Netplan does not allow greater that 8 nics to be configured

[Andrew Welham]

there is no crash or app report available
when you try to configure more than 8 nics netplan gives the following error and only configures the first 8

DEBUG:netplan generated networkd configuration exists, restarting networkd
DEBUG:no netplan generated NM configuration exists
DEBUG:device enp0s17 operstate is up, not replugging
DEBUG:netplan triggering .link rules for enp0s17
DEBUG:device enp0s8 operstate is up, not replugging
DEBUG:netplan triggering .link rules for enp0s8
DEBUG:device enp0s18 operstate is up, not replugging
DEBUG:netplan triggering .link rules for enp0s18
DEBUG:device enp0s16 operstate is up, not replugging
DEBUG:netplan triggering .link rules for enp0s16
DEBUG:device enp0s9 operstate is up, not replugging
DEBUG:netplan triggering .link rules for enp0s9
DEBUG:device lo operstate is unknown, not replugging
DEBUG:netplan triggering .link rules for lo
DEBUG:device enp0s10 operstate is up, not replugging
DEBUG:netplan triggering .link rules for enp0s10
DEBUG:device enp0s3 operstate is up, not replugging
DEBUG:netplan triggering .link rules for enp0s3
DEBUG:replug enp2s0: unbinding 0000:02:00.0 from /sys/bus/pci/drivers/e1000
DEBUG:replug enp2s0: rebinding 0000:02:00.0 to /sys/bus/pci/drivers/e1000
DEBUG:device enp0s19 operstate is up, not replugging

looking in the drivers directory you can see ni9 is on a different address
# ls -als /sys/bus/pci/drivers/e1000
total 0
0 drwxr-xr-x 2 root root 0 Jan 27 13:12 .
0 drwxr-xr-x 27 root root 0 Jan 27 13:02 ..
0 lrwxrwxrwx 1 root root 0 Jan 27 13:11 0000:00:03.0 -> ../../../../devices/pci0000:00/0000:00:03.0
0 lrwxrwxrwx 1 root root 0 Jan 27 13:11 0000:00:08.0 -> ../../../../devices/pci0000:00/0000:00:08.0
0 lrwxrwxrwx 1 root root 0 Jan 27 13:11 0000:00:09.0 -> ../../../../devices/pci0000:00/0000:00:09.0
0 lrwxrwxrwx 1 root root 0 Jan 27 13:11 0000:00:0a.0 -> ../../../../devices/pci0000:00/0000:00:0a.0
0 lrwxrwxrwx 1 root root 0 Jan 27 13:11 0000:00:10.0 -> ../../../../devices/pci0000:00/0000:00:10.0
0 lrwxrwxrwx 1 root root 0 Jan 27 13:11 0000:00:11.0 -> ../../../../devices/pci0000:00/0000:00:11.0
0 lrwxrwxrwx 1 root root 0 Jan 27 13:11 0000:00:12.0 -> ../../../../devices/pci0000:00/0000:00:12.0
0 lrwxrwxrwx 1 root root 0 Jan 27 13:11 0000:00:13.0 -> ../../../../devices/pci0000:00/0000:00:13.0
0 lrwxrwxrwx 1 root root 0 Jan 27 13:11 0000:02:00.0 -> ../../../../devices/pci0000:00/0000:00:19.0/0000:02:00.0

This has been found in ALpha 1 & 2 for desktop and Alpha 2 for server.
if the 9th nic is bought up manually using ifconfig it works

my netlan config file
# This file describes the network interfaces available on your system# For more information, see netplan(5).
network:
 version: 2
 renderer: networkd
 ethernets:
   enp0s3:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.0.3/24]
     gateway4: 192.168.0.1
     nameservers:
         addresses: [dnsserver1,dnsserver2]
   enp0s8:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.1.3/24]
     gateway4: 192.168.1.1
     nameservers:
         addresses: [dnsserver1,dnsserver2]
   enp0s9:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.2.3/24]
     nameservers:
         addresses: [dnsserver1,dnsserver2]
   enp0s10:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.3.3/24]
     nameservers:
         addresses: [dnsserver1,dnsserver2]
   enp0s16:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.4.3/24]
     nameservers:
         addresses: [dnsserver1,dnsserver2]
   enp0s17:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.5.3/24]
     nameservers:
         addresses: [dnsserver1,dnsserver2]
   enp0s18:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.6.3/24]
     nameservers:
         addresses: [dnsserver1,dnsserver2]
   enp0s19:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.7.3/24]
     nameservers:
         addresses: [dnsserver1,dnsserver2]
   enp2s0:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.8.3/24]
     nameservers:
         addresses: [dnsserver1,dnsserver2]

[Mathieu Trudel-Lapierre (cyphermox)]

There's no reason for anything in netplan to care what the device is numbered '9'; and it's not even the last interface configured in the yaml file. This smells like a systemd bug.

Could you please attach the file that netplan generates in /run/systemd/network, as well as /var/log/syslog to see if systemd-networkd reports any error?

Thanks!

[Andrew Welham (andreww-ubuntu)]

I had rebuild my test vm since then, so I have included the new yaml file, it appears as before to the enp2 interfaces.
Looking at the files in /run/systemd/network directory all look good. However there as a delayed boot while setting up the interfaces

I've attached a syslog whihc was cleared just before reboot

01-netcfg.yaml

network:
 version: 2
 renderer: networkd
 ethernets:
   enp0s3:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.0.150/24]
     nameservers:
         addresses: [192.168.0.3,192.168.0.15]
   enp0s8:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.1.150/24]
     nameservers:
         addresses: [192.168.1.2,192.168.1.3]
   enp0s9:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.2.150/24]
     nameservers:
         addresses: [192.168.2.2,192.168.2.3]
   enp0s10:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.3.150/24]
     nameservers:
         addresses: [192.168.3.2,192.168.3.3]
   enp0s16:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.4.150/24]
     nameservers:
         addresses: [192.168.4.2,192.168.4.3]
   enp0s17:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.5.150/24]
     nameservers:
         addresses: [192.168.5.2,192.168.5.3]
   enp0s18:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.6.150/24,192.168.7.2/24]
     nameservers:
         addresses: [192.168.6.2,192.168.7.3,192.168.6.3,192.168.7.2]
   enp0s19:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.253.150/24]
     gateway4: 192.168.253.1
     nameservers:
         addresses: [192.168.253.3,192.168.253.3]
   enp2s0:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.9.150/24]
     gateway4: 192.168.9.1
     nameservers:
         addresses: [192.168.253.3,192.168.253.1]
   enp2s1:
     dhcp4: no
     dhcp6: no
     addresses: [192.168.10.150/24]
     gateway4: 192.168.10.1
     nameservers:
         addresses: [192.168.253.3,192.168.253.3]

::::::::::::::
10-netplan-enp0s10.network
::::::::::::::
[Match]
Name=enp0s10

[Network]
Address=192.168.3.150/24
DNS=192.168.3.2
DNS=192.168.3.3
::::::::::::::
10-netplan-enp0s16.network
::::::::::::::
[Match]
Name=enp0s16

[Network]
Address=192.168.4.150/24
DNS=192.168.4.2
DNS=192.168.4.3
::::::::::::::
10-netplan-enp0s17.network
::::::::::::::
[Match]
Name=enp0s17

[Network]
Address=192.168.5.150/24
DNS=192.168.5.2
DNS=192.168.5.3
::::::::::::::
10-netplan-enp0s18.network
::::::::::::::
[Match]
Name=enp0s18

[Network]
Address=192.168.6.150/24
Address=192.168.7.2/24
DNS=192.168.6.2
DNS=192.168.7.3
DNS=192.168.6.3
DNS=192.168.7.2
::::::::::::::
10-netplan-enp0s19.network
::::::::::::::
[Match]
Name=enp0s19

[Network]
Address=192.168.253.150/24
Gateway=192.168.253.1
DNS=192.168.253.3
DNS=192.168.253.3
::::::::::::::
10-netplan-enp0s3.network
::::::::::::::
[Match]
Name=enp0s3

[Network]
Address=192.168.0.150/24
DNS=192.168.0.3
DNS=192.168.0.15
::::::::::::::
10-netplan-enp0s8.network
::::::::::::::
[Match]
Name=enp0s8

[Network]
Address=192.168.1.150/24
DNS=192.168.1.2
DNS=192.168.1.3
::::::::::::::
10-netplan-enp0s9.network
::::::::::::::
[Match]
Name=enp0s9

[Network]
Address=192.168.2.150/24
DNS=192.168.2.2
DNS=192.168.2.3
::::::::::::::
1...

[Launchpad Janitor (janitor)]

[Expired for nplan (Ubuntu) because there has been no activity for 60 days.]