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 David Greenfield
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Profile of David Greenfield

Technology Writer
Blog Posts: 63
Articles by David Greenfield

7 Modeling Tools To Help Assess Cloud ROI

1/8/2013
Cloud services promise faster deployment and more flexibility, but if you want your CFO to back your cloud gambit, show her a solid financial analysis–preferably one with a good ROI. Here are 7 tools that can help.

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Disaster Recovery Lessons You Might Have Missed

11/27/2012
Hurricane Sandy had a lot to teach technology professionals about disaster recovery and business continuity. It certainly reinforced the basics—back up your data and test your DR systems—but there are other lessons to learn. Here are five.

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BufferBloat And The Collapse Of The Internet

4/21/2011
It seems that every few years there's yet another prognosticator that the Internet is about to collapse. Once it was the stellar growth in bandwidth demand driven by the phenomenal increase in Internet-connected devices. At other times, it was the lack of Net neutrality (see this video). Still other times, it was sinister attacks on BGP or the fact that we've run out of IPv4 addresses.

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Welcome To The WAN Optimization Shell Game

4/11/2011
In the early days of Ethernet switch vendors, IT organizations would routinely hear vendors profess to deliver better line rate performance at 20 percent less than the market leader. The catch, because there was always a catch in this industry, was that performance was only achievable in specific circumstances. Turn on port monitoring or enable encryption and Ethernet switch performance would skid to a halt. A similar story may be brewing in the WAN optimization space. While vendors, such as Blu

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The Importance Of Correcting Packet Loss In VDI

3/30/2011
Recently, on the LinkedIN WAN optimization professionals group, I participated in a conversation around whether virtual desktop infrastructure (VDI) is ready for the WAN. Face it, delivering responsive VDI over the WAN is going to be a challenge. One of the interesting points that came up was the importance of correcting for packet loss when considering WAN optimizers.

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What WAN Optimizers Can Learn From Firewalls

3/11/2011
Listening to the give and take about WAN optimizers made me remember another battle between networking giants. It was nearly 10 years ago, during the early days of firewalls, when it seemed Marcus Ranum, then with Network FlightRecorder, would go head-to-head with Check Point's Gil Schwed on a weekly basis. Ranum was among the early creators of the application proxy and was vociferous about the value of delivering a firewall that terminated and inspected every session before passing the contents

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The First IPv6 WAN Optimizer: Speed At What Price?

2/16/2011
Last week, Blue Coat upgraded its MACH5 to become the industry's first IPv6-compatible WAN optimizer. WAN optimizers have long supported tunneled IPv6 over IPv4, but the MACH5 is the first WAN optimization appliance to accelerate native IPv6--and then some. The MACH5 is actually a very sophisticated IPv6 application layer gateway (ALG), providing IPv6 connectivity, security and optimization in a single device. Yet it's precisely its sophistication that raises questions around device scalability

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WAN Optimization and the VDI Challenge

2/14/2011
I was sitting in on a peer-to-peer exchange about virtual desktop infrastructure (VDI) hosted by Wikibon and listening to how great VDI is for organizations. I asked about multisite VDI and what recommendations people had for implementing VDI between sites. The speaker paused and said that she hadn't see any multisite implementations. No surprise there. VDI itself is still in its infancy, but it hit me once again that if organizations are going to see VDI's benefits at the remote office, they've

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Data Centers: The Next Frontier For WAN Optimizers?

1/6/2011
Signs of the increasingly pivotal role that WAN optimization is playing in the enterprise can be seen in the emergence of hybrid cloud architectures within corporate networks. As Mike so poignantly pointed out in his blog, the simple ability to run a VM does not make an application ready for the cloud. If developers are to leverage on-demand services, such as Amazon's EC2, they need to rethink how they architect their software to leverage a hybrid cloud environment.

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Big Data: Store Everything And Watch Storage Grow

11/17/2010
One of the big stories from the Teradata Partners conference that just finished up in San Diego was the huge advantage that retailers gain by the tracking the buying actions of their customers online and the enormous impact that's going to have on your storage assets in the years ahead. Business managers can't predict what questions they want to ask about their customers and can't say which collected data is useful or not. The answer is to store it all.

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What's Right And Wrong About IOV On The Motherboard

10/21/2010
Two months ago we were talking about when IOV would make it to the motherboard. Representatives from Xsigo played down the whole concept, arguing it was still premature . Perhaps they were right, or perhaps it was just misdirection on the part of Jon Toor, vice president of marketing at Xsigo, because buried in the details of HP's new server introduction, the SL6500 was IOV on the motherboard. The back and forth illustrates what's right and wrong in today's IOV world.

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The Skype-Avaya Matchup May Transform The Call Center

10/4/2010
Avaya and Skype have announced a joint integration that makes Skype services available on a variety of Avaya platforms. Under the terms of the relationship, Avaya customers in the US will be able to make global calls via Skype right from their Avaya communications system. This is good news for enterprises today because the partnership can help them cut costs. In the long term, it may be even better news for contact centers because it will provide greater opportunity for businesses to connect wi

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Avaya Flare: Eye Candy For Your CEO

9/24/2010
Collaboration pundits got their drool opportunity last week with the introduction of Flare, Avaya's new communication tablet. For IT pros, Flare's real impact may have less to do what happens while in the hall and more at the desk. The Flare Experience, as Avaya calls is, a new kind of interface that will initially be available on the Avaya Desktop Video Device. Think of it as an iPad for business users.

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Google's Enterprise Communications Play

8/27/2010
Enterprise IT professionals have reputations as curmudgeons who can cite 32 reasons why deploying a particular codec won't work on a particular link, or why choosing that particular application isn't the smartest thing to do (aka a really dumb thing to do). But have we missed the mark by being skeptical of Google's communication revolution? Surely you've had to field questions like "Why can't we just use Google Docs?" or "Can't I just run GTalk inside the firewall?" But there's good reason for t

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Considering Skype For The Enterprise

8/17/2010
I recently wrote about how Skype is going to be using the revenue generated from the IPO to attack the business market. The company does a good job highlighting its penetration into fringe business cases--mobility and international calling--and emerging business cases, such as video calling, but perceptions of Skype as prone to security and other problems have been a barrier to enterprise-grade use. Should you consider Skype for enterprise-wide deployment? Let's discuss.

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IPO Fueling Skype's Business Play

8/11/2010
Reading about Skype's IPO filing on Gigaom reminded me of a conversation that I and Michael Osterman had with David Gurlé, the general manager for Skype for Business in June. Gurlé was in France at the time when we caught up with him, and we spoke about the Skype's future in the business market. He was bullish, as you'd expect, about their prospects to penetrate business, and went through detailed plans on how Skype for Business would succeed in business communications.

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Alcatel-Lucent Goes SIP Crazy

2/15/2007
Behind the discussions of innovation and enterprise-focus that permeated the keynotes and speeches here at the Alcatel-Lucent enterprise forum in Paris, the company demoted the SIP focus that will occupy much of is innovation this year....

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Apple's Top 10 iPhone Gaffes

1/15/2007
Having woken up from my spout of iPhone induced gizmo-lust, I've uncovered 10 ways Sir Jobs and co. have flubbed the iPhone introduction. And so without further adieu here they are......

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Nortel's Vision For Telephony

8/22/2006
I bumped into the Phil Edholm, chief technology officer and vice president of Strategy and Architecture for Nortel's Enterprise Solutions and Packet Networks group, here in the halls at VoiceCon. We spoke about the opportunities for Nortel in light of...

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More Bad News For Internet Telephony Providers

8/2/2006
Internet telephony providers are in for some more rough times. The IRS and Department of Treasury helped traditional carriers cut their costs yesterday by eliminating the three percent Federal Excise Tax (FET) on long-distance telecoms. They also chose not to...

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The Normalcy of War

7/19/2006
We're at war ??? again. No kidding. It seems that life in Israel is the stuff that happens between battles and bombings. Only what's so strange about the Lebanon war, at least for this Jerusalem-based journalist, is how normal it...

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FBI: We Want Your IMs

7/11/2006
CNET News is reporting that new legislation being drafted by FBI will require ISPs to wiretap conversations and force makers of networking gear to alter their hardware to accommodate that capability....

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Telecoms in the Kingdom of Hippos

7/11/2006
It's easy for us urban dwellers to forget that most of the Internet world doesn't live pining away for optical-driven packet performance or even broadband. Their more immediate needs are just getting predictable Internet connectivity, the sort that proved darned...

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VoIP's Real Security Threat

6/14/2006
Reading about the Asterisk vulnerability that was announced yesterday along with Edwin Pena's $1 million VoIP scam might give one the impression that today's corporate VoIP networks are at serious risk. Nothing could be further from the truth....

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Microsoft's LCS: The New IP PBX?

5/29/2006
Barbara Darrow reports today that Microsoft will finally clarify its plans next month to turn Live Communications Server (LCS) into a next-generation telephony server. Details are to be released at Microsoft's unified communications event in June....

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An Open Letter to Vonage's CEO

5/25/2006
An Open Letter to Mr. Michael F. Snyder, Director and CEO of Vonage Dear Mr. Snyder, Congratulations on your new position, though in the wake of the yesterday's catastrophe of an IPO I'm not sure anybody's going to be envious...

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Republicans: Government Should Censor the Web

5/11/2006
Should the government be restricting the Web sites we surf? Rep. Michael Fitzpatrick thinks so. According to a news report yesterday, he and fellow Republicans want to extend federal laws that will prevent minors from accessing social-networking sites, such as...

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Verizon's Half-Truths About Net Neutrality

5/9/2006
Yesterday, Verizon warned financial service companies that they may not receive Internet connections with the necessary service quality if the government implements Network Neutrality legislation. Pundits have taken this to be a dire warning. Watch out. Evil Verizon is out...

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Juniper and Google: The Kool-Aid Keynotes

5/4/2006
It should have been a great match up. The Interop folk paired Juniper CEO Scott Kriens and Google's enterprise general manager, Dave Girourd, in back-to-back keynotes. Yet as I listened to both speakers I couldn't get over as just how...

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The Dangers of AJAX

4/6/2006
If any technology is closely associated with the Web 2.0 phenomenon it's Asynchronous Javascript and XML aka AJAX. AJAX-based applications are all around us and in theory offer business low-cost alternative to collaborative applications....

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The Alcatel and Lucent Merger: No Cisco Killer Here

4/3/2006
Our industry relishes in looking for the latest Cisco-killer. Usually we're left hypothesizing about Juniper's next move or about Huawei-3Com, but now we've got an even better dark-horse to pin our hopes on ??? the $13 billion Alcatel-Lucent merger....

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Skype Fails and Other Tails of VoIP Woes

3/29/2006
The Registrar is reporting that el Skypo has fixed a problem with its SkypeIn service over in the motherland, the UK. Apparently users complained that the SkypeIn service was down for a week. The outage was particularly frustrating because Skype...

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The Real Competitor for Your VoIP Budget

3/29/2006
Cisco and Avaya may be relishing their newest SIP announcements, but the real 1,000-pound gorilla on the enterprise VoIP landscape isn't on your premises. It's in your network, as in the mobile operator....

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Net Neutrality Nonsense

3/24/2006
For the past few weeks, my partner in crime, Preston Gralla, has bombarded you poor folk with his diatribe on Net Neutrality. He's referred to AT&T and other carriers as running a " Soprano-like business model". He's warned you how...

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A Biz Case for Presence

3/21/2006
One of the most exciting technologies that companies can leverage is presence, understanding the status of other online users, but making the business case for presence has been anything but easy. Stumping for a technology on potential productivity gains within...

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Sudden Impact

3/21/2006
In this podcast, I chat with the leading experts from Avaya, Microsoft, the Burton Group, and the Yankee Group on the impact real-time and non-real time collaboration technologies will have on the enterprise....

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The Preacher of VoIP

3/7/2006
John Chambers electrified the VoiceCon audience here in Orlando in his keynote address that ended 10 minutes ago. The man who VoiceCon co-chair Fred Knight introduced as the "rock star" of our industry walked out to a standing ovation. One...

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It's Time for a Web Services-SIP Standard

3/6/2006
Avaya, Cisco, and Sphere Communications took the first step this week towards VoIP-enabling corporate applications by introducing Web service interfaces to their underlying VoIP servers. Such interfaces enable applications to perform nearly any VoIP functions, such as initiating, answering and...

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Net-Based Mind Reading

3/1/2006
This is a scary. How much can Amazon, Ebay or any e-tailer do to predict your buying habits? More importantly what lessons can you apply to you own e-commerce site to achieve better results?...

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Why I Hate Open Source Routing

3/1/2006
Why is it that perfectly sane, intelligent, and bright journalists get boinked when it comes to open source technology? Mention Firefox and they interpret 10 percent marketshare as market dominance. They sing the praises of Asterisk not stopping to think...

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