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Cisco Bug: CSCup97186 - Caching DNS returns SERVFAIL when RR type switches to or from CNAME

Last Modified

Feb 12, 2018

Products (1)

  • Cisco Network Registrar

Known Affected Releases

7.0 7.1 7.2(3.4)

Description (partial)

Symptom:
The DNS server may in periods return SERVFAIL instead of valid data for a query.

Conditions:
A DNS response contains a CNAME chain where a resource record changes between CNAME and A (or AAAA) types.
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