What Is The Difference Between Ipsec Vpn Gre Tunnel

Vpn gateway a encrypts the private ip packet and relays it over an esp tunnel to a peer vpn gateway at the edge of network b vpn gateway b then decrypts the packet and delivers it to the destination host.

What is the difference between ipsec vpn gre tunnel. Configuring a gre tunnel. Related gre over ipsec vs ipsec over gre. The end user systems detects data flows which need to be encrypted on tunnel interfaces.

Ipsec transport mode is usually used when another tunneling protocol like gre is used to first encapsulate the ip data packet then ipsec is used to protect the gre tunnel packets. Like ipsec vpns gre tunnels are used to create point to point connections between two networks. Ipsec protects the gre tunnel traffic in transport mode.

Difference between tunnel and vpn very general question. The packet diagram below illustrates ipsec transport mode with esp header. While ipsec offers confidentiality through authentication gre offers less security.

Gre tunnels provide workarounds for networks with limited hops. The ip security ipsec encapsulating security payload esp defined by rfc 2406 also encapsulates ip packets. It is stateless and has no flow control mechanisms.

Ipsec is the primary protocol of the internet while gre is not. However it does so for a different reason. Gre tunnels connect discontinuous sub networks.

Ipsec offers more security than gre does because of its authentication feature. Like gre it doesn t really matter how the two vpn gateways communicate with each other hops in between just pass along the esp packet. Generic routing encapsulation gre on the other hand is a tunneling protocol that is used to carry other routed protocols in an ip network as well as ip packets in an ip network.