# Settings

> **Please note the customization and settings of mentioned options are optional and only recommended for certain scenarios, as it may affect the performance of the application during runtime.**

### Connection Options

`ConnectionOptions` allows you to adjust settings related to the connection manager:

* `Port`: Specifies the port for the local node. Default value is `9000` milliseconds 
* `IpAddress`: Indicates the IP address of the local machine on which the node is running
* `ReceiveTimeoutMs`: Specifies the timeout in milliseconds for receiving a response to a request message. Default value is `1000` milliseconds 
* `RequestTimeoutMs`: Specifies the timeout in milliseconds to remove pending messages for which a response has not been received. Default value is `2000` milliseconds 
* `CheckPendingRequestsDelayMs`: Specifies the time interval in milliseconds to check for pending messages. Default value is `500` milliseconds
* `RemoveCompletedRequestsDelayMs`: Specifies the time interval in milliseconds for the removal of completed requests. Default value is `1000` milliseconds

**Example**

```csharp
var connectionOptions = new ConnectionOptions()
                        .SetPort(9000)
                        .SetIpAddress(IPAddress.Parse("192.168.1.100"))
                        .SetReceiveTimeoutMs(1000)
                        .SetRequestTimeoutMs(2000)
                        .SetCheckPendingRequestsDelayMs(500)
                        .SetRemoveCompletedRequestsDelayMs(1000);
```

### Session Options

`SessionOptions` allows you to adjust settings related to the session manager:

* `Signer`: The signer for the identity scheme (v4 as per the [ENR](https://github.com/ethereum/devp2p/blob/master/enr.md#v4-identity-scheme) Specification)
* `Verifier`: The verifier for the identity scheme (v4 as per the [ENR](https://github.com/ethereum/devp2p/blob/master/enr.md#v4-identity-scheme) Specification)
* `SessionKeys`: The private keys used for securing the session
* `SessionCacheSize`: Specifies the size of the cache for storing session objects. Default value is `1000`

**Example**

```csharp
byte[] privateKey = ...; // Random 32 byte private key
ISessionKeys sessionKeys = new SessionKeys(privateKey);
IIdentitySchemeV4Signer signer = new IdentitySchemeV4Signer(privateKey);
IIdentitySchemeV4Verifier verifier = new IdentitySchemeV4Verifier();
SessionOptions sessionOptions = new()
                                .SetSigner(signer)
                                .SetVerifier(verifier)
                                .SetSessionKeys(sessionKeys)
                                .SetCacheSize(1500);
```

### Table Options

`TableOptions` allows you to configure the settings related to the node table manager:

* `PingIntervalMilliseconds`: Specifies the time interval in milliseconds at which ping messages are sent to active peers. Default value is `5000` 
* `RefreshIntervalMilliseconds`: Specifies the time interval in milliseconds at which the node table is refreshed by performing a lookup to ensure that the knowledge of active peers is up-to-date. Default value is `300000` 
* `LookupTimeoutMilliseconds`: Specifies the maximum time in milliseconds to perform a lookup operation. Default value is `10000` 
* `ConcurrencyParameter`: Specifies the concurrency factor (k) when performing lookups. This is the number of nodes that are queried each `FINDNODE` request during the lookup. Default value is `3`
* `LookupParallelism`: Specifies the maximum number of lookup operations (path buckets) that can be performed in parallel while maintaining the concurrency parameter (k). Default value is `2`.
* `MaxAllowedFailures`: Specifies the maximum number of allowed unsuccessful interaction attempts with a peer before it is considered as non-responsive and added to the blacklisting mechanism. Default value is `3`
* `BootstrapEnrs`: Specifies an array of ENRs (Ethereum Node Record)  for bootstrap peers.

```csharp
TableOptions tableOptions = new()
                            .SetPingIntervalMilliseconds(6000)
                            .SetRefreshIntervalMilliseconds(360000)
                            .SetLookupTimeoutMilliseconds(12000)
                            .SetMaxAllowedFailures(4)
                            .SetReplacementCacheSize(250)
                            .SetConcurrencyParameter(4)
                            .SetLookupParallelism(3)
                            .SetBootstrapEnrs(new string[] { "enr:...", "enr:..." });
```