Dear bind-users.
Our NSC, has time to time complaining for such malicious DNS request for few malicious domains. Whereas my DNS servers are up-to-date (BIND 9.12.3-P1) and only our own network is allowed to access. Complain from NCSA, Nation cyber security Agency. Up on checking the logs. I found several entries. And you know based on the below logs I cannot find the source IP unless I enable the query logs. If I enabled the system performs will slow down? Please any ones advice would be highly appreciated. ::1#53 /var/log/messages-20190203:Feb 1 21:13:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:d1::1#53 /var/log/messages-20190203:Feb 1 21:13:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:c1::1#53 /var/log/messages-20190203:Feb 1 21:13:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:d0::1#53 /var/log/messages-20190203:Feb 1 21:13:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:c0::1#53 /var/log/messages-20190203:Feb 1 21:13:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:e0::1#53 /var/log/messages-20190203:Feb 1 21:13:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:e1::1#53 /var/log/messages-20190203:Feb 1 21:43:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:c0::1#53 /var/log/messages-20190203:Feb 1 21:43:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:d1::1#53 /var/log/messages-20190203:Feb 1 21:43:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:d0::1#53 /var/log/messages-20190203:Feb 1 21:43:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:e1::1#53 /var/log/messages-20190203:Feb 1 21:43:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:e0::1#53 /var/log/messages-20190203:Feb 1 21:43:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:c1::1#53 /var/log/messages-20190203:Feb 1 22:13:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:c1::1#53 /var/log/messages-20190203:Feb 1 22:13:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:d0::1#53 /var/log/messages-20190203:Feb 1 22:13:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:e0::1#53
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