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<DIV>Ok, next time I will post questions to <A
href="mailto:bind-users@isc.org">bind-users@isc.org</A>.</DIV>
<DIV>Yes, BIND maybe consilidate answers just like you said when receiving
large amount of requests for the same records.</DIV>
<DIV>I will capture inbound and outbound traffic and compare it to
querylog.</DIV>
<DIV>Thanks. </DIV></DIV>
<DIV> </DIV>
<HR style="WIDTH: 210px; HEIGHT: 1px" align=left color=#b5c4df SIZE=1>
<DIV><SPAN>Liu Mingxing</SPAN></DIV>
<DIV> </DIV>
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<DIV><B>From:</B> <A href="mailto:dougb@dougbarton.us">Doug
Barton</A></DIV>
<DIV><B>Date:</B> 2013-01-26 03:15</DIV>
<DIV><B>To:</B> <A
href="mailto:dns-operations@lists.dns-oarc.net">dns-operations</A></DIV>
<DIV><B>Subject:</B> Re: [dns-operations] All requests are logged by
BIND?</DIV></DIV></DIV>
<DIV>
<DIV>On 01/25/2013 01:11 PM, Liu Mingxing wrote:</DIV>
<DIV>> All requests are logged by BIND?</DIV>
<DIV>> By a rrdtool, I found that DNS traffic of router before an authoritative</DIV>
<DIV>> nameserver is larger than those seen from querylog. For example, cacti</DIV>
<DIV>> tells us qps is 2k while querylog shows a smaller qps.</DIV>
<DIV>> Is it just because BIND could not records all requests when</DIV>
<DIV>> large traffic of queries come to it? </DIV>
<DIV> </DIV>
<DIV>FYI, this question would be better on bind-users@isc.org, but it's</DIV>
<DIV>arguably on-topic here, so ...</DIV>
<DIV> </DIV>
<DIV>What is likely happening is that you are receiving a percentage of</DIV>
<DIV>repeat requests from the same remote servers for the same records. BIND</DIV>
<DIV>is fairly intelligent about consolidating the answers to such requests.</DIV>
<DIV>I'm not sure if that would affect the logging in the way you describe,</DIV>
<DIV>but I imagine it probably does.</DIV>
<DIV> </DIV>
<DIV>The way that you can determine this for sure would be to actually</DIV>
<DIV>capture the packets going in and out, and compare number of identical</DIV>
<DIV>questions to the number of answers.</DIV>
<DIV> </DIV>
<DIV>hope this helps,</DIV>
<DIV> </DIV>
<DIV>Doug</DIV>
<DIV> </DIV>
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