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 TitleDate AddedCompany
whitepaper Design, Implementation and Evaluation of a QoS-Aware Transport Protocol2008-06-04 University of New South Wales
  In the context of a reconfigurable transport protocol framework, the paper proposes a QoS-aware Transport Protocol (QSTP), specifically designed to operate over QoS-enabled networks with bandwidth guarantee. QSTP combines QoS-aware TFRC congestion control mechanism, which takes into account the network-level bandwidth reservations, with a Selective ACKnowledgment (SACK) mechanism in order to provide a QoS-aware transport service that fill the gap between QoS enabled network services and QoS constraint applications. The paper has developed a prototype of this protocol in the user-space and conducted a large range of measurements to evaluate this proposal under various network conditions.

Tags: Quality of Service, 		  
whitepaper Top 10 Questions to Ask When Choosing a File Transfer Solution2008-04-14 Biscom
  Transferring, securing, and collaborating on large files and documents in today's enterprise business environment has led users to demand better, more manageable file transfer methods than the traditional FTP, email, and courier services. Responding to these demands, IT departments are looking for secure file transfer solutions that are easy to use for end users, fit into their current IT infrastructure, and can scale to support a growing user population. The goal of this paper is to help people ask the right questions before selecting a Secure File Transfer (SFT) product, as well as providing best practices when implementing and deploying an SFT solution. Secure file transfer, also known as managed file transfer, helps people send electronic files and documents to other people easily.

Tags: File and Network Servers, Network Security		   
whitepaper Linux Virtual Server for Scalable Network Services2008-01-01 Institute of Electrical and Electronics Engineers
  This paper describes the motivation, design, internal implementation of Linux Virtual Server. The goal of Linux Virtual Server is to provide a basic framework to build highly scalable and highly available network services using a large cluster of commodity servers. The TCP/IP stack of Linux kernel is extended to support three IP load balancing techniques, which can make parallel services of different kinds of server clusters to appear as a service on a single IP address. Scalability is achieved by transparently adding or removing a node in the cluster, and high availability is provided by detecting node or daemon failures and reconfiguring the system appropriately.

Tags: Scalability, Linux Server OS		   
whitepaper Tivoli Workload Scheduler for z/OS TCP/IP Connection Support2007-12-24 IBM
  Now one can connect TWS for z/OS components using TCP/IP. This means that the Controller, Tracker, Data Store, and Remote Dialog & PIF no longer need to use SNA (VTAM & APPC) for off SYSPLEX (non-XCF) connections. This TCP/IP support is provided in a Small Programming Enhancement (SPE) for TWS for z/OS version 8.3 as APAR PK40969 (PTFs UK26450, UK26455 & UK26475). This paper describes how to implement the TCP/IP protocol for TWS for z/OS component communications.

Tags: Mainframes		   
whitepaper Evaluating the Use of Spam-Triggered TCP/IP Rate Control to Protect SMTP Servers2007-12-10 Swinburne University of Technology
  This paper examines an approach to spam mitigation that rate limits incoming TCP/IP connections to an SMTP server based on the real-time detection of spam within the SMTP message exchange. Our approach is motivated by a desire to cause increased resource consumption at the spammer end of each SMTP connection, and to avoid the negative impact of false-positives by eventually allowing all emails through. It is called as the tool MT Proxy. MT ProxyĂ­s spam analysis and traffic differentiation characteristic are analyzed to evaluate the efficacy of this architectural approach to fighting spam.   
whitepaper Modeling TCP in a Multi-Rate Multi-User CDMA System2007-12-01 Sprint
  Modern CDMA wireless channels support multiple transmission rates, which can be dynamically assigned to users based on traffic demand. However, in practice, assignment of high rate channels comes with the penalty of increased power as well as smaller orthogonal codes, which constrains their assignment to only a subset of active users. This motivates the need to carefully control high rate channel assignments so as to minimize power and achieve fairness among users. The work discusses in this paper, proposes a simple class of channel allocation policies to achieve this goal for TCP sessions. The paper develops an analytical model that explicitly captures both TCP dynamics and the impact of multiple users contending for a shared resource to evaluate the performance of the allocation policy.

Tags: Mobile - Wireless Communications, TDMA - CDMA		   
whitepaper Cisco Systems IP Network-Centric Video Surveillance2007-12-01 Cisco Systems
  Video surveillance has been a key component of many organization's safety and security group for decades. As an application, video surveillance has demonstrated its value and benefits countless times by providing real-time monitoring of a facility's environment, people, and assets and recording events for subsequent investigation, proof of compliance / audit purposes. As security risks increase, the need to visually monitor and record events in an organization's environment has become even more important. Moreover, the value of video surveillance has grown significantly with the introduction of motion, heat, and sound detection sensors as well as sophisticated video analytics. As a result, many nontraditional groups have also found value in video monitoring and recording.

Tags: Streaming Media, Security Management		   
whitepaper Cisco Unified Communications Manager 6.1 TCP and UDP Port Usage2007-11-19 Cisco Systems
  This paper provides a list of the TCP and UDP ports that Cisco Unified Communications Manager (formerly Cisco Unified CallManager) 6.1 uses for intracluster connections and for communications with external applications or devices. It provides important information for the configuration of firewalls, Access Control Lists (ACLs), and Quality of Service (QoS) on a network when an IP Communications solution is implemented.   
whitepaper Understanding TCP Over TCP: Effects of TCP Tunneling on End-to-End Throughput and Latency2007-11-16 Osaka University
  TCP tunnel is a technology that aggregates and transfers packets sent between end hosts as a single TCP connection. By using a TCP tunnel, the fairness among aggregated flows can be improved and several protocols can be transparently transmitted through a firewall. Currently, many applications such as SSH, VTun, and HTun use a TCP tunnel. However, since most applications running on end hosts generally use TCP, two TCP congestion controls (i.e., end-to-end TCP and tunnel TCP) operate simultaneously and interfere each other. Under certain conditions, it has been known that using a TCP tunnel severely degrades the end-to-end TCP performance. Namely, it has known that using a TCP tunnel drastically degrades the end-to-end TCP throughput for some time, which is called TCP meltdown problem.   
whitepaper Analysis of a Window-Based Flow Control Mechanism Based on TCP Vegas in Heterogeneous Network Environment2007-11-16 Osaka University
  Another version of TCP called TCP Vegas has been proposed and studied in the literature. It can achieve better performance than the current TCP Reno. In the previous studies, steady-state behavior of a window-based flow control mechanism based on TCP Vegas has been analyzed for a simple network topology. This paper extends the analysis to a generic network topology where multiple bottleneck links exist. The paper first derives equilibrium values of a window size of a TCP connection and the number of packets waiting in a router's buffer in steady state. It also derives throughput of each TCP connection in steady state, and investigate the effect of control parameters of TCP Vegas on fairness among TCP connections.