Avamar : Duplicate IP Address bond0 XXX.XXX.XXX.XXX MAC=xx:xx:xx:xx:xx:xx MAC=xx:xx:xx:xx:xx:xx

The RMM/DRAC IP was changed from XXX:XXX:XXX:123  to  XXX:XXX:XXX:234

PROBLEM:

2017-08-29 10:05:19 (+0200) 4107124 ERROR: The ip address XXX:XXX:XXX:XXX is assigned to multiple MAC addresses: xx:xx:xx:xx:xx:xx,xx:xx:xx:xx:xxxx
2017-08-29 10:05:20 (+0200) 4107124 ERROR: - operation failed

Here is output of Avamar installation manager:


The proactive check script point to same duplicate IP issue.

ERROR:  Duplicate IP Address bond0 XXX:XXX:XXX:XXX MAC=xx:xx:xx:xx:xx:xx MAC=xx:xx:xx:xx:xx:xx
ERROR:  Duplicate IP Address   MAC=xx:xx:xx:xx:xx:xx MAC=xx:xx:xx:xx:xx:xx
ERROR:  Duplicate IP Address   MAC=xx:xx:xx:xx:xx:xx MAC=xx:xx:xx:xx:xx:xx
RESOLUTION: Find duplicate IP addresses and fix. Try 'arping -c3 <ip>'

# --> Duplicate IP                   *FAILED*

During troubleshooting curse we found that RMM/DRAC network interface was configured to use same IP as bond0 NIC adapter.
This caused duplicated IP Addresses and two MAC addresses pointed to same IP.  Check 'arping' output below.
 

root@XXXXXXXXXXXX010:~/#: arping -c2 -I bond0 160.xxx.xxx.xxx
ARPING 160.220.243.184 from 160.220.243.176 bond0
Unicast reply from 60.xxx.xxx.xxx [00:xx:xx:xx:BC:B4]  0.591ms              # first MAC address
Unicast reply from 60.xxx.xxx.xxx [00:xx:xx:xx:BC:B8]  1.087ms              # second MAC address which is different from first one
Unicast reply from 60.xxx.xxx.xxx [00:xx:xx:xx:BC:B4]  2.378ms
Unicast reply from 60.xxx.xxx.xxx [00:xx:xx:xx:BC:B8]  2.892ms
Sent 2 probes (1 broadcast(s))
Received 4 response(s)
root@XXXXXXXXXXXX010:~/#:

RESOLUTION: