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The Limits of Cloud: Gratuitous ARP and Failover
Understanding the limitations of cloud will better enable a successful migration strategy

Cloud is great at many things. At other things, not so much. Understanding the limitations of cloud will better enable a successful migration strategy.

One of the truisms of technology is that takes a few years of adoption before folks really start figuring out what it excels at – and conversely what it doesn't. That's generally because early adoption is focused on lab-style experimentation that rarely extends beyond basic needs.

It's when adoption reaches critical mass and folks start trying to use the technology to implement more advanced architectures that the "gotchas" start to be discovered.

Cloud is no exception.

whatclouddoesrightandwrong

 

A few of the things we've learned over the past years of adoption is that cloud is always on, it's simple to manage, and it makes applications and infrastructure services easy to scale.

Some of the things we're learning now is that cloud isn't so great at supporting application mobility, monitoring of deployed services and at providing advanced networking capabilities.

The reason that last part is so important is that a variety of enterprise-class capabilities we've come to rely upon are ultimately enabled by some of the advanced networking techniques cloud simply does not support.

Take gratuitous ARP, for example. Most cloud providers do not allow or support this feature which ultimately means an inability to take advantage of higher-level functions traditionally taken for granted in the enterprise – like failover.

GRATUITOUS ARP and ITS IMPLICATIONS

For those unfamiliar with gratuitous ARP let's get you familiar with it quickly. A gratuitous ARP is an unsolicited ARP request made by a network element (host, switch, device, etc… ) to resolve its own IP address. The source and destination IP address are identical to the source IP address assigned to the network element. The destination MAC is a broadcast address. Gratuitous ARP is used for a variety of reasons. For example, if there is an ARP reply to the request, it means there exists an IP conflict. When a system first boots up, it will often send a gratuitous ARP to indicate it is "up" and available. And finally, it is used as the basis for load balancing failover. To ensure availability of load balancing services, two load balancers will share an IP address (often referred to as a floating IP). Upstream devices recognize the "primary" device by means of a simple ARP entry associating the floating IP with the active device. If the active device fails, the secondary immediately notices (due to heartbeat monitoring between the two) and will send out a gratuitous ARP indicating it is now associated with the IP address and won't the rest of the network please send subsequent traffic to it rather than the failed primary. VRRP and HSRP may also use gratuitous ARP to implement router failover.   how-failure-lb-works

Most cloud environments do not allow broadcast traffic of this nature. After all, it's practically guaranteed that you are sharing a network segment with other tenants, and thus broadcasting traffic could certainly disrupt other tenant's traffic. Additionally, as security minded folks will be eager to remind us, it is fairly well-established that the default for accepting gratuitous ARPs on the network should be "don't do it".

The astute observer will realize the reason for this; there is no security, no ability to verify, no authentication, nothing. A network element configured to accept gratuitous ARPs does so at the risk of being tricked into trusting, explicitly, every gratuitous ARP – even those that may be attempting to fool the network into believing it is a device it is not supposed to be.

That, in essence, is ARP poisoning, and it's one of the security risks associated with the use of gratuitous ARP. Granted, someone needs to be physically on the network to pull this off, but in a cloud environment that's not nearly as difficult as it might be on a locked down corporate network. Gratuitous ARP can further be used to execute denial of service, man in the middle and MAC flooding attacks. None of which have particularly pleasant outcomes, especially in a cloud environment where such attacks would be against shared infrastructure, potentially impacting many tenants.

Thus cloud providers are understandably leery about allowing network elements to willy-nilly announce their own IP addresses.

That said, most enterprise-class network elements have implemented protections against these attacks precisely because of the reliance on gratuitous ARP for various infrastructure services. Most of these protections use a technique that will tentatively accept a gratuitous ARP, but not enter it in its ARP cache unless it has a valid IP-to-MAC mapping, as defined by the device configuration. Validation can take the form of matching against DHCP-assigned addresses or existence in a trusted database.

Obviously these techniques would put an undue burden on a cloud provider's network given that any IP address on a network segment might be assigned to a very large set of MAC addresses.

Simply put, gratuitous ARP is not cloud-friendly, and thus it is you will be hard pressed to find a cloud provider that supports it.

What does that mean?

That means, ultimately, that failover mechanisms in the cloud cannot be based on traditional techniques unless a means to replicate gratuitous ARP functionality without its negative implications can be designed.

Which means, unfortunately, that traditional failover architectures – even using enterprise-class load balancers in cloud environments – cannot really be implemented today. What that means for IT preparing to migrate business critical applications and services to cloud environments is a careful review of their requirements and of the cloud environment's capabilities to determine whether availability and uptime goals can – or cannot – be met using a combination of cloud and traditional load balancing services.

Read the original blog entry...

About Lori MacVittie
Lori MacVittie is responsible for education and evangelism of application services available across F5’s entire product suite. Her role includes authorship of technical materials and participation in a number of community-based forums and industry standards organizations, among other efforts. MacVittie has extensive programming experience as an application architect, as well as network and systems development and administration expertise. Prior to joining F5, MacVittie was an award-winning Senior Technology Editor at Network Computing Magazine, where she conducted product research and evaluation focused on integration with application and network architectures, and authored articles on a variety of topics aimed at IT professionals. Her most recent area of focus included SOA-related products and architectures. She holds a B.S. in Information and Computing Science from the University of Wisconsin at Green Bay, and an M.S. in Computer Science from Nova Southeastern University.

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Cloud Expo - Cloud Looms Large on SYS-CON.TV


Cloud Expo 2013 East Opening Keynote by IBM
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In the old world of IT, if you didn't have hardware capacity or the budget to buy more, your project was dead in the water. Budget constraints can leave some of the best, most creative and most ingenious innovations on the cutting room floor. It's a true dilemma for developers and innovators – why spend the time creating, when a project could be abandoned in a blink? That was the old world. In the new world of IT, developers rule. They have access to resources they can spin up instantly. A hybrid cloud ignites innovation and empowers developers to focus on what they need. A hybrid cloud blends the best of all worlds, public cloud, private cloud and dedicated servers to fit the needs of developers and offer the ideal environment for each app and workload without the constraints of a one-size-fits-all cloud.

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The 3rd International Internet of @ThingsExpo, co-located with the 16th International Cloud Expo - to be held June 9-11, 2015, at the Javits Center in New York City, NY - announces that its Call for Papers is now open. The Internet of Things (IoT) is the biggest idea since the creation of the Worldwide Web more than 20 years ago.
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When an enterprise builds a hybrid IaaS cloud connecting its data center to one or more public clouds, security is often a major topic along with the other challenges involved. Security is closely intertwined with the networking choices made for the hybrid cloud. Traditional networking approaches for building a hybrid cloud try to kludge together the enterprise infrastructure with the public cloud. Consequently this approach requires risky, deep "surgery" including changes to firewalls, subnets...
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DevOps is all about agility. However, you don't want to be on a high-speed bus to nowhere. The right DevOps approach controls velocity with a tight feedback loop that not only consists of operational data but also incorporates business context. With a business context in the decision making, the right business priorities are incorporated, which results in a higher value creation. In his session at DevOps Summit, Todd Rader, Solutions Architect at AppDynamics, discussed key monitoring techniques...
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SYS-CON Media announced that Centrify, a provider of unified identity management across cloud, mobile and data center environments that delivers single sign-on (SSO) for users and a simplified identity infrastructure for IT, has launched an ad campaign on Cloud Computing Journal. The ads focus on security: how an organization can successfully control privilege for all of the organization’s identities to mitigate identity-related risk without slowing down the business, and how Centrify provides ...
The Internet of Things will put IT to its ultimate test by creating infinite new opportunities to digitize products and services, generate and analyze new data to improve customer satisfaction, and discover new ways to gain a competitive advantage across nearly every industry. In order to help corporate business units to capitalize on the rapidly evolving IoT opportunities, IT must stand up to a new set of challenges. In his session at @ThingsExpo, Jeff Kaplan, Managing Director of THINKstrateg...
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One of the biggest challenges when developing connected devices is identifying user value and delivering it through successful user experiences. In his session at Internet of @ThingsExpo, Mike Kuniavsky, Principal Scientist, Innovation Services at PARC, described an IoT-specific approach to user experience design that combines approaches from interaction design, industrial design and service design to create experiences that go beyond simple connected gadgets to create lasting, multi-device exp...
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Enthusiasm for the Internet of Things has reached an all-time high. In 2013 alone, venture capitalists spent more than $1 billion dollars investing in the IoT space. With "smart" appliances and devices, IoT covers wearable smart devices, cloud services to hardware companies. Nest, a Google company, detects temperatures inside homes and automatically adjusts it by tracking its user's habit. These technologies are quickly developing and with it come challenges such as bridging infrastructure gaps,...
"Cloud consumption is something we envision at Solgenia. That is trying to let the cloud spread to the user as a consumption, as utility computing. We want to allow the people to just pay for what they use, not a subscription model," explained Ermanno Bonifazi, CEO & Founder of Solgenia, in this SYS-CON.tv interview at Cloud Expo, held Nov 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA.
The Domain Name Service (DNS) is one of the most important components in networking infrastructure, enabling users and services to access applications by translating URLs (names) into IP addresses (numbers). Because every icon and URL and all embedded content on a website requires a DNS lookup loading complex sites necessitates hundreds of DNS queries. In addition, as more internet-enabled ‘Things' get connected, people will rely on DNS to name and find their fridges, toasters and toilets. Acco...
"For the past 4 years we have been working mainly to export. For the last 3 or 4 years the main market was Russia. In the past year we have been working to expand our footprint in Europe and the United States," explained Andris Gailitis, CEO of DEAC, in this SYS-CON.tv interview at Cloud Expo, held Nov 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA.
Connected devices and the Internet of Things are getting significant momentum in 2014. In his session at Internet of @ThingsExpo, Jim Hunter, Chief Scientist & Technology Evangelist at Greenwave Systems, examined three key elements that together will drive mass adoption of the IoT before the end of 2015. The first element is the recent advent of robust open source protocols (like AllJoyn and WebRTC) that facilitate M2M communication. The second is broad availability of flexible, cost-effective ...
Top Stories for Cloud Expo 2012 East

In this "Cloud Trends" Power Panel at the 10th International Cloud Expo, moderated by Cloud Expo Conference Chair Jeremy Geelan, Karen Padir, EVP of Products & Engineering at EnterpriseDB, and Aaron Hollobaugh, VP of Marketing & Communications at Hostway Corporation, map the hottest areas of cloud computing right now, and share real-world examples of offerings that are generating value. ... (more)

Best Recent Articles on Cloud Computing & Big Data Topics
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What do you get when you combine Big Data technologies….like Pig and Hive? A flying pig? No, you get a “Logical Data Warehouse.” In 2012, Infochimps (now CSC) leveraged its early use of stream processing, NoSQLs, and Hadoop to create a design pattern which combined real-time, ad-hoc, and batch analytics. This concept of combining the best-in-breed Big Data technologies will continue to advance across the industry until the entire legacy (and proprietary) data infrastructure stack will be replaced with a new (and open) one.
While unprecedented technological advances have been made in healthcare in areas such as genomics, digital imaging and Health Information Systems, access to this information has been not been easy for both the healthcare provider and the patient themselves. Regulatory compliance and controls, information lock-in in proprietary Electronic Health Record systems and security concerns have made it difficult to share data across health care providers.
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12th International Cloud Expo, held on June 10–13, 2013 at the Javits Center in New York City, featured four content-packed days with a rich array of sessions about the business and technical value of cloud computing led by exceptional speakers from every sector of the cloud computing ecosystem. The Cloud Expo series is the fastest-growing Enterprise IT event in the past 10 years, devoted to every aspect of delivering massively scalable enterprise IT as a service.
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It's a simple fact that the better sales reps understand their prospects' intentions, preferences and pain points during calls, the more business they'll close. Each day, as your prospects interact with websites and social media platforms, their behavioral data profile is expanding. It's now possible to gain unprecedented insight into prospects' content preferences, product needs and budget. We hear a lot about how valuable Big Data is to sales and marketing teams. But data itself is only valuable when it's part of a bigger story, made visible in the right context.
Cloud Expo, Inc. has announced today that Larry Carvalho has been named Tech Chair of Cloud Expo® 2014. 14th International Cloud Expo will take place on June 10-12, 2014, at the Javits Center in New York City, New York, and 15th International Cloud Expo® will take place on November 4-6, 2014, at the Santa Clara Convention Center in Santa Clara, CA.
Everyone talks about a cloud-first or mobile-first strategy. It's the trend du jour, and for good reason as these innovative technologies have revolutionized an industry and made savvy companies a lot of money. But consider for a minute what's emerging with the Age of Context and the Internet of Things. Devices, interfaces, everyday objects are becoming endowed with computing smarts. This is creating an unprecedented focus on the Application Programming Interface (API) as developers seek to connect these devices and interfaces to create new supporting services and hybrids. I call this trend the move toward an API-first business model and strategy.
We live in a world that requires us to compete on our differential use of time and information, yet only a fraction of information workers today have access to the analytical capabilities they need to make better decisions. Now, with the advent of a new generation of embedded business intelligence (BI) platforms, cloud developers are disrupting the world of analytics. They are using these new BI platforms to inject more intelligence into the applications business people use every day. As a result, data-driven decision-making is finally on track to become the rule, not the exception.
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There is little doubt that Big Data solutions will have an increasing role in the Enterprise IT mainstream over time. Get a jump on that rapidly evolving trend at Big Data Expo, which we are introducing in June at
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Cloud Expo was a fantastic event for CSS Corp - we easily exceeded our objectives for engaging with clients and prospects."
AHMAR ABBAS
SVP, Global Infrastructure Management, CSS Corp.
 
With our launch at Cloud Expo, we successfully transformed the company from a relatively unknown European player into the dominant player in the market. Our competitors were taken by surprise and just blown away. We got a huge number of really high quality leads..."
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We were extremely pleased with Cloud Expo this year - I’d say it exceeded expectations all around. This is the same info we got from partners who attended as well. Nice job!"
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@CloudExpo Blogs
In a perfect world, Application Performance Management (APM) has all the right elements in place, providing value to the business and IT by giving us the metrics we need and showing us the health of our applications. It alerts us to anomalies when slowdowns occur, and shows us trends on performance. But there are other elements in play that can make the operations a little smoother and our days a little brighter.
DevOps Summit at Cloud Expo 2014 Silicon Valley was a terrific event for us. The Qubell booth was crowded on all three days. We ran demos every 30 minutes with folks lining up to get a seat and usually standing around. It was great to meet and talk to over 500 people! My keynote was well received and so was Stan's joint presentation with RingCentral on Devops for BigData. I also participated in two Power Panels – ‘Women in Technology’ and ‘Why DevOps Is Even More Important than You Think,’ both featuring brilliant colleagues and moderators and it was a blast to be a part of.

#IoT #IDM #SDAS #infosec

As the Internet of Things continues to expand (and it is expanding rapidly) the issue of access to applications is going to get a lot more messy.

One of the benefits of cloud, so I'm told, is it is "easy access" for everyone. Indeed, it matters not if you're on a mobile device or a tethered one, you can access stuff in the cloud easy peasy, lemon squeezy.

Which I've always thought while true, wasn't exactly what enterprises needed or wanted. Unfettered access (allow all) to applications is not exactly the secur...

The cloud has made many things simpler by allowing us to achieve economies of scale, eliminating the software installation process and enabling access of information from virtually anywhere. The list of benefits goes on, but contrary to popular belief, moving to the cloud will not make software licensing – and the challenges that go along with it – disappear. Instead, the cloud introduces a new set of software delivery models and licensing models that can make license management a challenge for the unprepared. Cloud technologies need to be carefully considered by organizations considering ne...
This case study assumes you want to build a private cloud on top of an existing virtualized datacenter composed of multiple hosts running vSphere and managed by one or several instances of vCenter. It is understood that you do not want to abandon your investment in VMware by retooling the entire stack. You want to continue managing your infrastructure with already familiar and powerful VMware tools, such as vSphere and vCenter Operations Manager. Your goal is to create a self-service cloud environment on top of your vSphere infrastructure to provide your users with a simple cloud interface fea...
Cryptocurrencies have gained traction in the past half-decade for a variety of reasons. Bitcoin has become the most popular cryptocurrency in the world due to its sudden rise in value and acceptance within the international marketplace. You might be wondering: What does cloud computing have to do with cryptocurrencies? Cloud computing is beginning to revolutionize the cryptocurrency industry. When cryptocurrencies first began gaining popularity, amateur miners would create rigs in their basements, garages and bedrooms that consisted of computing gear that sometimes housed dozens of video ca...
As our devices continue their inexorable march to greater variety and maturity, customer preferences represent the cutting edge, driving enterprises to accelerate their digital transformation initiatives to offer unified omnichannel interactions. However, this transformation goes well beyond retail, and even beyond B2C to the B2B world, as consumerization of enterprise technology takes hold in office buildings, factories, supply chains, and logistics networks around the globe.
Got a plan for your move to the cloud? If you do, you’re in the minority. According to a recent study, a mere 31 percent of those planning a move to the cloud actually have a strategy for migrating data and applications. The rest don’t. To avoid the complexity and cost, we recommend heeding the following advice. It’s but a fraction of the endless recommendations we received from cloud experts who offered well-seasoned tips on what to do and not do when you begin planning to move workloads to the cloud.
I unintentionally watched all three hours of this video series in one sitting. The presenter hooked me and before I knew it, it was three hours later. It is a very fast paced tour of the security issues that can arise when using the Android platform. The tour is built around the Open Web Application Security Project (OWASP) top 10 Mobile Security Risks as a guideline.
The process of getting a successful mobile application deployed can be complex and daunting. Architecting, designing and developing natural user interfaces for touch and gesture on mobile devices is not the same as web and desktop UI design and development. Mobile devices are used in different contexts, and bring different personas to the table. Having web and desktop architecture, development, and UI design experience does not make you a qualified mobile architect, developer, or UI designer.
Depending on whom you listen to, the private cloud is either dead or on the cusp of a major market breakthrough. Some tech pundits argue this technology has already been replaced by more efficient public cloud offerings and businesses just need time to catch up, while others claim there's a bright future for private solutions. Research supports the latter – according to IDC, spending on hosted private cloud services should hit $24 billion by 2016. Why? Because there's real value in this model. Here's a look at five compelling advantages of the private cloud. It's Not On-Premises (Necessarily...
A BriefingsDirect discussion centers on learning new best practices for managing the rapidly changing needs around identity and access management. Any modern business has been dealing with identity and access management (IAM) from day one. But now, with more critical elements of business extending beyond the enterprise, access control complexity has been ramping up due to cloud, mobile, bring your own device (BYOD), and hybrid computing. And such greater complexity forms a major deterrent to secure, governed, and managed control over who and what can access your data and services -- and unde...
The IT infrastructure of modern businesses require a number of seemingly never-ending cycles to track assets. As these assets go through different stages of usefulness or functionality, IT teams must constantly manage the process, which takes them away from other more important tasks and saddles them with mundane contractual obligations, maintenance reviews, cost-analysis and procurement paperwork. What’s the alternative to opening your IT komodo to a myriad of vendor pitches and the scrutiny of the finance department? Obsolescence. No self-respecting IT person would allow their infrastructur...
The US Federal Communications Commission has recently reported that "theft of digital information has become the most commonly reported fraud, surpassing physical theft." Businesses can do a lot to protect themselves. The FCC issued a Tip Sheet for small businesses to promote employee security training, firewalls, securing of WiFis, and more. But for business operating in (or migrating to) cloud environments; data security, cloud computing security issues, and challenges take on new meanings and require new strategies.
Over the last decade, cloud computing has undeniably become a critical component of the modern enterprise. It has evolved past Software-as-a-Service for a select number of enterprise applications to encompassing entire business platforms, spanning various business devices and operating systems, and can virtually enable new ventures to pop up overnight. The state of cloud computing today is now a crowded field of vendors, providing anything and everything as-a-service – from security and management solutions for the cloud, to converged solutions and virtualization offerings, to public, privat...
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Past SYS-CON Events
    Cloud Expo West
cloudcomputingexpo
2011west.sys-con.com

 
    Cloud Expo East
cloudcexpo
2011east.sys-con.com

 
    Cloud Expo West
cloudcomputingexpo
2010west.sys-con.com

 
    Virtualization Expo West
virtualization
2010west.sys-con.com
    Cloud Expo Europe
cloudexpoeurope2010.
sys-con.com

 
    Cloud Expo East
cloudcomputingexpo
2010east.sys-con.com

 
    Virtualization Expo East
virtualizationconference
2010east.sys-con.com
    Cloud Expo West
cloudcomputingexpo
2009west.sys-con.com

 
    Virtualization Expo West
virtualizationconference
2009west.sys-con.com
    GovIT Expo
govitexpo.com
 
    Cloud Expo Europe
cloudexpoeurope2009.sys-con.com
 

Cloud Expo 2011 Allstar Conference Faculty

S.F.S.
Dell

Singer
NRO

Pereyra
Oracle

Ryan
OpSource

Butte
PwC

Leone
Oracle

Riley
AWS

Varia
AWS

Lye
Oracle

O'Connor
AppZero

Crandell
RightScale

Nucci
Dell Boomi

Hillier
CiRBA

Morrison
Layer 7 Tech

Robbins
NYT

Schwarz
Oracle

What The Enterprise IT World Says About Cloud Expo
 
"We had extremely positive feedback from both customers and prospects that attended the show and saw live demos of NaviSite's enterprise cloud based services."
  –William Toll
Sr. Director, Marketing & Strategic Alliances
Navisite
 


 
"More and better leads than ever expected! I have 4-6 follow ups personally."
  –Richard Wellner
Chief Scientist
Univa UD
 


 
"Good crowd, good questions. The event looked very successful."
  –Simon Crosby
CTO
Citrix Systems
 


 
"It's the largest cloud computing conference I've ever seen."
  –David Linthicum
CTO
Brick Group