NetworkManager or systemd-resolvd not creating routes until after a two minute delay

[oshunluvr]

I've had some networking issues and solved one of them by returning to NetworkManager as the renderer instead of networkd. This is ubuntu server so no GUI.

After finally getting everything working, I have on problem left; when I reboot, the network has no routes;

$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

I can solve it temporarily by restarting NetworkManager which gets this:

$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.0.0     0.0.0.0         255.255.254.0   U     100    0        0 eno1

and then finally adding the default route by entering:

sudo route add default gw 192.168.1.1 eno1

$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 eno1
192.168.0.0     0.0.0.0         255.255.254.0   U     100    0        0 eno1

Well, I fiddled with this four a couple hours, then once, after a reboot by no interaction from me, the routes appeared after about 2 minutes! The syslog reveals this:

Dec 17 14:48:09 server NetworkManager[1071]: <info>  [1608234489.8725] device (eno1): scheduling DHCPv4 restart in 120 seconds, 3 tries left (reason: lease expired)

which totally explains the delay, but doesn't explain why.

However, I believe it may be because there are two other network devices - one wired, one wifi - which are not being used. After ta while the syslog starts to fill with:

Dec 17 15:10:26 server NetworkManager[1071]: <warn>  [1608235826.7750] error requesting auth for org.freedesktop.NetworkManager.enable-disable-statistics: Authorization check failed: Failed to open file “/proc/4167/status”: No such file or directoryDec 17 15:10:26 server NetworkManager[1071]: <warn>  [1608235826.7753] error requesting auth for org.freedesktop.NetworkManager.enable-disable-connectivity-check: Authorization check failed: Failed to open file “/proc/4167/status”: No such file or directory
Dec 17 15:10:27 server dhclient[2235]: DHCPDISCOVER on enp2s0 to 255.255.255.255 port 67 interval 10 (xid=0x63e2be55)
Dec 17 15:10:36 server dhclient[2235]: DHCPDISCOVER on wlp3s0 to 255.255.255.255 port 67 interval 17 (xid=0x60100c3a)
Dec 17 15:10:37 server dhclient[2235]: DHCPDISCOVER on enp2s0 to 255.255.255.255 port 67 interval 16 (xid=0x63e2be55)

repeated every couple minutes. These two devices aren't connected to anything but clearly are taking time from my system.

I'm still searching the web for answers

[oshunluvr]

I tried this in netplan with no change:

[FONT=monospace][COLOR=#000000]      dhcp4: no[/COLOR]
      dhcp4-overrides:
        use-dns: false
      dhcp6: no
      dhcp6-overrides:
        use-dns: false

[/FONT]