Scaling SDN: Is OpenFlow Ready for Prime Time?

Pica8 Says ‘Yes’ and Challenges the FUD

Up to this point, OpenFlow has mostly been deployed in research and higher-education environments.  These early trials have shed some light on interesting use cases, what OpenFlow is good for, and of course, what OpenFlow might not be so good for.

This is important because OpenFlow and SDN adoption is only going to grow.  It’s imperative that we understand these limitations – specifically, what’s real and what’s FUD.

One of these is scale.

If you’ve kicked the tires on OpenFlow, one question you may have heard is “How many flows does that switch support?”  However, this question is only part of the story.  It’s like asking only about a car’s top speed when what you should be thinking other things too – such as fuel efficiency and maintenance.  So to figure out the right questions, we first need to go over a bit of background.

In its most basic terms, any network traffic, whether it’s Layer 2, Layer 3, or something else, is governed by a of forwarding rules as defined by a series of protocols.  If it’s this MAC, do this.  If it’s that IP, go Continue reading

That wraps it up for end-to-end

The defining feature of the Internet back in 1980 was "end-to-end", the idea that all the intelligence was on the "ends" of the network, and not in middle. This feature is becoming increasingly obsolete.

This was a radical design at the time. Big corporations and big government still believed in the opposite model, with all the intelligence in big "mainframe" computers at the core of the network. Users would just interact with "dumb terminals" on the ends.

The reason the Internet was radical was the way it gave power to the users. Take video phones, for example. AT&T had been promising this since the 1960s, as the short segment in "2001 A Space Odyssey" showed. However, getting that feature to work meant replacing all the equipment inside the telephone network. Telephone switches would need to know the difference between a normal phone call and a video call. Moreover, there could be only one standard, world wide, so that calling Japan or Europe would work with their video telephone systems. Users were powerless to develop video calling on their own -- they would have to wait for the big telcom monopolies to develop it, however long it took.

That changed with Continue reading

The onePK office prank

Panic attackYou know those times when you paste innocuous config to a router and it just freezes up on you? Even if you know you’ve done nothing wrong it can be a few scary seconds until the router starts to respond again. While reading up on onePK I was trying to come up with a use case. Though I eventually thought about some other things that would actually be useful. The very first thing that came to mind was something to test just for fun.

The prank

Picture this; You ask a co-worker to login to a router and shutdown an interface which won’t be used anymore. Your colleague logs into the device and disables the interface and the session hangs. Only it doesn’t just hang, it’s dead and apparently your colleague can’t ping the device now. At this point it can be a good idea to ask your co-worker about what exactly he changed.

Continue reading

The onePK office prank

You know those times when you paste innocuous config to a router and it just freezes up on you? Even if you know you’ve done nothing wrong it can be a few scary seconds until the router starts to respond again. While reading up on onePK I was trying to come up with a use case. Though I eventually thought about some other things that would actually be useful. The very first thing that came to mind was something to test just for fun.

The prank

Picture this; You ask a co-worker to login to a router and shutdown an interface which won’t be used anymore. Your colleague logs into the device and disables the interface and the session hangs. Only it doesn’t just hang, it’s dead and apparently your colleague can’t ping the device now. At this point it can be a good idea to ask your co-worker about what exactly he changed.

Continue reading

OVS Fall 2014 Conference: Observations and Takeaways

Last week we hosted the Open vSwitch 2014 Fall Conference, which was another great opportunity to demonstrate our continued investment in leading open source technologies. To get a sense of the energy and enthusiasm at the event, take a quick view of this video we captured with attendees.

I’ve been thinking about the key takeaways from everything I saw and everyone I spoke with.

First, there’s huge interest in Open vSwitch performance, both in terms of measurement and improvement. The talks from Rackspace and Noiro Networks/Cisco led me to believe that we’ve reached the point where Open vSwitch performance is good enough on hypervisors for most applications, and often faster than competing software solutions such as the Linux bridge.

Talks from Intel and one from Luigi Rizzo at the University of Pisa demonstrated that by bypassing the kernel entirely through DPDK or netmap, respectively, we haven’t reached the limits of software forwarding performance. Based on a conversation I had with Chris Wright from Red Hat, this work is helping the Linux kernel community look into reducing the overhead of the kernel, so that we can see improved performance without losing the functionality provided by the kernel.

Johann Tönsing from Netronome Continue reading

We Are At HP Discover Conference in Barcelona Next Week

The Packet Pushers team are once again packing their virtual underpants and this time heading to Spain at HP Discover in Barcelona with our “cloud studio”. Next week we will enjoying some warm winter nerdiness on HP Networking products and strategy, looking closely at the ever-growing HP VAN strategy for SDN and also diving in the bread & […]

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Greg Ferro

Greg Ferro is a Network Engineer/Architect, mostly focussed on Data Centre, Security Infrastructure, and recently Virtualization. He has over 20 years in IT, in wide range of employers working as a freelance consultant including Finance, Service Providers and Online Companies. He is CCIE#6920 and has a few ideas about the world, but not enough to really count.

He is a host on the Packet Pushers Podcast, blogger at EtherealMind.com and on Twitter @etherealmind and Google Plus.

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The post We Are At HP Discover Conference in Barcelona Next Week appeared first on Packet Pushers Podcast and was written by Greg Ferro.

Segmenting for security: Five steps to protect your network

Relying on a DMZ to protect your network and data is like putting money in a bank that depends on one guard and a single gate to secure its deposits. Imagine how tempting all those piles of money would be to those who had access — and how keen everyone else would be to obtain access.

But banks do not keep cash out on tables in the lobby, they stash it in security boxes inside vaults, behind locked doors, inside a building patrolled by a guard and secured by a gate. Likewise, network segmentation offers similar security for an organization’s assets.

+ ALSO ON NETWORK WORLD Free security tools you should try +

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

The Coming App-ocalypse – are we seeing Dot-Com 2.0?

Bubble 2.0?

I recently received a note from a colleague from ZeroHedge (http://www.zerohedge.com/news/2014-11-21/not-so-fab-1-billion-valuation-15-million-year) that was officially calling the beginning of the bubble bursting based on the untimely (or timely depending on your perspective) demise of the startup Fab. I had never heard of Fab, but according to ZeroHedge, Fab “started out as a dating site for the gay community and then relaunched as a flash sale site for home decor – raised $150 million just over a year ago (at a $1 billion valuation), but as TechCrunch reports today, multiple sources have confirmed that Fab is in talks to sell to PCH International for $15 million in a half cash and half stock deal. Pets.com?”

And Therefore…

Its a fair question indeed – are we seeing the same pattern we saw in the last bubble (i.e. Dot-Com 1.0) being repeated? Certainly, crazy valuations of equally crazy or non-existent business models are a cause for concern, but more important than that are the fundamentals of what is driving the speculation in the first place. In Dot-Com 1.0 we saw simultaneous speculative investment across at least 3 major areas: internet backbone infrastructure, internet edge/access Continue reading

4 Inevitable Questions When Joining a Monitoring Group, Pt. 2

Leon Adato, Technical Product Marketing Manager with SolarWinds is our guest blogger today, with a sponsored post in a four-part series on the topic of alerting. In the first part of this series, Leon explained how to answer the first of four (ok, really 5) questions that monitoring professionals are inevitably asked once they join […]

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The Packet Pushers work with our vendors to present a limited number of sponsored blog posts to our community. This is one. If you're a vendor and think you have some blog content you'd like to sponsor, contact us via [email protected].

The post 4 Inevitable Questions When Joining a Monitoring Group, Pt. 2 appeared first on Packet Pushers Podcast and was written by Sponsored Blog Posts.

Thwarting attackers with threat intelligence

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.

News reports show cyber attacks continue to outpace IT’s ability to protect critical data, but teams that have built systems to deliver accurate threat intelligence can often end an attack before damage is done. Threat intelligence comes from commercially available information, ongoing analysis of user behavior and native intelligence from within the organization.

+ ALSO ON NETWORK WORLD 5 ways to escape password hell +

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

5 essentials of effective cloud data integration, a customer perspective

In search of agility and low overhead, companies are putting as many applications as practical in the cloud. But the resulting hybrid IT environments, where certain applications remain on-premise for security or other reasons, can result in data integration issues that reduce efficiency drags and hamper agility.

In fact, cloud integration is much more demanding than many people want to believe.

As an applications intelligence company that has built its customer-facing and internal operations primarily on cloud applications within a hybrid environment, AppDynamics has had considerable experience with cloud data integration. Here are the five essential data integration capabilities that any company serious about harnessing the cloud should have in its pocket:

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

The Degree or the Certification: Answering the Question

Okay, finally, I’m going to answer the question. For some value of the word “answer,” anyway. I’ve spent three weeks thinking through various question you should be asking, along the way making three specific points:

Okay, so how do I actually decide?

First, ask: where do I want to go? Who do I want to be as a person, overall? This question needs to be a “bigger life” question, not a narrow, “how much money do I want to be making,” question. One of those other turning points in my life as an engineer was when Don S said to me one day, “When I’m gone, people aren’t going to remember me for writing a book. They are going to remember me as a father, friend, and Continue reading

Configure a DMVPN Spoke behind a Home router/modem

I’ve come across this scenario on multiple occasions now. Your company wants to set up a demo at a “customers” location. Your demo is reliant on its own router talking back to HQ to pull necessary data for the program in question. Unfortunately your internet connection at the “demo” site is sitting behind a NAT. […]

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Korey

Korey

Korey is a Network Engineer and Military veteran with over 8 years of experience in the IT industry. Currently holds the following certifications; CCNP R&S, JNCIA, and CCNA Security. He is interested in advancing his network knowledge and teaching others. Currently works as a Network Engineer and is responsible for day to day operations as well as network design and implementation.

The post Configure a DMVPN Spoke behind a Home router/modem appeared first on Packet Pushers Podcast and was written by Korey.

Juniper SRX-110H EoL

Somehow I missed this when it was announced, but the Juniper SRX-110H-VA is End of Life, and is no longer supported for new software releases.

End of Life announcement is here, with extra detail in this PDF. Announcement was Dec 10 2013, with “Last software engineering support” date Dec 20 2013.

This is now starting to take effect, with 12.1X47 not supported on this platform:

Note: Upgrading to Junos OS Release 12.1X47-D10 or later is not supported on the J Series devices or on the low-memory versions of the SRX100 and SRX200 lines. If you attempt to upgrade one of these devices to Junos OS 12.1X47-D10, installation will be aborted with the following error message:

ERROR: Unsupported platform <platform-name >for 12.1X47 and higher

The replacement hardware is the SRX-110H2-VA, which has 2GB of RAM instead of 1GB. Otherwise it’s exactly the same, which seems a missed opportunity to at least update to local 1Gb switching.

Michael Dale has a little more info here, along with tips for tricking a 240H into installing 12.1X47.

So I decided to see if I could work around this and trick JunOS into installing on my 240H, I Continue reading

Using EEM to Speed up Multicast Convergence when Receiver is Dually Connected

When deploying PIM ASM, the Designated Router (DR) role plays a significant part in how PIM ASM works. The DR on a segment is responsible for registering mulicast sources with the Rendezvous Point (RP) and/or sending PIM Joins for the segment. Routers with PIM enabled interfaces send out PIM Hello messages every 30 seconds by default.

EEM1

After missing three Hellos the secondary router will take over as the DR. With the standard timer value, this can take between 60 to 90 seconds depending on when the last Hello came in. Not really acceptable in a modern network.

The first thought is to lower the PIM query interval, this can be done and it supports sending PIM Hellos at msec level. In my particular case I needed convergence within two seconds. I tuned the PIM query interval to 500 msec meaning that the PIM DR role should converge within 1.5 seconds. The problem though is that these Hellos are sent at process level. Even though my routers were barely breaking a sweat CPU wise I would see PIM adjacencies flapping.

The answer to my problems would be to have Bidirectional Forwarding Dectection (BFD) for PIM but it’s only supported on Continue reading

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