Internet Connection Problems

Sometimes the problems caused by unintentional human errors

Sometimes Internet connection problem can be our frustration. Rather than pressing F5-key and  trying to reload the website when we experience a problem, here are some ways we can troubleshoot the problem and identify the cause.
 Ensure we check the physical connections before getting too involved with troubleshooting. Anyone could have accidentally kicked the router or modem’s power cable or pulled an Ethernet cable out of a socket, causing the problem.

Ping

Ping  (wikipedia.org) is a computer network administration utility used to test the reach-ability of a host on an Internet Protocol (IP) network and to measure the round-trip time for messages sent from the originating host to a destination computer.The name comes from active sonar terminology which sends a pulse of sound and listens for the echo to detect objects underwater.
One of the first things to try when our connection doesn’t seem to be working properly is the ping command. Open a Command Prompt window from your "Start button" using the "cmd" command  and type a command like ping google.com . 
 

This command sends several packets to the address you specify.
We can see that everything is working fine.
There’s 0% packet loss and the time each packet takes is fairly low.  

  

Modem & Router Issues

 Sometimes our modems or routers can cause the problem of Internet connection. A modem is a device that communicates with your Internet service provider (ISP), e.g. TOT, while the router shares the connection among all the computers and other networked devices in our home network. In my case (and also other students' cases ) , the modem and the router of mine is the same device, so it is called the "modem-router". Let's take a look at the modem-router. If green lights are flashing on it, that’s normal and indicates network traffic. If we see a steady, blinking orange light, that generally indicates the problem.

All Green Lights Mean Normality

If the lights indicate that either devices are experiencing a problem, try unplugging them and plugging them back in. This is just like restarting our computer. If we still experience problems, we may need to perform a factory reset on your router (to see its manual).

What is about the problem when we are in the classroom? Because the IPaddress conflict can be occurred  anytime, so any computer in the classroom102 can be kicked off easily by the gateway computer of the Media Center which we have to lean on.Our Classroom102

Yes, we cannot connect to the Net directly but always request Internet sharing with the server computer of School Media Center through the local area network.

There are variety kinds of computer in the classroom102, both old and new, big-name and no-name, useable and unusable 

Because any student can log on any computer in our classroom with the administrative account, so he has the full permissions to change/config anything about the network, then any problem can be occurred anytime.