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The following figure illustrates the Mobile VPN system architecture.

MPLS and VPN Architectures

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MPLS and VPN Architectures - Cisco Press

Many enterprises are thinking of replacing traditional Layer 2 VPNs such as ATM or Frame Relay (FR) with MPLS-based services. As Multiprotocol Label Switching (MPLS) is becoming a more widespread technology for providing virtual private network (VPN) services, MPLS architecture security is of increasing concern to service providers (SPs) and VPN customers. This paper gives an overview of MPLS architecture security for both SPs and MPLS users, and compares it with traditional Layer 2 services from a security perspective. This paper also recommends how to secure an MPLS infrastructure. The focus is specifically on the MPLS/Border Gateway Protocol (BGP) VPN architecture.

The following diagram shows the VPN CloudHub architecture, with blue dashed lines indicating network traffic between remote sites being routed over their VPN connections.

Layer 3 VPN architectures - SearchEnterpriseWAN

MPLS and VPN Architectures, Volume 2
Jim Guichard,Ivan Pepelnjak,Jeff Apcar
Limited preview - 2003

OSI Layer 3 PPVPN architectures

Before delving into the details of the various operation modes, one must look into the flow of events required to get an SSLVPN workstation connected to the server. This connection should be done in such a way that it can transmit data to the non HTTP application it is protecting. The diagram below shows a basic SSLVPN architecture where the SSLVPN server is running on its own hardware platform, with a non HTTP based application sitting behind it. In order to access this non- HTTP application from the SSLVPN client, the following steps need to take place.

Before delving into the details of the various operation modes, one must look into the flow of events required to get an SSLVPN workstation connected to the server. This connection should be done in such a way that it can transmit data to the non HTTP application it is protecting. The diagram below shows a basic SSLVPN architecture where the SSLVPN server is running on its own hardware platform, with a non HTTP based application sitting behind it. In order to access this non- HTTP application from the SSLVPN client, the following steps need to take place.