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# NEIPv6Settings

The IPv6 settings of an IP layer network tunnel.

```
class NEIPv6Settings
```

## Overview

To specify the IPv6 settings of a packet tunnel, set its [`NEPacketTunnelNetworkSettings`](/documentation/NetworkExtension/NEPacketTunnelNetworkSettings).[`ipv6Settings`](/documentation/NetworkExtension/NEPacketTunnelNetworkSettings/ipv6Settings) property to an instance of this class.

## Topics

### Initializing IPv6 settings

[`init(addresses:networkPrefixLengths:)`](/documentation/NetworkExtension/NEIPv6Settings/init(addresses:networkPrefixLengths:))

Initializes the IPv6 settings object.

### Accessing IPv6 properties

[`addresses`](/documentation/NetworkExtension/NEIPv6Settings/addresses)

The IPv6 addresses to assign to the TUN interface.

[`networkPrefixLengths`](/documentation/NetworkExtension/NEIPv6Settings/networkPrefixLengths)

The IPv6 network prefix lengths to assign to the TUN interface.

### Routing network traffic

[`includedRoutes`](/documentation/NetworkExtension/NEIPv6Settings/includedRoutes)

The IPv6 network traffic that the system routes to the TUN interface.

[`excludedRoutes`](/documentation/NetworkExtension/NEIPv6Settings/excludedRoutes)

The IPv6 network traffic that the system routes to the primary physical interface, not the TUN interface.

[`NEIPv6Route`](/documentation/NetworkExtension/NEIPv6Route)

The settings for an IPv6 route.


---

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