Change server from DHCP to static...

StaticIP.ps1

$adapter = Get-NetAdapter -Name "Ethernet"
$ipv4 =  $adapter | Get-NetIPAddress -AddressFamily IPv4

## Remove IPv6 Address and disable IPv6 binding....
$ipv6 =  $adapter | Get-NetIPAddress -AddressFamily IPv6 -ErrorAction SilentlyContinue
if ($ipv6) {
    $ipv6 | Remove-NetIPAddress -Confirm:$false
}
$binding = (Get-NetAdapterBinding | Where-Object { $_.ComponentID -eq "ms_tcpip6" })
if ($binding.Enabled) {
    Write-Host "Disabling IPv6 bindings..."
    $binding | Disable-NetAdapterBinding
}

$currentDHCPStatus = ($adapter | Get-NetIPInterface).Dhcp

if ($currentDHCPStatus -ne "Disabled") {
    #Set IPv4 to static...
    $dnsAddresses = (Get-DnsClientServerAddress | Where-Object { $_.AddressFamily -eq 2 -and $_.InterfaceAlias -eq "Ethernet" })[0].ServerAddresses

    $address = $ipv4.IPAddress
    $prefixLength = $ipv4.PrefixLength
    ##TODO: get current gateway from dhcp config...
    $defaultGateway = "1.2.3.4"

    $adapter | Set-NetIPInterface -Dhcp Disabled
    $adapter | New-NetIPAddress -IPAddress $address -PrefixLength $prefixLength  –DefaultGateway $defaultGateway

    Set-DnsClientServerAddress -InterfaceAlias "Ethernet" -ServerAddresses $dnsAddresses
}