Set a static address on a specific interface with specific ip string prefix

set-mgmnt-dhcp-client.ps1

# Variables
$ipStringPrefix = "192.20.20." # Replace with the desired IP address prefix

$newIpAddress = "192.20.20.150" # Replace with the desired new static IP address
$newPrefixLength = 24 # Replace with the desired subnet mask length

# Find the interface by CIDR
$interfaces = Get-NetIPAddress | Where-Object { 
    $_.IPAddress.StartsWith($ipStringPrefix)
}

if ($interfaces -and $interfaces.Count -gt 0) {
    $interfaceName = $interfaces[0].InterfaceAlias
    Write-Output "Found interface: $interfaceName"
  
    # Remove existing IP address configuration to avoid conflicts
    $interfaces | ForEach-Object {
        Remove-NetIPAddress -InterfaceAlias $interfaceName -IPAddress $_.IPAddress -Confirm:$false
    }
    
    # Reset the interface to use DHCP for both IP and DNS
    Set-NetIPInterface -InterfaceAlias $interfaceName -Dhcp Enabled
    Set-DnsClientServerAddress -InterfaceAlias $interfaceName -ResetServerAddresses
    
    Write-Output "DHCP CLient set on interface $interfaceName"
} else {
    Write-Output "No interface found with prefix $ipStringPrefix"
}

set-mgmnt-static-ip.ps1

# Variables
$ipStringPrefix = "192.20.20." # Replace with the desired IP address prefix

$newIpAddress = "192.20.20.150" # Replace with the desired new static IP address
$newPrefixLength = 24 # Replace with the desired subnet mask length

# Find the interface by CIDR
$interfaces = Get-NetIPAddress | Where-Object { 
    $_.IPAddress.StartsWith($ipStringPrefix)
}

if ($interfaces -and $interfaces.Count -gt 0) {
    $interfaceName = $interfaces[0].InterfaceAlias
    Write-Output "Found interface: $interfaceName"
  
    # Remove existing IP address configuration to avoid conflicts
    $interfaces | ForEach-Object {
        Remove-NetIPAddress -InterfaceAlias $interfaceName -IPAddress $_.IPAddress -Confirm:$false
    }
    
    # Reset the interface to use DHCP for both IP and DNS
    Set-NetIPInterface -InterfaceAlias $interfaceName -Dhcp Enabled
    Set-DnsClientServerAddress -InterfaceAlias $interfaceName -ResetServerAddresses
    
    # Set static IP address without a default gateway
    New-NetIPAddress -InterfaceAlias $interfaceName -IPAddress $newIpAddress -PrefixLength $newPrefixLength

    # Configure DNS servers
#    Set-DnsClientServerAddress -InterfaceAlias $interfaceName -ServerAddresses $dnsServers

    Write-Output "Static IP address $newIpAddress/$newPrefixLength set on interface $interfaceName with DNS servers $($dnsServers -join ', ')"
} else {
    Write-Output "No interface found with prefix $ipStringPrefix"
}