routing Archives - j2sw Blog

Unpopular opinion: BGP should accept smaller than a /24

For years, we have heard of the depletion of IPv4 address space on the Internet. At the same time, more and more networks are coming online. Out of these new networks, we have an ever-increasing number wanting to participate in BGP routing. This can be for several reasons. The first is for what BGP was designed for autonomy. Companies are not at the mercy of a single provider for critical infrastructure. If you have ever had to switch providers with IP addresses from...

Quantum Computing, and why you, as an Internet Service Provider should care

Quantum computing is one of those buzzwords floating around. Should you, as an Internet Service Provider, care? In this blog post, I will go over, at a high level, what quantum computing is and what to watch if you are a Service Provider. Quantum computing leverages the principles of quantum mechanics to perform complex computations exponentially faster than classical computers. Computers we are used to use bits (0s and 1s) to store and process information, whereas quantum computers use quantum bits, or qubits....

July 22, 2023 by j2sw Data Center

Open Shortest Path First (OSPF) overview

Open Shortest Path First (OSPF) is a widely used interior gateway routing protocol for Internet Protocol (IP) networks. OSPF is used by organizations to route traffic within their own networks, as well as between different networks. Here are some key points about OSPF: In conclusion, Open Shortest Path First (OSPF) is a widely used interior gateway routing protocol for IP networks. By using the SPF algorithm to determine the best routes for internet traffic, OSPF allows organizations to route traffic efficiently and reliably...

February 10, 2023 by j2sw Networking

Globe Ed Network Fundamentals

https://www.globed.net/courses/back-to-networking-basics In this Networking Basics Workshop we will be learning the following: REFERENCE MODELSETHERNET STANDARDS AND SPECSTRANSMISSION METHODSTOPOLOGIES NETWORKING DEVICESIPV4 ADDRESSINGHEX CONVERSIONCISCO ROUTER AND SWITCH BASICCISCO ROUTER AND SWITCH CONFIGURATIONLAYER 2 SWITCHING LAYER 3 ROUTINGLAYER 3 ROUTING USING L3 SWITCHING RECORDINGS OF THE WORKSHOP WILL BE SENT TO ALL THAT REGISTER – Even to those that could not attend

September 24, 2021 by j2sw Networking switching

A tool to find out if BGP is lying to you

APNIC has a bog article on detecting “bgp lies”. https://blog.apnic.net/2021/05/24/a-tool-to-detect-bgp-lies/Do you ever wonder whether you can really trust other networks, such as your provider(s) and peers? More precisely, wouldn’t you like to be able to tell if the traffic you send always flows through the paths received in the Border Gateway Protocol (BGP)? Could it be that, for some prefixes, the forwarding path might differ?

May 24, 2021 by j2sw BGP Networking

What is routing? MANRS

August 13, 2020 by j2sw BGP Networking

RPKI and misconceptions

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After my blog post about Hurricane Electric and RPKi support, I was seeing some comments by folks that warrant some clarification. I put together a short midnight podcast on this. To summarize1. route original validation is not the same as having ROA’S with your RIR2. If you have an ASN you should have a peering DB entry3.ROAs have nothing to do with your router supporting RPKI

July 8, 2020 by j2sw news Podcast Technology

ARIN resources and the Service Provider

Internet Service Providers (ISPs) can be intimidated by all of the facets of working with the American Registry of Internet Numbers (ARIN). I have put together a guide that outlines common things you, as a service provider, need to do. This guide is not an end-all how-to. Throughout, I am posting videos and links taken from the ARIN site to help. This article is more of an outline of what a service provider needs to do. The majority of the steps below will...

July 7, 2020 by j2sw BGP IPV6 Networking peering xISP