{"id":192,"date":"2019-02-02T18:34:50","date_gmt":"2019-02-02T09:34:50","guid":{"rendered":"https:\/\/tako.nakano.net\/blog\/?p=192"},"modified":"2019-02-02T18:34:50","modified_gmt":"2019-02-02T09:34:50","slug":"is_dns_rollback_","status":"publish","type":"post","link":"https:\/\/tako.nakano.net\/blog\/2019\/02\/is_dns_rollback_\/","title":{"rendered":"DNS \u306e\u8a2d\u5b9a\u304c\u3046\u307e\u304f\u3044\u304b\u305a\u3001\u623b\u308b\u3088\u3046\u306a\u73fe\u8c61\u306b\u3064\u3044\u3066\u8003\u5bdf\u3059\u308b"},"content":{"rendered":"<p>\u79c1\u3082\u9593\u9055\u3063\u3066\u3044\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u306e\u3067\u3001\u5909\u306a\u3068\u3053\u308d\u304c\u3042\u308c\u3070\u6307\u6458\u3057\u3066\u9802\u304d\u305f\u3044\u3002<\/p>\n<h1>\u6a29\u5a01\u30b5\u30fc\u30d0\u3078\u306e\u554f\u3044\u5408\u308f\u305b<\/h1>\n<p>\u307e\u305a\u3001DNS \u306b\u306f\u6a29\u5a01\u30b5\u30fc\u30d0\u3068\u547c\u3070\u308c\u308b\u30b5\u30fc\u30d0\u3068\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u3068\u547c\u3070\u308c\u308b\u30b5\u30fc\u30d0\u304c\u3042\u308b\u3002<br \/>\n\u30c9\u30e1\u30a4\u30f3\u306e\u7ba1\u7406\u753b\u9762\u304b\u3089\u8a2d\u5b9a\u3092\u3057\u3066\u3001\u8a2d\u5b9a\u304c\u66f8\u304d\u51fa\u3055\u308c\u308b\u306e\u306f\u3001\u6a29\u5a01\u30b5\u30fc\u30d0\u3067\u3042\u308b\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001www.example.com \u306e\u6a29\u5a01\u30b5\u30fc\u30d0\u3092\u8abf\u3079\u306b\u884c\u304d\u305f\u3051\u308c\u3070\u3001\u30eb\u30fc\u30c8\u30b5\u30fc\u30d0\u304b\u3089\u8fbf\u308b\u3002<\/p>\n<pre>dig +norec NS www.example.com @a.root-servers.net.<\/pre>\n<p>\u3068\u3059\u308b\u3002<\/p>\n<pre>;; -&gt;&gt;HEADER&lt;&lt;- opcode: QUERY, status: NOERROR, id: 43407\r\n;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 13, ADDITIONAL: 27\r\n\r\n;; OPT PSEUDOSECTION:\r\n; EDNS: version: 0, flags:; udp: 4096\r\n;; QUESTION SECTION:\r\n;www.example.com. IN NS\r\n\r\n;; AUTHORITY SECTION:\r\ncom. 172800 IN NS e.gtld-servers.net.\r\ncom. 172800 IN NS b.gtld-servers.net.\r\n...\r\n;; ADDITIONAL SECTION:\r\ne.gtld-servers.net. 172800 IN A 192.12.94.30\r\ne.gtld-servers.net. 172800 IN AAAA 2001:502:1ca1::30\r\nb.gtld-servers.net. 172800 IN A 192.33.14.30\r\nb.gtld-servers.net. 172800 IN AAAA 2001:503:231d::2:30\r\n...<\/pre>\n<p>\u306e\u3088\u3046\u306a\u5fdc\u7b54\u304c\u3042\u308b\u306f\u305a\u3060\u3002\u5927\u4e8b\u306a\u306e\u306f\u3001AUTHORITY SECTION \u3060\u3002\u3053\u3053\u304c\u3001\u6b21\u306b\u898b\u306b\u884c\u304f\u5148\u306e\u30b5\u30fc\u30d0\u3092\u793a\u3057\u3066\u3044\u308b\u3002\u30b5\u30fc\u30d0\u306e IP \u30a2\u30c9\u30ec\u30b9\u306f\u3001ADDITIONAL SECTION \u306b\u793a\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n<pre>dig +norec NS www.example.com @a.gtld-servers.net.<\/pre>\n<p>\u3068\u3059\u308b\u3068<\/p>\n<pre>example.com. 172800 IN NS a.iana-servers.net.<\/pre>\n<p>\u3068\u5fdc\u7b54\u304c\u3042\u308b\u3002<\/p>\n<pre>dig +norec NS www.example.com @a.iana-servers.net.<\/pre>\n<p>\u3068\u3059\u308b\u3068<\/p>\n<pre>;; AUTHORITY SECTION:\r\nexample.com. 3600 IN SOA sns.dns.icann.org. noc.dns.icann.org. 2018112845 7200 3600 1209600 3600<\/pre>\n<p>\u306a\u306e\u3067\u3001SOA \u30ec\u30b3\u30fc\u30c9\u304c\u8fd4\u3063\u3066\u304d\u305f\u3002\u3053\u308c\u3067\u3001a.iana-servers.net. \u304c\u8cac\u4efb\u3092\u3082\u3063\u305f\u30b5\u30fc\u30d0\u3067\u3042\u308b\u3068\u3044\u3046\u3053\u3068\u304c\u5206\u304b\u308b\u3002\u4ee5\u964d\u306f a.iana-servers.net. \u306b\u554f\u3044\u5408\u308f\u305b\u308b\u3002<\/p>\n<pre>dig +norec A www.example.com @a.iana-servers.net.<\/pre>\n<p>\u306b\u5bfe\u3057\u3066<\/p>\n<pre>;; ANSWER SECTION:\r\nwww.example.com . 86400 IN A 93.184.216.34<\/pre>\n<p>\u3088\u308a\u3001www.example.com. \u306e IP \u30a2\u30c9\u30ec\u30b9\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u305f\u3002<\/p>\n<h1>\u3044\u3061\u3044\u3061\u63a2\u3059\u306e\u306f\u3084\u3063\u3066\u3089\u308c\u306a\u3044\u2026\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0<\/h1>\n<p>\u3044\u3061\u3044\u3061\u3001\u307e\u305a\u6a29\u5a01\u30b5\u30fc\u30d0\u3092\u63a2\u3057\u3001\u6b21\u306b\u3001\u672c\u6765\u306e\u554f\u3044\u5408\u308f\u305b\u3092\u3059\u308b\u2026\u306e\u306f\u9762\u5012\u3067\u3084\u3063\u3066\u3089\u308c\u306a\u3044\u306e\u3067\u3001\u3053\u306e\u6d41\u308c\u3092\u4ee3\u308f\u308a\u306b\u3057\u3066\u304f\u308c\u308b\u306e\u304c\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u3068\u601d\u3063\u3066\u3088\u3044\u3002<\/p>\n<p>\u4eca\u307e\u3067\u51fa\u3066\u304d\u305f 86400 \u3068\u3044\u3046\u306e\u306f TTL \u3068\u547c\u3070\u308c\u3001\u300c\u3053\u306e\u79d2\u6570\u307e\u3067\u306f\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u3066\u3088\u3044\u3088\u300d\u3068\u3044\u3046\u6570\u5b57\u3067\u3042\u308b\u3002\u3053\u306e\u6642\u9593\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u306f\u3001\u540c\u4e00\u306e\u554f\u3044\u5408\u308f\u305b\u306b\u3001\u899a\u3048\u3066\u3044\u305f(\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u305f)\u5024\u3092\u8fd4\u3057\u3066\u3088\u3044\u3002\u9006\u306b\u3001\u4eca\u3059\u3050\u306b\u8a2d\u5b9a\u3092\u66f8\u304d\u63db\u3048\u3066\u3082\u300186400\u79d2\u306f\u65b0\u3057\u3044\u8a2d\u5b9a\u3092\u898b\u3066\u3082\u3089\u3048\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308b\u3068\u3044\u3046\u3053\u3068\u3060\u3002<\/p>\n<h1>\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u3078\u306e\u554f\u3044\u5408\u308f\u305b<\/h1>\n<p>+norec \u3092\u5916\u3057\u3066<\/p>\n<pre>dig A www.example.com @8.8.8.8<\/pre>\n<p>8.8.8.8 \u3092\u597d\u304d\u3067\u306f\u306a\u3044\u65b9\u306b\u306f\u7533\u3057\u8a33\u306a\u3044\u304c\u2026\u7b49\u3068\u3057\u3066\u307f\u308b\u30028.8.8.8 \u306f\u516c\u958b\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u3067\u3042\u308b\u3002<\/p>\n<pre>;; ANSWER SECTION:\r\nwww.example.com. 4676 IN A 93.184.216.34<\/pre>\n<p>\u3068\u7b54\u3048\u304c\u8fd4\u3063\u3066\u304f\u308b\u3002TTL \u306e\u5024\u304c\u9055\u3046\u306e\u304c\u5206\u304b\u308b\u3060\u308d\u3046\u3002<\/p>\n<h1>\u30ad\u30e3\u30c3\u30b7\u30e5\u3059\u308b\u306e\u306f\u8ab0\uff1f<\/h1>\n<p>\u3067\u306f\u3001\u4e00\u822c\u7684\u306a\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u30a2\u30af\u30bb\u30b9\u3059\u308b\u969b\u306b\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u3057\u3066\u3057\u307e\u3046\u306e\u306f\u8ab0\u304b\u3068\u3044\u3046\u3068\u3001<br \/>\n\u30fb\u4f7f\u3063\u3066\u3044\u308b PC<br \/>\n\u30fbPC \u306e\u554f\u3044\u5408\u308f\u305b\u5148\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0<br \/>\n\u3067\u3042\u308b\u3068\u8003\u3048\u3089\u308c\u308b\u3002\u4f7f\u3063\u3066\u3044\u308b PC \u306e\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u6642\u9593\u304c\u3044\u304f\u3089\u3050\u3089\u3044\u306a\u306e\u304b\u306f\u3001\u5c11\u3057\u8abf\u3079\u305f\u304c\u308f\u304b\u3089\u306a\u304b\u3063\u305f\u3002(TTL \u4ee5\u4e0b\u3067\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u30af\u30ea\u30a2\u3057\u3066\u3082\u554f\u984c\u304c\u306a\u3044\u306e\u3067\u3042\u308b)<\/p>\n<p>\u554f\u3044\u5408\u308f\u305b\u5148\u306f\u3001DHCP \u3067\u8a2d\u5b9a\u3055\u308c\u308b\u3053\u3068\u3082\u3042\u308b\u3002\u7d50\u5c40 ISP \u306e\u30b5\u30fc\u30d0\u3068\u306a\u308b\u3053\u3068\u304c\u591a\u3044\u3060\u308d\u3046\u3002<\/p>\n<h1>\u8a2d\u5b9a\u304c\u623b\u3063\u305f\u308a\u3059\u308b\u306e\u306f\u306a\u305c\u306a\u306e\u3055<\/h1>\n<p>\u57fa\u672c\u7684\u306b\u3001\u554f\u3044\u5408\u308f\u305b\u5148\u306e\u30ad\u30e3\u30c3\u30b7\u30e5 DNS \u30b5\u30fc\u30d0\u2026\u3064\u307e\u308a\u512a\u5148 DNS \u30b5\u30fc\u30d0\u306f1\u53f0\u306a\u306e\u3067\u3001\u623b\u308b\u3053\u3068\u306f\u306a\u3055\u305d\u3046\u306a\u6c17\u304c\u3059\u308b\u3002<\/p>\n<p>\u3053\u3053\u304b\u3089\u304c\u9762\u5012\u306a\u306e\u3060\u304c\u3001\u300c\u540c\u4e00 IP \u3067\u5b9f\u306f\u8907\u6570\u306e\u30de\u30b7\u30f3\u304c\u4e16\u754c\u306e\u3042\u3061\u3053\u3061\u306b\u5b58\u5728\u3059\u308b\u300d\u3068\u3044\u3046\u3053\u3068\u304c\u8a31\u3055\u308c\u3066\u304a\u308a\u3001\u305d\u306e\u3088\u3046\u306a\u5834\u5408\u306f\u3001\u8907\u6570\u306e\u30de\u30b7\u30f3\u3067\u5225\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u5fdc\u7b54\u3092\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u305d\u3046\u3060\u3002<\/p>\n<p>dig \u306e\u554f\u3044\u5408\u308f\u305b\u5148\u3092\u3001\u305d\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u306e IP \u306b\u8a2d\u5b9a\u3057\u3066\u3001\u554f\u3044\u5408\u308f\u305b\u3092\u7e70\u308a\u8fd4\u3057\u3066\u78ba\u8a8d\u3059\u308b\u306e\u304c\u3001\u300c\u4eca\u4f55\u304c\u8d77\u304d\u3066\u3044\u308b\u304b\u300d\u3092\u628a\u63e1\u3059\u308b\u305f\u3081\u306e\u30011\u756a\u306e\u8fd1\u9053\u3060\u3068\u601d\u308f\u308c\u308b\u3002<\/p>\n<p>\u6a29\u5a01\u30b5\u30fc\u30d0\u5074\u306b\u3064\u3044\u3066\u3082\u540c\u3058\u554f\u984c(IP anycast \u3084 \u8ca0\u8377\u5206\u6563)\u306f\u751f\u3058\u3048\u308b\u304c\u3001\u3053\u3061\u3089\u306f\u9045\u308c\u304c\u3042\u307e\u308a\u306a\u3044\u3046\u3061\u306b\u540c\u671f\u3055\u308c\u308b\u3088\u3046\u306b\u3001\u30c9\u30e1\u30a4\u30f3\u7ba1\u7406\u696d\u8005\u304c\u30de\u30cd\u30b8\u30e1\u30f3\u30c8\u3057\u3066\u3044\u308b\u306f\u305a\u3067\u3042\u308b\u3002<\/p>\n<p><a href=\"http:\/\/www.geekpage.jp\/blog\/?id=2011\/10\/27\/1\" target=\"_blank\" rel=\"noopener\">\u306a\u305c\u300cDNS\u306e\u6d78\u900f\u300d\u306f\u554f\u984c\u8996\u3055\u308c\u308b\u306e\u304b<\/a>\u00a0\u306f\u826f\u3044\u8a18\u4e8b\u306a\u306e\u3067\u3001\u305c\u3072\u76ee\u3092\u901a\u3057\u3066\u3044\u305f\u3060\u304d\u305f\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u79c1\u3082\u9593\u9055\u3063\u3066\u3044\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u306e\u3067\u3001\u5909\u306a\u3068\u3053\u308d\u304c\u3042\u308c\u3070\u6307\u6458\u3057\u3066\u9802\u304d\u305f\u3044\u3002 \u6a29\u5a01\u30b5\u30fc\u30d0\u3078\u306e\u554f\u3044\u5408\u308f\u305b \u307e\u305a\u3001DNS \u306b\u306f\u6a29\u5a01\u30b5\u30fc\u30d0\u3068\u547c\u3070\u308c\u308b\u30b5\u30fc\u30d0\u3068\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u3068\u547c\u3070\u308c\u308b\u30b5\u30fc\u30d0\u304c\u3042\u308b\u3002 \u30c9\u30e1\u30a4\u30f3\u306e\u7ba1\u7406\u753b\u9762\u304b\u3089\u8a2d\u5b9a\u3092\u3057 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3],"tags":[],"class_list":["post-192","post","type-post","status-publish","format-standard","hentry","category-misc"],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p4dIdP-36","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/tako.nakano.net\/blog\/wp-json\/wp\/v2\/posts\/192","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tako.nakano.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tako.nakano.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tako.nakano.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tako.nakano.net\/blog\/wp-json\/wp\/v2\/comments?post=192"}],"version-history":[{"count":1,"href":"https:\/\/tako.nakano.net\/blog\/wp-json\/wp\/v2\/posts\/192\/revisions"}],"predecessor-version":[{"id":193,"href":"https:\/\/tako.nakano.net\/blog\/wp-json\/wp\/v2\/posts\/192\/revisions\/193"}],"wp:attachment":[{"href":"https:\/\/tako.nakano.net\/blog\/wp-json\/wp\/v2\/media?parent=192"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tako.nakano.net\/blog\/wp-json\/wp\/v2\/categories?post=192"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tako.nakano.net\/blog\/wp-json\/wp\/v2\/tags?post=192"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}