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I have a single network interface on this server named enp2s0 This interface had a static address 192.168.2.xxx with gateway 192.168.2.1 Now I changed the static address in yaml file to 192.168.1.xxx and the gateway too in 192.168.1.1 but every time I restart the server the default gateway comes back to 192.168.2.1 I tried to launch route commmand to remove default gateway and set the new one but if I restart the server it comes back to 192.168.2.1

This is the yaml config file

    # This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
  version: 2
  renderer: networkd
  ethernets:
        enp2s0:
            addresses: [192.168.1.10/24]
            gateway4: 192.168.1.1
            nameservers:
                addresses: [1.1.1.1,1.0.0.1]

Output of networkctl status enp2s0 after reboot

 2: enp2s0
       Link File: /lib/systemd/network/99-default.link
    Network File: /run/systemd/network/10-netplan-enp2s0.network
            Type: ether
           State: routable (configured)
            Path: pci-0000:02:00.0
          Driver: r8169
          Vendor: Realtek Semiconductor Co., Ltd.
           Model: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (M4A
      HW Address: 48:5b:39:02:41:c9 (ASUSTek COMPUTER INC.)
         Address: 192.168.1.10
                  192.168.2.100
                  fe80::4a5b:39ff:fe02:41c9
         Gateway: 192.168.2.1
             DNS: 1.1.1.1
                  1.0.0.1

Output of route command after reboot

Tabella di routing IP del kernel
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.2.1     0.0.0.0         UG    202    0        0 enp2s0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 enp2s0
192.168.2.0     0.0.0.0         255.255.255.0   U     202    0        0 enp2s0

Result of networkctl status enp2s0 after restored default gateway to 192.168.1.1

 2: enp2s0
       Link File: /lib/systemd/network/99-default.link
    Network File: /run/systemd/network/10-netplan-enp2s0.network
            Type: ether
           State: routable (configured)
            Path: pci-0000:02:00.0
          Driver: r8169
          Vendor: Realtek Semiconductor Co., Ltd.
           Model: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (M4A
      HW Address: 48:5b:39:02:41:c9 (ASUSTek COMPUTER INC.)
         Address: 192.168.1.10
                  fe80::4a5b:39ff:fe02:41c9
         Gateway: 192.168.1.1
             DNS: 1.1.1.1
                  1.0.0.1

Output of route command after restored default gateway to 192.168.1.1

Tabella di routing IP del kernel
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.1.1     0.0.0.0         UG    0      0        0 enp2s0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 enp2s0

This is the output of netplan --debug apply command

 ** (generate:4965): DEBUG: 16:17:35.743: Processing input file /etc/netplan/01-netcfg.yaml..
** (generate:4965): DEBUG: 16:17:35.744: starting new processing pass
** (generate:4965): DEBUG: 16:17:35.744: Processing input file /etc/netplan/lo.yaml..
** (generate:4965): DEBUG: 16:17:35.744: starting new processing pass
** (generate:4965): DEBUG: 16:17:35.744: enp2s0: setting default backend to 1
** (generate:4965): DEBUG: 16:17:35.744: Configuration is valid
** (generate:4965): DEBUG: 16:17:35.744: lo: setting default backend to 1
** (generate:4965): DEBUG: 16:17:35.744: Configuration is valid
** (generate:4965): DEBUG: 16:17:35.744: Generating output files..
** (generate:4965): DEBUG: 16:17:35.744: NetworkManager: definition enp2s0 is not for us (backend 1)
** (generate:4965): DEBUG: 16:17:35.744: NetworkManager: definition lo is not for us (backend 1)
DEBUG:netplan generated networkd configuration changed, restarting networkd
DEBUG:no netplan generated NM configuration exists
DEBUG:enp2s0 not found in {}
DEBUG:lo not found in {'enp2s0': {'addresses': ['192.168.1.10/24'], 'gateway4': '192.168.1.1', 'nameservers': {'addresses': ['1.1.1.1', '1.0.0.1']}}}
DEBUG:Merged config:
network:
  bonds: {}
  bridges: {}
  ethernets:
    enp2s0:
      addresses:
      - 192.168.1.10/24
      gateway4: 192.168.1.1
      nameservers:
        addresses:
        - 1.1.1.1
        - 1.0.0.1
    lo:
      addresses:
      - 127.0.0.1/8
  vlans: {}
  wifis: {}

DEBUG:device lo operstate is unknown, not changing
DEBUG:device enp2s0 operstate is up, not changing
DEBUG:{}
DEBUG:netplan triggering .link rules for lo
DEBUG:netplan triggering .link rules for enp2s0

@heynnema

root@ubuntu:~# cat /etc/network/interfaces
# ifupdown has been replaced by netplan(5) on this system.  See
# /etc/netplan for current configuration.
# To re-enable ifupdown on this system, you can run:
#    sudo apt install ifupdown
root@ubuntu:~# cat /etc/netplan/*.yaml
# This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
  version: 2
  renderer: networkd
  ethernets:
        enp2s0:
            addresses: [192.168.1.10/24]
            gateway4: 192.168.1.1
            nameservers:
                addresses: [1.1.1.1,1.0.0.1]
network:
    ethernets:
        lo:
            addresses: ['127.0.0.1/8']

How to solve ?

  • Edit your question and show me cat /etc/network/interfaces and cat /etc/netplan/*.yaml. Start comments to me with @heynnema or I may miss them. – heynnema Nov 19 at 22:28
  • @heynnema edited with the output you need – Stefano Nov 20 at 12:28
  • I put together an initial answer for you. If it solves your problem, please remember to accept it by clicking the checkmark icon just to the left of my answer. Also click the up arrow icon for me. Thanks! – heynnema Nov 20 at 15:23
  • status please... – heynnema Nov 22 at 14:41
0

After a brief review...

Change your /etc/netplan/*.yaml file... and be aware of the specific indentation, and assure no tabs...

from:

# This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
  version: 2
  renderer: networkd
  ethernets:
        enp2s0:
            addresses: [192.168.1.10/24]
            gateway4: 192.168.1.1
            nameservers:
                addresses: [1.1.1.1,1.0.0.1]
network:
    ethernets:
        lo:
            addresses: ['127.0.0.1/8']

to:

# This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
  version: 2
  renderer: networkd
  ethernets:
    enp2s0:
      addresses: [192.168.1.10/24]
      gateway4: 192.168.1.1
      nameservers:
        addresses: [1.1.1.1,1.0.0.1]

sudo netplan --debug generate # generate config files

sudo netplan apply # apply new config

reboot # mandatory reboot

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