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Cisco Bug: CSCul87119 - WLC log: ICMP dest unreachable reported as invalid ping response

Last Modified

Sep 11, 2018

Products (1)

  • Cisco 5500 Series Wireless Controllers

Known Affected Releases

7.4(110.0) 7.4(111.11) 7.5(1.27) 7.6(1.43)

Description (partial)

Symptom:
The following message logs are observed on a WLC5508 in the following

Conditions:
- 7.4.110.18 escalation code (it may apply to other versions as well)
- The host configured on the WLC as SNMP trap receiver is currently not listening on port udp/162 so sending ICMP destination unreachable message to each SNMP trap (192.168..0.29 in the example below)
- there's no other ICMP/PING traffic happening between the WLC and this host

The ICMP destination unreachable is reported in the following message logs that are flooding the WLC logging:

*DHCP Socket Task: Dec 05 14:21:31.884: #LOG-3-Q_IND: rmgr_utils.c:244 Ping response from 192.168.0.29 is invalid. Incorrect checksum.[...It occurred 3 times.!]
*rmgrTrasport: Dec 05 14:21:31.066: #RMGR-3-INVALID_PING_RESPONSE: rmgr_utils.c:244 Ping response from 192.168.0.29 is invalid. Incorrect checksum.[...It occurred 6 times/sec!.]
*rmgrTrasport: Dec 05 14:21:29.815: #RMGR-3-INVALID_PING_RESPONSE: rmgr_utils.c:244 Ping response from 192.168.0.29 is invalid. Incorrect checksum.[...It occurred 2 times/sec!.]
*rmgrTrasport: Dec 05 14:21:28.002: #RMGR-3-INVALID_PING_RESPONSE: rmgr_utils.c:244 Ping response from 192.168.0.29 is invalid. Incorrect checksum.[...It occurred 4 times/sec!.]
*rmgrTrasport: Dec 05 14:21:26.051: #RMGR-3-INVALID_PING_RESPONSE: rmgr_utils.c:244 Ping response from 192.168.0.29 is invalid. Incorrect checksum.[...It occurred 2 times/sec!.]
*rmgrTrasport: Dec 05 14:21:24.057: #RMGR-3-INVALID_PING_RESPONSE: rmgr_utils.c:244 Ping response from 192.168.0.29 is invalid. Incorrect checksum.[...It occurred 4 times/sec!.]
*rmgrTrasport: Dec 05 14:21:22.944: #RMGR-3-INVALID_PING_RESPONSE: rmgr_utils.c:244 Ping response from 192.168.0.29 is invalid. Incorrect checksum.[...It occurred 4 times/sec!.]
*rmgrTrasport: Dec 05 14:21:20.175: #RMGR-3-INVALID_PING_RESPONSE: rmgr_utils.c:244 Ping response from 192.168.0.29 is invalid. Incorrect checksum.

In this specific setup the WLC is the active controller of an HA pair.

Conditions:
WLC running 7.4.110.18 code (other versions are likely to be affected as well)
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