Tag: VPN

Dynamic Routing Through IPSec Without GRE – Using VTI’s

Dynamic Routing Through IPSec Without GRE – Using VTI’s

On a previous post, we created a GRE tunnel to permit routing protocol through an insecure (Internet) network and protected it with IPSec. As you all should know GRE adds another layer of encapsulation (at least 4 bytes), which means more overhead. One major advantage compared with the traditional method of IPSec is that, since … Continue reading Dynamic Routing Through IPSec Without GRE – Using VTI’s

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GRE IPSec Tunnel – Routing over the Tunnel

GRE IPSec Tunnel – Routing over the Tunnel

Using the same topology and part of the configuration of a previous post (IPSec IKEv1 Formula) we will configure a GRE (Generic Routing Encapsulation) to allow routing protocols (IGP - Interior Gateway Protocols) through the Internet safely. IPSec IKEv1 has a minor issue related to the packets that permits through, and this will be Unicast … Continue reading GRE IPSec Tunnel – Routing over the Tunnel