OSPF Default-Information Originate – Built-in Loop Prevention with ALWAYS keyword
This post represents the solution and explanation for quiz-24. Quiz Review Quiz #24 opens the discussion about a scenario in which traffic is black-holed when a certain link fails. Let’s summarize the quiz: company ABC runs OSPF internally, in all 3 buildings internet access is provided via 2 Border Routers (BR-B and BR-C) each connected to a separate ISP each BR receives a default route from its directly connected ISP... [read more]Establish Static Redundancy via DSL Connection
It is a popular method for small businesses to utilize their local ISP’s business class DSL service. It is a also a great rule of thumb to multi-home your connection by using 2 separate ISP’s (Cox and Verizon for example). You would ideally want to either load balance your traffic between the 2 connections or […]
Author information
The post Establish Static Redundancy via DSL Connection appeared first on Packet Pushers Podcast and was written by Korey.
OSPF Default-Information Originate – Side Effects of ALWAYS keyword
This post represents the solution and explanation for quiz-24. It shows that using always option with default-information originate may have an undesired effect !...
Netflix is using obfuscation to not pay their fair share!
Netflix is using obfuscation to not pay their fair share!
by Scott Sherwood, CEO - December 2, 2014
As a CEO of a company, I would love to have someone subsidize my business and reduce my costs to deliver products to my customers. Yet for-profit company Netflix, which uses more Internet bandwidth than anyone in the world, wants network providers to connect them up for free. Yes, for free. They are using terms such as “Network Neutrality” to make the large telecom providers seem like bad guys, while creating confusion to hide behind their greed. For Netflix, delivery of content is like a cost of goods sold, but they just don’t want to pay their fair share.
In his in-depth article last week for Forbes – How Netflix Poisoned The Net Neutrality Debate – author Larry Downes traces the origins of today’s fight over network neutrality back to March of this year. He references a blog post by Netflix CEO Reed Hastings that “…urged the FCC to redefine net neutrality, transforming it from a set of last-mile consumer protections to detailed government control of connections at the Internet’s back-end. Rather than pay the transit providers, Netflix wanted to connect directly Continue reading
30 Blogs in 30 Days – Lessons Learned
So with some triumph and minor exhaustion, I completed Etherealmind’s 30 Blogs in 30 Days challenge; but so what? Does it change anything? Do I get a prize? Here’s what I learned. 30 Blogs in 30 Days As a reminder, … Continue reading
If you liked this post, please do click through to the source at 30 Blogs in 30 Days – Lessons Learned and give me a share/like. Thank you!
30 Blogs in 30 Days – Lessons Learned
So with some triumph and minor exhaustion, I completed Etherealmind’s 30 Blogs in 30 Days challenge; but so what? Does it change anything? Do I get a prize?
Here’s what I learned.
30 Blogs in 30 Days
As a reminder, I started this challenge on October 16 and posted every day from then until November 16 (actually just over 30 days, but who is counting). I found the process quite interesting, so I decided to share a few things that struck me along the way.
Write It Down
It sounds obvious, but if you’re a blogger, how many times have you thought to yourself “Oooh, such and such would make a good blog post,” then when you have a chance to write some content you go blank on what this great topic was? I have this happen a lot. Trying to create one blog post a day meant that forgetting posts topics was not a luxury I could afford to have if I wanted to avoid staring at my screen for hours. I had to start keeping a Notes file open on my phone, occasionally took an audio note, and kept an iCloud-synced “Ideas for Blog” file in MultiMarkdown Composer. I found Continue reading
HP Networking – Hitting The Right Notes
HP has quietly been making waves recently with their networking strategies. They recently showed off their technology around software defined networking (SDN) applications at Interop New York. Here’s a video:
It would seem that HP has been doing a lot of hard work on the back end with SDN. So why haven’t we heard about it?
Trumpet and Bugle
HP Networking hasn’t been in the news as much as Cisco and VMware as of late. When you consider that both of those companies are pushing agendas related to redefining the paradigm of networking around policy and virtualization their trumpeting of those agendas makes total sense. But even members of the League of Non-Aligned Vendors like Brocade are talking a lot about their SDN strategy with the Vyatta Controller and OpenStack integrations. Vendors have layers and layers of plans for the “new” networking. But HP has actually been doing it! Why haven’t we known until now?
HP has been content to play the role of the bugler to the trumpeters of the bigger organizations. Rather than talking over and over again about what they are planning on doing, HP waits until they’ve actually done it to talk Continue reading
Wireshark Tid-bit: What does the IP Identification field tell us?
There are many different fields in the various headers we get to examine during packet analysis, one of the most overlooked field is the IP Identification field. This simple 16-bit field is displayed in Hex and has a few different uses, most importantly: Identifies fragmented packets. Identifies the individual packets that the sender transmits. How does […]
December CCIE Scholarship Winners
iPexpert’s 2014 Scholarship :: December 1st Winners
in December 2013, we announced our 2014 Scholarship Program / CCIE Lab Training Giveaway.
For the entire year of 2014, we gave giving away 60 free Online-HD-ILT Bootcamp seats, and CCIE Lab Self-Study Training Bundles spanning across every CCIE track we teach (R&S, Collaboration, Data Center, Wireless and Security). This concludes our 2014 CCIE Scholarship Giveaway.
The December 2014 winners of a free 5-Day Online-HD-ILT Bootcamp seat:
- R&S: @rperezdea
- Collaboration: @Hussein_A_Emam
- Data Center: @DavidSudjiman
- Wireless: wifihero
- Security: @eibanas
The December 2014 winners of a free Lab Essentials HD VOD and Workbook(s) Bundle:
- R&S: Gusdsalazar
- Collaboration: @Renilfo
- Data Center:@Bash_Mac
- Wireless: macdadwire
- Security: @AndreAubet
This winners must contact [email protected] with your name / contact information to receive your freebies! Thank you for entering, and congratulations to our December winners.
Cisco VIRL is finally out
How does Internet work - We know what is networking
Cisco finally released long-awaited personal network simulator VIRL. VIRL is a simulator like Cisco CML – Cisco Modelling Lab released few moths ago which is made available for business network simulations and testing in engineering normal day job. With VIRL we got a personal version of CML with drastically lower price tag aimed to help students preparing for Cisco CCNP and more than that for those preparing CCIE lab exam. VIRL will surely help the engineers managing small business network to proof their configuration change before applying it to real network. This solution give us a more stable and “official” GNS3 which will save
MPLS P-Router, Router or Layer-3 Switch?
One of my readers is struggling with the aftermath of marketing gimmicks:
We will be implementing a new network soon, and we're discussing P-routers versus regular routers versus switches. I'm looking for arguments to go one way or the other.
TL&DR: there’s no difference between router and L3 switch.
Read more ...Open vSwitch 2014 Fall Conference
Open vSwitch is an open source software virtual switch that is popular in cloud environments such as OpenStack. Open vSwitch is a standard Linux component that forms the basis of a number of commercial and open source solutions for network virtualization, tenant isolation, and network function virtualization (NFV) - implementing distributed virtual firewalls and routers.
The recent Open vSwitch 2014 Fall Conference agenda included a wide variety speakers addressing a range of topics, including: large scale operation experiences at Rackspace, implementing stateful firewalls, Docker networking, and acceleration technologies (Intel DPDK and Netmap/VALE).
The video above is a recording of the following sFlow related talk from the conference:
Traffic visibility and control with sFlow (Peter Phaal, InMon)
sFlow instrumentation has been included in Open vSwitch since version 0.99.1 (released 25 Jan 2010). This talk will introduce the sFlow architecture and discuss how it differs from NetFlow/IPFIX, particularly in regards to delivering real-time flow analytics to an SDN controller. The talk will demonstrate that sFlow measurements from Open vSwitch are identical to sFlow measurements made in hardware on bare metal switches, providing unified, end-to-end, measurement across physical and virtual networks. Finally, Open vSwitch / Mininet will be used to demonstrate Continue reading
The 6 Requirements for Data Center Networks
One way or another, all data center networks exhibit at least 6 different functional areas that their operators need to engineer, implement, and operate with a differing set of needs and requirements. Similarly, in one way or another, most of the available SDN and virtualized network solutions available today or in progress aim to deal with issues in one or more of these areas to improve their functional effectiveness, cost, automated-ness, or integrated-ness. Yet some areas receive an inordinate amount of focus/attention and those areas may not necessarily have the most opportunity for improvement. Let’s take a look at these 6 requirements in order of the opportunity value to bring new levels of effectiveness to data centers.
1) Edge Switching (inter-server or more generically, inter-end point):
Edge switching loosely covers the function of providing switching between end points, whether they be virtual servers, physical servers, storage devices, or terminating services devices (load balancers, firewalls, etc.) It is important to note that in a virtualized server environment, there is typically 2 layers of edge – a set of virtual switches that connect together VMs and a set of physical switches that connect the physical hosts.
Much of the attention and Continue reading
Show 214 – Storage versus Networking
The eternal loathing between Storage and Networking professionals has manifested into a podcast when I am joined by well known storage people to debate our dysfunctional family relationship.
Author information
The post Show 214 – Storage versus Networking appeared first on Packet Pushers Podcast and was written by Greg Ferro.
Response: Docker Networking | Chris Swan’s Weblog
I’ve spent some hours taking a look at Docker containers and how they connect to the network. The short summary is “messy” and better description is “train wreck”. Chris Swan has a 30 minute presentation on his experiences with Docker as part of his company VNS3. Docker Networking | Chris Swan’s Weblog. At this point […]
The post Response: Docker Networking | Chris Swan’s Weblog appeared first on EtherealMind.
ExtremeXOS, Arista and Cisco vIOS-Layer2 Virtual GNS3 Lab
http://brezular.com/2014/12/01/extremexos-arista-and-cisco-vios-layer2-virtual-gns3-lab/Viva España – Heading to HP Discover
It’s ironic to end the 30 day challenge by not posting for a short while, but what can I say? I’ve been very busy! Today I’m traveling to Barcelona to attend the HP Discover 2014 Barcelona event as a guest … Continue reading
If you liked this post, please do click through to the source at Viva España – Heading to HP Discover and give me a share/like. Thank you!
Viva España – Heading to HP Discover
It’s ironic to end the 30 day challenge by not posting for a short while, but what can I say? I’ve been very busy! Today I’m traveling to Barcelona to attend the HP Discover 2014 Barcelona event as a guest of HP’s Independent Blogger Programme. It looks like HP will be keeping us busy while we’re there, so I would predict quite a few posts coming out of this trip in the near future and I’m looking forwarding to hearing more about what HP is up to.
In early October I posted about HP’s SDN Mojo and OpenFlow deployment at Interop after they presented to us as part of Tech Field Day Extra. In that post I was impressed that HP had moved from talk to action as regards OpenFlow. I wonder what else HP has up its sleeves?
Do take a moment to check out HP Discover Barcelona 2014 and look at the Content Catalog. If nothing else, check out the SDN sessions in the content catalog. Hopefully that link will take you directly to the right results; there are some interesting sessions on that topic alone.
Like other events, HP will also be streaming some content live for Continue reading
Cisco VIRL goes public
It’s been a few years since the first whispers started leaking out about Cisco building an in-house software emulation platform. A Dynamips/GNS-like program that natively caters for the needs of Cisco students and engineers in the field has been a hot topic for a long time. Early last year Cisco made official mention that they […]
ExtremeXOS, Arista and Cisco vIOS-Layer2 Virtual GNS3 Lab
ExtremeXOS is a network operating system used in Extreme Networks network switches. Virtualized version of ExtremeXOS - EXOS virtual machine vmdk image can be used to build virtual lab without need to use hardware switches. Although ExtremeXOS virtual machine can be downloaded for free only certain features are known to work. For this reason software should not be used for testing any actual networking setups or performance tests.
The tutorial consist of two parts. The part one explains how to configure Qemu emulator to run ExtremeXOS virtual machine. In part two, ExtremeXOS VM is connected to virtual lab run by GNS3 software. In this lab, features such as VLANs, 802.1q trunks and OSPF routing protocol are tested between multilayer switches from different vendors - Cisco, Arista and Extreme Networks.
Host Software and Hardware Requirements
- Linux x86-64,
- Qemu emulator version 2.1.2 (qemu-system-x86_64, qemu-system-i386 ) or later,
- GNS3 version 1.1 or later,
- RAM - at least 4 GB,
- CPU with hardware virtualization support (VT-x or AMD-V)
Virtual Machines Software and Hardware Requirements
- ExtremeXOS VM 15.3.2, exosvm.vmdk,
RAM 256 MB ,CPU x86-64
Qemu additional parameters: -nographic -enable-kvm - Vios_l2-ADVENTERPRISEK9-M), Version 15.0, vIOS-L2.vmdk,
RAM 512MB, Continue reading