I was prompted to write this when I observed someone the other day who was sitting in the same training as me taking notes in a self-addressed email. No offense to people who do this, but W. T. F. How are you going to keep track of that email among the dozens/hundreds you receive every single day?
I take a lot of notes for research, certification study, and training. I use MediaWiki for almost all of these notes. Here's why.
Just spent a half hour sorting out some irritating search toolbar and browser hijack that my mum’s Mac seemed to have got from somewhere. Most of what I read on the internet seemed to be out of date or inaccurate maybe, so I’m posting my steps to getting rid of this here in case it is of use.
Environment: OSX 10.6.8 with Firefox 25.0.1
Symptoms: Normal home page has been replaced by some odd search engine. URL box shows “search.conduit.com/?ctid=CT3299872&SearchSource=13″.
The search box to the right of the URL box is showing “Installl [sic] converter customized web search” instead of Google.
Setting home page back to normal is overridden next time Firefox starts.
Resolution steps: Clicked Tools | Add-Ons and removed something not expected called “Youtube video downloader”. Clicked the top-right box’s dropdown and removed the search provider, setting it back to Google.
Home page was reset back to conduit.com on restarting Firefox still, so this needed further investigation. In the end, I removed the following two directories (the path may not be quite the same on your Mac):
Users/<user>/Library/Application Support/Firefox/Profiles/4ka1hno1.default/conduitCommon
Users/<user>/Library/Application Support/Firefox/Profiles/4ka1hno1.default/CT3299872
Restarted Firefox Continue reading
This post is intended to be a primer on the distributed routing in VMware NSX for vSphere, using a basic scenario of L3 forwarding between both virtual and physical subnets. I’m not going to bore you with all of the laborious details, just the stuff that matters for the purpose of this discussion.
In VMware NSX for vSphere there are two different types of NSX routers you can deploy in your virtual network.
Both the ESR and DLR can run dynamic routing protocols, or not. They can just have static/default routes if you like. The ESR is a router in a VM (it also does other L4-L7 services like FW, LB, NAT, VPN, if you want). Both the control and data plane of the ESR router are in the VM. This VM establishes routing protocol sessions with other routers and all of the traffic flows through this VM. It’s like a router, but in a VM. This should be straight forward, not requiring much explanation.
The ESR is unique because it’s more than a just router. It’s also a feature rich firewall, load balancer, Continue reading
This post is intended to be a primer on the distributed routing in VMware NSX for vSphere, using a basic scenario of L3 forwarding between both virtual and physical subnets. I’m not going to bore you with all of the laborious details, just the stuff that matters for the purpose of this discussion.
In VMware NSX for vSphere there are two different types of NSX routers you can deploy in your virtual network.
Both the ESR and DLR can run dynamic routing protocols, or not. They can just have static/default routes if you like. The ESR is a router in a VM (it also does other L4-L7 services like FW, LB, NAT, VPN, if you want). Both the control and data plane of the ESR router are in the VM. This VM establishes routing protocol sessions with other routers and all of the traffic flows through this VM. It’s like a router, but in a VM. This should be straight forward, not requiring much explanation.
The ESR is unique because it’s more than a just router. It’s also a feature rich firewall, load balancer, Continue reading
This post is intended to be a primer on the distributed routing in VMware NSX for vSphere, using a basic scenario of L3 forwarding between both virtual and physical subnets. I’m not going to bore you with all of the laborious details, just the stuff that matters for the purpose of this discussion.
In VMware NSX for vSphere there are two different types of NSX routers you can deploy in your virtual network.
Both the ESR and DLR can run dynamic routing protocols, or not. They can just have static/default routes if you like. The ESR is a router in a VM (it also does other L4-L7 services like FW, LB, NAT, VPN, if you want). Both the control and data plane of the ESR router are in the VM. This VM establishes routing protocol sessions with other routers and all of the traffic flows through this VM. It’s like a router, but in a VM. This should be straight forward, not requiring much explanation.
The ESR is unique because it’s more than a just router. It’s also a feature rich firewall, load balancer, Continue reading
This post represents the solution and explanation for quiz-17. For some temporary period of time, during network transition, your network consists both on Cisco and Juniper routers for the same role. You will see that they behave differently when it comes to advertising inactive BGP Routes.
Using a few guides on the web and a little bit of ingenuity I was able to get my FTDI-based, USB to 2x Serial adapter working in Mac OSX 10.9 Mavericks with iTerm 2. This post documents the process and resources used in the hope of becoming the definitive guide to setting up a USB serial adapter in OSX and using iTerm2 as the terminal emulator. Even if it isn’t quite definitive, it should at least be useful to others - I hope!
Using a few guides on the web and a little bit of ingenuity I was able to get my FTDI-based, USB to 2x Serial adapter working in Mac OSX 10.9 Mavericks with iTerm 2. This post documents the process and resources used in the hope of becoming the definitive guide to setting up a USB serial adapter in OSX and using iTerm2 as the terminal emulator. Even if it isn’t quite definitive, it should at least be useful to others - I hope!
The dual serial adapter above is my weapon of choice. You can pick one up for about £20 on Amazon(not an affiliate link). Generally speaking, I’ve had better experience with FTDI chipsets so if you are in the market for an adapter, I’d recommend checking the chipset first…
Most likely you have used a USB-serial adapter in Windows. When installed It appears as a COM port, you point TeraTerm or HyperTerminal to that COM port and everything automagically works. In Continue reading
For best article visual quality, open BeagleBone Black replaced Raspberry PI running networkgeekstuff.com (and performance reasons review) directly at NetworkGeekStuff.
With Raspberry PI, a very great microPC platform that started a trend of its own with two million RasberyPIs sold, a new market has emerged calling for microPC segment companies to compete. One of such alternative companies is BeagleBone and their very nice product is BeagleBone Black. So in this article, I would like to present the BeagleBone Black with some quick view on its abilities and because one BeagleBone Black has arrived to me a while ago, I can compare it with my older Raspberries. And most importantly, why the performance was so good that this web has moved to BeagleBone Black and abandoned Raspberries (while old Raspberries are now only as cold backup).
BeagleBone Black now runs networkgeekstuff.com
If you remember from my previous blogposts, RasberryPI is a platform on which actually this webserver is running during writing of this article (and you can read about building web server load-balanced on two RasberryPIs on in my previous tutorial articles). So I really found myself a useful work for my RaspberryPIs and I am from that point very Continue reading
Perceived benefits propelling adoption but management issues worry service providers
MPLS/SDN 2013 International Conference, WASHINGTON, D.C. – Nov. 20, 2013 – Network service providers are buying into software defined networking (SDN) benefits but are troubled by the management challenges, according to a survey conducted by Packet Design yesterday. More than 100 organizations – nearly half comprised of service providers – weighed in on SDN adoption, business drivers, and concerns during the 16th annual MPLS/SDN International Conference in Washington, D.C.
Nearly All Examining or Deploying SDN
Almost 90 percent of organizations surveyed are exploring SDN in some way, with:
Only 11 percent said they have no current SDN plans.
Main Drivers Include New Services, Business Agility
Nearly half of survey respondents (43 percent) said the main business driver behind SDN in their organizations is supporting new services such as cloud, big data applications, and mobility. More than 26 percent consider increasing business agility (including responding faster to new network demands) the number one driver. Improving productivity (better network availability and performance for customers/users) Continue reading
Data Edge has launched a new telecoms performance management tool that it forecasts will bring in new revenues of €1.2m before the end of 2014. This includes a first contract just signed with a major telecommunications provider in Ireland worth €350,000. According to Data Edge, the management of network operations for telecommunications companies has become increasingly complicated. Constant network configuration changes, and the rollout and expansion of new services, have made complete network visibility extremely difficult. Data Edge therefore saw a gap in the market and teamed up with Packet Design to provide a solution for telecoms providers to improve network reporting, route visibility, analysis and diagnosis.
Data Edge has entered into an exclusive partnership with Packet Design to resell its product range in the Irish market. “To gain real insight into networks, engineers traditionally have had to query individual routers and manually correlate the resulting data, which is a tedious, error prone and time consuming process,” said Brian McBride, managing director, Data Edge. “SLA reporting, capacity planning, route visibility, fault finding, repairing and auditing are constant uphill struggles. Add cloud computing and virtualisation into the mix and these tasks become practically impossible. Operators told us they want a Continue reading
Using a few guides on the web and a little bit of ingenuity I was able to get my FTDI-based, USB to 2x Serial adapter working in Mac OSX 10.9 Mavericks with iTerm 2. This post documents the process and resources used in the hope of becoming the definitive guide to setting up a USB serial adapter in OSX and using iTerm2 as the terminal emulator. Even if it isn’t quite definitive, it should at least be useful to others - I hope!
[This post was written by Dinesh Dutt with help from Martin Casado. Dinesh is Chief Scientist at Cumulus Networks. Before that, he was a Cisco Fellow, working on various data center technologies from ASICs to protocols to RFCs. He’s a primary co-author on the TRILL RFC and the VxLAN draft at the IETF. Sudeep Goswami, Shrijeet Mukherjee, Teemu Koponen, Dmitri Kalintsev, and T. Sridhar provided useful feedback along the way.]
In light of the seismic shifts introduced by server and network virtualization, many questions pertaining to the role of end hosts and the networking subsystem have come to the fore. Of the many questions raised by network virtualization, a prominent one is this: what function does the physical network provide in network virtualization? This post considers this question through the lens of the end-to-end argument.
Networking and Modern Data Center Applications
There are a few primary lessons learnt from the large scale data centers run by companies such as Amazon, Google, Facebook and Microsoft. The first such lesson is that a physical network built on L3 with equal-cost multipathing (ECMP) is a good fit for the modern data center. These networks provide predictable latency, scale well, converge quickly when nodes or links change, and provide Continue reading