# VPN Node DNS Configuration

The SDK allows you to change the DNS server used by the VPN node to resolve DNS requests. You can configure either a predefined DNS server provided by the backend or specify a custom DNS server URL.

## Option 1: Use Predefined DNS (From Backend API)

To use a predefined DNS server configured by the backend, follow these steps:

1. Fetch the available DNS server from the backend using `sdk.getBackend().locations`.
2. Pass the DNS value to the `withNodeDns()` method.

```kotlin
sdk.getBackend().locations(ConnectionType.HYDRA_TCP, new Callback<AvailableLocations>() {
   @Override
   public void success(@NonNull AvailableLocations availableLocations) {
      //availableLocations.getDnsServers()[0]
      //builder.withNodeDns(NodeDns.custom(dns.getName())
   }

   @Override
   public void failure(@NonNull VpnException e) {
   }
}); 
```

* `getDnsServers()`: Retrieves the list of available DNS servers from the backend.
* `withNodeDns(NodeDns.custom(dns))`: Configures the VPN node to use the DNS server retrieved from the backend.

## Option 2: Use a Custom User-Defined DNS

Alternatively, you can define a custom DNS URL and pass it to the `withNodeDns()` method:

```kotlin
builder.withNodeDns(NodeDns.user("https://user.url/dns")
```

* `NodeDns.user()`: Allows you to specify a user-defined DNS URL that will be used for DNS resolution on the VPN node.


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