While the usage of IPSec based VPNs for the construction and maintenance of a mobile VPN is feasible, issues related to its scalability in terms of required resources and QoS provisioning limit its practical deployment. The research work in this area explores the usage of a MPLS over GRE (MoGRE) based VPN architecture to construct a mobile VPN that would provide scalable, yet secure connections between the mobile networks and their corresponding home networks.

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