642\u9593\u306a\u3069\uff09\uff1a
\n - \u30b5\u30fc\u30d0\u30fc\u306e\u8ca0\u8377\u3092\u8efd\u6e1b\u3057\u3001\u5fdc\u7b54\u6642\u9593\u3092\u6539\u5584
\n - \u5909\u5316\u306e\u5e83\u304c\u308a\u3092\u9045\u3089\u305b\u308b
\n - \u5b89\u5b9a\u3057\u305f\u3001\u5909\u5316\u306e\u5c11\u306a\u3044\u30b3\u30f3\u30c6\u30f3\u30c4\u306b\u9069\u3057\u3066\u3044\u308b<\/p>\n
\u307b\u3068\u3093\u3069\u306e\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u3084\u30b5\u30fc\u30d3\u30b9\u3067\u306f\u30011\u6642\u9593\u304b\u308924\u6642\u9593\u306eTTL\u5024\u304c\u9069\u5207\u3067\u3059\u3002\u30af\u30ea\u30c6\u30a3\u30ab\u30eb\u306a\u30b5\u30fc\u30d3\u30b9\u3084\u983b\u7e41\u306a\u5909\u66f4\u304c\u5fc5\u8981\u306a\u30b5\u30fc\u30d3\u30b9\u3067\u306f\u30015\u5206\u304b\u308930\u5206\u7a0b\u5ea6\u306e\u77ed\u3044TTL\u5024\u304c\u9069\u5207\u306a\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002TTL\u5024\u306e\u6700\u9069\u5316\u306f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u9069\u6642\u6027\u306e\u6700\u9069\u306a\u30d0\u30e9\u30f3\u30b9\u3092\u78ba\u4fdd\u3059\u308b\u305f\u3081\u306b\u3001\u5b9a\u671f\u7684\u306b\u898b\u76f4\u3057\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u7279\u5b9a\u306e\u8981\u4ef6\u306b\u9069\u5408\u3055\u305b\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u3055\u3089\u306b\u3001\u9ad8\u5ea6\u306a\u76e3\u8996\u30c4\u30fc\u30eb\u3092\u4f7f\u7528\u3057\u3066\u3001TTL\u8a2d\u5b9a\u306e\u52b9\u679c\u3092\u76e3\u8996\u3057\u3001\u30c7\u30fc\u30bf\u306b\u57fa\u3065\u3044\u3066\u8abf\u6574\u306e\u5224\u65ad\u3092\u4e0b\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u9577\u671f\u7684\u306b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3\u3068\u4fe1\u983c\u6027\u3092\u78ba\u4fdd\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u30cd\u30ac\u30c6\u30a3\u30d6\u30ad\u30e3\u30c3\u30b7\u30e5\u3068\u306f\u3001\u30cd\u30ac\u30c6\u30a3\u30d6\u306aDNS\u5fdc\u7b54\uff08\u300c\u30c9\u30e1\u30a4\u30f3\u304c\u898b\u3064\u304b\u3089\u306a\u3044\u300d\u306a\u3069\uff09\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u6307\u3059\u3002\u3053\u308c\u306b\u306fTTL\u5024\u3082\u3042\u308a\u3001\u30a8\u30e9\u30fc\u3092\u3088\u308a\u8fc5\u901f\u306b\u4fee\u6b63\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u3001\u901a\u5e38\u306f\u80af\u5b9a\u5fdc\u7b54\u3088\u308a\u3082\u77ed\u3044TTL\u5024\u304c\u8a2d\u5b9a\u3055\u308c\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u4e0d\u6b63\u78ba\u306a\u30a8\u30f3\u30c8\u30ea\u304c\u8fc5\u901f\u306b\u66f4\u65b0\u3055\u308c\u3001DNS\u30b7\u30b9\u30c6\u30e0\u5168\u4f53\u306e\u4fe1\u983c\u6027\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002<\/p>\n
IPsec\u306e\u3088\u3046\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u306f\u3001TTL\u306f\u30ea\u30d7\u30ec\u30a4\u653b\u6483\u3092\u9632\u3050\u305f\u3081\u306b\u4f7f\u308f\u308c\u308b\u3002TTL\u5024\u304c\u671f\u9650\u5207\u308c\u306e\u30d1\u30b1\u30c3\u30c8\u306f\u6f5c\u5728\u7684\u306b\u5371\u967a\u3067\u3042\u308b\u3068\u307f\u306a\u3055\u308c\u3001\u7834\u68c4\u3055\u308c\u308b\u3002\u3053\u308c\u306f\u3001\u53e4\u3044\u30d1\u30b1\u30c3\u30c8\u3092\u518d\u5229\u7528\u3057\u3066\u4e0d\u6b63\u306a\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u5b9f\u884c\u3059\u308b\u53ef\u80fd\u6027\u3092\u5236\u9650\u3059\u308b\u3053\u3068\u3067\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u901a\u4fe1\u306e\u5b8c\u5168\u6027\u3068\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306b\u8ca2\u732e\u3059\u308b\u3002<\/p>\n
\u5148\u9032\u7684\u306a\u30b7\u30b9\u30c6\u30e0\u306e\u4e2d\u306b\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u5229\u7528\u7387\u3001\u30b5\u30fc\u30d0\u30fc\u306e\u5bb9\u91cf\u3001\u691c\u51fa\u3055\u308c\u305f\u8105\u5a01\u306a\u3069\u306e\u8981\u56e0\u306b\u57fa\u3065\u3044\u3066\u3001TTL\u5024\u3092\u52d5\u7684\u306b\u8abf\u6574\u3059\u308b\u3082\u306e\u3082\u3042\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u3088\u308a\u67d4\u8edf\u3067\u52b9\u7387\u7684\u306a\u30ea\u30bd\u30fc\u30b9\u5229\u7528\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u52d5\u7684\u306a\u8abf\u6574\u306b\u3088\u308a\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306f\u3088\u308a\u8fc5\u901f\u306b\u5909\u5316\u306b\u5bfe\u5fdc\u3057\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u6700\u9069\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u3057\u304b\u3057\u3001\u3053\u306e\u3088\u3046\u306a\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u30fb\u30e1\u30ab\u30cb\u30ba\u30e0\u306b\u306f\u3001\u671b\u307e\u3057\u304f\u306a\u3044\u526f\u4f5c\u7528\u3092\u5f15\u304d\u8d77\u3053\u3059\u3053\u3068\u306a\u304f\u3001\u5909\u66f4\u304c\u5b9f\u969b\u306b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30fb\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5411\u4e0a\u3055\u305b\u308b\u3088\u3046\u3001\u6ce8\u610f\u6df1\u3044\u76e3\u8996\u3068\u30a4\u30f3\u30c6\u30ea\u30b8\u30a7\u30f3\u30c8\u306a\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u304c\u5fc5\u8981\u3067\u3042\u308b\u3002<\/p>\n
\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u304c\u8907\u96d1\u5316\u3057\u3001\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u30c7\u30fc\u30bf\u306e\u91cd\u8981\u6027\u304c\u5897\u3059\u306b\u3064\u308c\u3001TTL\u3092\u3081\u3050\u308b\u6982\u5ff5\u3082\u9032\u5316\u3057\u3066\u3044\u308b\uff1a<\/p>\n
1. \u30a4\u30f3\u30c6\u30ea\u30b8\u30a7\u30f3\u30c8\u306aTTL\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\uff1a\u6a5f\u68b0\u5b66\u7fd2\u3092\u4f7f\u3063\u3066\u3001\u904e\u53bb\u306e\u30c7\u30fc\u30bf\u3068\u73fe\u5728\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u72b6\u6cc1\u306b\u57fa\u3065\u3044\u3066\u6700\u9069\u306aTTL\u5024\u3092\u4e88\u6e2c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002
\n2. \u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u4f9d\u5b58\u306eTTL\uff1aTTL\u5024\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u4f4d\u7f6e\u3001\u30c7\u30d0\u30a4\u30b9\u306e\u30bf\u30a4\u30d7\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u54c1\u8cea\u306a\u3069\u306e\u8981\u56e0\u306b\u57fa\u3065\u3044\u3066\u52d5\u7684\u306b\u8abf\u6574\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002
\n3. \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u6a5f\u80fd\u306e\u5f37\u5316TTL\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u653b\u6483\u306e\u691c\u51fa\u3068\u9632\u6b62\u306b\u304a\u3044\u3066\u3001\u3088\u308a\u5927\u304d\u306a\u5f79\u5272\u3092\u679c\u305f\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3002
\n4. SDN\uff08Software-Defined Networking\uff09\u3068\u306e\u7d71\u5408\uff1aSDN\u74b0\u5883\u3067\u306f\u3001TTL\u5024\u3092\u4e00\u5143\u7684\u306b\u7ba1\u7406\u3057\u3001\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u3067\u8abf\u6574\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n
\u3053\u308c\u3089\u306e\u958b\u767a\u306b\u3088\u308a\u3001\u6700\u65b0\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u9ad8\u307e\u308b\u8981\u4ef6\u306b\u5bfe\u5fdc\u3057\u305f\u3001\u3088\u308a\u52b9\u7387\u7684\u3067\u5b89\u5168\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u6280\u8853\u306e\u5229\u7528\u304c\u7d04\u675f\u3055\u308c\u308b\u3002<\/p>\n
TTL\u3092\u6700\u5927\u9650\u306b\u6d3b\u7528\u3059\u308b\u305f\u3081\u306b\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7ba1\u7406\u8005\u3084\u958b\u767a\u8005\u306f\u3044\u304f\u3064\u304b\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306b\u5f93\u3046\u3079\u304d\u3067\u3042\u308b\uff1a<\/p>\n
- TTL\u8a2d\u5b9a\u3092\u5b9a\u671f\u7684\u306b\u30c1\u30a7\u30c3\u30af\u3059\u308b\uff1aTTL\u5024\u304c\u5b9a\u671f\u7684\u306b\u30c1\u30a7\u30c3\u30af\u3055\u308c\u3001\u73fe\u5728\u306e\u8981\u4ef6\u306b\u5408\u308f\u305b\u3066\u8abf\u6574\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002
\n- \u30ad\u30e3\u30c3\u30b7\u30e5\u3068\u6700\u65b0\u6027\u306e\u30d0\u30e9\u30f3\u30b9\uff1aTTL\u3092\u9577\u304f\u3059\u308b\u3053\u3068\u306b\u3088\u308b\u30b5\u30fc\u30d0\u30fc\u8ca0\u8377\u306e\u8efd\u6e1b\u3068\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u6700\u65b0\u306b\u4fdd\u3064\u5fc5\u8981\u6027\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u898b\u3064\u3051\u308b\u3002
\n- \u76e3\u8996\u30c4\u30fc\u30eb\u306e\u4f7f\u7528\uff1a\u76e3\u8996\u30c4\u30fc\u30eb\u3092\u4f7f\u7528\u3057\u3066\u3001TTL\u8a2d\u5b9a\u304c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30fb\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u53ca\u307c\u3059\u5f71\u97ff\u3092\u76e3\u8996\u3059\u308b\u3002
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