First of all thanks to: gderf, ryecoaaron, gandalf1203 because of your posts I was able to install a 2nd NIC into OMV and get all the config errors cleaned up and the NIC is running.
BUT... the /etc/network/interfaces vs. GUI config are not matched. Everything works, even after a reboot, but I'm wondering how I can cleanup the GUI so that it matches the actual config.
here is /etc/network/interfaces:
(and for the record, enp2s0 could now be deleted, it's the onboard 100mb NIC)
# Include additional interface stanzas.
source-directory interfaces.d
# The loopback network interface
auto lo
iface lo inet loopback
# enp2s0 network interface
auto enp2s0
allow-hotplug enp2s0
iface enp2s0 inet static
address 192.168.1.2
netmask 255.255.255.0
dns-nameservers 192.168.1.3
dns-search nisi.local
iface enp2s0 inet6 manual
pre-down ip -6 addr flush dev $IFACE
# enp3s0 network interface
auto enp3s0
allow-hotplug enp3s0
iface enp3s0 inet static
address 192.168.243.2
gateway 192.168.243.254
netmask 255.255.255.0
dns-nameservers 192.168.243.3
dns-search nisi.local
iface enp3s0 inet6 manual
pre-down ip -6 addr flush dev $IFACE
See attached SNIP from GUI config of OMV.
Like I said, this all works, but I am concerned that one day the system will get confused and the NIC's will stop working.
TIA,
Scott.