ttutun

ttutun is a label observed in some Apple-platform VPN configurations to refer to a virtual network interface used for tunneling traffic. It is not an officially defined standard; the exact interface name is determined by the VPN software and the underlying OS networking APIs. On macOS and iOS VPNs often create a tun-like interface to carry encapsulated packets. The interface is created in user space or by a system framework (for example, via Network Extension) and is connected to the VPN gateway. The traffic through the device is controlled by IP routing and firewall rules; IP addresses and routes are assigned to the interface to direct specific traffic through the tunnel (for example, traffic bound for corporate networks or private networks). The interface name might appear as 'ttutunx' or as a more generic 'utun' device depending on the implementation. The lifetime of the interface is tied to the VPN session; it is removed when the VPN disconnects. Troubleshooting typically involves verifying that the VPN session is active, that the appropriate interface is up, and that routes are configured correctly. Common diagnostic steps include listing interfaces, checking the interface's IP, and confirming that traffic reaches the VPN gateway.