[Bug 1812748] [NEW] netplan.io's secondary IP address feature causes snmpd errors

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netplan doesn't provide for interface aliases (for example: eth0:0),
however, assigning two IP addresses to an interface the way netplan does
causes snmpd to produce numerous "error on subcontainer 'ia_addr' insert
(-1)" entries in syslog reported by snmpd.  This should'nt happen and is
either a problem with snmpd or netplan.  This also occurs on non-netplan
systems (for example, Ubuntu 16.04 using keepalived) when a secondary IP
address is added without making it an alias.  Ubuntu 16.04 systems using
interface aliases do not experience this problem.  If needed, I can
supply information from the Ubuntu 16.04 systems.

apt-cache policy netplan.io
netplan.io:
  Installed: 0.40.1~18.04.4
  Candidate: 0.40.1~18.04.4
  Version table:
 *** 0.40.1~18.04.4 500
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu bionic-security/main amd64 Packages
        100 /var/lib/dpkg/status
     0.36.1 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages

apt-cache policy snmpd
snmpd:
  Installed: 5.7.3+dfsg-1.8ubuntu3.1
  Candidate: 5.7.3+dfsg-1.8ubuntu3.1
  Version table:
 *** 5.7.3+dfsg-1.8ubuntu3.1 500
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu bionic-security/main amd64 Packages
        100 /var/lib/dpkg/status
     5.7.3+dfsg-1.8ubuntu3 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages

** Affects: netplan.io (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: address ip secondary snmpd
-- 
netplan.io's secondary IP address feature causes snmpd errors
https://bugs.launchpad.net/bugs/1812748
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