# SCNetworkInterfaceCopyMTU(_:_:_:_:) Returns the current MTU setting and the range of allowable values for the specified network interface. ``` func SCNetworkInterfaceCopyMTU(_ interface: SCNetworkInterface, _ mtu_cur: UnsafeMutablePointer?, _ mtu_min: UnsafeMutablePointer?, _ mtu_max: UnsafeMutablePointer?) -> Bool ``` ## Parameters `interface` The network interface. `mtu_cur` On output, the current MTU setting for the interface. `mtu_min` On output, the minimum MTU setting for the interface. If negative, the minimum setting could not be determined. `mtu_max` On output, the maximum MTU setting for the interface. If negative, the maximum setting could not be determined. ## Return Value `TRUE` if the requested information has been returned. ## Discussion --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)