Archive of posts with tag 'packets'

Once found mostly in small- and medium-sized business environments, software as a service (SaaS) has now established itself firmly as the preferred solution for new software deployment in the enterprise. Concerns about security and control have been overshadowed by the low entry cost and fast ramp-up of SaaS solutions compared with in-house deployments. Marketing no longer has to wait weeks...

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One of the main use cases for customers of AppNeta is understanding and ensuring that their critical web applications, including SaaS applications, are working well and users are happy with the performance. There are many challenges in making sure business critical SaaS applications are working well: accurately measuring the user experience, understanding how the local network, the wifi and the...

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When verifying that FlowView is identifying flows with the correct application, we use tcpreplay to send traffic from packet capture files into an appliance capture interface. The packet captures can be homemade by us or from our customers. These packet captures are typically recorded without filtering, so naturally they will contain extraneous protocols and many mid-conversation sessions that happened to...

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Depending on your travel agenda, a cross-country flight can be an opportunity to work offline without the usual real-time distractions or catch up on the latest episode of Silicon Valley. With in-flight wireless like Gogo becoming widely available, you may be tempted to keep in touch with colleagues from 35,000 feet, or post to facebook because you can. While connectivity...

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Want to build a packet generator using free software and commodity hardware? Wouldn’t it be nice if that packet generator was just as fast as expensive hardware-based packet generators? What if it was more powerful, flexible and easier to use than commercial alternatives? My blog “Why Test NetFlow with Tcpreplay 4.0” introduced Tcpreplay 4.0 as an alternative to hardware packet generators....

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So you've heard about PathView and FlowView, read some reviews, checked out our website, and you think they sound like they're just the bee's knees (and they are). You've talked to our excellent salesfolk, purchased an appliance and licenses, received your AppNeta login credentials, and now a box has shown up on your doorstep. Your new appliance If you've nabbed yourself...

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This article will be part of a series of articles describing how various network issues are presented by AppNeta Performance Manager. We begin with packet loss. Packet loss occurs when one or more packets failed to reach its intended destination. This article shows how high packet loss is presented on AppNeta. Packet loss also manifests itself by degrading other network metrics...

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Our Systems Engineering team regularly helps customers deploy PathView Cloud to measure end user experience at remote offices. One of PathView’s unique features is the ability to measure actual achievable network capacity.  T1 class WAN services are a popular way to connect branch offices to corporate data centers and the Internet. I say ‘T1’ class because businesses are deploying WAN services that...

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I don’t think I was alone June 21, 2012 when I went to check-in on Twitter during lunch and for some reason could not connect. Hmmm, how is that possible? The Twittersphere can’t actually be down…or can it? My office in Boston was also experiencing some network problems so I just assumed the Twitter issue was related to the Comcast...

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2011 could be considered the year that network performance management “came of age.” In this past year, IT and network managers in organizations of all sizes and industry segments have become aware — if they weren’t already — that the performance of the network is the foundation of user experience and business success. Why was 2011 such a pivotal year...

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Security is a well-known risk with cloud applications, but…what about bandwidth? More and more businesses are looking to cut costs and improve end customer experience by moving customer-facing applications, storage/backup solutions, and many other applications to distributed data centers in the cloud. If users experience performance or latency problems due to insufficient network bandwidth, such as slow, stalling or failed...

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Raise your hand if an end user has complained of a slow file transfer? You can’t tell, but my hand is the highest. File Transfer Protocol (FTP) transfers have been around since the dawn of the civilization.  Not really, but it has been around for the duration of the internet. Point being, the FTP is everywhere. This made me think,...

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The reach and popularity of video conferencing, telepresence and visual collaboration services is exploding, enabling business to happen 24×7 around the world. But, if you’re a consumer or provider of these increasingly business-critical applications, you know they depend entirely on one thing: network performance. IP-based videoconferencing requires high-performance WAN links. This class of applications operates within a narrow Quality of...

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Open source award winner Wireshark is probably the most widely deployed network protocol analyzer/packet sniffer out there. It lets you capture and interactively browse network traffic, and shows the packets to you in a human-readable form. Wireshark is the tool that first made the world of network and application troubleshooting accessible to IT staff. Thanks to the contributions of networking...

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Are you considering moving business-critical applications like e-mail, financial management, backup/recovery and CRM to the cloud? Or maybe you’re already on your way? It’s clear that cloud computing has arrived, and businesses of all sizes are taking advantage of it even faster than initially predicted. Gartner rates it as the top strategic technology for 2011, and surveys from MarketBridge, IBM...

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I spend a good amount of time talking to people about computer networks, their company’s networks, their customers’ networks, telco providers, etc, and the most common question that comes up is “What is using up all my network capacity.” For such a fundamental question this is surprising difficult to answer for the vast majority of companies. Any network engineer worth...

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We are often asked how our technologies very from traditional network management tools. While most other tools rely on simple network management protocol (SNMP), we utilize our own technology to perform ‘active’ network monitoring infrastructure. Around here, we compare SNMP to a car’s dashboard.  You are able to see how much gas is in the tank, what the engine RPMs...

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Our legacy blog entries tell the AppNeta story from the early days…Read on! Much like the ancient mariner in Samuel Taylor Coleridge’s famous poem,  we often find ourselves awash in a sea of packets that tempt that tantalize us with their ability to quench our troubleshooting thirsts – but just like seawater to a thirsty sailor, they’re often too much...

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We like to celebrate our history! Our legacy blog entries tell the AppNeta story from its inception as Apparent Networks. If you’re suffering from slow application performance, chances are you’re suffering from some degree of latency.  As everyone knows, each computer has its own performance limits.  With one too many applications, lag will result from the inability of the computer...

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