Duplicate IP | SNMP Duplicate IPv4 Adress Detected

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  • Updated 10 months ago
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When starting the snmpd service I can see the following in the syslog:
Duplicate IPv4 address detected, some interfaces may not be visible in IP-MIB

I have searched high and low for a solution but unable to find anything particularly helpful. Most articles found are based around a small network where you are likely to have an idea already of what the duplicate ip may be.

What is the most effective way to find a duplicate IP with Cumulus Linux?

I understand you can use arp and grep like so:
arp -an | grep

By comparing the output you can see if the MAC address differs. In this instance again you would need to have some kind of inkling of which IP is duplicated.

I have tried using arping, again this requires some inkling as to the duplicated IP: This is also not the easiest to use with the management VRF enabled and requires you to specify the source address/interface, which causes complications when scripting.

I have tested using:
arp -a

I extract the ip/mac pairs from the results and compare these for duplicates, I am not finding anything.

I have also tried to do an SNMP walk and again extracted the ip/mac pairs, again I am not seeing anything duplicated.

Are there any other tools that would be useful to identify the issue?
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Jon H

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Posted 10 months ago

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Eric Pulvino, Official Rep

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This "error" can most likely be ignored; it has to do with how snmp indexes interfaces....when they change.....it gets confused. Is SNMP otherwise functioning as expected? Can you post your /etc/snmp/snmpd.conf file and maybe your /etc/network/interfaces?