May 24, 2016

My Etherealmind

Response: Fibre Optic Multi-Core per Core Is Exciting

This article has opened my eyes to a future where a single fibre cable can have multiple cores. The future of Ethernet is yet to be determined as the IEEE community fights over whose technology patents will be used so that revenue from FRAND licensing can justify their own positions. So while we wait for […]

The post Response: Fibre Optic Multi-Core per Core Is Exciting appeared first on EtherealMind.

by Greg Ferro at May 24, 2016 10:51 AM

May 23, 2016

Networking Now (Juniper Blog)

More on Ransomware

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2016 is shaping up to be the year of ransomware. In addition to Locky, we’ve seen TeslaCrypt, 7ev3n, 7ev3n-HONE$T, a failed Locky clone, Petya, Rokku, Jigsaw, and many more. Hospitals and medical centers have been hit by ransomware, including the SamSam variant that targets vulnerable JBoss servers. In this post, we’ll look at some recent ransomware samples and how Sky ATP handles these threats.

by AsherLangton at May 23, 2016 11:06 PM

My Etherealmind

Blessay: Proof of Concept Testing Should Never Happen

Its “best practice” to assume that IT vendor products are faulty, have serious bugs and will fail in normal operation at anytime.

The post Blessay: Proof of Concept Testing Should Never Happen appeared first on EtherealMind.

by Greg Ferro at May 23, 2016 06:45 PM

Network Design and Architecture

EIGRP Feasible Successor

One of the advantages of EIGRP Feasible Successor is that it speeds up the EIGRP. In fact, if there is a Feasible Successor in the EIGRP network, such network converges faster than OSPF or IS-IS. But what is EIGRP Feasible Successor and how can we find EIGRP Feasible Successor? Or, if there is EIGRP Feasible […]

The post EIGRP Feasible Successor appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.

by Orhan Ergun at May 23, 2016 12:50 PM

XKCD Comics

May 21, 2016

Network Design and Architecture

PIM Sparse Mode Vs PIM SSM

One of my students asked me this question a month ago. “What is the difference between PIM Sparse Mode and PIM SSM (Source Specific Multicast)?” But, since I had two CCDE bootcamps in one month, I didn’t have time to answer the question on this platform. By the way I have seen this mis understanding […]

The post PIM Sparse Mode Vs PIM SSM appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.

by Orhan Ergun at May 21, 2016 10:22 AM

May 20, 2016

Network Design and Architecture

What is VLAN Load Balancing?

In layer 2 switching, the Ethernet frames should be received from the same port where it was sent, otherwise layer 2 switching or switching loop occurs. Let me explain this concept with the topology depicted below (Figure -1). . Figure -1 VLAN load balancing In the above figure, either Port 1 or Port2 is used […]

The post What is VLAN Load Balancing? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.

by Orhan Ergun at May 20, 2016 09:20 AM

My Etherealmind

Cisco Nexus 6000 is EOL

Cisco has killed the Nexus 6000 product line and you have 12 months to get your last orders in. This is long overdue. I’ve never understood why Cisco has so many different different Ethernet switch products that are effectively identical. The impact of merchant silicon and the success of the Nexus 9000 product overshadowed this […]

The post Cisco Nexus 6000 is EOL appeared first on EtherealMind.

by Greg Ferro at May 20, 2016 09:19 AM

Networking Now (Juniper Blog)

“Indistinguishability Obfuscation” And Malware Detection

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Recent breakthroughs in cryptography, widely reported on in the media showed that it is possible to reassemble any given program into a mathematical jigsaw puzzle so complicated that, although it functions identically to the original, divining its purpose without running it is effectively impossible. We’ll look at the security implications of these findings.

by rsinayev at May 20, 2016 07:25 AM

XKCD Comics

May 19, 2016

Internetwork Expert Blog

Congrats to Neil Moore – **NINE TIME** CCIE & CCDE!

Congratulations to Neil Moore on passing the CCDE Practical Exam this week, and becoming a NONTUPLE (9x) CCIE & CCDE!

Neil was a student in both my CCIE Data Center Bootcamp and CCDE Bootcamp within the past few years, and is truly an inspiration to us all. Neil’s brother Kelly is also a CCIE in Data Center. Neil likes to introduce himself and his brother to people at Cisco Live that they have 9 CCIEs between the two of them! ;) This year Neil gets to bump that up to 10 CCIEs and CCDE between the two of them!

Neil for sure will win the longest badge this year at Cisco Live 2016 Las Vegas!

Neil currently works for VMWare as an NSX Systems Engineer, is a VMware Certified Implementation Expert — Network Virtualization (VCIX-NV), and has plans to pursue the VMware Certified Design Expert (VCDX).

Congrats Neil!

by Brian McGahan, CCIE #8593, CCDE #2013::13 at May 19, 2016 02:47 PM

Network Design and Architecture

What is DFZ (Default Free Zone)?

In the context of the Internet and BGP routing, DFZ – commonly known as Default Free Zone – refers to the collections of all the public IPv4 BGP prefixes without default route on the global Internet. Most of the time, you hear full-route or full-Internet-route terms which are the same with Default Free Zone term. Having all BGP routes, […]

The post What is DFZ (Default Free Zone)? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.

by Orhan Ergun at May 19, 2016 12:51 PM

May 18, 2016

Network Design and Architecture

Great Cisco CCDE Achievement

Cisco CCDE Achievement  Congratulations, Martin J Duggan, for being among one of the three people who passed the May 2016 CCDE Practical Exam. Your hard work has truly paid off not only because you attended my class, but, also because you put in your efforts to make this dream of yours a reality. You have […]

The post Great Cisco CCDE Achievement appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.

by Orhan Ergun at May 18, 2016 07:33 AM

FirstDigest

Draw network diagrams online [2016 Edition]

In this post from 2011 I was explaining that my preferred online tool to draw network diagrams is LucidChart.com. Since then LucidChart.com developed really good and added constantly new features. Unfortunately with the new great additions some not so nice

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by Calin at May 18, 2016 06:11 AM

Potaroo blog

Fragmenting IPv6

The design of IPv6 represented a relatively conservative evolutionary step of the Internet protocol. Mostly, it's just IPv4 with significantly larger address fields. Mostly, but not completely, as there were some changes. IPv6 changed the boot process to use auto-configuration and multicast to perform functions that were performed by ARP and DHCP in IPv4. IPv6 added a 20-bit Flow Identifier to the packet header. IPv6 replaced IP header options with an optional chain of extension headers. IPv6 also changed the behaviour of packet fragmentation. Which is what we will look at here.

May 18, 2016 06:00 AM

XKCD Comics

May 17, 2016

SNOsoft Research Team
Networking Now (Juniper Blog)

Making FinFisher Spyware Undetectable

Governments use malware to spy on journalists.  In this article we will show how to make one such malware undetectable by antivirus programs.

by rsinayev at May 17, 2016 05:29 PM

Malware Detection and Antivirus Signatures

Static analysis methods and signature-based detection in particular has been the bread and butter strategy for malware detection, because it allows for quick and painless detection and virus identification. Let's talk about how signature-based detection works.

 

by rsinayev at May 17, 2016 04:46 PM

May 16, 2016

XKCD Comics

May 14, 2016

FirstDigest

Cisco ASA packet capture showing bidirectional traffic flow

Recently I had to troubleshoot some communication issues via a Cisco ASA device and the packet capture on the IOS comes in handy for this task. When you have a lot of traffic over ASA and you’re interested in a

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by Calin at May 14, 2016 10:59 PM