---
title: "peerAuthentication(_:)"
framework: Network
role: symbol
role_heading: Instance Method
platforms: [iOS 27.0+, iPadOS 27.0+, Mac Catalyst 27.0+, macOS 27.0+, tvOS 27.0+, visionOS 27.0+, watchOS 27.0+]
path: "network/dtls/peerauthentication(_:)"
---

# peerAuthentication(_:)

Specify a preference for how to authenticate the peer.

## Declaration

```swift
func peerAuthentication(_ preference: DTLS.PeerAuthentication) -> DTLS
```

## Parameters

- `preference`: The peer authentication preference.