{"author_name":"hirose31","type":"rich","version":"1.0","published":"2013-07-02 14:06:10","provider_name":"Hatena Blog","url":"https://hirose31.hatenablog.jp/entry/20130702/1372741570","description":"\u7d50\u8ad6\u304b\u3089\u3044\u3046\u3068\u3001 \u554f\u3044\u5408\u308f\u305b\u305f\u540d\u524d\u304c\u898b\u3064\u304b\u3089\u306a\u304b\u3063\u305f\u5834\u5408\u306enxdomain\u5fdc\u7b54\u306f\u5f53\u8a72\u30c9\u30e1\u30a4\u30f3\u306eSOA\u30ec\u30b3\u30fc\u30c9\u304c\u8fd4\u3063\u3066\u304d\u3066\u3001\u30cd\u30ac\u30c6\u30a3\u30d6\u30ad\u30e3\u30c3\u30b7\u30e5\u306eTTL\u306f\u305d\u306e\u5fdc\u7b54(SOA)\u306eTTL\u306b\u306a\u308b \u3067\u3059\u3002 \u4ee5\u4e0b\u3001\u8a73\u7d30\u3002nxdomain\u5fdc\u7b54\u306e\u969b\u306eSOA\u306eTTL\u306f\u3001SOA\u306e(TTL\u3067\u306f\u306a\u304f)minimum\u3067\u6307\u5b9a\u3067\u304d\u308b\u3053\u3068\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u300cSOA\u306eminimum\u306f\u901a\u5e38\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u306eTTL\u3067\u306f\uff1f\u300d\u3068\u601d\u3063\u305f\u3042\u306a\u305f\u3001\u79c1\u3082\u305d\u3046\u899a\u3048\u3066\u305f\u306e\u3067\u3059\u304c\u30011998\u5e74\u306b\u51fa\u305fRFC 2308 Negative Caching of DNS Queries (DNS NCACHE)\u3067\u7528\u9014\u304c\u5909\u66f4\u3055\u308c\u305f\u305d\u3046\u3067\u3059\u3002 \u25bcSOA\u306eminimum\u5024\u2026","blog_title":"\uff08\u3072\uff09\u30e1\u30e2","height":"190","width":"100%","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhirose31.hatenablog.jp%2Fentry%2F20130702%2F1372741570\" title=\" DNS\u306e\u30cd\u30ac\u30c6\u30a3\u30d6\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6b8b\u5b58\u6642\u9593(TTL)\u306f\u3069\u306e\u3088\u3046\u306b\u3057\u3066\u6c7a\u307e\u308b\u304b - \uff08\u3072\uff09\u30e1\u30e2\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","blog_url":"https://hirose31.hatenablog.jp/","title":" DNS\u306e\u30cd\u30ac\u30c6\u30a3\u30d6\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6b8b\u5b58\u6642\u9593(TTL)\u306f\u3069\u306e\u3088\u3046\u306b\u3057\u3066\u6c7a\u307e\u308b\u304b","provider_url":"https://hatena.blog","author_url":"https://blog.hatena.ne.jp/hirose31/","categories":["dns"],"image_url":null}