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Category Archives for "Networking"

App Highlight: Hardenize

Hardenize is a comprehensive security tool that continuously monitors the security and configuration of your domain name, email, and website. Ivan Ristić, the author of Hardenize, gave a demo of his app at our Cloudflare London HQ.



Do you know how secure your site is? View a Hardenize report on your website by clicking this button:



Interested in sharing a demo of your app at a meetup? We can help coordinate. Drop a line to [email protected].

Broken packets: IP fragmentation is flawed

As opposed to the public telephone network, the internet has a Packet Switched design. But just how big can these packets be?

CC BY 2.0 image by ajmexico, inspired by

This is an old question and the IPv4 RFCs answer it pretty clearly. The idea was to split the problem into two separate concerns:

  • What is the maximum packet size that can be handled by operating systems on both ends?

  • What is the maximum permitted datagram size that can be safely pushed through the physical connections between the hosts?

When a packet is too big for a physical link, an intermediate router might chop it into multiple smaller datagrams in order to make it fit. This process is called "forward" IP fragmentation and the smaller datagrams are called IP fragments1.

Image by Geoff Huston, reproduced with permission

The IPv4 specification defines the minimal requirements. From the RFC791:

Every internet destination must be able to receive a datagram
of 576 octets either in one piece or in fragments to
be reassembled. [...]

Every internet module must be able to forward a datagram of 68
octets without further fragmentation. [...]

The first value - Continue reading

Got my number!

After a week of waiting (why this is taking so long? this wasn’t a particularly pleasant week), I finally got my number.

Brand new JNCIE-DC #31 !!!

The main note about the lab – time management is the most important thing on the exam. Don’t rush to the keyboard, read and understand all the tasks and it’s interdependencies. Have a plan regarding order of tasks – not all tasks can be completed in order in which they written. Don’t be affraid to skip some tasks if it takes a long time.

I am quite pleased with the level of my preparation for the lab – there were no unexpected or incomprehensible tasks. General feeling about JNCIE-DC lab – this is interesting, pretty complex but fair exam. Lot of tasks on various themes, I think all themes from blueprint are covered in the lab in some ways.

As the proctor told me, the main difficulty of this exam is that it’s something new, and people are afraid of a new and unexpected. I want to tell you – don’t be afraid! If you’re interested in learning a Juniper way of building Data Center networks, and also want to earn one more pretty Continue reading

Automating Documentation

Tedium is the enemy of productivity. The fastest way for a task to not be done is to make it long, boring, and somewhat complicated. People who feel that something is tedious or repetitive are the ones more likely to marginalize a task. And I think I speak for the entire industry when I say that there is no task more tedious and boring than documentation. So how can we fix it?

Tell Me What You Did

I’m not a huge fan of documentation. When I decide on a plan of action, I rarely write it down step-by-step unless I’m trying to train someone. Even then, it looks more like notes with keywords instead of a narrative to follow. It’s a habit that has been borne out of years of firefighting in networks and calls to “do it faster”. The essential items of a task are refined and reduced until all that remains is the work and none of the ancillary items, like documentation.

Based on my previous life as a network engineer, I can honestly say that I’m not alone in this either. My old company made lots of money doing network discovery engagements. Sometimes these came because the Continue reading

Microsoft acquires cloud-based HPC developer

Microsoft pulled off a big get with its acquisition of Cycle Computing, the developer of a suite of high-performance computing (HPC) services called CycleCloud for cloud orchestration, provisioning and data management in the cloud.You may not know its name but Cycle Computing is actually a major player. In 2012, it helped Amazon create the first massive cloud-based supercomputer, spanning 51,000 cores. For just one hour of run time, the bill was $5,000.+ Also on Network World: Azure Stack: Microsoft’s private-cloud platform and what IT pros need to know about it + In 2013, Cycle Computing hit its biggest cloud run, creating a cluster of 156,314 cores with a theoretical peak speed of 1.21 petaflops that ran for 18 hours and spanned Amazon data centers around the world. The bill for that monstrosity was $33,000. To read this article in full or to leave a comment, please click here

Microsoft acquires cloud-based HPC developer

Microsoft pulled off a big get with its acquisition of Cycle Computing, the developer of a suite of high-performance computing (HPC) services called CycleCloud for cloud orchestration, provisioning and data management in the cloud.You may not know its name but Cycle Computing is actually a major player. In 2012, it helped Amazon create the first massive cloud-based supercomputer, spanning 51,000 cores. For just one hour of run time, the bill was $5,000.+ Also on Network World: Azure Stack: Microsoft’s private-cloud platform and what IT pros need to know about it + In 2013, Cycle Computing hit its biggest cloud run, creating a cluster of 156,314 cores with a theoretical peak speed of 1.21 petaflops that ran for 18 hours and spanned Amazon data centers around the world. The bill for that monstrosity was $33,000. To read this article in full or to leave a comment, please click here

Microsoft acquires cloud-based HPC developer

Microsoft pulled off a big get with its acquisition of Cycle Computing, the developer of a suite of high-performance computing (HPC) services called CycleCloud for cloud orchestration, provisioning and data management in the cloud.You may not know its name but Cycle Computing is actually a major player. In 2012, it helped Amazon create the first massive cloud-based supercomputer, spanning 51,000 cores. For just one hour of run time, the bill was $5,000.+ Also on Network World: Azure Stack: Microsoft’s private-cloud platform and what IT pros need to know about it + In 2013, Cycle Computing hit its biggest cloud run, creating a cluster of 156,314 cores with a theoretical peak speed of 1.21 petaflops that ran for 18 hours and spanned Amazon data centers around the world. The bill for that monstrosity was $33,000. To read this article in full or to leave a comment, please click here

Microsoft acquires cloud-based HPC developer

Microsoft pulled off a big get with its acquisition of Cycle Computing, the developer of a suite of high-performance computing (HPC) services called CycleCloud for cloud orchestration, provisioning and data management in the cloud.You may not know its name but Cycle Computing is actually a major player. In 2012, it helped Amazon create the first massive cloud-based supercomputer, spanning 51,000 cores. For just one hour of run time, the bill was $5,000.+ Also on Network World: Azure Stack: Microsoft’s private-cloud platform and what IT pros need to know about it + In 2013, Cycle Computing hit its biggest cloud run, creating a cluster of 156,314 cores with a theoretical peak speed of 1.21 petaflops that ran for 18 hours and spanned Amazon data centers around the world. The bill for that monstrosity was $33,000. To read this article in full or to leave a comment, please click here

63% off Anker SoundCore 2 Bluetooth Speaker with 24-Hour Playtime – Deal Alert

SoundCore 2 From Anker produces outstanding audio from an astonishingly compact speaker. Upgraded 2x 6W drivers blast out rich, clear sound. IPX5 water-resistant rating and dustproof engineering mean you can bring your beats anywhere - from the garden, to the beach. Upgraded materials provide smooth touch, and better grip. Listen for up to 66ft with latest Bluetooth 4.2 technology, while an in-built microphone makes hands-free calling a breeze. If you find yourself without BlueTooth, an aux port allows you to plug in and play. And a 24-hour / 500-song playtime means you can listen all day. The SoundCore 2 from Anker's typical list price has been reduced 63% to just $33.59. See this deal on Amazon.To read this article in full or to leave a comment, please click here

63% off Anker SoundCore 2 Bluetooth Speaker with 24-Hour Playtime – Deal Alert

SoundCore 2 From Anker produces outstanding audio from an astonishingly compact speaker. Upgraded 2x 6W drivers blast out rich, clear sound. IPX5 water-resistant rating and dustproof engineering mean you can bring your beats anywhere - from the garden, to the beach. Upgraded materials provide smooth touch, and better grip. Listen for up to 66ft with latest Bluetooth 4.2 technology, while an in-built microphone makes hands-free calling a breeze. If you find yourself without BlueTooth, an aux port allows you to plug in and play. And a 24-hour / 500-song playtime means you can listen all day. The SoundCore 2 from Anker's typical list price has been reduced 63% to just $33.59. See this deal on Amazon.To read this article in full or to leave a comment, please click here

Network Interconnections Video by Orhan Ergun

Network Interconnections is one of the most important topics for the operator network as it directly related with the cost of the sending traffic out from their networks.   I published a network interconnection video on my Facebook page. I explain the peering types, settlement free peering , paid peering , remote peering , IP […]

The post Network Interconnections Video by Orhan Ergun appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.

IDG Contributor Network: Can the US Senate secure the Internet Of Things?

As a free and open internet continues to come under assault by the FCC’s proposal to effectively end net neutrality, investors, programmers, and internet-users of all stripes have vociferously voiced their support of the Internet of Things and the open web that enables it. It appears those voices have been heard, as the US Senate may be taking steps to secure the Internet of Things’ future.So what exactly is the senate up to, and how might its actions impact the health of the Internet of Things? What are the specifics of the bill in question, and how might its text impact American’s everyday lives as they make use of the IoT?A hopeful bill A new bipartisan bill published Tuesday by Sen. Mark Warner and Sen. Cory Gardner, the Internet of Things Cybersecurity Improvement Act of 2017, hopes to beef up America’s internet security. The bill highlights the enormous complexity of the IoT and the huge benefits it provides to the American economy, but also notes the fragility and vulnerability of the system to outside attacks.To read this article in full or to leave a comment, please click here