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IDPA: Multiple MACs for the same IP

Summary: The user's network team was seeing alerts on the reports and in the switch logs of the Integrated Data Protection Appliance (IDPA). It was showing multiple MAC addresses at the switch with the same IP address. ...

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Symptoms

The Integrated Data Protection Appliance (IDPA) did not show any signs of issues from the user's end nor did it show any signs of issues from Dell Support end. The only issue and reason there was a case created was to verify that the IDPA was working as designed. 

The switch was getting alerts and notifications that there were 2 MAC addresses being resented by the same IP address that was coming for the IDPA.

Cause

To confirm and verify this issue, run the following commands:   

Log into the ACM of the IDPA using PuTTY or SSH

Steps to follow:  
  1. grep -i duplicate /var/log/messages 
look for any duplicates
  1. ifconfig 
eth0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:01 inet addr:192.168.100.100 Bcast:192.168.100.127 Mask:255.255.255.224 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:370855703 errors:0 dropped:19253 overruns:0 frame:0 TX packets:50713660 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:524843088567 (500529.3 Mb) TX bytes:13145486953 (12536.5 Mb) 

eth1 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:02 inet addr:xxx.xxx.xxx.xxx Bcast:xxx.xxx.xxx.xxx Mask:255.255.254.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2048235050 errors:0 dropped:117673 overruns:0 frame:0 TX packets:309593903 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2877892641220 (2744572.2 Mb) TX bytes:80056040523 (76347.3 Mb) 

lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:342092033 errors:0 dropped:0 overruns:0 frame:0 TX packets:342092033 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:117299088590 (111865.1 Mb) TX bytes:117299088590 (111865.1 Mb) 
  1. PuTTY or SSH to the vCenter 
command: shell
once in the shell type: ifconfig
  1. Compare and make sure that the MAC address is the same one that is listed in the switch log. 

Resolution

This is working by design. This seems to be a false-positive alert for the switch. The network team can silence this alert from the switch as it is working and is not an issue.

Affected Products

PowerProtect Data Protection Appliance
Article Properties
Article Number: 000182705
Article Type: Solution
Last Modified: 05 Aug 2021
Version:  4
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