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Change network settings on the server
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Change network settings on the server

Change network settings via Rescue⁠

  1. Boot the server in Rescue and Diagnostic mode.

  2. Mount the OS file system.

  3. Open the utility configuration file netplan word processor vi:

    vi /etc/netplan/01-netcfg.yaml

    or

    vi /etc/netplan/50-cloud-init.yaml

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

    The configuration file is written in tab- and space-sensitive YAML. Fill it in similarly to how it was filled in earlier.

    Example configuration file
    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]

    Here:

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

  5. Click ESC.

  6. Exit the text editor vi with the changes intact:

    :wq

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

    netplan --debug generate
    netplan apply

  8. В control panels go to Servers and hardware → Servers.

  9. Open the server page → tab Ports.

  10. In the Internet port bar, click .

  11. In the field VLAN replace the value General to the value of the allocated VLAN. You can view the VLAN of the allocated subnet in the control panels under Servers and hardware → Network → tab Subnetworks.

  12. Click Configure.

  13. Bring back the old server loading template or reboot the server from the OS. When you reboot the server from the OS, the boot template will automatically change to the one that was set before changes to the server load pattern.

Change network settings via WinPE⁠

Network settings can be restored if you in the network interface settings:

  • clicked on DHCP address acquisition;
  • configured the wrong IP address.

Restoring network settings to access Windows Server is done through the registry. Before making any changes, access the registry from WinPE and back up the partition where the system and registry files reside, typically the following C:\Windows\System32\config\SYSTEM.

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

  2. Open it up cmd.

  3. Output information about the settings of the network interfaces:

    ipconfig /all

  4. Memorize or copy the value of the field description for the right interface.

  5. Open it up Registry Editor:

    regedit

  6. Mount to a partition HKEY\_LOCAL\_MACHINE the branch with the system and registry files:

    6.1 Highlight a section HKEY\_LOCAL\_MACHINE.

    6.2 In the menu File select Load hive.

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

    6.4 Enter the name with which the loaded branch will be mounted to the partition HKEY\_LOCAL\_MACHINE, and press Open.

  7. In the mounted branch, locate the desired interface:

    7.1 Expand the registry section:

    HKEY_LOCAL_MACHINE\\\<branch_name>\ControlSet001\Control\Class\{4d36e972-e325-11ce-bfc1-08002be10318}

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

    The list will list the network interfaces from address 0000 before 0013.

    7.2 Find an interface that has a parameter value of Driver Desc specified description from step 4. Save the field value NetCfgInstanceId.

  8. Change the values of the interface parameters:

    8.1. Go to the registry section:

    HKEY_LOCAL_MACHINE\\\<branch_name>\ControlSet001\Services\Tcpip\Parameters\Interfaces\\\<net_cfg_instance_id>

    Specify:

    • <branch_name> — the branch name you entered in step 6.4;
    • <net_cfg_instance_id> — field value NetCfgInstanceIdthat you obtained in step 7.2.

    8.2 Edit the parameter values:

    • DefaultGateway;
    • IPAddress;
    • NameServer;
    • SubnetMask.
    • EnableDHCP — enter a value 0If you're not using DHCP, if you are. 1.

    The correct values can be viewed in control panels: under Servers and hardware → server page → tab Network → click the desired subnet.

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

  10. Bring back the old server loading template or reboot the server from the OS. When you reboot the server from the OS, the boot template will automatically change to the one that was set before changes to the server load pattern.