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Category Archives for "Networking"

BGP Persistent Oscillation

After Daniel Walton visited the History of Networking at the Network Collective, I went back and poked at BGP permanent route oscillations just to refresh my memory. Since I spent the time, I thought it was worth a post, with some observations. When working with networking problems, it is always wise to begin with a network, so…

For those who are interested, I’m pretty much following RFC3345 in this explanation.

There are two BGP route reflectors here, in two different clusters, labeled A and D. The metric for each link is listed on the links between the RR clients, B, C, and E, and the RRs; the cost of the link between the RRs is 1. A single route, 2001:db8:3e8:100::/64 is being advertised in with an AS path of the same length from three different eBGP peering points, each with a different MED. E is receiving the route with a MED of 0, C with a MED of 1, and B with a MED of 10.

Starting with A, walk through one cycle of the persistent oscillation. At A there are two routes—

edge MED IGP Cost
C    1   4
B    10  5 (BEST)

When A runs the bestpath calculation, Continue reading

AI and IoT: Like peanut butter and chocolate?

If you had to take a guess, what would you name as the two most prominent trends in technology right now? Like most people, I feel pretty confident in choosing artificial intelligence (AI) and the Internet of Things (IoT), not necessarily in that order.But in a rare convergence, in turns out these two trends are even hotter together. In fact, the new hotness is the combination of AI and IoT, manifesting itself in a wide variety of form and implementations in locations around the world.IBM’s Watson wants to bring ‘cognitive computing’ to IoT At IBM, for example, the company opened a Watson Internet of Things headquarters in Munich, Germany, earlier this year. The lab pairs IBM with partners such as BMW, Bosch and Ricoh. The goal, per the company’s Watson IoT website, is to marry cognitive computing (the Watson AI platform) to vast arrays of IoT sensors. The company quotes an IDC report that claims IBM and Watson “can demonstrate the power of cognitive analytics in the IoT."To read this article in full or to leave a comment, please click here

Worth Reading: Is it time to build an anti-DDoS alliance?

A functional “anti-DOS alliance” is only feasible if SP”s are ready to commit to specific frugal investments. These ‘ prudent commitments’ will not require millions of dollars in anti-DOS technology. The commitments will require a change of the SP’s attitude and approach to DOS. It moved from a model that “I’m island on my own” mentality to a model where the SP see their business, network, and services as part of a global interconnection system. This interconnected system requires security collaboration to push back against the DOS Storm that threatens their business. We can break this “change of attitude into three actionable changes which will Clear the Path for an SP anti-DOS alliance. —Barry Greene @Senki

The post Worth Reading: Is it time to build an anti-DDoS alliance? appeared first on rule 11 reader.

Demand for server specialists increases, but talent pool is small

Almost two-thirds of organizations surveyed say recruiting for jobs in data center and server management is becoming increasingly difficult because of the skills needed, both in traditional servers and converged infrastructure.The findings come from a worldwide survey by 451 Research for its Voice of the Enterprise: Servers and Converged Infrastructure, Organizational Dynamics study (registration required). It found that IT shops have concerns about the long-term costs of using public cloud, and that is causing many IT shops to pull back on their cloud movement and even expand on their on-premises infrastructure.To read this article in full or to leave a comment, please click here

Demand for server specialists increases, but talent pool is small

Almost two-thirds of organizations surveyed say recruiting for jobs in data center and server management is becoming increasingly difficult because of the skills needed, both in traditional servers and converged infrastructure.The findings come from a worldwide survey by 451 Research for its Voice of the Enterprise: Servers and Converged Infrastructure, Organizational Dynamics study (registration required). It found that IT shops have concerns about the long-term costs of using public cloud, and that is causing many IT shops to pull back on their cloud movement and even expand on their on-premises infrastructure.To read this article in full or to leave a comment, please click here

How to use the motd file to get Linux users to pay attention

It seems only decades ago that I was commonly sending out notices to my users by editing the /etc/motd file on the servers I managed. I would tell them about planned outages, system upgrades, new tools and who would be covering for me during my very rare vacations.Somewhere along the stretch of time since, message of the day files seem to have faded from common usage — maybe overwhelmed by an excess of system messages, emailed alerts, texts, and other notices that have taken over, the /etc/motd file has. Or maybe not.+ Also on Network World: Half a dozen clever Linux command line tricks + The truth is the /etc/motd file on quite a number of Linux systems has simply become part of a larger configuration of messages that are fed to users when they log in. And even if your /etc/motd file is empty or doesn’t exist at all, login messages are being delivered when someone logs into a server via a terminal window — and you have more control over what those messages are telling your users than you might realize.To read this article in full or to leave a comment, please click here

What is Attachment Circuit in MPLS VPN ?

What is attachment circuit in MPLS VPN ? Definitions are important in networking, if there are alternative usages of the definition, better to know them all for effective communication.   MPLS Layer 2 VPN Topology   In the above topology, I share, MPLS Layer 2 VPN Topology. There are many terminology but let’s focus on […]

The post What is Attachment Circuit in MPLS VPN ? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.

Hot products at VMworld 2017

VMworld 2017Image by Thinkstock/VMwareVMworld 2017 is underway in Las Vegas, where IT pros are converging to learn about the latest in enterprise cloud, virtualization, security, and software-defined data center technologies. Here are some of the product highlights on display at the show.To read this article in full or to leave a comment, please click here

Hot products at VMworld 2017

VMworld 2017Image by Thinkstock/VMwareVMworld 2017 is underway in Las Vegas, where IT pros are converging to learn about the latest in enterprise cloud, virtualization, security, and software-defined data center technologies. Here are some of the product highlights on display at the show.To read this article in full or to leave a comment, please click here

Hot products at VMworld 2017

VMworld 2017Image by Thinkstock/VMwareVMworld 2017 is underway in Las Vegas, where IT pros are converging to learn about the latest in enterprise cloud, virtualization, security, and software-defined data center technologies. Here are some of the product highlights on display at the show.To read this article in full or to leave a comment, please click here

How I’ve Attempted to Blog More in 2017

This post has been sitting in the “drafts” folder for a while now. Clearly, since it’s August and is therefore a little late to be deciding on a plan that is supposed to carry through all 12 months of 2017. Regardless, I think it’s still worth sharing how I’ve attempted to increase the frequency of my blogging. My basic goal for 2017 is:

Create more content in 12 months than I ever have before in order to a) significantly build up the depth and breadth of knowledge on my blog, b) increase my skills as a writer, and c) continue to build this blog and the readership as a key part of my online persona and brand.

In order to achieve this goal, I’ve identified a couple of tactical objectives:

  1. Reduce the friction between me and the keyboard; make it possible to “just write”.
  2. Be able to “just write” anywhere. At home. On vacation. In a waiting room. On an airplane. I should also be able to start a post in one location and pick it up again in another. Indirectly this means I need to be able to write on any of my computers or mobile devices.

In order Continue reading

VMware embraces cloud during VMWorld, CEO Gelsinger says

(In the run-up to VMWorld this week, VMware CEO Pat Gelsinger spoke to IDG Enterprise Editor-in-Chief Eric Knorr about announcements at the conference, the future of the company and his five-year tenure at the helm. This is a summary of some of the highlights of that interview.)As VMware opens up its user conference this week in Las Vegas, the company’s CEO Pat Gelsinger says it is making significant announcements about cloud integration and security.To read this article in full or to leave a comment, please click here

VMware embraces cloud during VMWorld, CEO Gelsinger says

(In the run-up to VMWorld this week, VMware CEO Pat Gelsinger spoke to IDG Enterprise Editor-in-Chief Eric Knorr about announcements at the conference, the future of the company and his five-year tenure at the helm. This is a summary of some of the highlights of that interview.)As VMware opens up its user conference this week in Las Vegas, the company’s CEO Pat Gelsinger says it is making significant announcements about cloud integration and security.To read this article in full or to leave a comment, please click here

Palo-Alto Firewalls Category IV

In my previous article I wrote about the Category I, II, III firewalls with features, capabilities and other functions. You can go through the article again on the below mentioned links as

Palo-Alto Firewalls Category I firewalls
Palo-Alto Firewalls Category II
Palo-Alto Firewalls Category III

Now after Category I, Lets talk about the category II firewalls now. As i earlier divide the firewalls in the categories, so below are the Category II firewalls 

Catagory-IV
In the Virtual Firewall appliances we have VM-50; VM-100/200; VM-300/VM-1000HV; VM-500 and VM-700 models.


We will have the discussion in the same features which I discussed in Category I, Category II and Category III firewalls and the features are 

  • Throughput of the firewalls
  • Threat Preventions capabilities
  • IPSEC VPN throughput
  • CPU configuration supported
  • New Sessions per seconds
  • Dedicated Memory
  • Dedicated disk drive
  • VMware Support
  • NSX Manager support
  • Citrix Xen Server support
  • Amazon AWS support
  • Microsoft Azure support
Below is the table showing all the capabilities of the Category IV firewalls. Please click on the image for more clarity.

Fig 1.1- Palo Alto Firewalls- Category IV




1 … 1,618 1,619 1,620 1,621 1,622 … 3,419