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Split tunneling is a computer networking concept which allows a user to access dissimilar security domains like a public network (e.g., the Internet) and a local area network or wide area network at the same time, using the same or different network connections. This connection state is usually facilitated through the simultaneous use of a LAN network interface controller (NIC), radio NIC, Wireless LAN (WLAN) NIC, and VPN client software application without the benefit of an access control.
For example, suppose a user utilizes a remote access VPN software client connecting to a campus network using a hotel wireless network. The user with split tunneling enabled is able to connect to file servers, database servers, mail servers and other servers on the corporate network through the VPN connection. When the user connects to Internet resources (websites, FTP sites, etc.), the connection request goes directly out the gateway provided by the hotel network. However, not every VPN allows split tunneling. Some VPNs with split tunneling include Private Internet Access (PIA), ExpressVPN, Surfshark and NordVPN[1]
Split tunneling is sometimes categorized based on how it is configured. A split tunnel configured to only tunnel traffic destined to a specific set of destinations is called a split-include tunnel. When configured to accept all traffic except traffic destined to a specific set of destinations, it is called a split-exclude tunnel.[2][3][4]
^Long, Moe (July 22, 2021). "Best VPN for Split Tunneling". Tech Up Your Life. Retrieved October 21, 2021.
^Jeffery, Eric (June 19, 2020). "VPN Split-Tunneling – To Enable or Not To Enable". Infosecurity Magazine. Retrieved October 19, 2020.
^Mackie, Kurt (March 26, 2020). "Microsoft Touts Split Tunneling with VPNs To Support Remote Workers -- Redmondmag.com". Redmondmag. Retrieved October 19, 2020.
^Michael Cooney. "Cisco, others, shine a light on VPN split-tunneling". Network World. Retrieved October 19, 2020.
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