Thanks mate.
I followed your steps and I confirm that all the 12 NICs work fine but not through NetworkManager.
Given that I only need one IP address for the main ethernet port (eth0), and the rest could have ANY value as I will be using them with GNS3 to connect virtual routers to real switches, I'm quite happy with the setup.
I ran into an issue accessing the internet, but this was fixed after I removed the gateway options from all other ethernet ports.
Code:
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 10.0.0.10
gateway 10.0.0.1
netmask 255.255.255.0
network 10.0.0.0
broadcast 10.0.0.255
dns-nameservers 10.0.0.1
auto eth1
iface eth1 inet static
address 10.1.1.1
#gateway 10.1.1.254
netmask 255.255.255.0
auto eth2
iface eth2 inet static
address 10.1.2.1
#gateway 10.1.2.254
netmask 255.255.255.0
auto eth3
iface eth3 inet static
address 10.1.3.1
#gateway 10.1.3.254
netmask 255.255.255.0
auto eth4
iface eth4 inet static
address 10.1.4.1
#gateway 10.1.4.254
netmask 255.255.255.0
auto eth5
iface eth5 inet static
address 10.1.5.1
#gateway 10.1.5.254
netmask 255.255.255.0
auto eth6
iface eth6 inet static
address 10.1.6.1
#gateway 10.1.6.254
netmask 255.255.255.0
auto eth7
iface eth7 inet static
address 10.1.7.1
#gateway 10.1.7.254
netmask 255.255.255.0
auto eth8
iface eth8 inet static
address 10.1.8.1
#gateway 10.1.8.254
netmask 255.255.255.0
auto eth9
iface eth9 inet static
address 10.1.9.1
#gateway 10.1.9.254
netmask 255.255.255.0
auto eth10
iface eth10 inet static
address 10.1.10.1
#gateway 10.1.10.254
netmask 255.255.255.0
auto eth11
iface eth11 inet static
address 10.1.11.1
#gateway 10.1.11.254
netmask 255.255.255.0
auto eth12
iface eth12 inet static
address 10.1.12.1
#gateway 10.1.12.254
netmask 255.255.255.0
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