Category: Routing

Posts related to operations with a Cisco router.

bookmark_borderUnleashing the Power of pfSense: The Ultimate Firewall Solution

Posted on by admin

This article delves into the key features, benefits, and practical applications of pfSense, illustrating why it is a top choice for network security. In the ever-evolving landscape of network security, businesses and individuals alike require robust, reliable, and flexible firewall solutions to protect their digital assets. pfSense stands out as a leading open-source firewall and router software, offering a rich feature set, ease of use, and exceptional performance.

pfsense – landing page

Continue reading “Unleashing the Power of pfSense: The Ultimate Firewall Solution”

bookmark_borderiBGP inside VRF configuration on a Cisco Nexus switch

Posted on by admin

Due to a more complex network topology (because of the desire to save money) I recently had to implement iBGP routing inside a VRF on a cluster of Cisco Nexus switches.

Configuring iBGP (Internal Border Gateway Protocol) within a VRF (Virtual Routing and Forwarding) instance on a Cisco Nexus switch involves several steps. Below is a step-by-step guide to help you set it up: Continue reading “iBGP inside VRF configuration on a Cisco Nexus switch”

bookmark_borderIPSEC/GRE VPN Tunnel and OSPF Configuration

Posted on by admin

Configuring an IPsec GRE (Generic Routing Encapsulation) VPN tunnel with OSPF (Open Shortest Path First) involves several steps. In this example, we’ll configure a basic IPsec GRE VPN tunnel between two routers and enable OSPF routing over the tunnel. For this example, we’ll assume Router A and Router B are the two endpoints of the VPN tunnel.

Continue reading “IPSEC/GRE VPN Tunnel and OSPF Configuration”

bookmark_borderHow to Configure OSPF Route Redistribution

Posted on by admin

Route redistribution in OSPF (Open Shortest Path First) allows routes learned from one routing protocol to be advertised and used in another routing protocol. Redistribution can be useful in scenarios where multiple routing protocols are used within an enterprise network. Here’s a basic guide on how to configure route redistribution in OSPF:

Continue reading “How to Configure OSPF Route Redistribution”

bookmark_borderHow to configure OSPF with BGP on top

Posted on by admin

Configuring OSPF (Open Shortest Path First) with BGP (Border Gateway Protocol) on top is a common practice in large-scale networks where OSPF is used for intra-domain routing and BGP is used for inter-domain routing. This approach is often referred to as “OSPF as the IGP (Interior Gateway Protocol) and BGP as the EGP (Exterior Gateway Protocol).” Here’s a basic guide on how you can configure OSPF and BGP coexistence:
Continue reading “How to configure OSPF with BGP on top”

bookmark_borderHow to configure BGP AS Prepending

Posted on by admin

BGP AS (Autonomous System) prepending is a technique used to influence the inbound traffic by making a particular Autonomous System path less attractive. This is achieved by adding the AS number multiple times to the AS path attribute of BGP updates sent to a neighbor. The idea is to make the AS path longer, and therefore less preferred, in order to influence incoming traffic.

Here’s a general guide on how to configure BGP AS prepending:
Continue reading “How to configure BGP AS Prepending”