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Category Archives for "Networking"

Concept of Local Preference in BGP : BGP Attribute

Today I am going to talk about the BGP attribute which is widely used in many of the enterprise networks. BGP attribute name "Local Preference" is used for controlling outbound traffic in the network. It actually used when we have two different paths and want to select the preference path then we are going to use the local preference by putting the higher local preference value to the route.
Local Preference is not local to the router, the local preference attribute is part of the routing update and is exchanged among routers in the same AS. So if you applied local preference in your network it will effect the network part which is under same AS.

We have two different method to apply the local preference in the network. The one way is to use the bgp default local-preference command and the other way is by using the route-map to set the local preference. I will cover the configuration part of the both the ways in the network.

Below is the basic topology where we are using the local preference in the enterprise network. The topology and the IP addresses uses here below is for the demo purposes and has Continue reading

New design of www.orhanergun.net

I used to receive many queries on design of website and we did few changes. Changes especially on the homepage. Previously the blog posts were in the orhanergun.net/blog and we moved them to homepage. So they are now accessible directly from the homepage which is www.orhanergun.net Also, added an announcement section to homepage where you will […]

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Netmiko Getting Started

Netmiko is a python library created by a living legend amongst network engineers, Kirk Byers. Netmiko aims to simplify SSH connections to network devices with python by extending the paramiko library to deal with the idiosyncrasies of SSHing to our favorite network gear. Netmiko has a huge...

Cisco CSR 1000v Vagrant Box Install

This blog covers how to install Cisco csr1000v boxes for use with Vagrant. Cisco does not provide a csr1000v Vagrant box so similar to my other post on creating a Vagrant box from the ASAv ova, I will show you how to create a csr1000v Vagrant box. This post assumes that you already have a...

Very important update on CCDE Practical Exam Result !

As you might know May 2017 exam was cancelled due to leakage and I shared a post on it on May.   It was very important step taken by Cisco to secure the exam.   Now, it seems another important step is taken by Cisco.   Below message sent by Pearson to the CCDE Practical […]

The post Very important update on CCDE Practical Exam Result ! appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.

Downloading YouTube Videos From Links Saved In Google Chrome Bookmarks

The Bash script youtube-bookmarks-mp3.sh is using Python youtube-dl script along with ffmpeg in order to download videos from YouTube service. It also enables youtube-dl to convert videos to mp3 audio format. The script exports YouTube links from Bookmarks and copy them into the file bookmarks.txt. Multiple videos are downloaded and converted simultaneously in the background by the script.

Note: According to YouTube Terms of Service, you shall not copy, reproduce, distribute, transmit, broadcast, display, sell, license, or otherwise exploit any Content for any other purposes without the prior written consent of YouTube or the respective licensors of the Content.

Checkpoint Portals

All Checkpoint portals are configured under the Gateway properties.
The IP address of the portal must be that of an IP of an interface on the checkpoint (loopback or physical).
Can either use a different IP for each portal or the same IP for all portals. All portals with the same IP address use the same certificate.

Virtual Reality and Skeuomorphism

Remember skeuomorphism? It’s the idea that the user interface of a program needs to resemble a physical a physical device to help people understand how to use it. Skeuomorphism is not just a software thing, however. Things like faux wooden panels on cars and molded clay rivets on pottery are great examples of physical skeuomorphism. However, most people will recall the way that Apple used skeuomorphism in the iOS when they hear the term.

Scott Forrestal was the genius behind the skeuomorphism in iOS for many years. Things like adding a fake leather header to the Contacts app, the wooden shelves in the iBooks library, and the green felt background in the Game Center app are the examples that stand out the most. Forrestal used skeuomorphism to help users understand how to use apps on the new platform. Users needed to be “trained” to touch the right tap targets or to feel more familiar with an app on sight.

Skeuomorphism worked quite well in iOS for many years. However, when Jonny Ive took over as the lead iOS developer, he started phasing out skeuomorphism starting in iOS 7. With the advent of flat design, people didn’t want fake leather and Continue reading

Worth Reading: Deep dive into Sky Lake

The architecture of Skylake is very different from that of the prior “Haswell” and “Broadwell” Xeon chips, and will be carried forward with the next-generation “Cascade Lake” processors that will very likely be implemented in a highly tuned 14 nanometer process – what Intel calls 14++ nanometer in its chip manufacturing presentations. (We had not heard of Cascade Lake before, and assumed future Xeons would be based on the “Kaby Lake” design already implemented in the Xeon E3 chips for single-socket servers.) The point is, the Socket P form factor for Xeon SP processors will be used for at least two generations of server chips, and possibly more. —Timothy Prickett Morgan @ The Next Platform

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Recap: How to make a Cloudflare App workshop in Austin

Cloudflare hosted a developer preview workshop in Austin for Cloudflare Apps, taught by Zack Bloom, tech lead of Cloudflare Apps. Due to popular request, we are making available the video from the workshop.


Want some ideas on what to start with? Check out the idea suggestion list on our Cloudflare Community page. It's a great idea to review our Apps documentation available here.

Want to request a Cloudflare Apps workshop in your city? Please drop a line to [email protected]

Share your works in progress and compare notes with other developers on the community forum.

Worth Reading: Ops is everyone’s job now

Distributed systems are never “up”; they exist in a constant state of partially degraded service. Accept failure, design for resiliency, protect and shrink the critical path. You can’t hold the entire system in your head or reason about it; you will live or die by the thoroughness of your instrumentation and observability tooling. You need robust service registration and discovery, load balancing, and backpressure between every combination of components. You need to learn to integrate third-party services; many core functions will be outsourced to teams or companies that you have no direct visibility into or influence upon You have to test in production, and you have to do so safely; you cannot spin up a staging copy of a large distributed system. —Charity Majors @ opensource

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