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Split tunneling with a VPN

One of my customers is using Windows 2003 VPN RAS. The problem is that the VPN client cannot connect to the Internet.

One of my customers is using Windows 2003 VPN RAS. The client connects to the RAS and authenticates. The customer can ping all internal addresses but cannot ping Internet addresses or connect to the Internet. The client is using DHCP from a server which uses DHCP pool. The customer uses a proxy connection and this is set on the client VPN connection. The problem is that the VPN client cannot connect to the Internet.

Accessing a remote network through a VPN while accessing the Internet at the same time is known as split tunneling. This can be a security problem because 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.

There are several ways of solving this problem, but the easiest is for the remote network to provide Internet access through its routers. See the excellent discussion of split tunneling and ways to deal with it in this Microsoft TechNet Cable Guy column for further information.

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