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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Dear bind-users.<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Our NSC, has time to time complaining for such malicious DNS request for few malicious domains. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Whereas my DNS servers are up-to-date (BIND 9.12.3-P1) and only our own network is allowed to access. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Complain from NCSA, Nation cyber security Agency. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><img width=604 height=114 id="Picture_x0020_1" src="cid:image001.png@01D4C6B9.6229C120"><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><span style='color:red'>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</span></b>. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>::1#53<o:p></o:p></p><p class=MsoNormal>/var/log/messages-20190203:Feb 1 21:13:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:d1::1#53<o:p></o:p></p><p class=MsoNormal>/var/log/messages-20190203:Feb 1 21:13:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:c1::1#53<o:p></o:p></p><p class=MsoNormal>/var/log/messages-20190203:Feb 1 21:13:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:d0::1#53<o:p></o:p></p><p class=MsoNormal>/var/log/messages-20190203:Feb 1 21:13:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:c0::1#53<o:p></o:p></p><p class=MsoNormal>/var/log/messages-20190203:Feb 1 21:13:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:e0::1#53<o:p></o:p></p><p class=MsoNormal>/var/log/messages-20190203:Feb 1 21:13:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:e1::1#53<o:p></o:p></p><p class=MsoNormal>/var/log/messages-20190203:Feb 1 21:43:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:c0::1#53<o:p></o:p></p><p class=MsoNormal>/var/log/messages-20190203:Feb 1 21:43:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:d1::1#53<o:p></o:p></p><p class=MsoNormal>/var/log/messages-20190203:Feb 1 21:43:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:d0::1#53<o:p></o:p></p><p class=MsoNormal>/var/log/messages-20190203:Feb 1 21:43:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:e1::1#53<o:p></o:p></p><p class=MsoNormal>/var/log/messages-20190203:Feb 1 21:43:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:e0::1#53<o:p></o:p></p><p class=MsoNormal>/var/log/messages-20190203:Feb 1 21:43:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:c1::1#53<o:p></o:p></p><p class=MsoNormal>/var/log/messages-20190203:Feb 1 22:13:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:c1::1#53<o:p></o:p></p><p class=MsoNormal>/var/log/messages-20190203:Feb 1 22:13:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:d0::1#53<o:p></o:p></p><p class=MsoNormal>/var/log/messages-20190203:Feb 1 22:13:27 ns10 named[19579]: network unreachable resolving 'vitaminc.pro/DS/IN': 2001:500:e0::1#53<o:p></o:p></p></div></body></html>