Review: 4 open-source network management tools improve usability, performance

Network management tools have come a long way from the early command-line products with arcane, text-based configuration files that kept everyone except the resident (typically Linux) guru in the dark. Today’s management tools, replete with desktop or web-based GUIs, easy installs and configuration wizards, are far more accessible. With each iteration vendors find ways to make these tools more powerful and easier to use. For this review, we evaluated newer versions of three established open-source network management products – OpenNMS, Zenoss Core and NetXMS – as well as a relative newcomer, Sensu Core. All four products are free and open source.To read this article in full, please click here

Review: 4 open-source network management tools improve usability, performance

Network management tools have come a long way from the early command-line products with arcane, text-based configuration files that kept everyone except the resident (typically Linux) guru in the dark. Today’s management tools, replete with desktop or web-based GUIs, easy installs and configuration wizards, are far more accessible. With each iteration vendors find ways to make these tools more powerful and easier to use. For this review, we evaluated newer versions of three established open-source network management products – OpenNMS, Zenoss Core and NetXMS – as well as a relative newcomer, Sensu Core. All four products are free and open source.To read this article in full, please click here

IoT roundup: Security problems galore and a way to track urinary infections

The two things everybody knows about IoT are that A, its use is growing at a pretty spectacular rate, encompassing use cases from the most frivolous of consumer gadgetry to the most heavy-duty of industrial machinery, and B, it is, as a consequence, a gloriously tempting target for malicious hackers.News related to point B has been making headlines lately, including the results of a study from Gemalto, which found that roughly half of all companies using IoT didn’t even have the basic ability to detect outside interference or hacking on their devices. That is, in a word, bad.To read this article in full, please click here

Cannot connect the virtual device … because no corresponding device is available on the host

Recently I've been building some VM templates on my MacBook and launching instances of them in VMware. Each time it produced following error:

Cannot connect the virtual device sata0:1 because no corresponding device is available on the host.


Either button caused the guest to boot up. The "No" button ensured that it booted without error on subsequent reboots, while choosing "Yes" allowed me to enjoy the error with each power-on of the guest.

Sata0 is, of course a (virtual) disk controller, and device 1 is an optical drive. I knew that much, but the exact meaning of the error wasn't clear to me, and googling didn't lead to a great explanation.

I wasn't expecting there to be a "corresponding device ... available on the host" because the host has neither a SATA controller nor an optical drive, and no such hardware should be required for my use case, so, what did the error mean?

It turns out that I was producing the template (a .ova file) with the optical drive "connected" (VMware term) to ... something. The issue isn't related to the lack of a device on the host, but that there's no ISO file "inserted" into the virtual drive.

Here's the Continue reading

When Metaphors Fail

We often use metaphors to describe a particular part of a thing or the thing itself. For instance, we might say “I’m as hungry as a horse,” to describe how much we think we could eat (although a more appropriate saying might be “as hungry as a bird,” as it turns out!). Network operators and engineers are no exception to this making of metaphors, of course.

Metaphors have a reductionistic tendency. For instance, when saying I am as hungry as a horse, I am relating the amount of food a horse might eat to the amount of food I feel like eating. The metaphor reduces the entire person and the entire horse so the turn on a single point—a quantity of food. In using this kind of comparison, I am not claiming to have the same number of legs as a horse, or perhaps a swishing tail like a horse.

The danger in using a metaphor is that you can take the part to be the whole. When this happens, the metaphor says things it should not say, and can cause us to misunderstand the scope, complexity, or solution to a problem. For some reason, we tend to do Continue reading

LDP Multipath/ECMP

In one of our last posts on MPLS – we showed how LDP can be used to dynamically exchange labels between MPLS enabled routers. This was a huge improvement from statically configured LSPs. We saw that LDP was tightly coupled to the underlying IGP but we didn’t spend a lot of time showing examples of that. In this post, I want to extend our lab a little bit to show you exactly how tightly this coupling is. To do so, we’ll use part of the extended lab that we created at the end of our last post on the JunOS routing table. For the sake of being thorough, we’ll provide the entire configuration of each device. The lab will look like what’s shown below…

For a base configuration – we’re going to start with mostly everything there with the exception of MPLS and LDP. We’ll then add that in stages so we can see how things look before and after we have multiple IGP paths to the same destination…

vMX1 Configuration…

system {
    host-name vmx1.lab;
}
interfaces {
    ge-0/0/0 {
        unit 0 {
            family inet {
                address 10.2.2.0/31;
            }
        }
    }
    ge-0/0/1 {
        unit 0 {
             Continue reading

Tech Bytes: Understanding Cisco’s Smart Net Total Care (Sponsored)

On today's Tech Bytes, sponsored by Comstor, we're going to dive into Cisco's Smart Net Total Care. We discuss different service options and examine the Collector software that can help organizations get a handle on Cisco software licenses, updates, and bug fixes.

The post Tech Bytes: Understanding Cisco’s Smart Net Total Care (Sponsored) appeared first on Packet Pushers.

The Week in Internet News: IoT Hacked? Who Knows?

IoT survey: Nearly half of all companies using IoT devices don’t have mechanisms in place to detect if any of their devices have been hacked, according to a survey featured in a Fast Company story. Just 14 percent of the respondents to the Gemalto survey believe providing security is an ethical consideration.

Huge leak: More than 22 million unique passwords and 772 million email addresses were leaked and distributed by hackers in a folder named “Collection #1,” Mashable reports. The cache of emails and passwords were collected from several data, dating back to 2008.

Pushing back: WhatsApp is planning to fight India’s recent crackdown on encryption, FT.com reports. Indian policymakers have proposed rules that would allow authorities to trace the origin of encrypted messages, but WhatsApp says it will protest the proposals.

Fighting fake news: Japan’s government plans to come up with a plan to fight fake news by June, Japan Times says. The plan could include requiring social media companies to create codes of conduct. Several other attempts by governments to fight fake news have led to concerns about censorship, however.

AI as a weapon: Forbes.com has a story raising concerns about the weaponization of Artificial Intelligence. Continue reading

Argo Tunnel + DC/OS

Argo Tunnel + DC/OS

Cloudflare is proud to partner with Mesosphere on their new Argo Tunnel offering available within their DC/OS (Data Center / Operating System) catalogue! Before diving deeper into the offering itself, we’ll first do a quick overview of the Mesophere platform, DC/OS.

What is Mesosphere and DC/OS?

Mesosphere DC/OS provides application developers and operators an easy way to consistently deploy and run applications and data services on cloud providers and on-premise infrastructure. The unified developer and operator experience across clouds makes it easy to realize use cases like global reach, resource expansion, and business continuity.

In this multi cloud world Cloudflare and Mesosphere DC/OS are great complements. Mesosphere DC/OS provides the same common services experience for developers and operators, and Cloudflare provides the same common service access experience across cloud providers. DC/OS helps tremendously for avoiding vendor lock-in to a single provider, while Cloudflare can load balance traffic intelligently (in addition to many other services) at the edge between providers. This new offering will allow you to load balance through the use of Argo Tunnel.

Argo Tunnel + DC/OS

Quick Tunnel Refresh

Cloudflare Argo Tunnel is a private connection between your services and Cloudflare. Tunnel makes it such that only traffic that routes through the Continue reading

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