My Netwok Dictionary

Introduction to Netstat

Netstat is a tool to determine the TCP connections are active on the machine where the command is enabled and thus list all the ports TCP and UDP open on the computer.

The command “netstat” also provides statistics on a number of protocols (Ethernet, IPv4, TCP, UDP, ICMP and IPv6). Read the rest of this entry »

“Ping” (short for Packet Internet Groper) is without doubt one of the tools of network administration best known. Yet this is one of the most simple since it allows, through the sending packets to verify if a remote machine responds and, by extension, it is accessible via the network.

The ping tool allows to diagnose network connectivity with a command like:

ping name.of.machine

name.of.machine represents the IP address of the machine or its name. It is usually best at first to test with the IP address of the machine. Read the rest of this entry »

Introduction to Traceroute

Traceroute is a tool for diagnosing networks, present on most operating systems, to determine the path followed by a package. The traceroute command allows to draw a map of the routers between a source machine and target machine. The traceroute command differs between operating systems.

Under the systems UNIX / Linux , the traceroute command is as follows:
traceroute name.of.machine

Under the systems Windows , the traceroute command is as follows:
tracert name.of.machine Read the rest of this entry »

IPerf is a command line program for measuring the performance of networks. JPerf is developed in a Java graphical user interface for IPerf. This guide describes the measurement of the bandwidth of networks by JPerf 2.0.2.

The Java application JPerf runs on Windows, Linux and Apple Mac OS X. For a measurement there are always two networked stations required. As long as both stations are to build an IP connection between the leaves, the type of network is irrelevant. The measurement may be in the local area network (LAN) and over the Internet (ADSL, VDSL, Cable Internet and UMTS) and is also carried out wireless internet access.

JPerf does not for the measurements on the hard disk. The performance of the disk is thus not one in the measurements. In practice, the copying of files over the network that is always slower than the JPerf identified with values.

The free program can be downloaded at Google Code. Read the rest of this entry »

HUB

1. The data sent are sent on all ports to devices that decode the frame header to see if they are the recipients.
2. The total bandwidth is limited to speed hub. A 100 base-T hub provides 100 Mbps of bandwidth shared between all PCs, regardless of the number of ports.
3. Not compatible “half-duplex. A port 100 Mbps allows just one link to 100 Mbps.

SWITCH

1. The data sent from one computer to another are only received by the addressee. If another computer sends data to the printer, they are completely separated; the two communications can be done simultaneously.
2. The bandwidth is determined by the number of ports. i.e., A 100 Mbps 8-Port Switch can handle up to 800 Mbps half duplex, dual full duplex.
3. They are compatible full-duplex, doubling the speed of each port, 100 Mbps to 200 Mbps for Ethernet 100 Base T.

With a small freeware utility TCPView can the current network connections and open ports represent simple. TCPView runs under Windows and was written by Mark Russinovich (Sysinternals).

TCPView use
TCPView can be downloaded from the website Sysinternals. After unpacking the ZIP archive, the program can be started immediately. No installation is required. TCPView shows current use TCP and UDP endports of your system. At each port will use the associated message.

New session will be stored temporarily green, degraded compounds are shown in red briefly. In the last column shows the status of the connection TCPView (Listening, Established in). About the menus can be changed some settings from TCPView. Read the rest of this entry »

Remote PC Access does not get much easier than GoToMyPC. Setup of GoToMyPC takes just 2 minutes. Once your computer is enabled, you can access it at any time from anywhere by logging in to the GoToMyPC website. You can access your office pc or another personal pc just as if you were sitting at your desk and stay connected even though you may be thousands of miles away. You have full control of the computer and all files, programs and network resources available on the machine. Read the rest of this entry »