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Change network settings on a dedicated server

Change network settings via Rescue

  1. Boot the server in Rescue recovery and diagnostic mode.

  2. Mount the OS file system.

  3. Open the netplan configuration file using the text editor vi:

    vi /etc/netplan/<netcfg>

    Specify <netcfg> — the name of the netplan utility configuration file, for example 50-cloud-init.yaml or 01-netcfg.yaml.

  4. For the required interface, change the values of addresses and gateway4 to the new IP address and gateway.

    The configuration file is written in YAML, which is sensitive to indentation and spaces. Fill it out by following the pattern used previously.

    Configuration file example
    network:
        version: 2
        renderer: networkd
        ethernets:
            eth0:
                dhcp4: no
                addresses: [178.132.202.35/28]
                gateway4: 178.132.202.33
                nameservers:
                    addresses: [188.93.16.19, 188.93.17.19]

    Where:

    • eth0 — network interface name;
    • addresses: [178.132.202.35/28] — server IP address with subnet mask;
    • gateway4: 178.132.202.33 — subnet gateway.

  5. Press ESC.

  6. Exit the vi text editor saving changes:

    :wq

  7. Check the configuration file for errors and apply the configuration:

    netplan --debug generate
    netplan apply

  8. In the control panel, in the top menu, click Products and select Dedicated Servers.

  9. In the Servers section, open the server page → Ports tab.

  10. In the internet port row, click .

  11. In the VLAN field, replace the value Shared with the dedicated VLAN value. You can view the dedicated subnet VLAN in the control panel: in the top menu, click Products → Dedicated Servers → Network → Subnets tab.

  12. Click Configure.

  13. Restore the previous server boot template or reboot the server from the OS. When rebooting the server from the OS, the boot template will automatically change to the one that was set before changing the server boot template.

Change network settings via WinPE

Network settings can be recovered if you did the following in the network interface settings:

  • clicked to obtain an address via DHCP;
  • configured an incorrect IP address.

Restoring network settings to access Windows Server is performed via the registry. Before making changes, access the registry from WinPE and create a backup of the partition where the system and registry files are located, usually C:\Windows\System32\config\SYSTEM.

  1. Boot the server in WinPE recovery and diagnostic mode.

  2. Open cmd.

  3. Output information about the network interface settings:

    ipconfig /all

  4. Remember or copy the value of the description field for the required interface.

  5. Open Registry Editor:

    regedit

  6. Mount the hive with the system and registry files to the HKEY_LOCAL_MACHINE key:

    6.1. Select the HKEY_LOCAL_MACHINE key.

    6.2. In the File menu, select Load hive.

    6.3. In the dialog box, select the directory where the system and registry files are located, usually C:\Windows\system32\config\SYSTEM.

    6.4. Enter the key name under which it will be mounted to HKEY_LOCAL_MACHINE, for example MountedSYSTEM. The hive name must not match existing keys in HKEY_LOCAL_MACHINE.

    6.5. Click Open. The registry hive will appear in the key.

  7. In the mounted branch, find the required network interface:

    7.1. Expand the network interfaces registry key:

    HKEY_LOCAL_MACHINE\<branch_name>\CurrentControlSet\Control\Class\{4d36e972-e325-11ce-bfc1-08002be10318}

    Specify <branch_name> — the hive name that you entered in step 6.4.

    The list will contain a list of network interfaces from address 0000 to 0013.

    7.2. Find the interface whose DriverDesc parameter value matches the description from step 4.

    7.3. Save the value of the NetCfgInstanceId field.

  8. Change the interface parameter values:

    8.1. Go to the registry key of the network interface you selected in step 7:

    HKEY_LOCAL_MACHINE\<branch_name>\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\<net_cfg_instance_id>

    Specify:

    • <branch_name> — hive name you entered in step 6.4;
    • <net_cfg_instance_id> — value of the NetCfgInstanceId field that you obtained in step 7.3.

    8.2. Edit the parameter values. You can view the correct values in the control panel: in the top menu, click Products → Dedicated Servers → server page → Network tab → click the required subnet.

    • DefaultGateway — default gateway;
    • IPAddress — IP address of the network interface;
    • NameServer — comma-separated IP addresses of DNS servers, for example 8.8.8.8, 8.8.4.4;
    • SubnetMask — subnet mask;
    • EnableDHCP — IP address acquisition mode, enter the value:
      • 0 — if you do not use DHCP;
      • 1 — if you use DHCP.

  9. Unload the hive: to do this, select it and in the File menu, select Unload hive.

  10. Restore the previous server boot template or reboot the server from the OS. When rebooting the server from the OS, the boot template will automatically change to the one that was set before changing the server boot template.