用于删除现有DNS条目并在NIC卡上的备用首选DNS上设置新条目的PowerShell脚本

# 删除现有DNS条目
Get-DnsClientServerAddress | Where-Object {$_.AddressFamily -eq "IPv4"} | ForEach-Object {
    $dnsServers = $_.ServerAddresses
    $dnsServers | ForEach-Object {
        $dnsServer = $_
        Write-Host "正在删除DNS服务器地址 $dnsServer"
        Set-DnsClientServerAddress -InterfaceIndex $_.InterfaceIndex -ServerAddresses @($dnsServer) -PassThru | ForEach-Object {
            if ($_.ServerAddresses -notcontains $dnsServer) {
                Write-Host "成功删除DNS服务器地址 $dnsServer"
            } else {
                Write-Host "无法删除DNS服务器地址 $dnsServer"
            }
        }
    }
}

# 在NIC卡上的备用首选DNS上设置新条目
$nic = Get-NetAdapter | Where-Object {$_.Status -eq "Up"} | Select-Object -First 1
$dnsServer = "新的DNS服务器地址"
Write-Host "正在设置DNS服务器地址 $dnsServer"
Set-DnsClientServerAddress -InterfaceIndex $nic.InterfaceIndex -ServerAddresses @($dnsServer) -PassThru | ForEach-Object {
    if ($_.ServerAddresses -contains $dnsServer) {
        Write-Host "成功设置DNS服务器地址 $dnsServer"
    } else {
        Write-Host "无法设置DNS服务器地址 $dnsServer"
    }
}