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Musings on Datanauts #9

I listened to episode 9 of the excellent Datanauts podcast with Ethan Banks and Chris Wahl recently.

Great job with this one, guys. I can tell how engaged I am in a podcast by how often I want to interrupt you :)

For this episode, that was lots of times!

Since I couldn't engage during the podcast, I'm going to have a one-sided discussion here, about the topics that grabbed my attention.

RARP?
Chris explained that the 'notify switches' feature of an ESXi vSwitch serves to update the L2 filtering table on upstream physical switches. This is necessary any time a VM moves from one physical link (or host) to another.

Updating the tables in all of the physical switches in the broadcast domain can be accomplished with any frame that meets the following criteria:

  • Sourced from the VM's MAC address
  • Destined for an L2 address that will flood throughout the broadcast domain
  • Specifies an Ethertype that the L2 switches are willing to forward
VMware chose to do it with a RARP frame, probably because it's easy to spoof, and shouldn't hurt anything. What's RARP? It's literally Reverse ARP. Instead of a normal ARP query, which asks: "Who has IP Continue reading

IDG Contributor Network: Make passwords easier, spy agency says

Complex passwords don’t “frustrate hackers,” all they do is make life “harder for users,” Claran Martin, the Director General of Cyber Security at the United Kingdom’s spy agency GCHQ says in a new guidance document published online (PDF). The advice contradicts previous GCHQ guidance that says that system owners should “adopt the approach that complex passwords are ‘stronger.’” GCHQ, or he Government Communications Headquarters, is the British equivalent of the National Security Agency (NSA). Amusingly, both agencies have been exposed recently as conducting widespread surveillance on their respective citizens. The more cynical might think there was secondary motive for this advice.To read this article in full or to leave a comment, please click here

QOTW: Knowledge

Knowledge depends on the direction given to our passions and on our moral habits. To calm our passions is to awaken in ourselves the sense of the universal; to correct ourselves is to bring out the sense of the true.
Sertillanges, The Intellectual Life

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Defining SDN Down

If a WAN product that uses software to control the flow of traffic is an SD-WAN, and a data center than uses software to build a virtual topology is an SD-DC, and a storage product that uses software to emulate traditional hardware storage products is SD storage, and a network where the control plane has been pulled into some sort of controller an SDN, aren’t my profile on LinkedIn, and my twitter username @rtggeek software defined people (SDP)? A related question — if there are already IoT vendors, and the IoT already has a market, can we declare the hype cycle dead and move on with our lives? Or is hype too useful to marketing folks to let it go that easily? One thing we do poorly in the networking world is define things. We’re rather sloppy about the language we use — and it shows.

Back on topic, but still to the point — maybe it’s time to rethink the way we use the phrase software defined. Does SD mean one thing emulating another? Does SD mean centralized control? Does SD mean software controlled? Does SD mean separating the control plane from the data plane? Does SD mean OpenFlow?

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AMD suffers another loss at the hands of the PC market

Struggling amidst a continued downturn in the PC industry, AMD reported a wider loss than expected, though beating analysts’ revenue expectations.AMD reported a third quarter 2015 loss of $197 million on revenue of $1.06 billion, blaming lower CPU and GPU sales for the red ink. A year ago, AMD reported a profit of $17 million on revenue of $1.43 billion, a drop of 26 percent in revenue. Analysts surveyed by Thomson Reuters expected AMD to report a loss of 12 cents a share and revenue of $995.87 million for the third quarter.To read this article in full or to leave a comment, please click here

US proposal aims to regulate car privacy, make hacks illegal

A subcommittee of the U.S. House of Representatives has proposed requiring vehicle manufacturers to state their privacy policies, besides providing for civil penalties of up to US$100,000 for the hacking of vehicles.The lawmakers have also proposed that the National Highway Traffic Safety Administration set up an Automotive Cybersecurity Advisory Council to develop cybersecurity best-practices for manufacturers of cars sold in the U.S.The move comes in the wake of the increasing automation of cars, which has raised privacy concerns, and the high-profile hack of a Jeep Cherokee.The House Energy and Commerce Subcommittee on Commerce, Manufacturing, and Trade has released the staff draft ahead of a hearing next week on “Examining Ways to Improve Vehicle and Roadway Safety."To read this article in full or to leave a comment, please click here

Google, Facebook and peers criticize CISA bill ahead of Senate consideration

A trade group representing Facebook, Google, Yahoo and other tech and communications companies has come down heavily against the Cybersecurity Information Sharing Act of 2015, a controversial bill in the U.S. that is intended to encourage businesses to share information about cyberthreats with the government.The Computer & Communications Industry Association claims that the mechanism CISA prescribes for the sharing of cyberthreat information does not adequately protect users’ privacy or put an appropriate limit on the permissible uses of information shared with the government.The bill, in addition, "authorizes entities to employ network defense measures that might cause collateral harm to the systems of innocent third parties," the CCIA said in a blog post Thursday.To read this article in full or to leave a comment, please click here

Would I take Wireshark training?

If the buck stops with you when it comes to troubleshooting strange and bizarre application behavior, you’ll want to be able to use a packet capture tool effectively. Wireshark is ubiquitous; most network engineers use it. Wireshark has an active user and development community. Plus, there is a commercial variant through Riverbed if you care to go that route. Therefore, I view Wireshark as a safe packet analysis tool to spend time learning intimately.

What’s inside your containers? Why visibility and control are critical for container security

This vendor-written tech primer has been edited by Network World to eliminate product promotion, but readers should note it will likely favor the submitter’s approach.As organizations turn to containers to improve application delivery and agility, the security ramifications of the containers and their contents are coming under increased scrutiny.Container providers Docker, Red Hat and others are moving aggressively to reassure the marketplace about container security. In August Docker delivered Docker Content Trust as part of the Docker 1.8 release. It uses encryption to secure the code and software versions running in Docker users’ software infrastructures. The idea is to protect Docker users from malicious backdoors included in shared application images and other potential security threats.To read this article in full or to leave a comment, please click here

What’s inside your containers? Why visibility and control are critical for container security

This vendor-written tech primer has been edited by Network World to eliminate product promotion, but readers should note it will likely favor the submitter’s approach.

As organizations turn to containers to improve application delivery and agility, the security ramifications of the containers and their contents are coming under increased scrutiny.

Container providers Docker, Red Hat and others are moving aggressively to reassure the marketplace about container security. In August Docker delivered Docker Content Trust as part of the Docker 1.8 release. It uses encryption to secure the code and software versions running in Docker users’ software infrastructures. The idea is to protect Docker users from malicious backdoors included in shared application images and other potential security threats.

To read this article in full or to leave a comment, please click here

FireEye Myth and Reality

Some tech companies are always associated with their first acts. Dell just acquired my first employer, EMC Corporation, in order to expand its enterprise portfolio yet the company will always be linked with personal computers and its founder’s dorm room.  F5 has become a nexus that brings together networks and applications but will always retain the moniker of a load balancing company.  Bit9 has established itself as a major next-generation endpoint player yet some people can only think of its original focus on white listing.In my opinion, FireEye shares a similar limited reputation as many security professionals equate the company with a single cybersecurity technology, network “sandboxing,” in spite of its acquisitions, progress, and diversification. This perception seems especially true on Wall Street where financial analysts continue to judge FireEye based upon the number of competitive vendors who offer network sandboxes of their own. To read this article in full or to leave a comment, please click here

One year at Plexxi and the Future of Networking

It’s almost time to celebrate my one-year work anniversary with Plexxi, coming up next month. When I began here I set out with a grand vision set on building a simply better network. I’m grateful to the entire Plexxi team for their commitment and hard work to make many of our goals a reality. I believe that today we are better and stronger as a company. We have meaningful industry partnerships like our distribution agreement with Arrow, groundbreaking product developments and more financing to make our goals and growth plans a reality.

Last week I spoke with Chris Talbot, a writer at FierceEnterpriseCommunications and had the opportunity to reflect on my time with Plexxi so far. Chris and I discussed what led me to join Plexxi, why I believe in what we’re doing and why we’re pioneering a new path for networks that is going to lead the industry for years to come.

We are making great strides and I’m excited about the momentum we have going for us right now and what the future holds. You can find Chris’ article, “The Future of Networking is Photonic Underlays” here. Let me know what you think.

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