ABSTRACT
Wide acceptance of security standards in IP and deployment of quality-ofservice (QoS) mechanisms like Differentiated Services (DiffServ) and Resource Reservation Protocol (RSVP) within multi-protocol label switching (MPLS) is increasing the feasibility of virtual private networks (VPNs). VPNs are now considered mainstream; most service providers include some type of VPN service in their offerings, and IT professionals have grown familiar with the technology. Also, with the growth of broadband, more companies are using VPNs for remote access and telecommuting. Specifically, the small office/home-office market has the largest growth projections according to industry analysts. However, where once lay the promise of IPSec-based VPNs, it is now accepted that IPSec does not solve all remote access VPN problems.
