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Cisco Bug: CSCvv75649 - Large tcp stream fails DNS translation

Last Modified

Oct 10, 2020

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

16.9.5

Description (partial)

Symptom:
Network address translation (NAT) Application-level gateway (ALG) for DNS can fail to process TCP stream
containing large number of address records.

Documentation is not clear about maximum supported message size, but exceeding it shall reset
the connection rather than delivering invalid data.

Conditions:
Rarely, the DNS response delivered over TCP can contain over 640 records. With outside nat they should
get translated, but they are delivered as arrived.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
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