Split Tunneling and Traffic Management

Split tunneling is a VPN feature that allows you to select which network traffic is routed through the VPN tunnel and which traffic uses your regular internet connection. With split tunneling enabled, only specific applications, IP addresses, or types of traffic are sent securely through the VPN, while the rest bypasses the VPN and accesses the internet directly. This selective routing can be configured based on security requirements or performance needs.

While split tunneling can improve speed and reduce bandwidth usage by allowing non-sensitive traffic to bypass the VPN, it also introduces security risks. If some traffic leaves your device outside the VPN tunnel, it is not protected by encryption or the VPN's privacy features. This can lead to data leakage, making your device or network more vulnerable to attacks. Use split tunneling only when necessary, such as to access local network resources or improve performance for trusted activities, and avoid it when handling sensitive information or in high-risk environments.

# Example OpenVPN client configuration for split tunneling

# Prevents OpenVPN from automatically routing all traffic through the VPN
route-nopull

# Only routes traffic destined for the 10.0.0.0/24 network through the VPN
route 10.0.0.0 255.255.255.0

In this OpenVPN configuration, the route-nopull directive stops the VPN from redirecting all your internet traffic through the tunnel. The route 10.0.0.0 255.255.255.0 line then specifies that only traffic destined for the 10.0.0.0/24 subnet will use the VPN. All other traffic will take the default route outside the VPN, effectively implementing split tunneling for that specific network segment.