[AI] Split Tunneling

Tech dose of the day vishnuhappy at yahoo.com
Thu Jun 26 04:54:15 EDT 2008

Split Tunneling
Dosed by Shivaraj – M & E Team (from MphasiS Software Services)
What is Split Tunneling?
Accessing a remote network through a VPN (Virtual Private Network) while accessing the Internet at the same time is known as Split Tunneling. It is the term used to describe a multiple-branch networking path. A tunnel is split when some network traffic is sent to the VPN server and other traffic is sent directly to the remote location without passing through the VPN server.  It allows a VPN user to access both public network as well as local network at the same time.
What decides whether traffic is sent to the VPN server or straight to its destination?
The VPN server tells the client whether split tunneling is implemented for the client's active profile and, if so, what traffic to tunnel. This determination is made based on client type and configuration and the IP number of the traffic's destination.
An advantage of using split tunneling is that it alleviates bottlenecks and conserves bandwidth as Internet traffic does not have to pass through the VPN server. The drawback of this method is, it opens the possibility of an attacker gaining access to the remote network through the VPN client. For this reason, recent versions of Windows have default settings that prohibit concurrent access to a VPN and the Internet.
Further References

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