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DNSのdigコマンド

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digコマンドを使って権威DNSサーバーを直接調べるとき

+norec-xオプションを付ける
+norecは非再帰検索を実行
-xは逆引き検索でIPアドレスを直接指定できる

$ dig +norec @localhost -x 192.0.2.100

digコマンドの使い方

  • 解決したDNSサーバを確認したい場合は+identifyオプションを追加
  • デフォルトはAレコード検索。 NSレコード指定じは nsをつける
  • トレースは+traceオプション
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