Policy-based filtering, a form of packet filtering, controls access to designated sites or services on the enterprise network. You will immediately find yourself facing a choice between two kinds of VPNs that differ in the degree to which they outsource. The list of advantages and disadvantages that follows will help you determine which system fits your needs. But it may help to read through the entire checklist before making that assessment. Each time a remote user seeks access, the ISP authenticates that the user should have access to the VPN and then creates the tunnel to a remote VPN server on the user's enterprise network.
Users often see nearly the same interface as when dialing up remotely.
They do not need to learn about additional technology. A business can contract with an ISP that guarantees port availability and performance. An ISP can easily scale to meet its customers' needs. Disadvantages Security Outsourced security can be difficult to use or inflexible. The ISP controls remote access to the network.