The Cisco IOS GETVPN is a tunnel-less VPN technology that provides end-to-end security for network traffic in a native mode and maintaining the fully meshed topology. IPsec VTIs simplify configuration of IPsec for protection of remote links, support multicast, and simplify network management and load balancing.ĭVTIs function like any other real interface so that you can apply quality of service (QoS), firewall, and other security services as soon as the tunnel is active. VTIs provide a routable interface type for terminating IPsec tunnels and an easy way to define protection between sites to form an overlay network. It enables zero-touch deployment of IPsec VPNs and improves network performance by reducing latency and jitter, while optimizing head office bandwidth utilization. It allows branch locations to communicate directly with each other over the public WAN or Internet, such as when using voice over IP (VOIP) between two branch offices, but doesn’t require a permanent VPN connection between sites. Dynamic Multipoint VPN (DMVPN)ĭynamic Multipoint VPN (DMVPN) is a Cisco IOS Software solution for building scalable IPsec Virtual Private Networks (VPNs). The crypto map statements need only one line permitting GRE (IP Protocol 47). With the p2p GRE over IPsec solution, all traffic between sites is encapsulated in a p2p GRE packet before the encryption process, simplifying the access control list used in the crypto map statements. Using GRE tunnels in conjunction with IPsec provides the ability to run a routing protocol, IP multicast (IPmc), or multiprotocol traffic across the network between the headend(s) and branch offices. Generic Route Encapsulation (GRE) is a protocol that can be used to “carry” other passenger protocols, such as IP broadcast or IP multicast, as well as non-IP protocols. IPsec also does not support the use of multiprotocol traffic. IPsec does not support IP broadcast or IP multicast, preventing the use of protocols that rely on these features, such as routing protocols. The Easy VPN Server: to act as a VPN headend deviceĪlthough IPsec provides a secure method for tunneling data across an IP network, it has limitations.The Easy VPN Remote: to act as a remote client. The Cisco Easy VPN solution helps integrate VPN remote devices within a single deployment and with a consistent policy and key management method, which simplifies remote site administration.Ĭisco Easy VPN consists of two components: Group Encrypted Transport VPN (GET VPN)Ĭisco Router and Security Device Manager (SDM) is an easy-to-use Internet browser-based device management tool that can configure this feature.In this article, I will explain a brief introduction of five VPN IPsec solutions that extend the capabilities of basic VPNs: Site-to-site VPNs: link two sites (headquarters, remote offices, branch offices, customers, partners, …) to an internal network over a shared infrastructure using dedicated connections.Remote Access VPN : Remote access VPNs provide remote users access to an intranet or extranet over a shared infrastructure.There are two VPN topologies to consider: It can be used in protecting data flows between a pair of hosts (host-to-host), between a pair of security gateways (network-to-network), or between a security gateway and a host (network-to-host). IPsec is an end-to-end security scheme operating in the Internet Layer of the Internet Protocol Suite. IPsec also includes protocols for establishing mutual authentication between agents at the beginning of the session and negotiation of cryptographic keys to be used during the session. Internet Protocol Security (IPsec) is a protocol suite for securing Internet Protocol (IP) communications by authenticating and encrypting each IP packet of a communication session.
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