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Cisco Bug: CSCvu73873 - C9800-80 WLC Sending client traffic out of AP Manager interface

Last Modified

Oct 27, 2020

Products (2)

  • Cisco Wireless LAN Controller Software
  • Cisco Catalyst 9800 Series Wireless Controllers

Known Affected Releases

16.12.2s

Description (partial)

Symptom:
ACL applied outbound on wireless management/ap manager interface. ACL only permits source from AP manager IP to any. Deny ACE hits logs increment.

From the deny hit log, it is seen that dns traffic (dest port 53) sourced from wireless client destined to opendns server (defined as the name-server on C9800) is being dropped. It implies, WLC is leaking client traffic to ap manager interface.

Conditions:
Basic setup in TAC lab see the same deny hit. 

C9800 running 16.12.2s configured with a PSK SSID. One client is connected. No explicit traffic flow other than whatever traffic a connected client sends.
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