So I run proxmox 2.1 (pve-manager/2.1/f9b0f63a). I monitor the servers with Dell’s OpenManage 6.5 and Nagios. I started noticing the following in my syslog (/var/log/syslog)

Jun 26 07:35:21 pveserver1 snmpd[2015]: error on subcontainer ‘ia_addr’ insert (-1)
Jun 26 07:35:21 pveserver1 snmpd[2015]: error on subcontainer ‘ia_addr’ insert (-1)
Jun 26 07:35:51 pveserver1 snmpd[2015]: error on subcontainer ‘ia_addr’ insert (-1)
Jun 26 07:35:51 pveserver1 snmpd[2015]: error on subcontainer ‘ia_addr’ insert (-1)

Quick check online points me to SNMP issues – apparently there is a “bug” that was fixed, but is still technically present due to the default settings of snmpd.

Login as root
nano /etc/default/snmpd
Change the line with SNMPDOPTS to
SNMPDOPTS='-LS6d -Lf /dev/null -u snmp -g snmp -I -smux -p /var/run/snmpd.pid'
And the line with TRAPDOPTS to
TRAPDOPTS='-LS6d -p /var/run/snmptrapd.pid'
Save and Exit

Then restart SNMPD
/etc/init.d/snmpd restart

Watch the log file and see if you receive any more snmpd messages
watch tail -45 /var/log/syslog