Mobile clients can execute IPv6 applications in an IPv4 environment without the need for any specialized IPv6 hardware or upgrades to the network infrastructure. The architecture provides a seamless, disruption-free connectivity experience for mobile clients. Mobile clients are automatically connected to other mobile clients irrespective of their network connectively, whether wireless, wire line, IPv4, IPv6, public or private. Mobile clients communicate with other mobile clients using a secure, end-to-end IPv6 tunnel. This creates a persistent VPN connection between two clients using software.