[minipost] Create a loopback hard-drive partition inside a file in linux

For best article visual quality, open [minipost] Create a loopback hard-drive partition inside a file in linux directly at NetworkGeekStuff.

TuxTIP_mergedThis article is really just a quick documentation for something that I do almost each year, and each year I must google-search how I did the last time. So from now on I will have it in my own notes …. here!

Mu current problem was that I have VPS system from a small provider hpcloud.com :) , but the base image is divided to 10 GB of system partition and another 20 GB of data partition. And as luck would have it, I needed 25 GB for data. One of the options was to buy more storage, but I have seen that my minimalistic debian hardly used more than 1,7 GB from the 10 GB system space and I wanted to make use of the remaining space.

Additionally, resizing the partition was not an option as this was the provider mandatory separation, so I decided to use a loopback file emulating a hard-drive.

What this means is that I will create a 5 GB file in the system partition, and mount it as a directory in the data partition, Continue reading

ArmA2 CWR2 mod: Winter Kolgujev + Malden Domination with Xmas extras

For best article visual quality, open ArmA2 CWR2 mod: Winter Kolgujev + Malden Domination with Xmas extras directly at NetworkGeekStuff.

Last year, I released quickly one nice modification to my custom Malden CWR2 Domination and despite being only announced really only on this blog and to few of my friends last year, I really enjoyed creating it. So this year I decided to put off some dust from it and also port it to a fully winter themed island of Winter Kolgujev from the latest CWR2 mod. Again, this is based on Xeno’s Domination and original port to Everon by OC, then customized on a scripting level with multiple features.

ThumbnailWinter

Features:

Christmas/Winter centric features:

  • Permanent SNOW FALL + FOG during the mission to have a deep atmosphere + in Malden also custom environment sounds, that is why the file is a bit bigger.
  • All CWR2 infantry units are using Winter camouflage (see pictures below, great work from CWR2 mod team to release this)
  • There are Christmas presents under a tree for your team, but be careful, if you fail to protect some girls in the base, you will loose the presents.
  • Custom Christmas carol music in intro + if you Continue reading

Hardware – Is SFP+ just a smaller version of XFP?

In the last post I discussed clock and data recovery (CDR). This post examines an application of re-timers (or CDRs) within XFP and SFP+ transceivers. I’ve previously covered the size, power and connector differences of 10G transceivers before, but this post will focus … Continue reading →

The post Hardware – Is SFP+ just a smaller version of XFP? appeared first on The Network Sherpa.

Project DEW

I don't want to claim myself as Global Consultant anymore. It seems like many people have problem with that. Some called me showing off, some said I'm too proud with that title. Others even said I spent so much time marketing myself. Blah blah. Ok, ok, I get it.

But here is the fact: since I joined Cisco in 2006 I've traveled to many countries to do consulting projects. Below you can see some Cisco customers in Asia, Europe, Middle East and Africa that I worked with in the past. And most of the time my role in the project is to lead the design work: to capture customer requirements and provide technical solution to address them. In many projects I also lead the implementation and migration. For some projects I'm responsible to lead the whole engagement from project scheduling, managing resources as well as quality assurance for deliverables. So call me anything you want, even Janitor, but it seems like I have some experiences working on design consultancy project, globally.


And actually before I joined Cisco I had already done many design project as well with many customers. I invented my own methodology and workflow for design work. Continue reading

Make sure you patch your holiday gifts

Let me start off with a question, what are the steps involved when it comes to giving someone a gift? Is it as simple as buy, wrap and handover? For the more traditional gifts like perfume this would be the correct answer but if you are giving electronic gifts then you may be leaving out […]

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Darragh Delaney

Technical Director at NetFort

Darragh Delaney is head of technical services at NetFort. As Director of Technical Services and Customer Support, he interacts on a daily basis with NetFort customers and is responsible for the delivery of a high quality technical and customer support service.

Darragh has extensive experience in the IT industry, having previously worked for O2 and Tyco. His User and Network Forensics blog. for Computer World focuses his experiences of network management and IT security in the real world. In his current role Darragh is regularly on site with network administrators and managers and this blog is a window into the real world of keeping networks running and data assets secure.

He shares network security and management best practices on the NetFort blog. Follow Darragh on Twitter @darraghdelaney and NetFort Technologies @netfort. You can also contact him Continue reading

OpenFlow/SDN Won’t Scale?

I got in a conversation today on Twitter, talking about SDN/SDF (software defined forwarding), which is a new term I totally made up which I use to describe the programmatic and centralized control of forwarding tables on switches and multi-layer switches. The comment was made that OpenFlow in particular won’t scale, which reminded me of an article by Doug Gourlay of Arista talking about scalability issues with OpenFlow.

The argument that Doug Gourlay of Arista had is essentially that OpenFlow can’t keep up with the number of new flows in a network (check out points 2 and 3). In a given data center, there would be tens of thousands (or millions or tens of millions) of individual flows running through a network at any given moment. And by flows, I mean keeping track of stateful TCP connection or UDP pseudo-flows. The connection rate would also be pretty high if you’re talking dozens or hundreds of VMs, all taking in new connections. 

My answer is that yeah, if you’re going to try to put the state of every TCP connection and UDP flow into the network operating system and into the forwarding tables of the devices, that’s Continue reading

Video Series Examines SDN: The Good, the Bad, & the Ugly

Leading industry analyst and Packet Design CTO discuss all facets of SDN in short video casts

What’s the reality on the ground with software defined networking (SDN)? Are humans in the network becoming obsolete? What network management best practices can we bring to the automation realm? Packet Design has released a wide-ranging conversation on these topics and more between Jim Frey, vice president of research for analyst firm Enterprise Management Associates, and Cengiz Alaettinoglu, CTO of Packet Design. Titled “SDN: The Good, the Bad & the Ugly,” the series consists of seven short videocasts where both experts provide an overview of SDN, related technologies, standards initiatives, and management considerations.


 SDN Video Series Segments:

  1. Defining SDN: What is it exactly and how does it differ from “software derived networking” and “network function virtualization?”

  2. SDN Standards Bodies & Consortia: Who is actively working on SDN and which segment is lagging?

  3. What’s Working and What’s Not: What are the risks with SDN? Is Google’s success with their custom-built SDN a model for the industry?

  4. The Need for a Network Access Broker (NAB): How do we determine if an application deployed via SDN will not adversely impact other applications?

  5. Use Cases for the Network Access Broker: Continue reading

Switching to Linux for… Switches?

Like many folks out there, I’m following the rise of “whitebox switching”, and am interested to see if (and where) it takes off. There’s many players out there who are trying to pitch disassociating the software from the hardware, and quite a few hardware manufacturers that are offering various hardware platforms on which to run […]

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Will Dennis

Will Dennis

Will Dennis has been a systems and network administrator since 1989, and is currently the Network Administrator for NEC Laboratories America, located in Princeton NJ. He enjoys the constant learning it takes to keep up with the field of network and systems administration, and is currently pursuing the Cisco CCNP-R/S certification. He can be found on the Twitters as @willarddennis, and on Google Plus.

The post Switching to Linux for… Switches? appeared first on Packet Pushers Podcast and was written by Will Dennis.

Podcast Planning – Got A Great Network Down Story?

Greg and I want to record a “Nightmare Before Christmas” podcast, where folks come on and tell us their most grisly, horrifying network down story. The idea is a relaxed show chatting around the holiday fire, telling war stories, and being glad it’s all over now. So…got a good story? Want to come on a […]

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Ethan Banks

Co-host at Packet Pushers

Ethan Banks, CCIE #20655, has been managing networks for higher ed, government, financials and high tech since 1995. Ethan co-hosts the Packet Pushers Podcast, which has seen over 2M downloads and reaches over 10K listeners. With whatever time is left, Ethan writes for fun & profit, studies for certifications, and enjoys science fiction. @ecbanks
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The post Podcast Planning – Got A Great Network Down Story? appeared first on Packet Pushers Podcast and was written by Ethan Banks.

Show 172 – Palo Alto Networks Next-Generation Security In The Data Center – Sponsored

It’s an exciting time to be a networking geek, with the introduction of new technologies like network virtualization and established vendors like Cisco jumping into the SDN market. But, what about network security? What happens when you move from traditional data center architectures to virtualization, cloud and SDN environments? Palo Alto Networks builds a next-generation […]

Author information

Ethan Banks

Co-host at Packet Pushers

Ethan Banks, CCIE #20655, has been managing networks for higher ed, government, financials and high tech since 1995. Ethan co-hosts the Packet Pushers Podcast, which has seen over 2M downloads and reaches over 10K listeners. With whatever time is left, Ethan writes for fun & profit, studies for certifications, and enjoys science fiction. @ecbanks
TwitterGoogle+LinkedIn

The post Show 172 – Palo Alto Networks Next-Generation Security In The Data Center – Sponsored appeared first on Packet Pushers Podcast and was written by Ethan Banks.

F5 drops LAB VE price to $95

During a recent F5 purchase I wanted to get some more F5 lab virtual edition appliances. At my company we have had two and it has been invaluable for testing new configs and training junior engineers in a safe environment that could be trashed and restored at will. At the time we ordered the lab […]

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Eric Flores

Eric Flores

Eric is a senior network engineer for a major real estate company. He has seven years in the field and has a passion for anything related to technology. Find him on Twitter @nerdoftech.
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The post F5 drops LAB VE price to $95 appeared first on Packet Pushers Podcast and was written by Eric Flores.

Default CoS Value in Netapp Cluster Mode

I was troubleshooting an MTU related issue for NFS connectivity in a Flexpod (Cisco UCS, Cisco Nexus, and Netapp storage with VMware vSphere, running the Nexus 1000v). Regular-sized frames were making it through, but not jumbo frames. I ensured the endpoints were set up correctly, then moved inwards….in my experience, the problem is usually there. The original design basically included the use of CoS tag 2 for all NFS traffic, so that it could be honored throughout the network, and given jumbo frames treatment.

Default CoS Value in Netapp Cluster Mode

I was troubleshooting an MTU related issue for NFS connectivity in a Flexpod (Cisco UCS, Cisco Nexus, and Netapp storage with VMware vSphere, running the Nexus 1000v). Regular-sized frames were making it through, but not jumbo frames. I ensured the endpoints were set up correctly, then moved inwards….in my experience, the problem is usually there. The original design basically included the use of CoS tag 2 for all NFS traffic, so that it could be honored throughout the network, and given jumbo frames treatment.

Superman, Immortal, Janitor

"What's the difference between Solutions Architect and Technical Leader?"

Someone asked me that question last week. We all know the answer: none. It's just a damn title. Title doesn't matter. It never does. Batman once said: it's not who you are underneath, it's what you do that defines you.


In my current organization, that focuses on consulting services, there is a distinction between Solutions Architect and Technical Leader role in career path for technical person. (Himawan, but you said there is no such thing as career path? Well, let's save the debate for some other time).

As seen in below figure, Network Consulting Engineers (NCE) make progress from level I to level IV, and this is the point where he/she can make decision: either to stick as NCE then becomes Technical Leader someday, or to move to become Solutions Architect. He/she can actually move to any other position across the organization like pre-sales consultant or project manager or business development manager or even accountant! But let's keep the discussion between the path of Technical Leader and Solutions Architect.


So what's the difference between the two then?

Both must have excellent soft skills: communicate effectively, above average presentation skills, team Continue reading

MITM and Routing Security

If the motivation behind the effort behind securing BGP was to allow any BGP speaker to distinguish between routing updates that contained “genuine” routing information and routing updates that contained contrived or false information, then these two reports point out that we’ve fallen short of that target. What’s gone wrong? Why are certain forms of routing Man-In-The-Middle attacks all but undetectable for the RPKI-enabled BGPSEC framework?
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