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Cisco Bug: CSCvt89337 - Incorrect Source IP when resolving DNS

Last Modified

Oct 14, 2020

Products (14)

  • Cisco 2600 Series Multiservice Platforms
  • Cisco 1000 Series Integrated Services Routers
  • Cisco Catalyst 9500 Series Switches
  • Cisco Catalyst 3650 Series Switches
  • Cisco Catalyst 3850 Series Switches
  • Cisco 4000 Series Integrated Services Routers
  • Cisco Catalyst 9800 Series Wireless Controllers
  • Cisco Catalyst 9200 Series Switches
  • Cisco Catalyst 9600 Series Switches
  • Cisco ASR 1000 Series Aggregation Services Routers
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Known Affected Releases


Description (partial)

We were using "ip name-server" to allow router to resolve Domains however the DNS query was NOT using as the Source IP the outgoing interface but any other interface in UP state.

This issue was reproduced on lab using C1101-4P, ISR4351, ISR4451, using IOS Version 16.9.4 and 17.1.1.

Configuration  used: ip name-server (server IP)
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