[dns-operations] Question about resolver behavior vis-a-vis CNAME

Vithalprasad Gaitonde gaitonde.vithalprasad at microsoft.com
Wed Sep 16 07:52:22 UTC 2015


The name server for www.csrc.gov.cn<http://www.csrc.gov.cn> seem to have a CNAME and SOA record at www.csrc.gov.cn<http://www.csrc.gov.cn>.

Since RFC 1034 states that "If a CNAME RR is present at a node, no other data should be present...", what is the expected behavior for a resolver which receives the below response while recurring a query for A record at www.csrc.gov.cn<http://www.csrc.gov.cn>

www.csrc.gov.cn.<javascript:addhost('www.csrc.gov.cn.')>       1800    IN      CNAME<http://www.ietf.org/rfc/rfc1035.txt>   www.csrc.gov.chinacache.net.<javascript:addhost('www.csrc.gov.chinacache.net.')>

www.csrc.gov.cn.<javascript:addhost('www.csrc.gov.cn.')>       900     IN      SOA<http://www.ietf.org/rfc/rfc1035.txt>     ns.csrc.gov.cn.<javascript:addns('ns.csrc.gov.cn.')> root.csrc.gov.cn.<mailto:root at csrc.gov.cn?subject=www.csrc.gov.cn> 200212011 28800 14400 60 900

Should the resolver return srv fail to the client.



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