[Yeti DNS Discuss] Observation on Large response issue during Yeti KSK rollover

Davey Song(宋林健) ljsong at biigroup.cn
Wed Aug 2 01:35:59 UTC 2017

Hi folks,


I put a article to introduce some observations during Last Yeti KSK rollover
which is finished in this May. 



The conclusion is quoted as follows:


The monitoring result shows that statistically large packets will trigger
higher failure rate (around 0.7%) due to IPv6 fragmentation issues, which
accordingly increase probability of retries and TCP fallback. It should be
noted that during the KSK rollover and other experience in Yeti testbed, no
error report was spotted directly due to packet size problem (less than 1%
likely to cause timeout). So it is should be further observed and evaluate
the impact of large packets issue. To avoid less than 1% anomaly, we can
consider is it worthwhile to take any measures to this issue? Does it sound
like a plan to use stateful connection in the first place to transmit DNS
like TCP or HTTP for queries causing large response, or
fragmenting the packets in the DNS layer? 


Best regards,


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