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Category Archives for "Networking"

Submarine Cable Basics

Submarine Cable is probably the most important topic for the International traffic. More than 99% of the International traffic , including data, voice and video is carried over Submarine Cables.   But still submarine cables is not very well known topic among the network engineers, especially if you are not working in the Service Provider, […]

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IDG Contributor Network: Update on Spectrum: Billing systems scheduled to be merged

Back in May 2016 when Charter officially closed the deal to acquire Time Warner Cable and Bright House Networks, they took on a monumental task of merging many different systems to make one cohesive customer experience. (As a disclaimer, my company does sell and manage Spectrum Enterprise services.)This deal was worth over $60 billion and effects over 90,000 employees and 25 million customers with significant coverage in 48 states. Among old school telecom pros, the move to snag Tom Rutledge from Cablevision in late 2012 and relocating the headquarters to Tom’s backyard in Connecticut was a sign of big things to come.As it stands today, Spectrum does not have an online payment option for enterprise services that allows you to view your bill or even your bill amount. Bright House did have a platform but it was recently taken down after performing some maintenance, pointing customers to the Spectrum Business billing log in.To read this article in full or to leave a comment, please click here

Worth Reading: A brittle and fragile future

While this is not intended to be a dystopian rant, I feel strongly motivated to draw attention to the fragile and interdependent future we are creating through the use of programmable devices and systems. Some of you are, no doubt, rather tired of this theme, but as we equip cyber-physical and virtual systems with programs that animate their functions, it seems inescapable that over time they will become increasingly interdependent and that may produce vulnerabilities and fragilities that will be exploited by inimical parties or will simply create difficult and even unrecoverable failures. —ACM Queue

The post Worth Reading: A brittle and fragile future appeared first on rule 11 reader.

IDG Contributor Network: 3 leading indicator Software-as-a-Service metrics to understand where your business is heading

We all know the flagship metrics by which Software-as-a-Service businesses are gauged — Customer Acquisition Cost, Customer Lifetime Value, churn and the like. Understanding these metrics is key to measuring the health and value of a Software-as-a-Service (SaaS) business, and if you’re the operator of a SaaS company, you should have a deep understanding of what each of these metrics means, how to measure them for your business and whether your metrics are healthy or indicate potential issues.Every company is different, but a combination of common knowledge and some business-specific reasoning should give you a sense of whether your SaaS metrics jive with where you want your business to head.To read this article in full or to leave a comment, please click here

BGP FlowSpec on white box switch

BGP FlowSpec is a method of distributing access control lists (ACLs) using the BGP protocol. Distributed denial of service (DDoS) mitigation is an important use case for the technology, allowing a targeted network to push filters to their upstream provider to selectively remove the attack traffic.

Unfortunately, FlowSpec is currently only available on high end routing devices and so experimenting with the technology is expensive. Looking for an alternative, Cumulus Linux is an open Linux platform that allows users to install Linux packages and develop their own software.

This article describes a proof of concept implementation of basic FlowSpec functionality using ExaBGP installed on a free Cumulus VX virtual machine.  The same solution can be run on inexpensive commodity white box hardware to deliver terabit traffic filtering in a production network.

First, install latest version of ExaBGP on the Cumulus Linux switch: 
curl -L https://github.com/Exa-Networks/exabgp/archive/4.0.0.tar.gz | tar zx
Now define the handler, acl.py, that will convert BGP FlowSpec updates into standard Linux netfilter/iptables entries used by Cumulus Linux to specify hardware ACLs (see Netfilter - ACLs): 
#!/usr/bin/python
 
import json
import re
from os import listdir,remove
from os.path import isfile
from  Continue reading

Reflecting On My First Cisco Live! Presentation

Well, I got to tick a big item off my list of goals last week. I successfully delivered a presentation at Cisco Live! in front of a large group of people. It didn’t kill me and I didn’t trip over anything and embarrass myself so no matter what, I have those two points to feel good about :-)

Me starting my presentation
Me starting my presentation

All joking aside, it actually went a whole lot better than that.

I’ve recently realized that I really enjoy teaching. Not in the sense that I want to be a trainer full time or have a job in a classroom, more like I feel that’s a big part of what drives me to write this blog and is why I feel (relatively) comfortable talking in front of people. As long as the subject is something that I feel I can weave some teaching/learning into, I’m comfortable to deliver it. By contrast, I would feel far less comfortable delivering something like a keynote speech or a toast at a wedding.

So along those lines, that was a big goal I set for myself in delivering my Cisco Live! (CLUS) presentation: empower the audience by sharing targeted, high-value knowledge and Continue reading

Mist’s wireless network lets companies personalize the user experience

The Wi-Fi networks of today were architected more than a decade ago. That even predates the iPhone, which ushered in the era of mobility. These old Wi-Fi architectures aren’t ready to handle the vast number of mobile devices that want to connect to wireless networks today.What’s more, these networks aren’t able to put any focus on what users experience when they are connected.The old generation of Wi-Fi networks are a hindrance to businesses that want to increase customer engagement over ubiquitous mobile devices. For example, restaurants and retail stores would like to capture customers’ attention by offering real-time discounts or coupons when customers enter or walk by the establishment. Doing so requires the use of several technologies that old wireless networks just can’t support at scale.To read this article in full or to leave a comment, please click here

Mist’s wireless network lets companies personalize the user experience

The Wi-Fi networks of today were architected more than a decade ago. That even predates the iPhone, which ushered in the era of mobility. These old Wi-Fi architectures aren’t ready to handle the vast number of mobile devices that want to connect to wireless networks today.What’s more, these networks aren’t able to put any focus on what users experience when they are connected.The old generation of Wi-Fi networks are a hindrance to businesses that want to increase customer engagement over ubiquitous mobile devices. For example, restaurants and retail stores would like to capture customers’ attention by offering real-time discounts or coupons when customers enter or walk by the establishment. Doing so requires the use of several technologies that old wireless networks just can’t support at scale.To read this article in full or to leave a comment, please click here

NVM Express spec updated for data-intensive operations

This is another one of those geeky stories that actually has some significance. The Non-Volatile Memory (NVM) Express group has issued version 1.3 of its SSD spec, with emphasis on performance around analytics and virtualization. NVMe is a communications interface/protocol designed specifically for solid-state drives (SSDs) because the old standard, SATA, was a relic of the hard disk days and nowhere near fast enough to provide proper throughput for flash memory. The NVM Express organization consists of storage and flash vendors such as Intel, Samsung, Sandisk, Dell EM, and Seagate. NVMe works with the M.2 and PCI Express buses, which are considerably faster than SATA. For example, it can handle 65,000 queues instead of one like in SATA, which is idea for a server environment where there is a lot of I/O. To read this article in full or to leave a comment, please click here

Off The Cuff – Conferences And Social Media For Engineers

What is the value of conferences and social media for network engineering types? Come hear out panel talk about how these tools have enhanced and changed their careers. This episode was recorded at Cisco Live in Las Vegas, NV.

 

Outro Music:
Danger Storm Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/by/3.0/

Tom Hollingsworth
Guest
Aaron Conaway
Guest
Jonathan Davis
Guest
Marena Karasevich
Guest
Jordan Martin
Host

Audio Only Podcast Feed:

The post Off The Cuff – Conferences And Social Media For Engineers appeared first on Network Collective.

Off The Cuff – Conferences And Social Media For Engineers

What is the value of conferences and social media for network engineering types? Come hear out panel talk about how these tools have enhanced and changed their careers. This episode was recorded at Cisco Live in Las Vegas, NV.

 

Outro Music:
Danger Storm Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/by/3.0/

Tom Hollingsworth
Guest
Aaron Conaway
Guest
Jonathan Davis
Guest
Marena Karasevich
Guest
Jordan Martin
Host

Audio Only Podcast Feed:

The post Off The Cuff – Conferences And Social Media For Engineers appeared first on Network Collective.

VTP modes and versions : VTPv1, VTPv2 and VTPv3

This topic is basically on the VLAN trunking Protocol which is called as VTP. I am talking about this topic as i am getting a lot of queries about the VTP protocol. Some of the questions i will summarised with this article. There are some of the questions which often asked at the time of the interview and are the basic questions.

Below are the questions about the VTP.
  • So what actual VTP do ? 
  • How we manage VLANs with the VTP ?
  • What are the various versions of VTP ?
  • How they differ from each other ?
  • what is the range of the VLANs supported ?
  • What is VTP Pruning ?
  • What are VTP modes ?
  • What are the different kinds of VTP advertisements ?

I understand there might be more queries on the VTP but let's start with the general talk about the VTP first. May be with this article most of the queries will be understandable.

Fig 1.1- Sample Switched Network

So VTP is a called as Layer 2 messaging protocol that contains VLAN configuration information  by managing the addition, deletion, and renaming of VLANs within a VTP domain. A VTP domain (also called a VLAN management domain) is made up of one Continue reading

Brocade : Zone‐Based Firewall

Today I am going to talk about the configuration of the Brocade router as Zone-Based Firewall. The first query in your mind will be that what is this zone based firewalls are ?

Well Zone based Firewalls are interfaces that are grouped into security “zones,” where each interface in a zone has the same security level.

In the Zone Based Firewalls, the packet-filtering policies are applied to the traffic flowing between the various zones in the network which is defined by the network administrator . So the concept is simple that the traffic flowing between interfaces that is there in the same zone is not filtered and flows freely because the interfaces share the same security level and the traffic flowing between the different zones will be filtered accordingly as security level can be different for different zones.

I will come up the Zone based Firewalls for Cisco soon in another article where i can share the configurations with the topology. This article is purely of Brocade where it is worked as Zone Based Firewall.

So below is the network where we defined three different zones which is defined by network administrator as per the demand in the network. The Zones are

1 … 1,684 1,685 1,686 1,687 1,688 … 3,420