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Category Archives for "Networking"

Discussing Disruption to IT

Disruption has come to mean different things in the realm of IT. It’s difficult to read social media for a day without seeing the word "disruption" abused by the great marketing machine.

Using this word in the context of "disruption to service" or put it another way, "What happens when something doesn’t work?", it’s difficult to come up with a good anecdote to describe the impact of something going wrong when you’re in front of customers without sounding like another marketeer. I firmly believe in delivering value by "showing" as opposed to just battering your audience with slide ware. 

Still, in networking we are actually going through a period of huge change. The CLI skill set is still dominant and I’m not scare mongering when I say over time this will change. It will. It just won’t change as fast as some people will have you believe. Anyway, I digress. 

Fred

At college, I studied the greatest passion in life I had at the time, which was electronics. The local college department was ok and the material was industry standard stuff. Nothing crazy and out there, but useful and real. We had one super hero in the Continue reading

New products of the week 10.3.16

New products of the weekOur roundup of intriguing new products. Read how to submit an entry to Network World's products of the week slideshow.Daptiv TTMKey features: With Daptiv TTM, teams can better track tasks and submit timesheets, stakeholders get a more accurate view of project status, and initiatives move forward on time and on budget. More info.To read this article in full or to leave a comment, please click here

New products of the week 10.3.16

New products of the weekOur roundup of intriguing new products. Read how to submit an entry to Network World's products of the week slideshow.Daptiv TTMKey features: With Daptiv TTM, teams can better track tasks and submit timesheets, stakeholders get a more accurate view of project status, and initiatives move forward on time and on budget. More info.To read this article in full or to leave a comment, please click here

Can you hack the vote? Yes, but not how you might think

With Donald Trump already talking about the presidential election being rigged, Symantec has set up a simulated voting station that shows how electronic systems might be hacked to alter actual vote tallies for just a few hundred dollars.+More on Network World: Was Trump bitten by Twitter time-stamp bug that stung Alec Baldwin’s wife?+They found that while it’s possible to change the number of votes cast for each candidate, it would be very difficult to do so on a large enough scale to swing the election one way or the other.To read this article in full or to leave a comment, please click here

Seattle substation is cool enough to draw a crowd

Welcome to the substationImage by NBBJThe typical substation is a high-voltage blot on the landscape. But not this one. Seattle’s Denny substation is under construction in a dense urban neighborhood instead of being screened from the public, and it aims to welcome pedestrians rather than fence out trespassers.To read this article in full or to leave a comment, please click here

Building a Raspberry Pi-powered Barkometer, Part 4

In Part 3 of my epic series “Building a Raspberry Pi-powered Barkometer”, I covered how to capture audio using the arecord command and how I’d discovered that I got better sound out of an old USB webcam than the fancy-schmancy (but very cheap) USB sound card I started out with. I wound up in Part 3 collecting 60-second sound files in WAV format in a subdirectory on the Raspberry Pi, each named for the sample’s start time (e.g. 2016-09-07-04-42-27.wav).We need to get these files off of the RPi so we can analyze them. In theory, this could be done on the board but for now  we’ll FTP them to another machine for analysis. So, to get the recordings to somewhere we can slice and dice them, we’re going to use ncftpput, an FTP utility included the ncftp package. To install ncftp we'll run the following command on the RPi command line (as always, when installing a new package, you should run sudo apt-get update first):To read this article in full or to leave a comment, please click here

Shadow Brokers rant about people wanting stolen NSA-linked hacking tools for free

The hacking group trying to auction off NSA-linked Equation Group hacking tools is unhappy because no one has coughed up the big bucks yet to buy the exploits.On Saturday, the Shadow Brokers took to Medium to release the group’s third message. The hackers sound hurt that people don’t trust them and – if cursing is any indication – the hackers are angry that the Equation Group cyber weapons auction has flopped so far.The Shadow Brokers want $1 million dollars and sound irritated that interested parties want the stolen hacking tools for free. “Peoples is having interest in free files. But people is no interest in #EQGRP_Auction.”To read this article in full or to leave a comment, please click here

Shadow Brokers rant about people wanting stolen NSA-linked hacking tools for free

The hacking group trying to auction off NSA-linked Equation Group hacking tools is unhappy because no one has coughed up the big bucks yet to buy the exploits.On Saturday, the Shadow Brokers took to Medium to release the group’s third message. The hackers sound hurt that people don’t trust them and – if cursing is any indication – the hackers are angry that the Equation Group cyber weapons auction has flopped so far.The Shadow Brokers want $1 million dollars and sound irritated that interested parties want the stolen hacking tools for free. “Peoples is having interest in free files. But people is no interest in #EQGRP_Auction.”To read this article in full or to leave a comment, please click here

Packet Walk Through-Part 1

The objective of this blog is to discuss end to end packet (client to server)  traversing through a service provider network with special consideration on performance effecting factors.   

 

screenshot

 

 

We will suppose client needs to access any of the service hosted in server connected with CE-2, all the network links and NICs on end system are Ethernet based. Almost all the vendors compute machines (PC/ servers) are generating IP data gram with 1500 bytes size  (20 bytes header +1480  data bytes) in normal circumstances. 

ip

Fragmentation:- If any of link is unable to handle 1500 size IP data-gram then packet will be fragmented and forwarded to its destination where it will be re-assembled. The fragmentation and re-assembly will introduce overhead and  defiantly over all performance will be degraded.  In IP header following fields are important to detect fragmentation and to re-assemble the packets.

  •  Identification:- Is unique for all segments if packet is fragmented at all 
  •  Flags – 3 bits  . Bit 0 always 0, bit 1 -DF (Fermentation allowed or not  0 and 1 respectively), Bit 2-MF (More fragments expected or Last ,  1 and 0 respectively)
  • Fragments Offset :- Determine where data will start after removal of IP header in 1st and subsequent segments once packet is re-assembled.

With below Continue reading

Atlanta Ignites with Continued SharePoint and OneDrive Innovation!

This past week, Atlanta was host to about 25,000 visitors for Microsoft Ignite. During the Day 1 keynote, Jeff Teper, Corporate Vice President for OneDrive and SharePoint, took the stage for 15 minutes to introduce the continued investments Microsoft has made in SharePoint that were previewed in San Francisco on May 4, 2016. The SharePoint announcements were only part of an incredible array of announcements across the Office 365 family, including some major infrastructure and security announcements and some awesome features for Office that I can’t wait to try!To read this article in full or to leave a comment, please click here

IPv6 Transition Mechanisms | Dual-Stack -Tunnelling – Translation

IPv6 Transition Mechanisms The only available public IP addresses are IPv6 addresses. But vast majority of the content is still working on IPv4. How IPv6 users can connect to the IPv4 world and How IPv4 users can reach to the IPv6 content ? This is accomplished with the IPv6 transition mechanisms. In this post, I […]

The post IPv6 Transition Mechanisms | Dual-Stack -Tunnelling – Translation appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.

Survey on IXP Routing and Privacy

Marco Canini from UC Louvain is working on an IXP research project focused on bringing privacy guarantees into Internet routing context. They’re trying to understand the privacy considerations of network operators and have created a short survey to gather the initial data.

Researchers from UC Louvain have been involved in tons of really useful projects including BGP PIC, LFA, MP-TCP, Fibbing, Software-defined IXP and flow-based load balancing, so if you’re connected to an IXP, please take your time and fill in the survey.

Vault Overview

I have always loved Hashicorp’s Devops and cloud tools. I have used Vagrant, Consul, Terraform, Packer and Atlas before and I have written about few of them in my previous blogs. Vault is Hashicorp’s tool to manage secrets securely in a central location. Secret could be database credentials, AWS access keys, Consul api key, ssh … Continue reading Vault Overview →
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