Category: Routing

VRF and OSPFv3

VRF and OSPFv3

Virtual Routing Forwarding used to create virtual routing instances in a router. Configurations: R1 hostname R1 ! ! ip vrf BLUE  description BLUE Virtual Forwarding ! ip vrf RED  description RED Virtual Forwarding ! ! interface Ethernet0/0  description RED Network 10  ip vrf forwarding RED  ip address 10.0.0.1 255.255.255.0  ipv6 enable  ospfv3 1 ipv4 area … Continue reading VRF and OSPFv3

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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

Frame-Relay Cloud Configuration in Packet Tracer 7.0

Frame-Relay Cloud Configuration in Packet Tracer 7.0

I know that frame-relay is seeing his last days, but since some students asked for it here is as sample configuration of the generic cloud-pt as a frame-relay switch. 1º Step - Add a Generic Cloud to the Packet Tracer Topology 2º Step - Add 3 router C2911 3º Step - Add HWIC-2T modules to … Continue reading Frame-Relay Cloud Configuration in Packet Tracer 7.0

DMVPN – Dynamic Multipoint Virtual Private Network (Part-3)

DMVPN – Dynamic Multipoint Virtual Private Network (Part-3)

Continuing the previous configuration left from Part 1 and Part 2 we will finally enter the dynamic creation of tunnels between the SPOKES. To achieve this we will need to change the configuration in the tunnel interfaces of both the HUB and the SPOKES. Starting a clean sheet with the same initial configuration as before. … Continue reading DMVPN – Dynamic Multipoint Virtual Private Network (Part-3)

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