TechRepublic Resources
- Pandora - TCP - COM Bridge (zip)
- Pandora is an Ethernet to RS-232 COM port bridge which allows a user to make an RS-232 COM port available to remote systems on the Ethernet. Pandora can instantiate itself on the host computer as a TCP socket server or client, so there is flexibility in how a remote client...
- Tags: RS-232, TCP, COM, ApexHyperion, Pandora, Telnet, Ethernet, Tcp/Ip, Networking
- Software downloads 2008-05-06
- List open ports and listening services
- As mentioned in the article, "10 security tips for all general-purpose OSes," you should turn off any services you don't actually need so that they will not become avenues of attack for security threats. Ten specific services for Microsoft Windows were mentioned in my later article, "10 services to...
- Tags: Linux Distribution, Network, FreeBSD, TCP, Unix System, Service, Tcp/Ip, UNIX, Operating Systems, Open Source, Linux, Networking, Software, Chad Perrin
- Blog posts 2008-04-15
- Impact of TCP-Like Congestion Control on the Throughput of Multicast Groups
- This paper studies the impact of randomness (i.e. variation of queuing delay due to cross traffic) on the performance of a (one-to-many) multicast session in the presence of a "TCP-like" congestion control mechanism. With a simple analytical model, this paper analyzes the throughput degradation within a multicast (one-to-many) tree under...
- Tags: Congestion, TCP, Sprint Communications, Tcp/Ip, Networking
- White papers
- Congestion Control in Linux TCP
- The TCP protocol is used by the majority of the network applications on the Internet. TCP performance is strongly influenced by its congestion control algorithms that limit the amount of transmitted traffic based on the estimated network capacity and utilization. Because the freely available Linux operating system has gained popularity...
- Tags: Network, Congestion, TCP, TCP Performance, TCP Protocol, Tcp/Ip, Linux, Networking, UNIX, Operating Systems, Open Source, Software
- White papers
- Measuring TCP Over WiFi: A Real Case
- This paper presents a measurement study of an operative WLAN. After briefly presenting the methodology used to generate traffic and measure performance indices, the paper presents results focusing on the performance perceived by TCP connections, to understand the mechanisms which have a major effect on performance. The impact of TCP...
- Tags: Performance, TCP, Wi-Fi, Tcp/Ip, Performance Management, Networking, Human Resources, Workforce Management
- White papers
- Experimental Results on the Support of TCP Over 802.11b: An Insight Into Fairness Issues
- Great attention has been dedicated, in the recent years, to the WLAN standards that are opening the market to the short range and high data rate wireless services in the local and hot spot areas. Technically speaking, the main strength of the most quoted standard, the IEEE 802.11, is the...
- Tags: IEEE 802.11, Attention, WLAN, TCP, Wireless LANs, Tcp/Ip, Wi-Fi, Wireless, LANs, Networking
- White papers
- Transmission Control Protocol
- Transmission Control Protocol (TCP) is a means for building a reliable communications stream on top of the unreliable packet Internet Protocol (IP). TCP is the protocol that supports nearly all Internet applications. The combination of TCP and IP is referred to as TCP/IP and many people imagine, incorrectly, that TCP/IP...
- Tags: TCP, Tcp/Ip, Networking
- White papers
- Practical Experience With TCP Over GPRS
- This paper presents the results of a series of experiments used to characterize the performance of a GPRS (General Packet Radio Service) wireless data network, hence highlighting issues that software architects should consider when designing applications to run over this soon to be widely-deployed service. In summary, it shows that...
- Tags: University Of Cambridge, Network, GPRS, TCP, Tcp/Ip, Cellular Phones, Networking, Consumer Electronics, Personal Technology
- White papers
- Techniques for Improving the Performance of TCP in CDMA Cellular Networks
- This paper surveys various techniques for improving the performance of TCP in CDMA cellular networks. The two major issues that affect the performance of TCP in cellular networks are high packet loss rates due to physical layer impairments in the radio environment, and intermittent connectivity losses due to handoffs. TCP...
- Tags: Technique, Performance, CDMA, TCP, Tcp/Ip, Productivity, Networking
- White papers
- A Queueing Model for HTTP Traffic Over IEEE 802.11 WLANs
- This paper considers an IEEE 802.11 based wireless LAN where an access point is used to connect a fixed number of users to the web or to a shared le system. Users alternate between activity periods (corresponding to the download of a le) and idle periods (corresponding to think times)....
- Tags: IEEE 802.11, HTTP, Computer Science, TCP, Tcp/Ip, Wireless LANs, Wi-Fi, Wireless, Networking
- White papers
- Performance and Implementation of Routing and Wireless Transport Layer Connections in Micro Mobility Ad Hoc Networks
- In mobile ad hoc networks wireless nodes communicate over multi hop links and are capable of movement. This paper evaluates a solution that provides these networks with Internet Access and the capability to roam between different access points. Design and implementation consideration are discussed that focus on behaviour and criterias...
- Tags: Performance, Mobility, TCP, Lund University, Tcp/Ip, Networking, Wi-Fi, Wireless
- White papers
- Micro Mobility and Internet Access Performance for TCP Connections in Ad Hoc Networks
- In ad hoc mobile networks nodes typically communicate over wireless channels and are capable of movement. These are networks that support multihop communication and can be formed on a temporary basis. This paper evaluates a solution that allows mobile nodes to access the wired Internet and roam from base station...
- Tags: Internet Access, Solution, Advertisement, Internet, Mobile, Mobility, TCP, Advertising & Promotion, Marketing
- White papers
- On Inter-Network Handover Performance Using Mobile IPv6
- This paper reports on the practical experiences of using the Mobile IPv6 protocol in an integrated LAN-WLAN-GPRS testbed. Through detailed analysis from packet traces of inter-network (vertical) handovers conducted over the testbed, the performance of transport protocols such as TCP during such handoffs is examined. The considerable differences in link-layer...
- Tags: University Of Cambridge, Performance, Mobile, TCP, Performance Management, Tcp/Ip, Networking, Human Resources, Workforce Management
- White papers
- TCP Over GPRS: The Effect of Preemption
- GPRS extends the widely deployed GSM with a more efficient wireless Internet access. This paper presents measurements of GPRS traffic when preempted circuit-switched calls. The results indicate that TCP performance is degraded more than necessary, as buffered data is flushed immediately when the GPRS traffic is preempted. The required for...
- Tags: GPRS, TCP, Cellular Phones, Tcp/Ip, Consumer Electronics, Personal Technology, Networking
- White papers
- The Impact of Multihop Wireless Channel on TCP Performance
- This paper studies TCP performance in a stationary multihop wireless network using IEEE 802.11 for channel access control. It is shown that given a specific network topology and flow patterns, there exists an optimal window size W at which TCP achieves the highest throughput via maximum spatial reuse of the...
- Tags: Network, TCP, Tcp/Ip, Networking, Wi-Fi, Wireless
- White papers
- Impact of Interference and Capture Effects in 802.11 Wireless Networks on TCP
- As broadband wireless channels become common, the performance of TCP over end-to-end paths containing such links is important. TCP SACK suffers substantially when residual packet error rates increase beyond a value of about 1%-5% (especially for longer RTTs). The authors earlier proposed improvements to TCP (called LT-TCP) to make TCP...
- Tags: IEEE 802.11, Network, TCP, Wireless Network, TCP SACK, Tcp/Ip, Networking, Wireless, Wi-Fi
- White papers
- Sustaining Idle TCP Connections With Linux IP Chains
- In many public forums, such as comp.os.linux.networking (news:comp.os.linux.networking), users of Linux IP Chains complained about masqueraded TCP connections breaking down with no apparent reason after a few minutes of idle time. Since their questions never really have been answered in these forums, the authors of this paper decided to provide...
- Tags: IP, TCP, Forum, Tcp/Ip, Linux, Networking, UNIX, Operating Systems, Open Source, Software
- White papers
- PacketViewer (zip)
- Easy program to sniff and view IP packets (TCP, UDP, ICMP). PacketViewer allows you to view IP packet messages and IP packet information in real time. The button Options opens the PacketViewer options: Protocol Filter, TCP packets Filter, Ports Filter, Resolve IP Addresses (displays host names in real time, but...
- Tags: IP, TCP, UDP, Patrice Zwenger, PacketViewer, Tcp/Ip, Networking
- Software downloads 2008-03-27
- The evolution of UC with Windows Mobile devices
- Much has been written about Microsoft's Unified Communications initiative in terms of Office Communications Server 2007 and Exchange 2007. The "missing link" is the ability for today's mobile devices - handheld PDA phones and smartphones - to integrate with those server products for a total UC experience for end users....
- Tags: Phone, Device, Microsoft Windows Mobile, Mobile, Microsoft Office, TCP, DirectPush, Office Communicator 2007, Office Communicator Client, Advertising & Promotion, Pocket PC, Microsoft Windows, Operating Systems, Handhelds, Marketing, Hardware, Software, Deb Shinder
- Blog posts 2008-02-01
- Use TCPdump for network debugging
- Tcpdump is an extremely useful network packet tracing system. While not as feature-rich as programs such as Wireshark, its packet "dump" output can be used as input by other programs to analyze the dump. In a pinch, and for network debugging, tcpdump works wonders. For instance, if...
- Tags: Network, IP, TCP, Tcpdump, Tcp/Ip, Networking, Network Technology, Vincent Danen
- Blog posts 2008-01-25
