Subtitles of the Movie

Identify the Network Problem. All of a sudden the browser stops working so you close the web browser and try again. It still doesn't work. Your connection was working so you suspect a network problem. What do you do? Assuming you're on the Fedora 11 GUI Desktop, the first thing to do is to take a look at the Network Icon. If you see a red X on that icon, the No Network Connection Message should appear when you hover over it. Now, that's pretty clear. So the next step is to right click on the icon, make sure that the Enable Networking Option, that checkbox is actually checked. OK, it's checked. The next thing to do is to click on the icon, this time with a left click and see what network devices are available. I could just jump ahead and select a device and it should use the preconfigured settings to try to connect that device, but just in case, let me show you how to go into Troubleshooting Network Devices in more detail and that's most easily done from the Command Line interface. So to open a Command Line interface, I click Applications, System Tools, Terminal and since many of these commands have to be run with administrative privileges, I run the SU command, enter the administrative password. The first thing I would do is run the Ping 127 0.0.1 command. That's the loopback address. If I get a response, that tells me that networking is properly installed and the loopback adapter is operational. To stop all these pings, I press Control C. If the loopback adapter was down, I wouldn't get any response from the Ping command. I press Control C to stop that as well and I bring the loopback adapter back up and I get a good response to my ping. I press Control C again. If that didn't work, my next step would be to take the Fedora Installation DVD or CD and start up Rescue Mode, which I discuss in a different video. Assuming loopback networking works, the next step is to run the IF Config command, which should show available network connections. For the sake of this exercise, I bring down the first Ethernet adapter, Eth 0 with the IF Config Etho Down command, I run the IF Config command again and I see only one adapter available. So I try the IF Config -A command and there it is; that's the first Ethernet adapter, which I can bring up with the IF Config Etho Up command. Once it's up, I focus on that adapter and try to get it an appropriate network address. I can do so with a DH Clad command if it isn't already running. So let me kill the current DH Clad process and use it to get an appropriate network address from an appropriate DHCP server. One's probably already set up for you on perhaps your wireless access point or whatever router you might be using for your home system's connection to the Internet. So I run the IF Config Etho command and that worked. It's given me an IP address so I'm ready for the next step of the process, which is pinging the local address, the IP address of the target network adapter. And I get a good response there. Since I get a good response with that, the next step is to make sure I can ping a remote system. I happen to know that the address of one remote system on my personal network. Yours, of course, will likely different; happens to be that. And that's good because if I didn't receive a response from that ping, then I'd start worrying about wires and cables and all of that. In fact, that's probably the most common cause of network problems; physical connections. Making sure that your Ethernet cables are properly hooked up, perhaps rebooting the wireless or regular routers. If that still doesn't work, my next step would be to check the system with a live CD. You should have done that to begin with before installing Fedora 11 and the live CD check at this point can make sure that everything is still good with the network hardware that you have on your system. Or if you have problems now and have problems with the live CD, the network card may need replacing. Well, those are the basics of network troubleshooting.