routing Archives – Practical Networking .net

OSPF Training Course – Module 1

Ed Harmoush — Tue, 26 Apr 2022 21:47:53 +0000

Recently I’ve been working on a Practical OSPF deep dive training course on Youtube. The content of the first module is available for free on Youtube: For those of you who prefer learning by reading, I thought I also provide the training series in article form. OSPF is an IGP, Link State, Dynamic Routing Protocol.… Read More »OSPF Training Course – Module 1

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Local Broadcast vs Directed Broadcast

Ed Harmoush — Wed, 02 Sep 2020 15:00:00 +0000

Two types of Broadcast IP addresses exist: the Local Broadcast IP address and the Directed Broadcast IP address. In the current networking world, they mostly serve the same function. But one of them contains an additionally piece of functionality. In this article we’ll clearly illustrate both concepts, and show you their functionality. We’re going to… Read More »Local Broadcast vs Directed Broadcast

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Route Precedence — How does a Router choose its preferred path?

Ed Harmoush — Wed, 01 Apr 2020 18:26:00 +0000

Whenever possible, Routers should have multiple paths (or routes) to get to a target network — this is a key component for network resiliency. Which means Routers routinely compare routes to choose one preferred path among multiple that may exist. The Route Precedence process is accomplished by comparing three different attributes. This video steps through… Read More »Route Precedence — How does a Router choose its preferred path?

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VPN with Overlapping Networks

Ed Harmoush — Tue, 05 Dec 2017 17:00:24 +0000

When connecting two sites together using a Virtual Private Network (VPN), a common issue that is encountered is trying to build a VPN with overlapping networks — where both sites happen to use the same Private IP addresses. In such cases, hosts on one side of the VPN tunnel will be unable to communicate with… Read More »VPN with Overlapping Networks

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BGP Oldest Path

Ed Harmoush — Wed, 10 May 2017 20:37:41 +0000

BGP is the predominant dynamic routing protocol used to exchange routes between different autonomous systems. BGP’s popularity lies in the Path Selection process which allows extremely granular control of the path for incoming and outgoing traffic. One of the steps in this process states that if a tie still exists between two paths, BGP will… Read More »BGP Oldest Path

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EIGRP Feasibility Condition

Ed Harmoush — Tue, 12 Apr 2016 01:03:51 +0000

EIGRP is a routing protocol whose strategy to prevent routing loops is based upon what is known as the EIGRP Feasibility Condition. EIGRP also makes use of another concept called Split Horizon, which we will also briefly touch on later in this article. To properly discuss the Feasibility Condition however, you must have an understanding… Read More »EIGRP Feasibility Condition

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EIGRP Metric

Ed Harmoush — Fri, 08 Apr 2016 21:19:44 +0000

The EIGRP Metric has caused confusion for many network engineers trying to understand the protocol. This article will dive into what the metric is, and how to boil it down into its simplified form. Formula and K-Values EIGRP is a Cisco Proprietary routing protocol created in the 1980s. As such, Cisco was the only vendor… Read More »EIGRP Metric

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Understanding EIGRP

Ed Harmoush — Fri, 08 Apr 2016 00:11:12 +0000

Anyone who has ever studied the EIGRP protocol has at some point or another been confused by the awkwardly defined terminology that is incorporated into the protocol. This article’s purpose will disambiguate all the EIGRP terminology that causes so much confusion when trying to understand the protocol. Terms that Describe Routes From the perspective of… Read More »Understanding EIGRP

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